LT1639CS#TRPBF [Linear]
LT1639 - 1.2MHz, 0.4V/us Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps; Package: SO; Pins: 14; Temperature Range: 0°C to 70°C;型号: | LT1639CS#TRPBF |
厂家: | Linear |
描述: | LT1639 - 1.2MHz, 0.4V/us Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps; Package: SO; Pins: 14; Temperature Range: 0°C to 70°C 运算放大器 |
文件: | 总12页 (文件大小:326K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT1638/LT1639
1.2MHz, 0.4V/µs
Over-The-TopTM Micropower
Rail-to-Rail Input and Output
Op Amps
U
FEATURES
DESCRIPTION
The LT®1638 is a low power dual rail-to-rail input and output
operationalamplifieravailableinthestandard8-pinPDIPand
SO packages as well as the 8-lead MSOP package. The
LT1639 is a low power quad rail-to-rail input and output
operational amplifier offered on the standard 14-pin PDIP
and surface mount packages.
Operates with Inputs Above V+
■
■
Rail-to-Rail Input and Output
Low Power: 230µA per Amplifier Max
■
■
■
■
■
■
■
■
■
■
■
Gain Bandwidth Product: 1.2MHz
Slew Rate: 0.4V/µs
High Output Current: 25mA Min
Specified on 3V, 5V and ±15V Supplies
Reverse Battery Protection to 18V
No Supply Sequencing Problems
High Voltage Gain: 1500V/mV
Single Supply Input Range: –0.4V to 44V
High CMRR: 98dB
The LT1638/LT1639 op amps operate on all single and
split supplies with a total voltage of 2.5V to 44V drawing
only 170µA of quiescent current per amplifier. These
amplifiers are reverse battery protected and draw no
current for reverse supply up to 18V.
The input range of the LT1638/LT1639 includes both
supplies,andauniquefeatureofthisdeviceisitscapability
to operate over the top with either or both of its inputs
above V+. The inputs handle 44V, both differential and
common mode, independent of supply voltage. The input
stage incorporates phase reversal protection to prevent
falseoutputsfromoccurringevenwhentheinputsare22V
below the negative supply. Protective resistors are
included in the input leads so that current does not
become excessive when the inputs are forced below the
negativesupply.TheLT1638/LT1639candriveloadsupto
25mAandstillmaintainrail-to-railcapability.Theopamps
are unity-gain stable and drive all capacitive loads up to
1000pF when optional output compensation is used.
No Phase Reversal
U
APPLICATIONS
■
Battery- or Solar-Powered Systems
Portable Instrumentation
Sensor Conditioning
■
Supply Current Sensing
■
Battery Monitoring
Micropower Active Filters
4mA to 20mA Transmitters
■
■
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top is a trademark of Linear Technology Corporation.
U
TYPICAL APPLICATION
Output Voltage vs Input Voltage
Over-The-Top Comparator with 100mV Hysteresis Centered at 0mV
5V
0V
V
CC
10k
1M
V1
V
CC
V
CC
1M
+
+
A
B
V0
1/2 LT1638
1/2 LT1638
1M
–
–
10k
1M
1638/39 TA01
V2
1638/39 TA02
V
= 5V, V
= 0V TO 44V, t = 27µs
CM PD
CC
1
LT1638/LT1639
W W
U W
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage (V+ to V–) .............................. 44V
Input Differential Voltage ......................................... 44V
Input Current ...................................................... ±25mA
Output Short-Circuit Duration (Note 2) .........Continuous
