Datasheet

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LT1354

12MHz, 400V/µs Op Amp

TYPICAL APPLICATION

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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

APPLICATIONS

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12MHz Gain-Bandwidth

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400V/µs Slew Rate

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1.25mA Maximum Supply Current

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Unity Gain Stable

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C-Load

Op Amp Drives All Capacitive Loads

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10nV/√Hz Input Noise Voltage

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800µV Maximum Input Offset Voltage

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300nA Maximum Input Bias Current

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70nA Maximum Input Offset Current

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12V/mV Minimum DC Gain, R

=1k

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230ns Settling Time to 0.1%, 10V Step

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280ns Settling Time to 0.01%, 10V Step

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±12V Minimum Output Swing into 500Ω

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±2.5V Minimum Output Swing into 150Ω

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Specified at ±2.5V, ±5V, and ±15V

The LT

1354 is a low power, high speed, high slew rate

operational amplifier with outstanding AC and DC perfor-

mance. The LT1354 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 LT1354 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 LT1354 see the LT1355/LT1356 data

sheet. For higher bandwidth devices with higher supply

current see the LT1357 through LT1365 data sheets.

Singles, duals, and quads of each amplifier are available.

FEATURES

DESCRIPTION

1354 TA01

5.23k

10.2k

47pF

6.81k

100pF

1000pF

OUT

–

5.23k

11.3k6.81k

330pF

LT1354

= –1 Large-Signal Response

1354 TA02

100kHz, 4th Order Butterworth Filter

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

C-Load is a trademark of Linear Technology Corporation

Downloaded from Arrow.com.

Summary of content (12 pages)

PAGE 1
LT1354 12MHz, 400V/µs Op Amp U DESCRIPTION FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ The LT ®1354 is a low power, high speed, high slew rate operational amplifier with outstanding AC and DC performance. The LT1354 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
LT1354 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
LT1354 ELECTRICAL CHARACTERISTICS TA = 25°C, VCM = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS VSUPPLY MIN TYP 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 12.5 4.0 3.1 1.7 ±V ±V ±V ±V ±V IOUT Output Current VOUT = ±12V VOUT = ±2.5V ±15V ±5V 24.0 16.
PAGE 4
LT1354 ELECTRICAL CHARACTERISTICS 0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS VSUPPLY 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 MIN TYP MAX UNITS ±V ±V ±V ±V ±V IOUT Output Current VOUT = ±11.5V VOUT = ±2.3V ±15V ±5V ● ● 23.0 15.
PAGE 5
LT1354 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 dutails.
PAGE 6
LT1354 U W TYPICAL PERFORMANCE CHARACTERISTICS Output Voltage Swing vs Supply Voltage Open-Loop Gain vs Temperature V + – 0.
PAGE 7
LT1354 U W TYPICAL PERFORMANCE CHARACTERISTICS Gain-Bandwidth and Phase Margin vs Temperature PHASE MARGIN VS = ±5V 15 4 48 3 46 14 44 13 42 GAIN-BANDWIDTH VS = ±15V 12 40 11 38 10 GAIN-BANDWIDTH VS = ±5V 9 8 –50 –25 0 25 50 75 TEMPERATURE (°C) 100 5 TA = 25°C AV = 1 RL = 2k 3 2 2 ±15V 1 0 –1 ±5V –2 36 –3 34 –4 –3 10M 1M FREQUENCY (Hz) 100M C = 500pF 2 C = 100pF 0 C = 50pF –2 C=0 –4 –6 –8 –10 100k 1M 10M FREQUENCY (Hz) 120 VS = ±15V TA = 25°C 80 +PSRR –PSRR 6
PAGE 8
LT1354 U W TYPICAL PERFORMANCE CHARACTERISTICS Total Harmonic Distortion vs Frequency Undistorted Output Swing vs Frequency (±15V) 30 TA = 25°C VO = 3VRMS RL = 2k OUTPUT VOLTAGE (VP-P) AV = –1 0.001 AV = 1 100 AV = –1 25 0.01 0.0001 10 10 20 AV = 1 15 10 5 VS = ±15V RL = 5k AV = 1, 1% MAX DISTORTION AV = –1, 4% MAX DISTORTION 0 100k 100k 1k 10k FREQUENCY (Hz) OUTPUT VOLTAGE (VP-P) 0.
PAGE 9
LT1354 U W TYPICAL PERFORMANCE CHARACTERISTICS Large-Signal Transient (AV = 1) Large-Signal Transient (AV = 1, CL = 10,000pF) Large-Signal Transient (AV = –1) 1354 TA34 1354 TA35 1354 TA36 U U W U APPLICATIONS INFORMATION The LT1354 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 LT1354 is shown below.
PAGE 10
LT1354 U W U U APPLICATIONS INFORMATION Input Considerations Each of the LT1354 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. The offset current does not depend on NPN/PNP beta matching and is well controlled.
PAGE 11
LT1354 U U W U APPLICATIONS INFORMATION 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. The zero created by the RC combination adds phase to ensure 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
LT1354 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 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) 0.050 (1.270) TYP 0.014 – 0.019 (0.355 – 0.