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參數(shù)資料
| 型號： | LOG112 |
| 元件分類： | 跨阻放大器 |
| 英文描述： | Precision, High-Speed Transimpedance Amplifier |
| 中文描述： | 精密，高速互阻抗放大器 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大?。?/td> | 362K |
| 代理商： | LOG112 |
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SBOS291E NOVEMBER 2003 REVISED NOVEMBER 2004
www.ti.com
13
110
80
50
20
10
Frequency (Hz)
T
100
10k
1k
1M
10M
100k
100M
3dB BW at 1MHz
See Figure 6a
C
DIODE
= 10pF
See Figure 6c
See Figure 6b
Figure 7. Transimpedance gains for circuits in
Figure 6
The effect of these circuit configurations on output noise
is shown in Figure 8 and on integrated output noise in
Figure 9. A 2-pole Butterworth filter (maximally flat in
passband) is created by selecting the filter values using
the equation:
C
F
R
F
2C
FILTER
R
FILTER
with:
f
3dB
1
2
R
F
R
FILTER
C
F
C
FILTER
The circuit in Figure 6b rolls off at 20dB/decade. The
circuit with the additional filter shown in Figure 6c rolls
off at 40dB/decade, resulting in improved noise
performance.
300
200
100
0
Frequency (Hz)
O
√
H
C
DIODE
= 10pF
See Figure 6a
See Figure 6b
See Figure 6c
1
100
10
10k
1k
1M
10M
100k
100M
Figure 8. Output noise for circuits in Figure 6
500
400
300
200
100
0
Frequency (Hz)
1
100
10
10k
1k
1M
10M
100k
100M
419
μ
V
30
μ
V
86
μ
V
C
DIODE
= 10pF
SeeFigure 6a
See Figure 6b
See Figure 6c
I
μ
V
Figure 9. Integrated output noise for circuits in
Figure 6
Figure 10 shows the effect of diode capacitance on
integrated output noise, using the circuit in Figure 6c.
For additional information, refer to
Noise Analysis of
FET Transimpedance Amplifiers
(SBOA060), and
Noise Analysis for High Speed Op Amps
(SBOA066),
available for download from the TI web site.
80
60
0
20
0
Frequency (Hz)
1
100
10
10k
1k
1M
10M
100k
100M
C
= 100pF
C
= 10pF
C
= 1pF
See Figure6c
C
= 50pF
50
μ
V
35
μ
V
30
μ
V
27
μ
V
79
μ
V
C
= 20pF
I
μ
V
Figure 10. Integrated output noise for various
values of C
DIODE
for circuit in Figure 6c
(4)
(5)
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| LOG112AID | 功能描述:對數(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 |
| LOG112AIDR | 功能描述:對數(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 |
| LOG112AIDRE4 | 功能描述:對數(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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