Operating Temperature Range ................ –40°C to 85°C
Specified Temperature Range (Note 3) .. –40°C to 85°C
Junction Temperature........................................... 150°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
U
W U
PACKAGE/ORDER INFORMATION
TOP VIEW
TOP VIEW
TOP VIEW
+
OUT A
–IN A
+IN A
1
2
3
4
5
6
7
14 OUT D
13 –IN D
1
2
3
4
8
7
6
5
OUT A
–IN A
+IN A
V
OUT A
–IN A
+IN A
1
2
3
4
8 V+
OUT B
–IN B
+IN B
7 OUT B
6 –IN B
5 +IN B
A
B
D
C
A
12 +IN D
–
–
V
+
B
V
11
V
–
V
MS8 PACKAGE
8-LEAD PLASTIC MSOP
+IN B
–IN B
OUT B
10 +IN C
S8 PACKAGE
8-LEAD PLASTIC SO
N8 PACKAGE
8-LEAD PDIP
9
8
– IN C
OUT C
TJMAX = 150°C, θJA = 250°C/ W (MS8)
TJMAX = 150°C, θJA = 130°C/ W (N8)
JMAX = 150°C, θJA = 190°C/ W (S8)
T
N PACKAGE
S PACKAGE
14-LEAD PDIP 14-LEAD PLASTIC SO
ORDER PART NUMBER
LT1638CMS8
ORDER PART NUMBER
TJMAX = 150°C, θJA = 110°C/ W (N)
T
JMAX = 150°C, θJA = 150°C/ W (S)
LT1638CN8
LT1638CS8
LT1638IS8
LT1638IN8
ORDER PART NUMBER
MS8 PART MARKING
S8 PART MARKING
LT1639CN
LT1639IN
LT1639CS
LT1639IS
1638
1638I
LTCY
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply, TA = 25°C, unless otherwise noted. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
LT1638 N, S Packages
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
200
600
850
950
µV
µV
µV
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
LT1639 N, S Packages
300
350
700
950
µV
µV
µV
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
1050
A
LT1638C MS8 Package
900
1150
1250
µV
µV
µV
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Input Offset Voltage Drift
(Note 7)
LT1638/LT1639 N, S Packages
LT1638CMS8
●
●
2
2.5
6
7
µV/°C
µV/°C
I
Input Offset Current
●
●
1
6
2.5
nA
µA
OS
V
= 44V (Note 4)
CM
2
LT1638/LT1639
ELECTRICAL CHARACTERISTICS
VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply, TA = 25°C, unless otherwise noted. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
Input Bias Current
●
●
20
8
0.1
50
30
nA
µA
nA
B
V
S
= 44V (Note 4)
CM
V = 0V
Input Noise Voltage
0.1Hz to 10Hz
f = 1kHz
1
µV
P-P
e
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
20
0.3
nV/√Hz
pA/√Hz
n
i
f = 1kHz
n
R
Differential
Common Mode, V = 0V to 44V
1
1.4
2.5
5.5
MΩ
MΩ
IN
CM
C
Input Capacitance
5
pF
V
IN
Input Voltage Range
●
0
44
CMRR
Common Mode Rejection Ratio
V
CM
V
CM
= 0V to V – 1V
●
●
88
80
98
88
dB
dB
CC
= 0V to 44V (Note 8)
A
Large-Signal Voltage Gain
V = 3V, V = 500mV to 2.5V, R = 10k
200
133
100
1500
V/mV
V/mV
V/mV
VOL
S
O
L
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V = 5V, V = 500mV to 4.5V, R = 10k
400
250
200
1500
V/mV
V/mV
V/mV
S
O
L
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V
V
Output Voltage Swing Low
Output Voltage Swing High
Short-Circuit Current (Note 2)
V = 3V, No Load
●
●
3
8
mV
mV
OL
OH
S
V = 3V, I
= 5mA
250
450
S
SINK
V = 5V, No Load
●
●
3
500
8
700
mV
mV
S
V = 5V, I
S
= 10mA
SINK
V = 3V, No Load
●
●
2.94
2.25
2.98
2.40
V
V
S
V = 3V, I
= 5mA
S
SOURCE
V = 5V, No Load
●
●
4.94
3.8
4.98
4.0
V
V
S
V = 5V, I
S
= 10mA
SOURCE
I
V = 3V, Short to GND
10
15
15
25
mA
mA
SC
S
V = 3V, Short to V
S
CC
V = 5V, Short to GND
15
15
20
25
mA
mA
S
V = 5V, Short to V
S
CC
PSRR
Power Supply Rejection Ratio
Reverse Supply Voltage
