LF356MX/NOPB [TI]
JFET Input Operational Amplifiers;型号: | LF356MX/NOPB |
厂家: | TEXAS INSTRUMENTS |
描述: | JFET Input Operational Amplifiers 放大器 光电二极管 |
文件: | 总32页 (文件大小:2114K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LF155, LF156, LF355, LF356, LF357
www.ti.com
SNOSBH0C –MAY 2000–REVISED MARCH 2013
LF155/LF156/LF256/LF257/LF355/LF356/LF357 JFET Input Operational Amplifiers
Check for Samples: LF155, LF156, LF355, LF356, LF357
1
FEATURES
DESCRIPTION
These are the first monolithic JFET input operational
amplifiers to incorporate well matched, high voltage
JFETs on the same chip with standard bipolar
transistors ( BI-FET™ Technology). These amplifiers
feature low input bias and offset currents/low offset
voltage and offset voltage drift, coupled with offset
adjust which does not degrade drift or common-mode
rejection. The devices are also designed for high slew
rate, wide bandwidth, extremely fast settling time, low
voltage and current noise and a low 1/f noise corner.
23
Advantages
•
•
•
Replace Expensive Hybrid and Module FET Op
Amps
Rugged JFETs Allow Blow-Out Free Handling
Compared with MOSFET Input Devices
Excellent for Low Noise Applications Using
Either High or Low Source Impedance—Very
Low 1/f Corner
•
•
•
Offset Adjust Does Not Degrade Drift or
Common-Mode Rejection as in Most
Monolithic Amplifiers
Common Features
•
•
•
•
•
•
Low Input Bias Current: 30pA
Low Input Offset Current: 3pA
High Input Impedance: 1012Ω
Low Input Noise Current: 0.01 pA/√Hz
High Common-Mode Rejection Ratio: 100 dB
Large DC Voltage Gain: 106 dB
New Output Stage Allows Use of Large
Capacitive Loads (5,000 pF) without Stability
Problems
Internal Compensation and Large Differential
Input Voltage Capability
APPLICATIONS
Table 1. Uncommon Features
•
•
•
•
•
•
•
Precision High Speed Integrators
Fast D/A and A/D Converters
High Impedance Buffers
LF155/ LF156/ LF257/
LF355 LF256/ LF357
LF356 (AV=5)
Units
Extremely fast
settling time to 0.01%
4
1.5
1.5
μs
Wideband, Low Noise, Low Drift Amplifiers
Logarithmic Amplifiers
Fast slew rate
5
12
5
50
20
12
V/µs
MHz
Wide gain bandwidth
2.5
20
Photocell Amplifiers
Low input noise
voltage
12
nV / √Hz
Sample and Hold Circuits
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
3
BI-FET is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2000–2013, Texas Instruments Incorporated
LF155, LF156, LF355, LF356, LF357
SNOSBH0C –MAY 2000–REVISED MARCH 2013
www.ti.com
Simplified Schematic
*3pF in LF357 series.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
2
Submit Documentation Feedback
Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
www.ti.com
SNOSBH0C –MAY 2000–REVISED MARCH 2013
Absolute Maximum Ratings(1)(2)
LF155/6
±22V
LF256/7/LF356B
±22V
LF355/6/7
±18V
Supply Voltage
Differential Input Voltage
±40V
±40V
±30V
(3)
Input Voltage Range
±20V
±20V
±16V
Output Short Circuit Duration
TJMAX
Continuous
Continuous
Continuous
LMC Package
P Package
150°C
115°C
100°C
100°C
115°C
100°C
100°C
D Package
(1) (4)
Power Dissipation at TA = 25°C
LMC Package (Still Air)
LMC Package (400 LF/Min Air Flow)
P Package
560 mW
400 mW
1000 mW
670 mW
380 mW
400 mW
1000 mW
670 mW
380 mW
1200 mW
D Package
Thermal Resistance (Typical) θJA
LMC Package (Still Air)
LMC Package (400 LF/Min Air Flow)
P Package
160°C/W
65°C/W
160°C/W
65°C/W
160°C/W
65°C/W
130°C/W
195°C/W
130°C/W
195°C/W
D Package
(Typical) θJC
LMC Package
23°C/W
23°C/W
23°C/W
Storage Temperature Range
Soldering Information (Lead Temp.)
TO-99 Package
−65°C to +150°C
−65°C to +150°C
−65°C to +150°C
Soldering (10 sec.)
