Datasheet > LOG2112

LOG2112

更新时间： 2024-11-26 22:28:07

品牌	Logo	应用领域
德州仪器 - TI		放大器
页数	文件大小	规格书
16页	303K
描述
LOGARITHMIC AND LOG RATIO AMPLIFIERS

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LOG2112 数据手册

LOG112

LOG2112

SBOS246C – JUNE 2002 – REVISED APRIL 2003

Precision

LOGARITHMIC AND LOG RATIO AMPLIFIERS

FEATURES

DESCRIPTION

The LOG112 and LOG2112 are versatile integrated circuits

that compute the logarithm or log ratio of an input current

relative to a reference current. V_LOGOUTof the LOG112 and

LOG2112 are trimmed to 0.5V per decade of input current,

ensuring high precision over a wide dynamic range of input

signals.

● EASY-TO-USE COMPLETE FUNCTION

● OUTPUT SCALING AMPLIFIER

● ON-CHIP 2.5V VOLTAGE REFERENCE

● HIGH ACCURACY: 0.2% FSO Over 5 Decades

● WIDE INPUT DYNAMIC RANGE:

The LOG112 and LOG2112 features a 2.5V voltage refer-

ence that may be used to generate a precision current

reference using an external resistor.

7.5 Decades, 100pA to 3.5mA

● LOW QUIESCENT CURRENT: 1.75mA

● WIDE SUPPLY RANGE: ±4.5V to ±18V

● PACKAGES: SO-14 (narrow) and SO-16

Low DC offset voltage and temperature drift allow accurate

measurement of low-level signals over the specified tem-

perature range of –5°C to +75°C.

APPLICATIONS

● LOG, LOG RATIO:

Communication, Analytical, Medical, Industrial,

Test, General Instrumentation

● PHOTODIODE SIGNAL COMPRESSION AMP

● ANALOG SIGNAL COMPRESSION IN FRONT

OF ANALOG-TO-DIGITAL (A/D) CONVERTER

● ABSORBANCE MEASUREMENT

● OPTICAL DENSITY MEASUREMENT

R₁

R₂

V_LOGOUT= (0.5V)LOG (I₁/I₂)

C_C

V_O3= K (0.5V)LOG (I₁/I₂), K = 1 + R₂/R₁

+IN3

V+

–IN3

V_LOGOUT

I₁

LOG112

Q₁

Q₂

A₂

A₁

I₂

R_REF

A₃

V_O3

V_REF

GND

V_CM

V_{REF – GND}

V–

NOTE: Internal resistors are used to compensate gain change over temperature.

The V_CMpin is internally connected to GND in the LOG2112.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

www.ti.com

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