V = 3V to 12.5V, V = V = 1V
●
●
●
90
18
100
27
dB
V
S
CM
O
I = –100µA per Amplifier
S
Minimum Operating Supply Voltage
2.4
170
2.7
V
I
Supply Current per Amplifier
(Note 5)
230
275
µA
µA
S
●
GBW
SR
Gain Bandwidth Product
(Note 4)
f = 1kHz
650
550
500
1075
0.38
kHz
kHz
kHz
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Slew Rate
(Note 6)
A = –1, R = ∞
0.210
0.185
0.170
V/µs
V/µs
V/µs
V
L
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
3
LT1638/LT1639
ELECTRICAL CHARACTERISTICS VS =
±15V, VCM = 0V, VOUT = 0V, TA = 25°C, unless otherwise noted. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
LT1638 N, S Packages
250
800
1000
1100
µV
µV
µV
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
LT1639 N, S Packages
350
400
900
1100
1200
µV
µV
µV
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
LT1638C MS8 Package
1050
1250
1350
µV
µV
µV
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Input Offset Voltage Drift
(Note 7)
LT1638/LT1639 N, S Packages
LT1638CMS8
●
●
2
2.5
6
7
µV/°C
µV/°C
I
I
Input Offset Current
Input Bias Current
●
●
1
20
1
6
nA
nA
OS
50
B
Input Noise Voltage
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
0.1Hz to 10Hz
f = 1kHz
µV
P-P
e
20
0.3
nV/√Hz
pA/√Hz
n
i
n
f = 1kHz
R
Differential
Common Mode, V = –15V to 14V
1
2.5
500
MΩ
MΩ
IN
CM
C
Input Capacitance
4.5
pF
V
IN
Input Voltage Range
●
●
–15
80
29
CMRR
Common Mode Rejection Ratio
Large-Signal Voltage Gain
V
= –15V to 29V
88
dB
CM
A
VOL
V = ±14V, R = 10k
200
125
100
500
V/mV
V/mV
V/mV
O
L
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V
OL
Output Voltage Swing
No Load
●
●
14.9
13.7
14.95
14.0
V
V
I
= ±10mA
OUT
I
Short-Circuit Current (Note 2)
Short to GND
0°C ≤ T ≤ 70°C
25
20
15
40
mA
mA
mA
SC
●
●
A
–40°C ≤ T ≤ 85°C
A
PSRR
Power Supply Rejection Ratio
Supply Current per Amplifier
V = ±1.5V to ±22V
S
●
90
100
205
dB
I
280
350
µA
µA
S
●
GBW
SR
Gain Bandwidth Product
Slew Rate
f = 1kHz
750
650
600
1200
0.4
kHz
kHz
kHz
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
A = –1, R = ∞, V = ±10V,
0.225
0.2
0.18
V/µs
V/µs
V/µs
V
L
O
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Note 4: V = 5V limits are guaranteed by correlation to V = 3V and
The
● denotes specifications which apply over the full specified
S
S
V = ±15V tests.
S
temperature range.
Note 5: V = 3V limits are guaranteed by correlation to V = 5V and
Note 1: Absolute Maximum Ratings are those values beyond which the
S
S
V = ±15V tests.
S
life of a device may be impaired.
Note 6: Guaranteed by correlation to slew rate at V = ±15V and GBW
Note 2: A heat sink may be required to keep the junction temperature
below absolute maximum. This depends on the power supply voltage
and how many amplifiers are shorted.
Note 3: The LT1638C/LT1639C are guaranteed to meet 0°C to 70°C
specifications and are designed, characterized and expected to meet
the extended temperature limits, but are not tested at –40°C and 85°C.
The LT1638I/LT1639I are guaranteed to meet the extended
temperature limits.
S
at V = 3V and V = ±15V tests.
S
S
Note 7: This parameter is not 100% tested.
Note 8: The spec implies a typical offset voltage at V = 44 of 2mV and
CM
a maximum offset voltage at V = 44 of 5mV.
