參數(shù)資料
型號(hào)： LOG104AIDR
廠商： Texas Instruments, Inc.
英文描述： LOGARITHMIC AND LOG RATIO AMPLIFIER
中文描述： 對(duì)數(shù)和對(duì)數(shù)比率放大器
文件頁(yè)數(shù)： 7/13頁(yè)
文件大?。?/td> 273K
代理商： LOG104AIDR
www.ti.com
LOG104
SBOS243B
7
FIGURE 7. Precision Current Inverter/Current Source.
1.5k
Photodiode
10nA to 1mA
Pin 1 or Pin 8
10nA to 1mA
+5V
+5V
1.5k
+3.3V
+3.3V
1/2 OPA2335
1/2 OPA2335
OPA2335
1
2
BSH203
TLV271 or
Back Bias
LOG104
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
+5V
1.5k
1.5k
100k
10nA to 1mA
Back Bias
LOG104
10nA to 1mA
Pin 1 or Pin 8
100k
100k
+3.3V
+3.3V
1/2 OPA2335
1/2 OPA2335
Photodiode
100k
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
′
/
λ
1
(3)
If D
1
and D
2
are matched A
∝
(0.5V) logI
1
/I
2
(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
C
LOG104
D
2
D
1
Sample
λ
1
λ
1
′
λ
1
Light
Source
8
1
3
6
4
5
1
2
3
5
4
–
5V
1
μ
F
LOG104
1
μ
F
I
1
I
2
V
OUT
C
C
1
μ
F
TPS
(1)
Single Supply +5V
(1) TPS60402DBV negative charge pump.
FIGURE 10. Single +5V Power-Supply Operation.
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LOG104AIDRE4 功能描述:對(duì)數(shù)放大器 LOGARITHMIC AMP RoHS:否 制造商:Texas Instruments 通道數(shù)量:3 帶寬:3 dB 共模抑制比（最小值）: 輸入補(bǔ)償電壓:+/- 7 mV 輸入電壓范圍（最大值）:5.5 V 工作電源電壓:4.5 V to 5.5 V 電源電流:+/- 15 mA 工作溫度范圍:- 40 C to +85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel
LOG112 制造商:BB 制造商全稱:BB 功能描述:Precision, High-Speed Transimpedance Amplifier
LOG112AID 功能描述:對(duì)數(shù)放大器 Precision Log & Log Ratio Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:3 帶寬:3 dB 共模抑制比（最小值）: 輸入補(bǔ)償電壓:+/- 7 mV 輸入電壓范圍（最大值）:5.5 V 工作電源電壓:4.5 V to 5.5 V 電源電流:+/- 15 mA 工作溫度范圍:- 40 C to +85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel
LOG112AID 制造商:Texas Instruments 功能描述:IC AMP LOG SMD SOIC14 112
LOG112AIDE4 功能描述:對(duì)數(shù)放大器 Precision Log & Log Ratio Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:3 帶寬:3 dB 共模抑制比（最小值）: 輸入補(bǔ)償電壓:+/- 7 mV 輸入電壓范圍（最大值）:5.5 V 工作電源電壓:4.5 V to 5.5 V 電源電流:+/- 15 mA 工作溫度范圍:- 40 C to +85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel
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