300°C
260°C
300°C
260°C
300°C
260°C
PDIP Package
Soldering (10 sec.)
SOIC Package
Vapor Phase (60 sec.)
Infrared (15 sec.)
215°C
220°C
215°C
220°C
ESD tolerance
(100 pF discharged through 1.5kΩ)
1000V
1000V
1000V
(1) The maximum power dissipation for these devices must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the
ambient temperature, TA. The maximum available power dissipation at any temperature is PD=(TJMAX−TA)/θJA or the 25°C PdMAX
whichever is less.
,
(2) If Military/Aerospace specified devices are required, contact the TI Sales Office/Distributors for availability and specifications.
(3) Unless otherwise specified the absolute maximum negative input voltage is equal to the negative power supply voltage.
(4) Max. Power Dissipation is defined by the package characteristics. Operating the part near the Max. Power Dissipation may cause the
part to operate outside specified limits.
Copyright © 2000–2013, Texas Instruments Incorporated
Submit Documentation Feedback
3
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
SNOSBH0C –MAY 2000–REVISED MARCH 2013
www.ti.com
Units
DC Electrical Characteristics
LF256/7
LF356B
LF155/6
Min Typ
LF355/6/7
Max Min Typ Max
Symbol
VOS
Parameter
Conditions
Max Min Typ
Input Offset Voltage
RS=50Ω, TA=25°C
Over Temperature
RS=50Ω
3
5
7
3
5
3
10
13
mV
mV
6.5
ΔVOS/ΔT
ΔTC/ΔVOS
IOS
Average TC of Input
Offset Voltage
5
5
5
μV/°C
(2)
Change in Average TC
with VOS Adjust
RS=50Ω,
μV/°C
per mV
0.5
3
0.5
3
0.5
3
(1) (3)
Input Offset Current
Input Bias Current
Input Resistance
TJ=25°C,
20
20
20
1
50
2
pA
nA
TJ≤THIGH
(1) (3)
IB
TJ=25°C,
30
100
50
30
100
5
30
200
8
pA
TJ≤THIGH
nA
RIN
TJ=25°C
1012
200
1012
200
1012
200
Ω
AVOL
Large Signal Voltage
Gain
VS=±15V, TA=25°C
VO=±10V, RL=2k
Over Temperature
VS=±15V, RL=10k
VS=±15V, RL=2k
VS=±15V
50
50
25
V/mV
25
25
15
V/mV
VO
Output Voltage Swing
±12
±10
±13
±12
±12
±10
±13
±12
±12
±10
±13
±12
V
V
V
V
VCM
Input Common-Mode
Voltage Range
+15.1
−12
±15.1
−12
+15.1
−12
±11
±11
+10
CMRR
PSRR
Common-Mode
Rejection Ratio
85
85
100
100
85
85
100
100
80
80
100
100
dB
dB
(4)
Supply Voltage Rejection
Ratio
(1) Unless otherwise stated, these test conditions apply:
LF155/156
LF256/257
±15V ≤ VS ≤ ±20V
−25°C ≤ TA ≤ +85°C 0°C ≤ TA ≤ +70°C
LF356B
LF355/6/7
VS= ±15V
Supply Voltage, VS
TA
±15V ≤ VS ≤ ±20V
±15V ≤ VS ±20V
−55°C ≤ TA ≤
0°C ≤ TA ≤ +70°C
+125°C
THIGH
+125°C
+85°C
+70°C
+70°C
and VOS, IB and IOS are measured at VCM = 0.
(2) The Temperature Coefficient of the adjusted input offset voltage changes only a small amount (0.5μV/°C typically) for each mV of
adjustment from its original unadjusted value. Common-mode rejection and open loop voltage gain are also unaffected by offset
adjustment.
(3) The input bias currents are junction leakage currents which approximately double for every 10°C increase in the junction temperature,
TJ. Due to limited production test time, the input bias currents measured are correlated to junction temperature. In normal operation the
junction temperature rises above the ambient temperature as a result of internal power dissipation, Pd. TJ = TA + θJA Pd where θJA is
the thermal resistance from junction to ambient. Use of a heat sink is recommended if input bias current is to be kept to a minimum.
(4) Supply Voltage Rejection is measured for both supply magnitudes increasing or decreasing simultaneously, in accordance with common
practice.
