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| 型号： | LOG104AIDRE4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟运算功能 |
| 英文描述： | LOG OR ANTILOG AMPLIFIER, 0.01 MHz BAND WIDTH, PDSO8 |
| 封装： | ROHS COMPLIANT, PLASTIC, MS-012AA, SOIC-8 |
| 文件页数： | 11/13页 |
| 文件大小： | 244K |
| 代理商： | LOG104AIDRE4 |
www.ti.com
LOG104
7
SBOS243C
FIGURE 7. Precision Current Inverter/Current Source.
1.5k
Photodiode
10nA to 1mA
+5V
1.5k
+3.3V(1)
+3.3V)
1/2 OPA2335
OPA2335
1
2
BSH203
TLV271 or
(Back Bias
LOG104
Pin 1 or Pin 8
NOTE: (1) +3.3V bias is an arbitrary dc level < 5V that also
appears on the
IN through the op amp where it
applies a reverse bias to the photodiode.
OPERATION ON SINGLE SUPPLY
Many applications do not have the dual supplies required to
operate the LOG104. Figure 10 shows the LOG104 config-
ured for operation with a single +5V supply.
VOLTAGE INPUTS
The LOG104 gives the best performance with current inputs.
Voltage inputs may be handled directly with series resistors,
but the dynamic input range is limited to approximately three
decades of input voltage by voltage noise and offsets. The
transfer function of Equation (13) applies to this configuration.
FIGURE 8. Precision Current Inverter/Current Source.
1.5k
+5V
1.5k
1.5k
100k
10nA to 1mA
LOG104
10nA to 1mA
100k
100k
+3.3V(1)
1/2 OPA2335
Photodiode
Back Bias
Pin 1 or Pin 8
100k
NOTE: (1) +3.3V bias is an arbitrary dc level < 5V that also
appears on the
IN through the op amp where it
applies a reverse bias to the photodiode.
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 9.
Absorbance of the sample is A = log
λ
1/ λ1
(3)
If D1 and D2 are matched A ∝ (0.5V) logI1/I2
(4)
DATA COMPRESSION
In many applications the compressive effects of the logarith-
mic transfer function are useful. For example, a LOG104
preceding a 12-bit A/D converter can produce the dynamic
range equivalent to a 20-bit converter.
FIGURE 9. Absorbance Measurement.
I
2
I
1
8
1
5
6
3
V
OUT
4
V+
V–
C
LOG104
D
2
D
1
Sample
λ
1
λ
1
λ
1
Light
Source
8
1
3
6
4
5
1
2
35
4
–5V
1
F
LOG104
1
F
I
1
I
2
V
OUT
C
1
F
TPS(1)
Single Supply +5V
(1) TPS60402DBV negative charge pump.
FIGURE 10. Single +5V Power-Supply Operation.
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| LOG112 | 制造商:BB 制造商全称:BB 功能描述:Precision, High-Speed Transimpedance Amplifier |
| LOG112AID | 功能描述:对数放大器 Precision Log & 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 |
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| LOG112AIDE4 | 功能描述:对数放大器 Precision Log & 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 |
| LOG112AIDR | 功能描述:对数放大器 Precision Log & 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 |
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