CM
4
LT1638/LT1639
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Input Bias Current vs
Common Mode Voltage
Supply Current vs Supply Voltage
Minimum Supply Voltage
400
300
300
280
260
240
220
200
180
160
140
120
100
10000
8000
6000
V
= 5V, 0V
S
T
= 125°C
A
200
100
T
= 25°C
A
T
= –55°C
A
60
40
0
T
= 25°C
A
–100
T
A
= –55°C
20
T
= –55°C
T
= 125°C
T
A
= 125°C
A
A
–200
–300
T
= 25°C
0
A
–20
–40
–400
0
1
2
3
4
5
0
5
10 15 20 25 30 35 40 45
SUPPLY VOLTAGE (V)
4.0
4.4
5.2
5.6
44
4.8
TOTAL SUPPLY VOLTAGE (V)
COMMON MODE VOLTAGE (V)
1638/39 G02
1638/39 G01
1638/39 G03
Output Saturation Voltage vs
Load Current (Output High)
Output Saturation Voltage vs
Load Current (Output Low)
Output Saturation Voltage vs
Input Overdrive
1
1
100
10
1
V
= ±2.5V
V
V
= ±2.5V
OD
V
V
= ±2.5V
OD
S
S
S
NO LOAD
= 30mV
= 30mV
T
A
= 125°C
OUTPUT HIGH
0.1
T
= 125°C
A
T
A
= 25°C
T
A
= 25°C
0.1
0.01
OUTPUT LOW
T
A
= –55°C
T
= –55°C
A
0.01
0.001
0.001
0.01
0.1
1
10
10 20
40
60 70 80 100
90
0.001
0.01
0.1
1
10
0
30
50
SOURCING LOAD CURRENT (mA)
SINKING LOAD CURRENT (mA)
INPUT OVERDRIVE (mV)
1638/39 G04
1638/39 G06
1638/39 G05
Noise Voltage Density vs
Frequency
Input Noise Current Density
vs Frequency
0.1Hz to 10Hz Noise Voltage
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
70
60
50
40
30
20
10
0
V
= ±2.5
S
0
1
2
3
4
5
6
7
8
9
10
1
10
100
1k
1
10
100
1k
TIME (SEC)
FREQUENCY (Hz)
FREQUENCY (Hz)
1638/39 G08
1638/39 G09
1638/39 G07
5
LT1638/LT1639
TYPICAL PERFORMANCE CHARACTERISTICS
W
U
Gain and Phase Shift vs
Frequency
Gain Bandwith Product vs
Temperature
Slew Rate vs Temperature
100
90
80
70
60
50
40
1500
1400
1300
1200
1100
1000
900
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0.25
f = 1kHz
V
= ±2.5V
S
RISING, V = ±15V
80
S
PHASE
70
V
= ±15V
RISING, V = ±2.5V
S
S
60
50
30
20
GAIN
40
30
20
10
0
FALLING, V = ±2.5V
S
10
0
FALLING, V = ±15V
V
S
= ±2.5V
S
–10
–20
800
1
10
100
1000
0
25
50
75 100 125
–50
0
25
TEMPERATURE (°C)
50
75 100 125
–50
–25
–25
FREQUENCY (kHz)
TEMPERATURE (°C)
1638/39 G12
1638/39 G13
1638/39 G14
Gain Bandwidth Product and
Phase Margin vs Supply Voltage
Gain Bandwidth Product and
Phase Margin vs Load Resistance
PSRR vs Frequency
1500
1400
1300
1200
1100
1000
60
50
40
30
20
10
1500
1400
1300
1200
1100
1000
900
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
0
V
A
= ±2.5V
V
= ±2.5V
S
V
F
S
= –1
R = R = 100k
G
f = 1kHz
PHASE MARGIN
PHASE MARGIN
POSITIVE SUPPLY
GAIN BANDWIDTH
NEGATIVE SUPPLY
GAIN BANDWIDTH
PRODUCT
800
–10
100
–10
1
10
LOAD RESISTANCE (kΩ)
0
5
10 15 20 25 30
35 40
TOTAL SUPPLY VOLTAGE (V)
45
1
10
100
1000
FREQUENCY (kHz)
1638/39 G17
1638/39 G16
1638/39 G15
CMRR vs Frequency
Output Impedance vs Frequency
Channel Separation vs Frequency
120
110
100
90
130
120
110
100
90
10k
1k
V
= ±15V
V
= ±2.5V
S
V
S
= ±15V
S
A
V
= 10
80
100
10
A
V
= 100
70
60
50
A
V
= 1
80
40
1
70
30
60
0.1
20
0.1
0.1
1
10
100
1000
1
10
100
1
10
FREQUENCY (kHz)
100
1000
FREQUENCY (kHz)
FREQUENCY (kHz)
1638/39 G20
1638/39 G18
1638/39 G19
6
LT1638/LT1639