DC Electrical Characteristics
TA = TJ = 25°C, VS = ±15V
LF155
LF355
LF156/256/257/356B
LF356
LF357
Parameter
Units
Typ
Max
Typ
Max
Typ
Max
Typ
Max
Typ
Max
Supply
Current
2
4
2
4
5
7
5
10
5
10
mA
4
Submit Documentation Feedback
Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
www.ti.com
SNOSBH0C –MAY 2000–REVISED MARCH 2013
AC Electrical Characteristics
TA = TJ = 25°C, VS = ±15V
LF155/355
LF156/256/
356B
LF156/256/356/
LF356B
LF257/357
Typ
Symbol
Parameter
Slew Rate
Conditions
Units
Typ
Min
Typ
SR
LF155/6: AV=1,
LF357: AV=5
5
7.5
12
V/μs
V/μs
MHz
μs
50
20
GBW
ts
Gain Bandwidth Product
Settling Time to 0.01%
2.5
4
5
(1)
1.5
1.5
en
Equivalent Input Noise
Voltage
RS=100Ω
f=100 Hz
f=1000 Hz
25
20
15
12
15
12
nV/√Hz
nV/√Hz
pA/√Hz
pA/√Hz
pF
in
Equivalent Input Current f=100 Hz
0.01
0.01
3
0.01
0.01
3
0.01
0.01
3
Noise
f=1000 Hz
CIN
Input Capacitance
(1) Settling time is defined here, for a unity gain inverter connection using 2 kΩ resistors for the LF155/6. It is the time required for the error
voltage (the voltage at the inverting input pin on the amplifier) to settle to within 0.01% of its final value from the time a 10V step input is
applied to the inverter. For the LF357, AV = −5, the feedback resistor from output to input is 2kΩ and the output step is 10V (See Settling
Time Test Circuit).
Copyright © 2000–2013, Texas Instruments Incorporated
Submit Documentation Feedback
5
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
SNOSBH0C –MAY 2000–REVISED MARCH 2013
www.ti.com
Typical DC Performance Characteristics
Curves are for LF155 and LF156 unless otherwise specified.
Input Bias Current
Input Bias Current
Figure 1.
Figure 2.
Input Bias Current
Voltage Swing
Figure 3.
Figure 4.
Supply Current
Supply Current
Figure 5.
Figure 6.
6
Submit Documentation Feedback
Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
www.ti.com
SNOSBH0C –MAY 2000–REVISED MARCH 2013
Typical DC Performance Characteristics (continued)
Curves are for LF155 and LF156 unless otherwise specified.
Negative Current Limit
Positive Current Limit
Figure 7.
Figure 8.
Positive Common-Mode
Input Voltage Limit
Negative Common-Mode
Input Voltage Limit
Figure 9.
Figure 10.
Open Loop Voltage Gain
Output Voltage Swing
Figure 11.
Figure 12.
Copyright © 2000–2013, Texas Instruments Incorporated
Submit Documentation Feedback
7
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
SNOSBH0C –MAY 2000–REVISED MARCH 2013
www.ti.com
Typical AC Performance Characteristics
Gain Bandwidth
Gain Bandwidth
Figure 13.
Figure 14.
Normalized Slew Rate
Output Impedance
Figure 15.
Figure 16.
Output Impedance
Figure 17.
8
Submit Documentation Feedback
Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
www.ti.com
SNOSBH0C –MAY 2000–REVISED MARCH 2013
Typical AC Performance Characteristics (continued)
LF155 Small Signal Pulse Response, AV = +1
LF156 Small Signal Pulse Response, AV = +1
Figure 18.
Figure 19.
LF156 Large Signal Puls
Response, AV = +1
LF155 Large Signal Pulse Response, AV = +1
Figure 20.
Figure 21.
Inverter Settling Time
Inverter Settling Time
Figure 22.
Figure 23.
Copyright © 2000–2013, Texas Instruments Incorporated
Submit Documentation Feedback
9
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
SNOSBH0C –MAY 2000–REVISED MARCH 2013
www.ti.com
Typical AC Performance Characteristics (continued)
Open Loop Frequency Response
Bode Plot
Figure 24.
Bode Plot
Figure 25.
Bode Plot
Figure 26.
Figure 27.
Common-Mode Rejection Ratio
Power Supply Rejection Ratio
Figure 28.
Figure 29.
10
Submit Documentation Feedback
Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
www.ti.com
SNOSBH0C –MAY 2000–REVISED MARCH 2013
Typical AC Performance Characteristics (continued)
Power Supply Rejection Ratio
Undistorted Output Voltage Swing
Figure 30.
