LT1220 [Linear]
45MHz, 250V/us Operational Amplifier; 为45MHz , 250V / us的运算放大器型号: | LT1220 |
厂家: | Linear |
描述: | 45MHz, 250V/us Operational Amplifier |
文件: | 总8页 (文件大小:292K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT1220
45MHz, 250V/µs
Operational Amplifier
U
DESCRIPTIO
EATURE
S
F
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Gain-Bandwidth: 45MHz
The LT1220 is a high speed operational amplifier with
superior DC performance. The LT1220 features reduced
input offset voltage, lower input bias currents and higher
DCgainthandeviceswithcomparablebandwidthandslew
rate. The circuit is a single gain stage that includes
proprietary DC gain enhancement circuitry to obtain pre-
cisionwithhighspeed. Thehighgainandfastsettlingtime
make the circuit an ideal choice for data acquisition
systems. The circuit is also capable of driving large
capacitive loads which makes it useful in buffer or cable
driver applications.
Unity-Gain Stable
Slew Rate: 250V/µs
C-LoadTM Op Amp Drives Capacitive Loads
Maximum Input Offset Voltage: 1mV
Maximum Input Bias Current: 300nA
Maximum Input Offset Current: 300nA
Minimum Output Swing Into 500Ω: ±12V
Minimum DC Gain: 20V/mV, RL = 500Ω
Settling Time to 0.1%: 75ns, 10V Step
Settling Time to 0.01%: 95ns, 10V Step
Differential Gain: 0.1%, AV = 2, RL = 150Ω
Differential Phase: 0.2°, AV = 2, RL = 150Ω
The LT1220 is a member of a family of fast, high perfor-
mance amplifiers that employ Linear Technology
Corporation’s advanced complementary bipolar process-
ing. For applications with gains of 4 or greater the LT1221
can be used, and for gains of 10 or greater the LT1222 can
be used for increased bandwidth.
O U
PPLICATI
A
S
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Wideband Amplifiers
Buffers
Active Filters
Video and RF Amplification
Cable Drivers
8-, 10-, 12-Bit Data Acquisition Systems
and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation.
C-Load is a trademark of Linear Technology Cortporation.
U
TYPICAL APPLICATION
Two Op Amp Instrumentation Amplifier
Inverter Pulse Response
R5
220Ω
R4
10k
R1
10k
R2
1k
–
+
R3
1k
–
+
LT1220
V
LT1220
–
IN
OUT
V
+
GAIN = [R4/R3][1 + (1/2)(R2/R1 + R3/R4) + (R2 + R3)/R5] = 102
TRIM R5 FOR GAIN
TRIM R1 FOR COMMON-MODE REJECTION
BW = 450kHz
LT1220 • TA01
LT1220 • TA02
V
IN = 20V
RF = RG = 1k
S = ±15V
f = 2MHz
V
1
LT1220
W W W
U
ABSOLUTE AXI U RATI GS
Total Supply Voltage (V+ to V–).............................. 36V
Differential Input Voltage ........................................ ±6V
Input Voltage .......................................................... ±VS
Output Short-Circuit Duration (Note 1)........... Indefinite
Specified Temperature Range
Operating Temperature Range
LT1220C........................................... –40°C TO 85°C
LT1220M ......................................... –55°C to 150°C
Maximum Junction Temperature (See Below)
Plastic Package ............................................... 150°C
Ceramic Package ............................................. 175°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
LT1220C (Note 2)................................... 0°C to 70°C
LT1220M ......................................... –55°C to 125°C
W
U
/O
PACKAGE RDER I FOR ATIO
TOP VIEW
ORDER PART
ORDER PART
TOP VIEW
NUMBER
NULL
NUMBER
NULL
–IN
1
2
3
4
NULL
8
7
6
5
+
8
V
+
1
3
V
SPECIAL
ORDER
CONSULT
FACTORY
LT1220CN8
LT1220MJ8
LT1220CS8
NULL
–IN
+IN
7
5
+IN
V
OUT
–
6
2
V
OUT
V
NC
NC
J8 PACKAGE
N8 PACKAGE
4
8-LEAD CERAMIC DIP 8-LEAD PLASTIC DIP
S8 PART MARKING
1220
–
V
S8 PACKAGE
8-LEAD PLASTIC SOIC
H PACKAGE
8-LEAD TO-5 METAL CAN
TJMAX = 175°C, θJA = 100°C/W (J)
TJMAX = 150°C, θJA = 130°C/W (N)
TJMAX = 150°C, θJA = 190°C/W (S)
TJMAX = 175°C, θJA = 150°C/W
Consult factory for Industrial grade parts.