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Settling Time to 0.1% vs
Output Step
Capacitive Load Handling,
Undistorted Output Swing
vs Frequency
Overshoot vs Capacitive Load
100
90
80
70
60
50
40
30
20
10
0
10
8
35
30
25
20
15
10
5
V
= ±15V
V
V
= 5V, 0V
DISTORTION ≤ 1%
L
S
S
V
S
= ±15V
= 2.5V
R = 20k
CM
A
= 1
V
I
= 150µA
SOURCE
6
A
= –1
V
4
2
0
A
= 5
V
A
= 1
–2
–4
–6
–8
–10
V
A
= 10
A
= –1
25
V
V
V
= ±2.5V
S
A
= 1
V
0
0
20
30
35
10
100
1000
10000
5
10
15
0.1
1
10
100
CAPACITIVE LOAD (pF)
SETTLING TIME (µs)
FREQUENCY (kHz)
1638/39 G22
1638/39 G23
1638/39 G21
Total Harmonic Distortion + Noise
vs Frequency
Total Harmonic Distortion + Noise
vs Load Resistance
Total Harmonic Distortion + Noise
vs Output Voltage
10
1
10
1
10
1
V
A
V
= 3V TOTAL
= 1
R
CM
= 10k, f = 1kHz
V
V
V
= 3V, 0V
S
V
L
S
V
= HALF SUPPLY
= 2V
OUT
P-P
= 2V AT 1kHz
A = –1, V = ±1.5V
= 1.2V
IN
P-P
V
V
V
V
S
CM
A
A
A
= –1, V = 3V, 0V
R
L
= 20k
S
= 1, V = ±1.5V
S
= 1, V = 3V, 0V
S
V
V
= ±1.5V
= ±1V
S
IN
0.1
0.1
0.1
V
V
= 3V, 0V
IN
S
= 0.5V TO 2.5V
0.01
0.001
0.01
0.01
A
= –1
= 1
V
V
V
= 3V, 0V
= 0.2V TO 2.2V
A
S
IN
V
0.001
0.001
0
1
2
3
0.01
0.1
1
10
100
0.1
1
10
100
OUTPUT VOLTAGE (V
)
P-P
FREQUENCY (Hz)
LOAD RESISTANCE TO GROUND (kΩ)
1638/39 G26
1638/39 G24
1638/39 G25
Open-Loop Gain
Large-Signal Response
Small-Signal Response
V
= ±15V
S
R = 2k
L
R = 10k
L
R = 50k
L
VS = ±15V
AV = 1
V
S = ±15V
AV = 1
L = 15pF
1638/39 G29
1638/39 G28
C
–20V
–10V
0V
10V
20V
OUTPUT VOLTAGE (5V/DIV)
1638/39 G27
7
LT1638/LT1639
U
W U U
APPLICATIONS INFORMATION
Supply Voltage
The inputs are protected against excursions as much as
22V below V– by an internal 1k resistor in series with each
input and a diode from the input to the negative supply.
TheinputstageoftheLT1638/LT1639incorporatesphase
reversal protection to prevent the output from phase
reversing for inputs up to 22V below V–. There are no
clamping diodes between the inputs and the maximum
differential input voltage is 44V.
The positive supply pin of the LT1638/LT1639 should be
bypassedwithasmallcapacitor(typically0.1µF)withinan
inch of the pin. When driving heavy loads an additional
4.7µF electrolytic capacitor should be used. When using
split supplies, the same is true for the negative supply pin.
The LT1638/LT1639 are protected against reverse battery
voltagesupto18V. Intheeventareversebatterycondition
occurs, the supply current is less than 1nA.
Output
The LT1638/LT1639 can be shut down by removingV+. In
this condition the input bias current is less than 0.1nA,
even if the inputs are 44V above the negative supply.
The output of the LT1638/LT1639 can swing within 20mV
of the positive rail with no load, and within 3mV of the
negative rail with no load. When monitoring voltages
within 20mV of the positive rail or within 3mV of the
negative rail, gain should be taken to keep the output from
clipping. The LT1638/LT1639 are capable of sinking and
sourcing over 40mA on ±15V supplies; sourcing current
capability is reduced to 20mA at 5V total supplies as noted
in the electrical characteristics.
