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參數(shù)資料
| 型號： | LOG2112AIDWRE4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬運算功能 |
| 英文描述： | LOG OR ANTILOG AMPLIFIER, PDSO16 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MS-013AA, SOIC-16 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大小： | 621K |
| 代理商： | LOG2112AIDWRE4 |
LOG112
LOG2112
SBOS246D – JUNE 2002 – REVISED APRIL 2005
www.ti.com
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. VLOGOUT of 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.
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.
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.
FEATURES
q EASY-TO-USE COMPLETE FUNCTION
q OUTPUT SCALING AMPLIFIER
q ON-CHIP 2.5V VOLTAGE REFERENCE
q HIGH ACCURACY: 0.2% FSO Over 5 Decades
q WIDE INPUT DYNAMIC RANGE:
7.5 Decades, 100pA to 3.5mA
q LOW QUIESCENT CURRENT: 1.75mA
q WIDE SUPPLY RANGE:
±4.5V to ±18V
q PACKAGES: SO-14 (narrow) and SO-16
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.
Copyright 2002-2005, Texas Instruments Incorporated
Precision
LOGARITHMIC AND LOG RATIO AMPLIFIERS
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.
APPLICATIONS
q LOG, LOG RATIO:
Communication, Analytical, Medical, Industrial,
Test, General Instrumentation
q PHOTODIODE SIGNAL COMPRESSION AMP
q ANALOG SIGNAL COMPRESSION IN FRONT
OF ANALOG-TO-DIGITAL (A/D) CONVERTER
q ABSORBANCE MEASUREMENT
q OPTICAL DENSITY MEASUREMENT
LOG1
12
LOG2
112
A
2
A
1
Q
1
Q
2
C
I
1
V
REF – GND
NOTE: Internal resistors are used to compensate gain change over temperature.
The V
CM pin is internally connected to GND in the LOG2112.
V
O3
V+
GND
LOG112
V
LOGOUT = (0.5V)LOG (I1/I2)
V
O3 = K (0.5V)LOG (I1/I2), K = 1 + R2/R1
A
3
R
2
R
1
V
REF
R
REF
+IN3
V
LOGOUT
–IN3
V–
V
CM
I
2
V
REF
All trademarks are the property of their respective owners.
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