VS = ±15V, TA = 25°C, VCM = 0V, unless otherwise specified.
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
(Note 3)
MIN
TYP
0.5
100
100
17
MAX
1
UNITS
mV
V
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Noise Voltage
Input Noise Current
Input Resistance
OS
I
I
300
300
nA
nA
OS
B
e
f = 10kHz
f = 10kHz
nV/√Hz
pA/√Hz
n
i
2
n
R
V
= ±12V
CM
Differential
20
12
45
MΩ
kΩ
IN
150
C
Inut Capacitance
2
14
–13
pF
V
V
IN
Input Voltage Range (Positive)
Input Voltage Range (Negative)
–12
CMRR
PSRR
Common-Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Output Swing
V
= ±12V
92
90
114
94
50
13
26
250
4
dB
dB
CM
V = ±5V to ±15V
S
A
V
V
= ±10V, R = 500Ω
20
12
V/mV
±V
VOL
OUT
OUT
OUT
L
R = 500Ω
L
I
Output Current
V
= ±12V
24
mA
OUT
SR
Slew Rate
Full Power Bandwidth
Gain-Bandwidth
(Note 4)
10V Peak (Note 5)
f = 1MHz
200
V/µs
MHz
MHz
GBW
45
2
LT1220
VS = ±15V, TA = 25°C, VCM = 0V, unless otherwise specified.
ELECTRICAL CHARACTERISTICS
SYMBOL
t , t
PARAMETER
CONDITIONS
A = 1, 10% to 90%, 0.1V
MIN
TYP
2.5
5
MAX
UNITS
ns
Rise Time, Fall Time
Overshoot
r
f
V
A = 1, 0.1V
%
V
Propagation Delay
Settling Time
A = 1, 50% V to 50% V , 0.1V
4.9
ns
V
IN
OUT
t
10V Step, 0.1%
10V Step, 0.01%
75
95
ns
ns
s
Differential Gain
Differential Phase
f = 3.58MHz, R = 150Ω (Note 6)
0.10
0.02
%
%
L
f = 3.58MHz, R = 1k (Note 6)
L
f = 3.58MHz, R = 150Ω (Note 6)
0.20
0.03
DEG
DEG
L
f = 3.58MHz, R = 1k (Note 6)
L
R
Output Resistance
Supply Current
A = 1, f = 1MHz
V
1
8
Ω
O
I
10.5
mA
S
VS = ±15V, 0°C ≤ TA ≤ 70°C, VCM = 0V, unless otherwise specified.
SYMBOL
PARAMETER
Input Offset Voltage
CONDITIONS
(Note 3)
MIN
TYP
0.5
20
MAX
3.5
UNITS
mV
V
OS
●
Input V Drift
µV/°C
nA
OS
I
I
Input Offset Current
Input Bias Current
Common-Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Output Swing
●
●
●
●
●
●
●
●
●
100
100
114
94
400
400
OS
nA
B
CMRR
PSRR
V
CM
= ±12V
92
86
dB
dB
V = ±5V to ±15V
S
A
V
V
OUT
= ±10V, R = 500Ω
20
50
V/mV
±V
mA
VOL
OUT
OUT
L
R = 500Ω
12
24
13
26
L
I
Output Current
V
OUT
= ±12V
SR
Slew Rate
(Note 4)
180
250
8
V/µs
mA
I
Supply Current
11
S
VS = ±15V, –55°C ≤ TA ≤ 125°C, VCM = 0V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
0.5
20
MAX
UNITS
mV
µV/°C
nA
V
Input Offset Voltage
(Note 3)
●
4
OS
Input V Drift
OS
I
I
Input Offset Current
●
●
●
●
●
100
100
114
94
800
OS
Input Bias Current
1000
nA
dB
B
CMRR
PSRR
Common-Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Output Swing
V
= ±12V
92
82
5
10
12
CM
V = ±5V to ±15V
S
dB
A
V
V
= ±10V, R = 500Ω
50
13
13
V/mV
±V
±V
VOL
OUT
OUT
L
R = 500Ω
●
●
L
R = 1k
L
I
Output Current
V
V
= ±10V
= ±12V
●
●
20
12
26
13
mA
mA
OUT
OUT
OUT
SR
Slew Rate
Supply Current
(Note 4)
●
●
130
250
8
V/µs
mA
I
11
S
The
● denotes specifications which apply over the full temperature range.
Note 3: Input offset voltage is pulse tested and is exclusive of warm-up drift.
Note 4: Slew rate is measured between ±10V on an output swing of ±12V.
Note 1: A heat sink may be required when the output is shorted indefinitely.
