Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsLinear ICsLinear IC - Op-amp Multi-purpose SO 8

LT1226

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Gain of 25 Stable

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1GHz Gain Bandwidth

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400V/µs Slew Rate

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2.6nV/√Hz Input Noise Voltage

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50V/mV Minimum DC Gain, R

= 500Ω

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1mV Maximum Input Offset Voltage

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±12V Minimum Output Swing into 500Ω

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Wide Supply Range ±2.5V to ±15V

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7mA Supply Current

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100ns Settling Time to 0.1%, 10V Step

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Drives All Capacitive Loads

ESCRIPTIO

The LT1226 is a low noise, very high speed operational

amplifier with excellent DC performance. The LT1226

features low input offset voltage and high DC gain. The

circuit is a single gain stage with outstanding settling

characteristics. The fast settling time makes the circuit an

ideal choice for data acquisition systems. The output is

capable of driving a 500Ω load to ±12V with ±15V supplies

and a 150Ω load to ±3V on ±5V supplies. The circuit is also

capable of driving large capacitive loads which makes it

useful in buffer or cable driver applications.

The LT1226 is a member of a family of fast, high per-

formance amplifiers that employ Linear Technology

Corporation’s advanced bipolar complementary

processing.

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Wideband Amplifiers

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Buffers

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Active Filters

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Video and RF Amplification

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Cable Drivers

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Data Acquisition Systems

ITY

Photodiode Preamplifier, A

= 5.1kΩ, BW = 15MHz Gain of +25 Pulse Response

Low Noise Very High Speed

Operational Amplifier

5.1k

LT1226 TA01

–

LT1226

51Ω

LT1226 TA02

Summary of content (8 pages)

PAGE 1
LT1226 Low Noise Very High Speed Operational Amplifier U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Gain of 25 Stable 1GHz Gain Bandwidth 400V/µs Slew Rate 2.6nV/√Hz Input Noise Voltage 50V/mV Minimum DC Gain, RL = 500Ω 1mV Maximum Input Offset Voltage ±12V Minimum Output Swing into 500Ω Wide Supply Range ±2.5V to ±15V 7mA Supply Current 100ns Settling Time to 0.
PAGE 2
LT1226 PACKAGE/ORDER I FOR ATIO U W W W Total Supply Voltage (V+ to V –) ............................... 36V Differential Input Voltage ......................................... ±6V Input Voltage ............................................................±VS Output Short Circuit Duration (Note 1) ............ Indefinite Operating Temperature Range LT1226C ................................................ 0°C to 70°C Maximum Junction Temperature Plastic Package ..........................................
PAGE 3
LT1226 ELECTRICAL CHARACTERISTICS VS = ±5V, TA = 25°C, VCM = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage (Note 2) IOS Input Offset Current IB Input Bias Current MIN Input Voltage Range + 2.5 Input Voltage Range – TYP MAX 1.0 1.4 mV 100 400 nA 4 8 µA 4 UNITS V –3 –2.5 V CMRR Common-Mode Rejection Ratio VCM = ±2.5V 94 103 dB AVOL Large Signal Voltage Gain VOUT = ±2.5V, RL = 500Ω VOUT = ±2.
PAGE 4
LT1226 U W TYPICAL PERFOR A CE CHARACTERISTICS Input Common Mode Range vs Supply Voltage 8.0 20 10 +VCM –VCM 5 OUTPUT VOLTAGE SWING (V) 15 7.5 7.0 6.5 6.0 0 5 0 10 15 5 0 20 10 15 Output Voltage Swing vs Resistive Load 15 10 VS = ±5V 0 100 1k 4.5 110 3.5 –5 0 5 10 5 125 2 4.5 4.25 4.0 TEMPERATURE (°C) 3.
PAGE 5
LT1226 U W TYPICAL PERFOR A CE CHARACTERISTICS Power Supply Rejection Ratio vs Frequency Input Noise Spectral Density 1.0 0.1 10 en 1 100 10 1k 100 80 –PSRR +PSRR 60 40 0 100 0.
PAGE 6
LT1226 U W U UO APPLICATI S I FOR ATIO The LT1226 may be inserted directly into HA2541, HA2544, AD847, EL2020 and LM6361 applications, provided that the amplifier configuration is a noise gain of 25 or greater, and the nulling circuitry is removed. The suggested nulling circuit for the LT1226 is shown below. Small Signal, AV = +25 Small Signal, AV = – 25 Offset Nulling V+ 5k 1 3 + 8 7 LT1226 2 – 6 4 0.
PAGE 7
LT1226 W U U UO APPLICATI S I FOR ATIO frequency domain and in the transient response. The photo of the small signal response with 1000pF load shows 55% peaking. The large signal response with a 10,000pF load shows the output slew rate being limited by the short circuit current. AV = –25, CL = 1000pF AV = +25, CL = 10,000pF LT1226 AI04 The LT1226 can drive coaxial cable directly, but for best pulse fidelity the cable should be doubly terminated with a resistor in series with the output.
PAGE 8
LT1226 W W SI PLIFIED SCHE ATIC V+ 7 NULL 1 8 BIAS 1 +IN 3 BIAS 2 2 –IN 6 V– OUT 4 LT1226 SS U PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted. N8 Package 8-Lead Plastic DIP 0.300 – 0.320 (7.620 – 8.128) 0.065 (1.651) TYP 0.130 ± 0.005 (3.302 ± 0.127) 0.045 – 0.065 (1.143 – 1.651) 8 0.009 - 0.015 (0.229 - 0.381) +0.025 0.325 –0.015 ( +0.635 8.255 –0.381 0.125 (3.175) MIN 0.045 ± 0.015 (1.143 ± 0.381) ) 0.400 (10.160) MAX 0.100 ± 0.010 (2.540 ± 0.