At temperatures greater than 70°C, when operating the
LT1638/LT1639 on total supplies of 10V or more, the
supply must not be brought up faster than 1V/µs. Increas-
ing the bypass capacitor and/or adding a small resistor in
series with the supply will limit the rise time.
Inputs
The LT1638/LT1639 are internally compensated to drive
at least 200pF of capacitance under any output loading
conditions. A 0.22µF capacitor in series with a 150Ω
resistor between the output and ground will compensate
these amplifiers for larger capacitive loads, up to 1000pF,
at all output currents.
The LT1638/LT1639 have two input stages, NPN and PNP
(see the Simplified Schematic), resulting in three distinct
operating regions as shown in the Input Bias Current vs
Common Mode typical performance curve.
For input voltages about 0.8V or more below V+, the PNP
input stage is active and the input bias current is typically
–20nA. When the input common mode voltage is within
0.5Vofthepositiverail, theNPNstageisoperatingandthe
input bias current is typically 40nA. Increases in tempera-
ture will cause the voltage at which operation switches
from the PNP input stage to the NPN input stage to move
towards V+. The input offset voltage of the NPN stage is
untrimmed and is typically 600µV.
Distortion
There are two main contributors of distortion in op amps:
output crossover distortion as the output transitions from
sourcing to sinking current and distortion caused by non-
linear common mode rejection. If the op amp is operating
inverting there is no common mode induced distortion. If
theopampisoperatinginthePNPinputstage(inputisnot
within 0.8V of V+), the CMRR is very good, typically 98dB.
When the LT1638 switches between input stages there is
significant nonlinearity in the CMRR. Lower load resis-
tance increases the output crossover distortion, but has
no effect on the input stage transition distortion. For low-
estdistortiontheLT1638/LT1639shouldbeoperatedsingle
supply, with the output always sourcing current and with
the input voltage swing between ground and (V+ – 0.8V).
See the Typical Performance Characteristics curves.
A Schottky diode in the collector of each NPN transistor
allow the LT1638/LT1639 to operate over the top, with
either or both of its inputs above V+. At about 0.3V above
V+ the NPN input transistor is fully saturated and the input
bias current is typically 8µA at room temperature. The
inputoffsetvoltageistypically2mVwhenoperatingabove
V+. The LT1638/LT1639 will operate with its inputs 44V
above V– regardless of V+.
8
LT1638/LT1639
U
W U U
APPLICATIONS INFORMATION
Gain
mance in single supply applications where the load is
returned to ground. The typical performance curve of
Open-Loop Gain for various loads shows the details.
The open-loop gain is almost independent of load when
the output is sourcing current. This optimizes perfor-
U
TYPICAL APPLICATIONS
V
CC
With 1.2MHz bandwidth, Over-The-Top capability, re-
verse-battery protection and rail-to-rail input and output
features, the LT1638/LT1639 are ideal candidates for
general purpose applications.
R5
100k
+
–
1/4 LT1639
LT1634-1.2V
The lowpass slope limiting filter in Figure 1 limits the
maximum dV/dT (not frequency) that it passes. When the
input signal differs from the output by one forward diode
drop, D1 or D2 will turn on. With a diode on, the voltage
across R2 will be constant and a fixed current, VDIODE/R2,
will flow through capacitor C1, charging it linearly instead
of exponentially. The maximum slope that the circuit will
pass is equal to VDIODE divided by (R2)(C1). No matter
how fast the input changes the output will never change
any faster than the dV/dT set by the diodes and (R2)(C).