Note 2: Commercial parts are designed to operate over –40°C to 85°C, but
are not tested nor guaranteed beyond 0°C to 70°C. Industrial grade parts
specified and tested over –40°C to 85°C are available on special request.
Consut factory.
Note 5: FPBW = SR/2πV .
Note 6: Differential Gain and Phase are tested in A = 2 with five amps in
series. Attenuators of 1/2 are used as loads (75Ω, 75Ω and 499Ω, 499Ω).
P
V
3
LT1220
TYPICAL PERFORMANCE CHARACTERISTICS
W
U
Input Common-Mode Range
vs Supply Voltage
Supply Current vs Supply Voltage
and Temperature
Output Voltage Swing
vs Supply Voltage
20
15
10
5
9.0
8.5
8.0
7.5
7.0
20
15
10
5
T
= 25°C
T
= 25°C
T
= 25°C
OS
A
A
L
A
R
= 500Ω
∆V = 0.5mV
∆V = 30mV
OS
+V
–V
CM
+V
SW
CM
–V
SW
0
0
0
5
10
15
20
0
5
10
15
20
0
5
10
15
20
SUPPLY VOLTAGE (±V)
SUPPLY VOLTAGE (±V)
SUPPLY VOLTAGE (±V)
LT1220 • TPC01
LT1220 • TPC02
LT1220 • TPC03
Output Voltage Swing
vs Resistive Load
Input Bias Current
vs Input Common-Mode Voltage
Open-Loop Gain
vs Resistive Load
30
25
500
400
300
200
100
0
110
100
T
= 25°C
= ±15V
T
= 25°C
T
= 25°C
A
S
A
A
V
∆V = 30mV
OS
V
= ±15V
S
+
20
15
10
5
I
B
90
80
70
60
±15V SUPPLIES
–
I
B
V
= ±5V
S
–100
–200
–300
±5V SUPPLIES
–400
–500
0
10
100
1k
10k
–15 –10
–5
0
5
10
15
10
100
1k
10k
LOAD RESISTANCE (Ω)
INPUT COMMON-MODE VOLTAGE (V)
LOAD RESISTANCE (Ω)
LT1220 • TPC04
LT1220 • TPC05
LT1220 • TPC06
Output Short-Circuit Current
vs Temperature
Power Supply Rejection Ratio
vs Frequency
Input Noise Spectral Density
50
45
40
35
30
25
20
160
140
100
80
60
40
20
0
V
= ±5V
V
T
= ±15V
V
T
V
= ±15V
= 25°C
= 100
S
S
A
S
A
= 25°C
A
120
100
80
+PSRR
60
–PSRR
40
20
0
–50 –25
0
25
50
75 100 125
10
100
1k
10k
100k
100
1k
10k
100k
1M 10M 100M
FREQUENCY (Hz)
TEMPERATURE (°C)
FREQUENCY (Hz)
LT1220 • TPC07
LT1220 • TPC08
LT1220 • TPC09
4
LT1220
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Common-Mode Rejection Ratio
vs Frequency
Output Swing and Error
Output Swing and Error
vs Settling Time (Inverting)
vs Settling Time (Noninverting)
120
100
10
8
10
8
V
= ±15V
= 25°C
S
A
T
6
4
6
4
10mV
1mV
10mV
1mV
80
60
2
0
2
0
–2
–4
–2
–4
40
20
0
10mV
25
1mV
75
10mV
1mV
–6
–8
–6
–8
–10
–10
1k
10k
100k
FREQUENCY (Hz)
1M
10M
100M
0
100
125
0
25
75
SETTLING TIME (ns)
100
125
50
50
SETTLING TIME (ns)
LT1220 • TPC10
LT1220 • TPC11
LT1220 • TPC12
Voltage Gain and Phase
vs Frequency
Frequency Response
vs Capacitive Load
Closed-Loop Output Impedance
vs Frequency
100
80
60
40
100
80
60
40
20
0
10
100
10
1
V
T
= ±15V
= 25°C
= 1
V
T
= ±15V
= 25°C
= –1
S
A
V
S
A
V
V
= ±15V
S
8
6
4
2
A
A
V
= ±5V
S
0
–2
–4
–6
–8
C = 100pF
C = 50pF
V
= ±15V
S
20
V
= ±5V
0.1
S
C = 0
C = 500pF
0
T
= 25°C
1k
C = 1000pF
A
0.01
–20
–20
–10
100
10k
100k
1M 10M 100M
1
10
FREQUENCY (MHz)
100
10k
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
LT1220 • TPC15
LT1220 • TPC13
LT1220 • TPC14
Total Harmonic Distortion
vs Frequency
Gain-Bandwidth vs Temperature
Slew Rate vs Temperature
0.01
0.001
50
48
46
44
42
40
38
300
275
250
225
200
175
150
V
A
= ±15V
= –1
V
V
= ±15V
RMS
= 500Ω
V
= ±15V
S
V
S
O
L
S
= 3V
+SR
R
= R = 1k
R
IN
F
–SR
A
= –1
V
A
V
= 1
0.0001
10
100
1k
10k
100k
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100 125
FREQUENCY (Hz)
TEMPERATURE (°C)
TEMPERATURE (°C)
LT1220 • TPC18
LT1220 • TPC16
LT1220 • TPC24
5
LT1220
TYPICAL PERFORMANCE CHARACTERISTICS
W
U
Large Signal, AV = 1,
CL = 10,000pF
Small Signal, AV = 1
