參數(shù)資料
型號(hào)： OPA728
英文描述： 20MHz, High Precision CMOS Operational Amplifier
中文描述： 為20MHz，高精度CMOS運(yùn)算放大器
文件頁(yè)數(shù)： 13/20頁(yè)
文件大?。?/td> 537K
代理商： OPA728
"#"$
%"#"$
#"#"
"#&
SBOS314B SEPTEMBER 2004 REVISED DECEMBER 2004
www.ti.com
13
To achieve a maximally-flat, 2nd-order Butterworth
frequency response, the feedback pole should be set to:
1
2 R
F
C
F
GBW
4 R
F
C
D
Bandwidth is calculated by:
f
3dB
GBW
2 R
F
C
D
Hz
For even higher transimpedance bandwidth, the
high-speed CMOS OPA380 (90MHz GBW), OPA354
(100MHz GBW), OPA300 (180 MHz GBW), OPA355
(200MHz GBW), or OPA656, OPA657 (400MHz GBW)
may be used.
For single-supply applications, the +IN input can be biased
with a positive dc voltage to allow the output to reach true
zero when the photodiode is not exposed to any light, and
respond without the added delay that results from coming
out of the negative rail. (Refer to Figure 6.) This bias
voltage also appears across the photodiode, providing a
reverse bias for faster operation.
OPA727
V
OUT
10M
V+
R
F
C
F(1)
< 1pF
λ
NOTE: (1) C
is optional to prevent gain peaking.
It includes the stray capacitance of R
F
.
+V
Bias
Figure 6. Single-Supply Transimpedance
Amplifier
For additional information, refer to Application Bulletin
SBOA055,
Compensate Transimpedance Amplifiers
Intuitively
, available for download at www.ti.com.
OPTIMIZING THE TRANSIMPEDANCE
CIRCUIT
To achieve the best performance, components should be
selected according to the following guidelines:
1.
For lowest noise, select R
F
to create the total required
gain. Using a lower value for R
F
and adding gain after
the transimpedance amplifier generally produces
poorer noise performance. The noise produced by R
F
increases with the square-root of R
F
, whereas the
signal increases linearly. Therefore, signal-to-noise
ratio is improved when all the required gain is placed
in the transimpedance stage.
2.
Minimize
capacitance at the summing junction (inverting input).
This capacitance causes the voltage noise of the op
amp to be amplified (increasing amplification at high
frequency). Using a low-noise voltage source to
reverse-bias a photodiode can significantly reduce its
capacitance. Smaller photodiodes have lower
capacitance. Use optics to concentrate light on a small
photodiode.
photodiode
capacitance
and
stray
3.
Noise increases with increased bandwidth. Limit the
circuit bandwidth to only that required. Use a capacitor
across the R
F
to limit bandwidth, even if not required
for stability.
4.
Circuit board leakage can degrade the performance of
an otherwise well-designed amplifier. Clean the circuit
board carefully. A circuit board guard trace that
encircles the summing junction and is driven at the
same voltage can help control leakage.
For additional information, refer to the Application Bulletins
Noise Analysis of FET Transimpedance Amplifiers
(SBOA060), and
Noise Analysis for High-Speed Op Amps
(SBOA066), available for download at the TI web site.
(1)
(2)
相關(guān)PDF資料
PDF描述
OPA2734 CEC/I2C-bus translator, SOT360-1 (TSSOP20), Reel Dry Pack, SMD, 13&quot;
OPA2734AIDGSRG4 HDMI transmitter up to 150 MHz pixel rate with 3 x 8-bit video inputs and 4 x I2S-bus with S/PDIF, SOT315-1 (LQFP80), Tray Dry Pack, Bakeable, Multiple
OPA2734AIDGSTG4 Single Audio Amplifier
OPA2735 High-speed CAN transceiver with Standby mode, SOT96-1 (SO8), Tape reel SMD
OPA27 Ultra-Low-Noise Precision Operational Amplifier
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
OPA728AIDGKR 功能描述:運(yùn)算放大器 - 運(yùn)放 e-trim 20MHz High Precision CMOS RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
OPA728AIDGKRG4 功能描述:運(yùn)算放大器 - 運(yùn)放 e-trim 20MHz High Precision CMOS RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
OPA728AIDGKT 功能描述:運(yùn)算放大器 - 運(yùn)放 e-trim 20MHz High Precision CMOS RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
OPA728AIDGKTG4 功能描述:運(yùn)算放大器 - 運(yùn)放 e-trim 20MHz High Precision CMOS RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
OPA728AIDRBR 功能描述:運(yùn)算放大器 - 運(yùn)放 e-trim 20MHz High Precision CMOS RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*