D1
D2
R3
100k
–
R1
1k
V
OUT
1/4 LT1639
R2
V
IN
+
C1
R4
100k
LT1634-1.2V
D4
D3
D1
–
+
1/4 LT1639
D2
FOR R2 = 50k, C1 = 500pF,
MAXIMUM SLOPE = 0.048V/µs
R6
100k
R1
R2
d
dt
1.2V
(R2)(C1)
1638/39 F02
V
+
V
OUT
=
IN
V
EE
C1
V
1/2 LT1638
OUT
V
d
dt
D
V
=
OUT(MAX)
(R2)(C1)
–
FOR R1 = 10k, R2 = 100k, C1 = 1000pF
d
V
= 0.006V/µs
1638/39 F01
OUT(MAX)
Response of Slope Limiting Filter
dt
Figure 1. Lowpass Slope Limiting Filter
VOUT
A modification of this application is shown in Figure 2
using references instead of diodes to set the maximum
slope. By using references, the slope is independent of
temperature. A scope photo shows a 1VP-P, 2kHz input
signal with a 2V pulse added to the sine wave; the circuit
passes the 2kHz signal but limits the slope of the pulse.
VIN
1638/39 TA02
The application in Figure 3 utilizes the Over-The-Top
capabilities of the LT1638. The 0.2Ω resistor senses the
load current while the op amp and NPN transistor form a
closed loop making the collector current of Q1
Figure 2. Lowpass Slope Limiting Filter with 0TC
9
LT1638/LT1639
U
TYPICAL APPLICATIONS
proportional to the load current. As a convenient monitor,
the2kloadresistorconvertsthecurrentintoavoltage.The
positive supply rail, V+, is not limited to the 5V supply of
the op amp and could be as high as 44V.
The Figure 4 application uses the LT1638 in conjunction
with the LT1634 micropower shunt reference. The supply
current of the op amp also biases the reference. The drop
across resistor R1 is fixed at 1.2V generating an output
current equal to 1.2V/R1.
+
V
200Ω
V
CC
V
CC
LT1634-1.2
R1
5V
0.2Ω
+
Q1
1/2 LT1638
+
2N3904
200Ω
–
1.2V
R1
0V TO 4.3V
1/2 LT1638
I
=
OUT
2k
I
LOAD
LOAD
–
I
OUT
1638/39 F03
V
= (2Ω)(I )
LOAD
OUT
1638/39 F04
Figure 3. Positive Supply Rail Current Sense
Figure 4. Current Source
W
W
SI PLIFIED SCHE ATIC
+
V
Q2
Q1
Q3
Q22
D1
D2
D3
R1
R2
1k
6k
Q19
Q4
–IN
+IN
Q17
Q18
Q20
OUT
Q7
Q8
Q11 Q12
R3
1k
+
Q16
10µA
Q15
Q9
Q10
Q13
Q14
Q21
R4
8k
R5
8k
Q5
Q6
D4
D5
–
V
ONE AMPLIFIER
1638/39 SS
U
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTION
MS8 Package
8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
0.118 ± 0.004*
(3.00 ± 0.102)
8
7
6
5
0.040 ± 0.006
(1.02 ± 0.15)
0.034 ± 0.004
(0.86 ± 0.102)
0.007
(0.18)
0° – 6° TYP
0.118 ± 0.004**
(3.00 ± 0.102)
SEATING
PLANE
0.192 ± 0.004
(4.88 ± 0.10)
0.012
(0.30)
REF
0.021 ± 0.006
(0.53 ± 0.015)
0.006 ± 0.004
(0.15 ± 0.102)
0.0256
(0.65)
TYP
MSOP (MS8) 1197
1
2
3
4
*
DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,
PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
10
LT1638/LT1639
U
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTION
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400*
(10.160)
MAX
0.130 ± 0.005
0.300 – 0.325
0.045 – 0.065
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
8
1
7
6
5
0.065
(1.651)
TYP
0.255 ± 0.015*
(6.477 ± 0.381)
0.009 – 0.015
(0.229 – 0.381)
0.125
0.020
(0.508)
MIN
(3.175)
MIN
+0.035
–0.015
2
4
3
0.325
N8 1197
0.100 ± 0.010
(2.540 ± 0.254)
0.018 ± 0.003
+0.889
8.255
(
)
(0.457 ± 0.076)
–0.381
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
0.010 – 0.020
(0.254 – 0.508)
7
5
8
6
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
0.016 – 0.050
0.406 – 1.270
0.050
(1.270)
TYP
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
SO8 0996
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
1
2
3
4
N Package
14-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.770*
(19.558)
MAX
0.300 – 0.325
(7.620 – 8.255)