Figure 31.
Equivalent Input Noise
Voltage (Expanded Scale)
Equivalent Input Noise Voltage
Figure 32.
Figure 33.
Copyright © 2000–2013, Texas Instruments Incorporated
Submit Documentation Feedback
11
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
SNOSBH0C –MAY 2000–REVISED MARCH 2013
www.ti.com
DETAILED SCHEMATIC
*C = 3pF in LF357 series.
Connection Diagrams
(Top Views)
*Available per JM38510/11401 or
JM38510/11402
Figure 34. TO-99 Package (LMC)
See Package Number LMC (O-MBCY-W8)
Figure 35. SOIC and PDIP Package (D and P)
See Package Number
D (R-PDSO-G8) or P (R-PDIP-T8)
12
Submit Documentation Feedback
Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
www.ti.com
SNOSBH0C –MAY 2000–REVISED MARCH 2013
APPLICATION HINTS
These are op amps with JFET input devices. These JFETs have large reverse breakdown voltages from gate to
source and drain eliminating the need for clamps across the inputs. Therefore large differential input voltages can
easily be accommodated without a large increase in input current. The maximum differential input voltage is
independent of the supply voltages. However, neither of the input voltages should be allowed to exceed the
negative supply as this will cause large currents to flow which can result in a destroyed unit.
Exceeding the negative common-mode limit on either input will force the output to a high state, potentially
causing a reversal of phase to the output. Exceeding the negative common-mode limit on both inputs will force
the amplifier output to a high state. In neither case does a latch occur since raising the input back within the
common-mode range again puts the input stage and thus the amplifier in a normal operating mode.
Exceeding the positive common-mode limit on a single input will not change the phase of the output however, if
both inputs exceed the limit, the output of the amplifier will be forced to a high state.
These amplifiers will operate with the common-mode input voltage equal to the positive supply. In fact, the
common-mode voltage can exceed the positive supply by approximately 100 mV independent of supply voltage
and over the full operating temperature range. The positive supply can therefore be used as a reference on an
input as, for example, in a supply current monitor and/or limiter.
Precautions should be taken to ensure that the power supply for the integrated circuit never becomes reversed in
polarity or that the unit is not inadvertently installed backwards in a socket as an unlimited current surge through
the resulting forward diode within the IC could cause fusing of the internal conductors and result in a destroyed
unit.
All of the bias currents in these amplifiers are set by FET current sources. The drain currents for the amplifiers
are therefore essentially independent of supply voltage.
As with most amplifiers, care should be taken with lead dress, component placement and supply decoupling in
order to ensure stability. For example, resistors from the output to an input should be placed with the body close
to the input to minimize “pickup” and maximize the frequency of the feedback pole by minimizing the capacitance
from the input to ground.
A feedback pole is created when the feedback around any amplifier is resistive. The parallel resistance and
capacitance from the input of the device (usually the inverting input) to AC ground set the frequency of the pole.
In many instances the frequency of this pole is much greater than the expected 3dB frequency of the closed loop
gain and consequently there is negligible effect on stability margin. However, if the feedback pole is less than
approximately six times the expected 3 dB frequency a lead capacitor should be placed from the output to the
input of the op amp. The value of the added capacitor should be such that the RC time constant of this capacitor
and the resistance it parallels is greater than or equal to the original feedback pole time constant.
Typical Circuit Connections
Figure 36. VOS Adjustment
•
•
•
VOS is adjusted with a 25k potentiometer
The potentiometer wiper is connected to V+
For potentiometers with temperature coefficient of 100 ppm/°C or less the additional drift with adjust is ≈
0.5μV/°C/mV of adjustment
•
Typical overall drift: 5μV/°C ±(0.5μV/°C/mV of adj.)
Copyright © 2000–2013, Texas Instruments Incorporated
Submit Documentation Feedback
13
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
SNOSBH0C –MAY 2000–REVISED MARCH 2013
www.ti.com
*LF155/6 R = 5k, LF357 R = 1.25k
Figure 37. Driving Capacitive Loads
Due to a unique output stage design, these amplifiers have the ability to drive large capacitive loads and still
maintain stability. CL(MAX) ≃ 0.01μF.
Overshoot ≤ 20%, Settling time (ts) ≃ 5μs
For distortion ≤ 1% and a 20 Vp-p VOUT swing, power bandwidth is: 500kHz.
