Datasheet

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LT1351

250µA, 3MHz, 200V/µs

Operational Amplifier

FEATURES

DESCRIPTION

■

3MHz Gain Bandwidth

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200V/µs Slew Rate

■

250µA Supply Current

■

Available in Tiny MSOP Package

■

C-Load

Op Amp Drives All Capacitive Loads

■

Unity-Gain Stable

■

Power Saving Shutdown Feature

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Maximum Input Offset Voltage: 600µV

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Maximum Input Bias Current: 50nA

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Maximum Input Offset Current: 15nA

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Minimum DC Gain, R

= 2k: 30V/mV

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Input Noise Voltage: 14nV/√Hz

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Settling Time to 0.1%, 10V Step: 700ns

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Settling Time to 0.01%, 10V Step: 1.25µs

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Minimum Output Swing into 1k: ±13V

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Minimum Output Swing into 500Ω: ±3.4V

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Specified at ±2.5V, ±5V and ±15V

The LT

1351 is a low power, high speed, high slew rate

operational amplifier with outstanding AC and DC perfor-

mance. The LT1351 features lower supply current, lower

input offset voltage, lower input bias current and higher

DC gain than devices with comparable bandwidth. The

circuit combines the slewing performance of a current

feedback amplifier in a true operational amplifier with

matched high impedance inputs. The high slew rate en-

sures that the large-signal bandwidth is not degraded. The

amplifier is a single gain stage with outstanding settling

characteristics which make the circuit an ideal choice for

data acquisition systems. The output drives a 1kΩ load to

±13V with ±15V supplies and a 500Ω load to ±3.4V on ±5V

supplies. The amplifier is also stable with any capacitive

load which makes it useful in buffer or cable driver

applications.

The LT1351 is a member of a family of fast, high perfor-

mance amplifiers using this unique topology and employ-

ing Linear Technology Corporation’s advanced

complementary bipolar processing. For dual and quad

amplifier versions of the LT1351 see the LT1352/LT1353

data sheet. For higher bandwidth devices with higher

supply current see the LT1354 through LT1365 data sheets.

Singles, duals and quads of each amplifier are available.

TYPICAL APPLICATION

C-Load is a trademark of Linear Technology Corporation.

, LTC and LT are registered trademarks of Linear Technology Corporation.

Instrumentation Amplifier

Large-Signal Response

–

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 = 30kHz

–

LT1351

–

LT1351

R1

50k

R2

R5

1.1k

R3

R4

50k

OUT

1351 TA01

= –1 1351 TA02

APPLICATIONS

■

Battery-Powered Systems

■

Wideband Amplifiers

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Buffers

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Active Filters

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Data Acquisition Systems

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Photodiode Amplifiers

Summary of content (16 pages)