0.045 – 0.065
0.130 ± 0.005
(3.302 ± 0.127)
(1.143 – 1.651)
14
13
12
11
10
9
8
7
0.020
(0.508)
MIN
0.255 ± 0.015*
(6.477 ± 0.381)
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
+0.035
1
2
3
5
6
4
0.325
0.005
(0.125)
MIN
0.100 ± 0.010
(2.540 ± 0.254)
–0.015
0.125
(3.175)
MIN
0.018 ± 0.003
N14 1197
+0.889
8.255
(0.457 ± 0.076)
(
)
–0.381
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
S Package
14-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.337 – 0.344*
(8.560 – 8.738)
0.010 – 0.020
14
13
12
11
10
9
8
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
0° – 8° TYP
0.228 – 0.244
(5.791 – 6.197)
0.150 – 0.157**
(3.810 – 3.988)
0.050
(1.270)
TYP
0.014 – 0.019
(0.355 – 0.483)
0.016 – 0.050
0.406 – 1.270
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
S14 0695
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
1
2
3
4
5
6
7
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LT1638/LT1639
U
TYPICAL APPLICATION
The battery monitor in Figure 5 also demonstrates the
LT1638’s ability to operate with its inputs above the
positive rail. In this application, a conventional amplifier
would be limited to a battery voltage between 5V and
ground, but the LT1638 can handle battery voltages as
high as 44V. When the battery is charging, Amp B senses
the voltage drop across RS. The output of Amp B causes
Q2 to drain sufficient current through RB to balance the
input of Amp B. Likewise, Amp A and Q1 form a closed
loopwhenthebatteryisdischarging. Thecurrentthrough
Q1 or Q2 is proportional to the current in RS and this
currentflowsintoRG andisconvertedintoavoltage. Amp
D buffers and amplifies the voltage across RG. Amp C
compares the output of Amp A and Amp B to determine
the polarity of current through RS. The scale factor for
VOUT withS1openis1V/A. WithS1closedthescalefactor
is 1V/100mA and currents as low as 500µA can be
measured.
R , 0.2Ω
R , 2k
S
A
Q1
2N3904
CHARGER
VOLTAGE
+
A
+
1/4 LT1639
R
A
2k
',
I
BATT
C
LOGIC
–
1/4 LT1639
–
R , 2k
B
Q2
2N3904
LOGIC HIGH (5V) = CHARGING
+
LOGIC LOW (0V) = DISCHARGING
B
1/4 LT1639
R
, 2k
'
B
+
–
+
LOAD
D
R
G
V
OUT
1/4 LT1639
V
= 12V
10k
BATT
–
S1
10k
90.9k
1638/39 F05
V
V
OUT
OUT
S1 = OPEN, GAIN = 1
S1 = CLOSED, GAIN = 10
R
S
= R
A
B
I
=
=
AMPS
BATT
V
= 5V, 0V
(R )(R /R )(GAIN) GAIN
S
G
A
Figure 5. Battery Monitor
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
Input/Output Common Mode Includes Ground, 70µV V
and 2.5µV/°C Drift (Max), 200kHz GBW, 0.07V/µs Slew Rate
LT1078/LT1079
LT2078/LT2079
Dual/Quad 55µA Max, Single Supply, Precision Op Amps
Dual/Quad 17µA Max, Single Supply, Precison Op Amps
Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps
OS(MAX)
LT1178/LT1179
LT2178/LT2179
Input/Output Common Mode Includes Ground, 70µV V
and 4µV/°C Drift (Max), 85kHz GBW, 0.04V/µs Slew Rate
OS(MAX)
LT1366/LT1367
LT1490/LT1491
475µV V , 500V/mV A , 400kHz GBW
OS(MAX)
VOL(MIN)
Dual/Quad Over-The-Top Micropower, Rail-to-Rail Input and
Output Op Amps
Single Supply Input Range: –0.4V to 44V, Micropower 50µA
per Amplifier, Rail-to-Rail Input and Output, 200kHz GBW
LT1636
Single Over-The-Top Micropower Rail-to-Rail Input and Output
Op Amp
55µA Supply Current, V
Extends 44V above V ,
CM EE
Independent of V ; MSOP Package, Shutdown Function
CC
16389f LT/TP 1098 4K • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
●
●
LINEAR TECHNOLOGY CORPORATION 1998
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
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