參數(shù)資料
型號： LOG114AIRGVRG4
元件分類： 對數(shù)放大器
英文描述： Single-Supply, High-Speed, Precision LOGARITHMIC AMPLIFIER
中文描述： 單電源，高速，精密對數(shù)放大器
文件頁數(shù)： 18/30頁
文件大?。?/td> 616K
代理商： LOG114AIRGVRG4
"#$$%
SBOS301A MAY 2004 REVISED MARCH 2007
www.ti.com
18
VOLTAGE INPUTS
The LOG114 provides the best performance with cur-
rent inputs. Voltage inputs may be handled directly by
using a low-impedance voltage source with series resis-
tors, but the dynamic input range is limited to approxi-
mately three decades of input voltage. This limitation
exists because of the magnitude of the required input
voltage and size of the corresponding series resistor.
For 10nA of input current, a 10V voltage source and a
1G
resistor would be required. Voltage and current
noise from these sources must be considered and can
limit the usefulness of this technique.
APPLICATION CIRCUITS
LOG RATIO
One of the more common uses of log ratio amplifiers is
to measure absorbance. See Figure 10 for a typical ap-
plication. Absorbance of the sample is A = log
λ
1
′/λ
1
. If
D
1
and D
2
are matched, A
∝
(0.375V) log(I
1
/I
2
).
I
2
I
1
D
2
D
1
Sample
λ
1
′
λ
1
λ
1
Light
Source
Q
1
R
1
R
2
R
5
R
6
LOG114
R
3
R
4
V
O4(2)
IN
4
+IN
4
V
LOGOUT(1)
+IN
5
IN
5
V
O5
V
CM IN
I
1
4
10
10
9
14
5
3
15
13
12
16
V
REF
2.5V
REF
V
V
REF GND
Q
2
A
3
A
1
A
2
A
4
A
5
I
2
V+
1
8
6
7
Com
+5V
NOTES: (1) V
LOGOUT
= 0.375
×
log(I
1
/I
2
).
(2) V
= 0.375
×
K
×
log(I
1
/I
2
)
K = 1 + R
6
/R
5
.
Figure 10. Using the LOG114 to Measure Absorbance.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LOG114AIRGVT 功能描述:對數(shù)放大器 Precision High-Speed 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
LOG114AIRGVTG4 功能描述:對數(shù)放大器 Prec High-Speed 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
LOG114EVM 功能描述:放大器 IC 開發(fā)工具 LOG114 Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V
LOG1527 制造商:未知廠家 制造商全稱:未知廠家 功能描述:由CMOS工藝設(shè)計(jì)制造的可內(nèi)燒的學(xué)習(xí)碼編碼IC.
LOG2112 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOGARITHMIC AND LOG RATIO AMPLIFIERS
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