PAGE 1
LT1351 250µA, 3MHz, 200V/µs Operational Amplifier U DESCRIPTION FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ The LT ®1351 is a low power, high speed, high slew rate operational amplifier with outstanding AC and DC performance. The LT1351 features lower supply current, lower input offset voltage, lower input bias current and higher DC gain than devices with comparable bandwidth.
PAGE 2
LT1351 W W U W ABSOLUTE MAXIMUM RATINGS Total Supply Voltage (V + to V –) .............................. 36V Differential Input Voltage (Transient Only, Note 1) ... ±10V Input Voltage .......................................................... ±VS Output Short-Circuit Duration (Note 2) ........... Indefinite Operating Temperature Range ................ – 40°C to 85°C Specified Temperature Range (Note 6) .....– 40°C to 85°C Maximum Junction Temperature (See Below) Plastic Package ........................
PAGE 3
LT1351 ELECTRICAL CHARACTERISTICS TA = 25°C, VCM = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS VSUPPLY MIN TYP AVOL Large-Signal Voltage Gain VOUT IOUT VOUT = ±12V, RL = 5k VOUT = ±10V, RL = 2k VOUT = ±10V, RL = 1k VOUT = ±2.5V, RL = 5k VOUT = ±2 .5V, RL = 2k VOUT = ±2.5V, RL = 1k VOUT = ±1V, RL = 5k ±15V ±15V ±15V ±5V ±5V ±5V ±2.
PAGE 4
LT1351 ELECTRICAL CHARACTERISTICS 0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS VSUPPLY MIN CMRR Common Mode Rejection Ratio VCM = ±12V VCM = ±2.5V VCM = ±0.5V ±15V ±5V ±2.5V 78 77 67 dB dB dB PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V 89 dB AVOL Large-Signal Voltage Gain VOUT = ±12V, RL = 5k VOUT = ±10V, RL = 2k VOUT = ±2.5V, RL = 5k VOUT = ±2 .5V, RL = 2k VOUT = ±2.5V, RL = 1k VOUT = ±1V, RL = 5k ±15V ±15V ±5V ±5V ±5V ±2.
PAGE 5
LT1351 ELECTRICAL CHARACTERISTICS – 40°C ≤ TA ≤ 85°C, VCM = 0V unless otherwise noted (Note 6). SYMBOL PARAMETER CONDITIONS VSUPPLY MIN VOUT Output Swing RL = 5k, VIN = ±10mV RL = 2k, VIN = ±10mV RL = 1k, VIN = ±10mV RL = 1k, VIN = ±10mV RL= 500Ω, VIN = ±10mV RL = 5k, VIN = ±10mV ±15V ±15V ±15V ±5V ±5V ±2.5V 13.3 13.2 10.0 3.3 3.2 1.1 ±V ±V ±V ±V ±V ±V IOUT Output Current VOUT = ±10V VOUT = ±3.2V ±15V ±5V 10.0 6.
PAGE 6
LT1351 U W TYPICAL PERFORMANCE CHARACTERISTICS 100 VS = ±15V IB+ + IB– IB = 2 INPUT VOLTAGE NOISE (nV/√Hz) 32 Open-Loop Gain vs Resistive Load 28 24 20 16 12 8 110 10 TA = 25°C TA = 25°C VS = ±15V AV = 101 RS = 100k INPUT CURRENT NOISE (pA/√Hz) INPUT BIAS CURRENT (nA) 36 Input Noise Spectral Density en 1 10 in VS = ±15V 100 OPEN-LOOP GAIN (dB) Input Bias Current vs Temperature 40 VS = ±5V 90 80 70 4 50 25 0 75 TEMPERATURE (°C) 100 125 1 10 1k 100 FREQUENCY (Hz) 1351 G04 Output
PAGE 7
LT1351 U W TYPICAL PERFORMANCE CHARACTERISTICS Gain and Phase vs Frequency 120 VS = ±5V 100 60 VS = ±5V 40 30 GAIN 20 20 10 0 0 –20 –10 –40 100M 1k 10k 100k 1M FREQUENCY (Hz) 10M 8 100 80 VS = ±15V PHASE (DEG) 40 TA = 25°C VS = ±15V 6 AV = 100 AV = 10 10 1 0.1 10k 1k 100k 1M FREQUENCY (Hz) 4.00 VS = ±5V 46 3 3.75 PHASE MARGIN 44 10M 42 3.25 40 38 2.00 –50 –25 5 TA = 25°C AV = 1 RL = 5k 3 2 1 0 –1 VS = ±5V 34 –3 32 –4 ±15V ±5V ±2.5V –2 3.75 44 3.
PAGE 8
