Datasheet

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LT1357

25MHz, 600V/µs Op Amp

TYPICAL APPLICATION

DAC I-to-V Converter

= –1 Large-Signal Response

1357 TA02

1357 TA01

0.1µF5k

6pF

OUT

565A-TYPE

DAC

INPUTS

–

LT1357

■

25MHz Gain Bandwidth

■

600V/µs Slew Rate

■

2.5mA Maximum Supply Current

■

Unity-Gain Stable

■

C-Load

Op Amp Drives All Capacitive Loads

■

8nV/√Hz Input Noise Voltage

■

600µV Maximum Input Offset Voltage

■

500nA Maximum Input Bias Current

■

120nA Maximum Input Offset Current

■

20V/mV Minimum DC Gain, R

=1k

■

115ns Settling Time to 0.1%, 10V Step

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220ns Settling Time to 0.01%, 10V Step

■

±12V Minimum Output Swing into 500Ω

■

±2.5V Minimum Output Swing into 150Ω

■

Specified at ±2.5V, ±5V, and ±15V

The LT

1357 is a high speed, very high slew rate opera-

tional amplifier with outstanding AC and DC performance.

The LT1357 has much lower supply current, lower input

offset voltage, lower input bias current, and higher DC gain

than devices with comparable bandwidth. The circuit

topology is a voltage feedback amplifier with the

slewing characteristics of a current feedback amplifier.

The amplifier is a single gain stage with outstanding

settling characteristics which makes the circuit an ideal

choice for data acquisition systems. The output drives a

500Ω load to ±12V with ±15V supplies and a 150Ω

load to ±2.5V on ±5V supplies. The amplifier is also

stable with any capacitive load which makes it useful in

buffer or cable driver applications.

The LT1357 is a member of a family of fast, high perfor-

mance amplifiers using this unique topology and employ-

ing Linear Technology Corporation’s advanced bipolar

complementary processing. For dual and quad amplifier

versions of the LT1357 see the LT1358/LT1359 data

sheet. For higher bandwidth devices with higher supply

current see the LT1360 through LT1365 data sheets. For

lower supply current amplifiers see the LT1354 and LT1355/

LT1356 data sheets. Singles, duals, and quads of each

amplifier are available.

FEATURES

DESCRIPTION

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

C-Load is a trademark of Linear Technology Corporation

■

Wideband Amplifiers

■

Buffers

■

Active Filters

■

Data Acquisition Systems

■

Photodiode Amplifiers

APPLICATIONS

VIk

LSB

OS OS

OUT

VOL

()

+<51Ω

Summary of content (12 pages)