Large Signal, AV = 1
LT1220 • TPC19
LT1220 • TPC20
LT1220 • TPC21
V
IN = 100mV
V
IN = 20V
VIN = 10V
f = 20kHz
RG = 0
S = ±15V
RG = 0
VS = ±15V
RG = 0
VS = ±15V
f = 5MHz
f = 2MHz
V
Small Signal, AV = –1,
CL = 1,000pF
Small Signal, AV = –1
Large Signal, AV = –1
LT1220 • TPC22
LT1220 • TPC23
LT1220 • TPC24
V
IN = 100mV
V
IN = 20V
VIN = 200mV
f = 200kHz
RF = RG = 1k
S = ±15V
RF = RG = 1k
S = ±15V
R
F = RG = 1k
f = 5MHz
f = 2MHz
V
V
VS = ±15V
U
W U U
APPLICATIONS INFORMATION
The LT1220 may be inserted directly into HA2505/15/25,
HA2541/2/4,AD817,AD847,EL2020,EL2044andLM6361
applications, providedthatthenullingcircuitryisremoved.
The suggested nulling circuit for the LT1220 is shown in
the following figure.
Layout and Passive Components
The LT1220 amplifier is easy to apply and tolerant of less
than ideal layouts. For maximum performance (for ex-
ample, fast settling time) use a ground plane, short lead
lengthsandRF-qualitybypasscapacitors(0.01µFto0.1µF).
For high driver current applications use low ESR bypass
capacitors (1µF to 10µF tantalum). Sockets should be
avoided when maximum frequency performance is re-
quired, although low profile sockets can provide reason-
able performance up to 50MHz. For more details see
Design Note 50. Feedback resistors greater than 5k are not
recommended because a pole is formed with the input
capacitance which can cause peaking or oscillations.
Offset Nulling
+
V
5k
1
0.1µF
3
2
8
+
7
4
6
LT1220
–
0.1µF
–
LT1220 • AI01
V
6
LT1220
U
W U U
APPLICATIONS INFORMATION
Input Considerations
(i.e., 75Ω) should be placed in series with the output. The
other end of the cable should be terminated with the same
value resistor to ground.
Bias current cancellation circuitry is employed on the
inputs of the LT1220 so the input bias current and input
offsetcurrenthaveidenticalspecifications.Forthisreason,
matching the impedance on the inputs to reduce bias
current errors is not necessary.
DAC Current-to-Voltage Amplifier
The high gain, low offset voltage, low input bias current,
and fast settling of the LT1220 make it particularly useful
as an I/V converter for current output DACs. A typical
application is shown with a 565A type, 12-bit, 2mA full-
scale output current DAC. The 5k resistor around the
LT1220 is internal to the DAC and gives a 10V full-scale
outputvoltage.A5pFcapacitorinparallelwiththefeedback
resistor compensates for the DAC output capacitance and
improves settling. The output of the LT1220 settles to
1/2LSB (1.2mV) in less than 300ns. The accuracy of this
circuit is equal to:
Capacitive Loading
The LT1220 is stable with capacitive loads. This is accom-
plishedbysensingtheloadinducedoutputpoleandadding
compensation at the amplifier gain node. As the capacitive
load increases, both the bandwidth and phase margin
decrease. There will be peaking in the frequency domain as
shown in the curve of Frequency Response vs Capacitive
Load. The small-signal transient response will have more
overshoot as shown in the photo of the small-signal
responsewith1000pFload.Thelarge-signalresponsewith
a 10,000pF load shows the output slew rate being limited
to 4V/µs by the short-circuit current. The LT1220 can drive
coaxialcabledirectly, butforbestpulsefidelityaresistorof
value equal to the characteristic impedance of the cable
V
ERROR = VOS + (IOS × 5kΩ) + (VOUT/AVOL)
Atroomtemperaturetheworst-caseerroris3mV(1.2LSB).