Figure 38. LF357 - A Large Power BW Amplifier
Typical Applications
Figure 39. Settling Time Test Circuit
•
•
•
•
Settling time is tested with the LF155/6 connected as unity gain inverter and LF357 connected for AV = −5
FET used to isolate the probe capacitance
Output = 10V step
AV = −5 for LF357
14
Submit Documentation Feedback
Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
www.ti.com
SNOSBH0C –MAY 2000–REVISED MARCH 2013
Large Signal Inverter Output, VOUT (from Settling Time Circuit)
Figure 40. LF355
Figure 41. LF356
Copyright © 2000–2013, Texas Instruments Incorporated
Submit Documentation Feedback
15
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
SNOSBH0C –MAY 2000–REVISED MARCH 2013
www.ti.com
Figure 42. LF357
Figure 43. Low Drift Adjustable Voltage Reference
•
•
•
•
•
Δ VOUT/ΔT = ±0.002%/°C
All resistors and potentiometers should be wire-wound
P1: drift adjust
P2: VOUT adjust
Use LF155 for
–
–
–
Low IB
Low drift
Low supply current
16
Submit Documentation Feedback
Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
www.ti.com
SNOSBH0C –MAY 2000–REVISED MARCH 2013
Figure 44. Fast Logarithmic Converter
•
•
•
•
•
Dynamic range: 100μA ≤ Ii ≤ 1mA (5 decades), |VO| = 1V/decade
Transient response: 3μs for ΔIi = 1 decade
C1, C2, R2, R3: added dynamic compensation
VOS adjust the LF156 to minimize quiescent error
RT: Tel Labs type Q81 + 0.3%/°C
Figure 45. Precision Current Monitor
•
•
•
VO = 5 R1/R2 (V/mA of IS)
R1, R2, R3: 0.1% resistors
Use LF155 for
–
–
–
–
Common-mode range to supply range
Low IB
Low VOS
Low Supply Current
Copyright © 2000–2013, Texas Instruments Incorporated
Submit Documentation Feedback
17
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
SNOSBH0C –MAY 2000–REVISED MARCH 2013
www.ti.com
Figure 46. 8-Bit D/A Converter with Symmetrical Offset Binary Operation
R1, R2 should be matched within ±0.05%
Full-scale response time: 3μs
•
•
EO
B1
1
B2
1
B3
1
B4
1
B5
1
B6
1
B7
1
B8
1
Comments
Positive Full-Scale
(+) Zero-Scale
+9.920
+0.040
−0.040
−9.920
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
(−) Zero-Scale
0
0
0
0
0
0
0
0
Negative Full-Scale
Figure 47. Wide BW Low Noise, Low Drift Amplifier
•
Parasitic input capacitance C1 ≃ (3pF for LF155, LF156 and LF357 plus any additional layout capacitance)
interacts with feedback elements and creates undesirable high frequency pole. To compensate add C2 such
that: R2 C2 ≃ R1 C1.
Figure 48. Boosting the LF156 with a Current Amplifier
•
IOUT(MAX)≃150mA (will drive RL≥ 100Ω)
•
•
No additional phase shift added by the current amplifier
18
Submit Documentation Feedback
Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
www.ti.com
SNOSBH0C –MAY 2000–REVISED MARCH 2013
R1, R4 matched. Linearity 0.1% over 2 decades.
Figure 49. Decades VCO
Figure 50. Isolating Large Capacitive Loads
•
•
•
Overshoot 6%
ts 10μs
When driving large CL, the VOUT slew rate determined by CL and IOUT(MAX)
:
Figure 51. Low Drift Peak Detector
•
•
•
•
By adding D1 and Rf, VD1=0 during hold mode. Leakage of D2 provided by feedback path through Rf.
Leakage of circuit is essentially Ib (LF155, LF156) plus capacitor leakage of Cp.
Diode D3 clamps VOUT (A1) to VIN−VD3 to improve speed and to limit reverse bias of D2.
Maximum input frequency should be << ½πRfCD2 where CD2 is the shunt capacitance of D2.
