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| 型号： | LOG102AIDR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟运算功能 |
| 英文描述： | LOG OR ANTILOG AMPLIFIER, 1.4 MHz BAND WIDTH, PDSO14 |
| 封装： | GREEN, PLASTIC, MS-012AB, SOIC-14 |
| 文件页数： | 1/18页 |
| 文件大小： | 490K |
| 代理商： | LOG102AIDR |
FEATURES
q EASY-TO-USE COMPLETE LOG RATIO FUNCTION
q OUTPUT AMPLIFIERS FOR SCALING AND
SIGNAL LOSS INDICATION
q HIGH ACCURACY: 0.15% FSO Total Error Over
6 Decades
q WIDE INPUT DYNAMIC RANGE:
6 Decades, 1nA to 1mA
q LOW QUIESCENT CURRENT: 1.25mA
q SO-14 PACKAGE
Precision
LOGARITHMIC AND LOG RATIO AMPLIFIER
DESCRIPTION
The LOG102 is a versatile integrated circuit that computes
the logarithm or log ratio of an input current relative to a
reference current.
The LOG102 is tested over a wide dynamic range of input
signals. In log ratio applications, a signal current can be
generated by a photodiode, and a reference current from a
resistor in series with a precision external voltage reference.
In the block diagram shown below, A3 and A4 are identical,
uncommitted op amps that can be used for a variety of
functions, such as filtering, offsetting, adding gain or as a
comparator to detect loss of signal.
The output signal at VLOG OUT is trimmed to 1V per decade of
input current. It can be scaled with an output amplifier, either
A3 or A4.
Low dc offset voltage and temperature drift allow accurate
measurement of low-level signals over a wide environmental
temperature range. The LOG102 is specified over the tem-
perature range, 0
°C to +70°C, with operation over –40°C to
+85
°C.
APPLICATIONS
q ONET, OPTICAL POWER METERS
q LOG, LOG RATIO COMPUTATION:
Communication, Analytical, Medical, Industrial,
Test, General Instrumentation
q PHOTODIODE SIGNAL COMPRESSION AMP
q ANALOG SIGNAL COMPRESSION IN FRONT
OF A/D CONVERTER
q ABSORBANCE MEASUREMENT
q OPTICAL DENSITY MEASUREMENT
LOG102
www.ti.com
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 2001-2005, Texas Instruments Incorporated
SBOS211B – DECEMBER 2001– REVISED APRIL 2005
A
2
A
3
A
1
I
1
Q
1
Q
2
VOUT3
A
4
VOUT4
+IN4
–IN4
–IN3
+IN3
V
LOG OUT
V
LOG OUT = LOG (I1/I2)
V
OUT3 = G LOG (I1/I2), G = 1 +R2/R1
R
1
R
2
C
I
2
A4 can be used
as comparator for
signal loss detect.
V–
V+
614
1
911
4
7
12
8
3
5
10
GND
NOTE: U.S. Patent Pending.
LOG1
02
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.
All trademarks are the property of their respective owners.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LOG102AIDRG4 | 功能描述:对数放大器 Logarithmic and Log Ratio Amp RoHS:否 制造商:Texas Instruments 通道数量:3 带宽:3 dB 共模抑制比（最小值）: 输入补偿电压:+/- 7 mV 输入电压范围（最大值）:5.5 V 工作电源电压:4.5 V to 5.5 V 电源电流:+/- 15 mA 工作温度范围:- 40 C to +85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| LOG104 | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOGARITHMIC AND LOG RATIO AMPLIFIER |
| LOG104AID | 功能描述:对数放大器 LOGARITHMIC AMP RoHS:否 制造商:Texas Instruments 通道数量:3 带宽:3 dB 共模抑制比（最小值）: 输入补偿电压:+/- 7 mV 输入电压范围（最大值）:5.5 V 工作电源电压:4.5 V to 5.5 V 电源电流:+/- 15 mA 工作温度范围:- 40 C to +85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| LOG104AID | 制造商:Texas Instruments 功能描述:IC AMP LOG SMD SOIC8 104 |
| LOG104AIDE4 | 功能描述:对数放大器 LOGARITHMIC AMP RoHS:否 制造商:Texas Instruments 通道数量:3 带宽:3 dB 共模抑制比（最小值）: 输入补偿电压:+/- 7 mV 输入电压范围（最大值）:5.5 V 工作电源电压:4.5 V to 5.5 V 电源电流:+/- 15 mA 工作温度范围:- 40 C to +85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
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