Typicallytheerroris1.2mV(1/2LSB).Overthecommercial
temperature range the worse-case error is 6mV (2.5LSB).
U
TYPICAL APPLICATIONS N
DAC Current-to-Voltage Converter
Cable Driver
5pF
12
5k
+
V
IN
75Ω CABLE
DAC
INPUTS
75Ω
–
LT1220
V
OUT
565A TYPE
LT1220
V
OUT
–
75Ω
+
V
OUT
A
VOL
1k
V + I (5kΩ) +
OS OS
< 1/2LSB
LT1220 • TA04
1k
LT1220 • TA03
1MHz, 4th Order Butterworth Filter
909Ω
1.1k
47pF
22pF
2.67k
909Ω
V
–
+
IN
1.1k
2.21k
LT1220
–
+
220pF
LT1220
V
OUT
470pF
LT1220 • TA05
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.
7
LT1220
W
W
SI PLIFIED SCHE ATIC
+
V
7
NULL
1
8
BIAS 1
BIAS 2
6
OUT
–IN
2
+IN
3
4
–
V
LT1220 • SS
U
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTION
0.335 – 0.370
(8.509 – 9.398)
DIA
0.305 – 0.335
(7.747 – 8.509)
0.027 – 0.045
(0.686 – 1.143)
45°TYP
0.040
(1.016)
MAX
0.027 – 0.034
(0.686 – 0.864)
0.050
0.165 – 0.185
(1.270)
MAX
(4.191 – 4.699)
0.200 – 0.230
H8 Package
REFERENCE
PLANE
(5.080 – 5.842)
SEATING
BSC
8-Lead TO-5
GAUGE
PLANE
PLANE
0.500 – 0.750
(12.700 – 19.050)
Metal Can
0.010 – 0.045
(0.254 – 1.143)
0.110 – 0.160
(2.794 – 4.064)
INSULATING
STANDOFF
0.016 – 0.021
(0.406 – 0.533)
NOTE: LEAD DIAMETER IS UNCONTROLLED BETWEEN
THE REFERENCE PLANE AND SEATING PLANE.
0.405
(10.287)
MAX
0.005
(0.127)
MIN
0.200
(5.080)
MAX
0.300 BSC
(0.762 BSC)
CORNER LEADS OPTION
(4 PLCS)
6
5
4
8
7
0.015 – 0.060
(0.381 – 1.524)
J8 Package
8-Lead Ceramic Dip
0.023 – 0.045
0.025
(0.635)
RAD TYP
0.220 – 0.310
(5.588 – 7.874)
(0.584 – 1.143)
HALF LEAD
OPTION
0.008 – 0.018
0° – 15°
0.045 – 0.068
(0.203 – 0.457)
(1.143 – 1.727)
FULL LEAD
OPTION
1
2
3
0.045 – 0.068
(1.143 – 1.727)
0.385 ± 0.025
(9.779 ± 0.635)
0.125
3.175
MIN
0.100 ± 0.010
(2.540 ± 0.254)
0.014 – 0.026
(0.360 – 0.660)
NOTE: LEAD DIMENSIONS APPLY TO SOLDER
DIP/PLATE OR TIN PLATE LEADS.
0.400*
(10.160)
MAX
0.130 ± 0.005
(3.302 ± 0.127)
0.300 – 0.325
(7.620 – 8.255)
0.045 – 0.065
(1.143 – 1.651)
8
1
7
6
5
N8 Package
8-Lead Plastic Dip
0.065
(1.651)
TYP
0.255 ± 0.015*
(6.477 ± 0.381)
0.009 – 0.015
(0.229 – 0.381)
0.125
0.015
(0.380)
MIN
(3.175)
MIN
+0.025
–0.015
2
4
3
0.045 ± 0.015
(1.143 ± 0.381)
0.325
+0.635
8.255
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR
PROTRUSIONS. MOLD FLASH OR PROTURSIONS SHALL
NOT EXCEED 0.010 INCH (0.254mm).
(
)
–0.381
0.100 ± 0.010
(2.540 ± 0.254)
0.018 ± 0.003
(0.457 ± 0.076)
0.189 – 0.197*
(4.801 – 5.004)
0.010 – 0.020
(0.254 – 0.508)
8
7
6
5
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
S8 Package
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
8-Lead Plastic SOIC
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)
BSC
0.014 – 0.019
(0.355 – 0.483)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
1
2
3
4
LT/GP 0894 5K REV A • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1991
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
8
●
●
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
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