Datasheet > LT1793

LT1793

更新时间： 2023-12-20 18:46:33

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亚德诺 - ADI		放大器运算放大器
页数	文件大小	规格书
12页	171K
描述
低噪声、微微安偏置电流、JFET 输入运算放大器

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LT1793 数据手册

LT1793

Low Noise,

Picoampere Bias Current,

JFET Input Op Amp

FEATURES

DESCRIPTIO

The LT^®1793 achieves a new standard of excellence in

noiseperformanceforaJFETopamp.Forthefirsttimelow

voltage noise (6nV/√Hz) is simultaneously offered with

extremely low current noise (0.8fA/√Hz), providing the

lowest total noise for high impedance transducer applica-

tions. Unlike most JFET op amps, the very low input bias

current (3pA typ) is maintained over the entire common

moderangewhichresultsinanextremelyhighinputresis-

tance (10¹³Ω). When combined with a very low input ca-

pacitance (1.5pF) an extremely high input impedance

results, making the LT1793 the first choice for amplifying

low level signals from high impedance transducers. The

lowinputcapacitancealsoassureshighgainlinearitywhen

buffering AC signals from high impedance transducers.

■

Input Bias Current, Warmed Up: 10pA Max

■

100% Tested Low Voltage Noise: 8nV/√Hz Max

■

A Grade 100% Temperature Tested

■

Offset Voltage Over Temp: 1mV Max

Input Resistance: 10¹³Ω

■

Very Low Input Capacitance: 1.5pF

■

Voltage Gain: 1 Million Min

■

Gain-Bandwidth Product: 4.2MHz Typ

■

Guaranteed Specifications with ±5V Supplies

APPLICATIO S

■

Photocurrent Amplifiers

■

Hydrophone Amplifiers

■

High Sensitivity Piezoelectric Accelerometers

TheLT1793isunconditionallystableforgainsof1ormore,

even with 1000pF capacitive loads. Other key features are

250µV V_OSand a voltage gain over 4 million. Each indi-

vidual amplifier is 100% tested for voltage noise, slew rate

(3.4V/µs) and gain-bandwidth product (4.2MHz).

■

Low Voltage and Current Noise Instrumentation

Amplifier Front Ends

■

Two and Three Op Amp Instrumentation Amplifiers

■

Active Filters

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

Specifications at ±5V supply operation are also provided.

ForanevenlowervoltagenoisepleaseseetheLT1792data

sheet.

TYPICAL APPLICATIO

Low Noise Light Sensor with DC Servo

2pF

1kHz Output Voltage Noise

Density vs Source Resistance

10k

–

100

LT1793

OUT

SOURCE

C2 0.022µF

1N914

–

100k

–

1N914

2N3904

LT1097

SOURCE

= 25°C

= ±15V

RESISTANCE

ONLY

HAMAMATSU

S1336-5BK

(908) 231-0960

10k 1k

100

1k 10k 100k 1M 10M

100M

–

1793 TA01

R2C2 > C1R1

SOURCE RESISTANCE (Ω)

= PARASITIC PHOTODIODE CAPACITANCE

= 100mV/µWATT FOR 200nm WAVE LENGTH

OUT

–

√

OP AMP

)

+ 4kTR + 2qI R

330mV/µWATT FOR 633nm WAVE LENGTH

1793 TA02

12 3 4 5 6 7...12

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