LT1351 U W TYPICAL PERFORMANCE CHARACTERISTICS Slew Rate vs Supply Voltage TA = 25°C AV = –1 RF = RG = 5k SR = (SR+ + SR – )/2 Slew Rate vs Input Level 150 VS = ±15V 150 100 VS = ±5V 50 50 TA = 25°C VS = ±15V AV = –1 RFB = RG = 5k SR = (SR+ + SR – )/2 175 SLEW RATE (V/µs) 100 200 AV = –1 RF = RG = RL = 5k SR = (SR+ + SR – )/2 200 SLEW RATE (V/µs) 150 SLEW RATE (V/µs) Slew Rate vs Temperature 250 200 125 100 75 50 25 0 0 0 –50 –25 15 5 10 SUPPLY VOLTAGE (±V) 50 0 75 25 TEMPERATURE (°C)
PAGE 9
LT1351 U W TYPICAL PERFORMANCE CHARACTERISTICS Small-Signal Transient (AV = 1) Small-Signal Transient (AV = – 1) 1351 G31 Small-Signal Transient (AV = – 1, CL = 1000pF) 1351 G32 Large-Signal Transient (AV = 1) Large-Signal Transient (AV = – 1) 1351 G34 1351 G33 Large-Signal Transient (AV = 1, CL = 10,000pF) 1351 G35 1351 G36 U U W U APPLICATIONS INFORMATION The LT1351 may be inserted directly into many high speed amplifier applications improving both DC and AC performance, provided that the
PAGE 10
LT1351 U W U U APPLICATIONS INFORMATION noise gain is one and a large feedback resistor is used, CF should be greater than or equal to CIN. An example would be an I-to-V converter as shown in the Typical Applications section. Capacitive Loading The LT1351 is stable with any capacitive load. As the capacitive load increases, both the bandwidth and phase margin decrease so there will be peaking in the frequency domain and in the transient response.
PAGE 11
LT1351 U U W U APPLICATIONS INFORMATION resistive load) the network is incompletely bootstrapped and adds to the compensation at the high impedance node. The added capacitance slows down the amplifier and a zero is created by the RC combination, both of which improve the phase margin. The design ensures that even for very large load capacitances the total phase lag can never exceed 180 degrees (zero phase margin) and the amplifier remains stable.
PAGE 12
LT1351 U TYPICAL APPLICATIONS Shutdown Circuit 3 + 6 LT1351 2 1N4148 1M SHDN G S SST177 D – G 1M 5 S SST177 D V– 1351 TA04 DAC I-to-V Converter 10pF DAC INPUTS 12 5k – LT1351 565A TYPE V VOS + IOS (5kΩ) + OUT < 0.
PAGE 13
LT1351 U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. MS8 Package 8-Lead Plastic MSOP (LTC DWG # 05-08-1660) 0.118 ± 0.004* (3.00 ± 0.102) 8 7 6 5 0.118 ± 0.004** (3.00 ± 0.102) 0.192 ± 0.004 (4.88 ± 0.10) 1 2 3 0.040 ± 0.006 (1.02 ± 0.15) 0.007 (0.18) 4 0.034 ± 0.004 (0.86 ± 0.102) 0° – 6° TYP 0.021 ± 0.006 (0.53 ± 0.015) SEATING PLANE 0.012 (0.30) 0.0256 REF (0.65) TYP 0.006 ± 0.004 (0.15 ± 0.
PAGE 14
LT1351 U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. N8 Package 8-Lead PDIP (Narrow 0.300) (LTC DWG # 05-08-1510) 0.400* (10.160) MAX 8 7 6 5 1 2 3 4 0.255 ± 0.015* (6.477 ± 0.381) 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) ( +0.035 0.325 –0.015 8.255 +0.889 –0.381 ) 0.045 – 0.065 (1.143 – 1.651) 0.065 (1.651) TYP 0.100 ± 0.010 (2.540 ± 0.254) *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
PAGE 15
LT1351 U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. S8 Package 8-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) 0.189 – 0.197* (4.801 – 5.004) 8 7 6 5 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) 1 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 2 3 4 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0°– 8° TYP 0.016 – 0.050 0.406 – 1.270 0.014 – 0.019 (0.355 – 0.483) 0.050 (1.
PAGE 16
LT1351 U TYPICAL APPLICATION Low Power Sample-and-Hold – – LTC201 LT1351 VIN + LT1351 + VOUT 2000pF DROOP: 20nA/2000pF = 10mV/ms ACQUISITION TIME: 10V, 0.