PAGE 1
LT1357 25MHz, 600V/µs Op Amp U DESCRIPTION FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ The LT ®1357 is a high speed, very high slew rate operational amplifier with outstanding AC and DC performance. The LT1357 has much lower supply current, lower input offset voltage, lower input bias current, and higher DC gain than devices with comparable bandwidth. The circuit topology is a voltage feedback amplifier with the slewing characteristics of a current feedback amplifier.
PAGE 2
LT1357 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
LT1357 ELECTRICAL CHARACTERISTICS TA = 25°C, VCM = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS VSUPPLY MIN TYP MAX UNITS VOUT Output Swing RL = 1k, VIN = ±40mV RL = 500Ω, VIN = ±40mV RL = 500Ω, VIN = ±40mV RL = 150Ω, VIN = ±40mV RL = 500Ω, VIN = ±40mV ±15V ±15V ±5V ±5V ±2.5V 13.3 12.0 3.5 2.5 1.3 13.8 12.8 4.0 3.3 1.7 ±V ±V ±V ±V ±V IOUT Output Current VOUT = ±12V VOUT = ±2.5V ±15V ±5V 24.0 16.
PAGE 4
LT1357 ELECTRICAL CHARACTERISTICS 0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS VSUPPLY MIN TYP MAX UNITS VOUT Output Swing RL = 1k, VIN = ±40mV RL = 500Ω, VIN = ±40mV RL = 500Ω, VIN = ±40mV RL = 150Ω, VIN = ±40mV RL = 500Ω, VIN = ±40mV ±15V ±15V ±5V ±5V ±2.5V ● ● ● ● ● 13.2 11.5 3.4 2.3 1.2 ±V ±V ±V ±V ±V IOUT Output Current VOUT = ±11.5V VOUT = ±2.3V ±15V ±5V ● ● 23.0 15.
PAGE 5
LT1357 ELECTRICAL CHARACTERISTICS The ● denotes specifications that apply over the full specified temperature range. Note 1: Differential inputs of ±10V are appropriate for transient operation only, such as during slewing. Large, sustained differential inputs will cause excessive power dissipation and may damage the part. See Input Considerations in the Applications Information section of this data sheet for more details.
PAGE 6
LT1357 U W TYPICAL PERFORMANCE CHARACTERISTICS Output Voltage Swing vs Supply Voltage Open-Loop Gain vs Temperature V + –0.5 V+ TA = 25°C RL = 1k VO = ±12V VS = ±15V 99 98 97 96 95 –2 RL = 500Ω –3 3 RL = 500Ω 2 1 94 93 –50 V –25 0 25 50 75 TEMPERATURE (°C) 100 0 2.5 –40°C 1.5 V – +0.
PAGE 7
LT1357 U W TYPICAL PERFORMANCE CHARACTERISTICS Gain-Bandwidth and Phase Margin vs Temperature PHASE MARGIN VS = ±5V 4 46 3 44 42 30 40 28 GAIN-BANDWIDTH VS = ±15V 26 24 22 GAIN-BANDWIDTH VS = ±5V 20 18 –50 –25 0 25 50 75 TEMPERATURE (°C) 100 38 36 5 TA = 25°C AV = 1 RL = 2k 2 1 0 –1 ±5V –2 –3 32 –4 30 125 3 ±15V 2 34 ±2.
PAGE 8
LT1357 U W TYPICAL PERFORMANCE CHARACTERISTICS 0.01 30 0.001 AV = 1 AV = 1 20 15 10 5 1k 10k FREQUENCY (Hz) VS = ±15V RL = 2k AV = 1, 1% MAX DISTORTION AV = –1, 2% MAX DISTORTION 0 100k 100k 1M FREQUENCY (Hz) DIFFERENTIAL PHASE (DEGREES) HARMONIC DISTORTION (dB) –60 –70 2ND HARMONIC –80 –90 100k 200k 400k 1M 2M FREQUENCY (Hz) 4M 10M DIFFERENTIAL GAIN 0.10 0.05 0.50 DIFFERENTIAL PHASE 0.45 0.40 0.
PAGE 9
LT1357 U W TYPICAL PERFORMANCE CHARACTERISTICS Large-Signal Transient (AV = 1) Large-Signal Transient (AV = 1, CL = 10,000pF) Large-Signal Transient (AV = –1) 1357 TA34 1357 TA35 1357 TA36 U U W U APPLICATIONS INFORMATION The LT1357 may be inserted directly into many high speed amplifier applications improving both DC and AC performance, provided that the nulling circuitry is removed. The suggested nulling circuit for the LT1357 is shown below.
PAGE 10
LT1357 U W U U APPLICATIONS INFORMATION series with the output. The other end of the cable should be terminated with the same value resistor to ground. Input Considerations Each of the LT1357 inputs is the base of an NPN and a PNP transistor whose base currents are of opposite polarity and provide first-order bias current cancellation. Because of variation in the matching of NPN and PNP beta, the polarity of the input bias current can be positive or negative.
PAGE 11
LT1357 U U W U APPLICATIONS INFORMATION has no effect under normal operation. When driving a capacitive load (or a low value resistive load) the network is incompletely bootstrapped and adds to the compensation at the high impedance node. The added capacitance slows down the amplifier which improves the phase margin by moving the unity-gain frequency away from the pole formed by the output impedance and the capacitive load.
PAGE 12
LT1357 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) 0.010 – 0.020 × 45° (0.254 – 0.508) 8 0.053 – 0.069 (1.346 – 1.752) 0.008 – 0.010 (0.203 – 0.254) 5 6 0.004 – 0.010 (0.101 – 0.254) 0°– 8° TYP 0.016 – 0.050 0.406 – 1.270 7 0.014 – 0.019 (0.355 – 0.483) 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) 0.050 (1.