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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： | 17/18页 |
| 文件大小： | 490K |
| 代理商： | LOG102AIDR |
www.ti.com
LOG102
8
SBOS211B
FIGURE 10. Absorbance Measurement.
I
2
I
1
14
1
9
10
5
V
OUT
6
V+
V–
C
LOG102
D
2
D
1
Sample
λ
1
λ
1
λ
1
Light
Source
APPLICATION CIRCUITS
LOG RATIO
One of the more common uses of log ratio amplifiers is
to measure absorbance. A typical application is shown in
Figure 10.
Absorbance of the sample is A = log
λ
1/ λ1
(3)
If D1 and D2 are matched A ∝ (1V) logI1/I2
(4)
FIGURE 9. Reverse Biased Photodiode Using Pin 10 on
LOG102.
FIGURE 8. Precision Current Inverter/Current Source.
1.5k
+5V
1.5k
1.5k
100k
10nA to 1mA
LOG102
10nA to 1mA
100k
100k
+3.3V
1/2 OPA2335
Photodiode
Back Bias
Pin 1 or Pin 14
100k
I
1
Signal
C
(–V
RB)
I
2
REF
(–V
RB)
–V
RB
LOG102
6
9
10
14
15
V+
V
OUT
V–
DATA COMPRESSION
In many applications the compressive effects of the logarith-
mic transfer function are useful. For example, a LOG102
preceding a 12-bit Analog-to-Digital (A/D) converter can
produce the dynamic range equivalent to a 20-bit converter.
NOTES: (1) –V
RB, must be 2.5V more positive than V–. Example, for
V
RB = –9.5V, V– =12V. (2) Typically, –3.3V bias is used with ±12V supplies.
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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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