Copyright © 2000–2013, Texas Instruments Incorporated
Submit Documentation Feedback
19
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
SNOSBH0C –MAY 2000–REVISED MARCH 2013
www.ti.com
Figure 52. Non-Inverting Unity Gain Operation for LF157
Figure 53. Inverting Unity Gain for LF157
20
Submit Documentation Feedback
Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
www.ti.com
SNOSBH0C –MAY 2000–REVISED MARCH 2013
Figure 54. High Impedance, Low Drift Instrumentation Amplifier
System VOS adjusted via A2 VOS adjust
Trim R3 to boost up CMRR to 120 dB. Instrumentation amplifier resistor array recommended for best
accuracy and lowest drift
•
•
Copyright © 2000–2013, Texas Instruments Incorporated
Submit Documentation Feedback
21
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
SNOSBH0C –MAY 2000–REVISED MARCH 2013
www.ti.com
Figure 55. Fast Sample and Hold
Both amplifiers (A1, A2) have feedback loops individually closed with stable responses (overshoot negligible)
•
•
Acquisition time TA, estimated by:
•
•
•
LF156 develops full Sr output capability for VIN ≥ 1V
Addition of SW2 improves accuracy by putting the voltage drop across SW1 inside the feedback loop
Overall accuracy of system determined by the accuracy of both amplifiers, A1 and A2
Figure 56. High Accuracy Sample and Hold
•
•
By closing the loop through A2, the VOUT accuracy will be determined uniquely by A1.
–
No VOS adjust required for A2.
TA can be estimated by same considerations as previously but, because of the added
propagation delay in the feedback loop (A2) the overshoot is not negligible.
–
•
•
•
Overall system slower than fast sample and hold
R1, CC: additional compensation
Use LF156 for
–
–
Fast settling time
Low VOS
22
Submit Documentation Feedback
Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
www.ti.com
SNOSBH0C –MAY 2000–REVISED MARCH 2013
Figure 57. High Q Band Pass Filter
•
•
•
By adding positive feedback (R2)
Q increases to 40
fBP = 100 kHz
•
•
Clean layout recommended
Response to a 1Vp-p tone burst: 300μs
Figure 58. High Q Notch Filter
•
2R1 = R = 10MΩ
2C = C1 = 300pF
–
•
•
•
Capacitors should be matched to obtain high Q
fNOTCH = 120 Hz, notch = −55 dB, Q > 100
Use LF155 for
–
–
Low IB
Low supply current
Copyright © 2000–2013, Texas Instruments Incorporated
Submit Documentation Feedback
23
Product Folder Links: LF155 LF156 LF355 LF356 LF357
LF155, LF156, LF355, LF356, LF357
SNOSBH0C –MAY 2000–REVISED MARCH 2013
www.ti.com
REVISION HISTORY
Changes from Revision B (March 2013) to Revision C
Page
•
Changed layout of National Data Sheet to TI format .......................................................................................................... 23
24
Submit Documentation Feedback
Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LF155 LF156 LF355 LF356 LF357
PACKAGE OPTION ADDENDUM
www.ti.com
1-Nov-2013
PACKAGING INFORMATION
Orderable Device
Status Package Type Package Pins Package
Eco Plan
Lead/Ball Finish
MSL Peak Temp
Op Temp (°C)
Device Marking
Samples
Drawing
Qty
(1)
(2)
(6)
(3)
(4/5)
LF156H
ACTIVE
TO-99
TO-99
LMC
8
8
500
TBD
Call TI
Call TI
-55 to 125
-55 to 125
LF156H
LF156H/NOPB
ACTIVE
LMC
500
Green (RoHS
& no Sb/Br)
POST-PLATE
Level-1-NA-UNLIM
LF156H
LF256H
ACTIVE
ACTIVE
TO-99
TO-99
LMC
LMC
8
8
500
500
TBD
Call TI
Call TI
-25 to 85
-25 to 85
LF256H
LF256H
LF256H/NOPB
Green (RoHS
& no Sb/Br)
POST-PLATE
Level-1-NA-UNLIM
LF356H
ACTIVE
ACTIVE
TO-99
TO-99
LMC
LMC
8
8
500
500
TBD
Call TI
Call TI
0 to 70
0 to 70
LF356H
LF356H
LF356H/NOPB
Green (RoHS
& no Sb/Br)
POST-PLATE
Level-1-NA-UNLIM
LF356M
LF356M/NOPB
LF356MX
NRND
ACTIVE
NRND
SOIC
SOIC
SOIC
SOIC
PDIP
PDIP
D
D
D
D
P
P
8
8
8
8
8
8
95
95
TBD
Call TI
SN | CU SN
Call TI
Call TI
Level-1-260C-UNLIM
Call TI
0 to 70
0 to 70
0 to 70
0 to 70
0 to 70
0 to 70
LF356
M
Green (RoHS
& no Sb/Br)
LF356
M
2500
2500
40
TBD
LF356
M
LF356MX/NOPB
LF356N
ACTIVE
NRND
Green (RoHS
& no Sb/Br)
SN | CU SN
Call TI
Level-1-260C-UNLIM
Call TI
LF356
M
TBD
LF
356N
LF356N/NOPB
ACTIVE
40
Green (RoHS
& no Sb/Br)
CU SN
Level-1-NA-UNLIM
LF
356N
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
1-Nov-2013
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
11-Oct-2013
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
B0
K0
P1
W
Pin1
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
LF356MX
SOIC
SOIC
D
D
8
8
2500
2500
330.0
330.0
12.4
12.4
6.5
6.5
5.4
5.4
2.0
2.0
8.0
8.0
12.0
12.0
Q1
Q1
LF356MX/NOPB
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
11-Oct-2013
*All dimensions are nominal
Device
Package Type Package Drawing Pins
SPQ
Length (mm) Width (mm) Height (mm)
LF356MX
SOIC
SOIC
D
D
8
8
2500
2500
367.0
367.0
367.0
367.0
35.0
35.0
LF356MX/NOPB
Pack Materials-Page 2
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other
changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest
issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and
complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale
supplied at the time of order acknowledgment.
TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms
and conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent TI deems necessary
to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily
performed.
TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and
applications using TI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or
other intellectual property right relating to any combination, machine, or process in which TI components or services are used. Information
published by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty or
endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the
third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration
and is accompanied by all associated warranties, conditions, limitations, and notices. TI is not responsible or liable for such altered
documentation. Information of third parties may be subject to additional restrictions.
Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or service
voids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice.
TI is not responsible or liable for any such statements.
Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirements
concerning its products, and any use of TI components in its applications, notwithstanding any applications-related information or support
that may be provided by TI. Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which
anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause
harm and take appropriate remedial actions. Buyer will fully indemnify TI and its representatives against any damages arising out of the use
of any TI components in safety-critical applications.
In some cases, TI components may be promoted specifically to facilitate safety-related applications. With such components, TI’s goal is to
help enable customers to design and create their own end-product solutions that meet applicable functional safety standards and
requirements. Nonetheless, such components are subject to these terms.
No TI components are authorized for use in FDA Class III (or similar life-critical medical equipment) unless authorized officers of the parties
have executed a special agreement specifically governing such use.
Only those TI components which TI has specifically designated as military grade or “enhanced plastic” are designed and intended for use in
military/aerospace applications or environments. Buyer acknowledges and agrees that any military or aerospace use of TI components
which have not been so designated is solely at the Buyer's risk, and that Buyer is solely responsible for compliance with all legal and
regulatory requirements in connection with such use.
TI has specifically designated certain components as meeting ISO/TS16949 requirements, mainly for automotive use. In any case of use of
non-designated products, TI will not be responsible for any failure to meet ISO/TS16949.
Products
Applications
Audio
www.ti.com/audio
amplifier.ti.com
dataconverter.ti.com
www.dlp.com
Automotive and Transportation www.ti.com/automotive
Communications and Telecom www.ti.com/communications
Amplifiers
Data Converters
DLP® Products
DSP
Computers and Peripherals
Consumer Electronics
Energy and Lighting
Industrial
www.ti.com/computers
www.ti.com/consumer-apps
www.ti.com/energy
dsp.ti.com
Clocks and Timers
Interface
www.ti.com/clocks
interface.ti.com
logic.ti.com
www.ti.com/industrial
www.ti.com/medical
Medical
Logic
Security
www.ti.com/security
Power Mgmt
Microcontrollers
RFID
power.ti.com
Space, Avionics and Defense
Video and Imaging
www.ti.com/space-avionics-defense
www.ti.com/video
microcontroller.ti.com
www.ti-rfid.com
www.ti.com/omap
OMAP Applications Processors
Wireless Connectivity
TI E2E Community
e2e.ti.com
www.ti.com/wirelessconnectivity
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2013, Texas Instruments Incorporated
相关型号:
SI9130DB
5- and 3.3-V Step-Down Synchronous ConvertersWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135LG-T1
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135LG-T1-E3
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135_11
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9136_11
Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130CG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130LG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130_11
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137DB
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137LG
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9122E
500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification DriversWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
©2020 ICPDF网 联系我们和版权申明