參數(shù)資料
型號： OPA4374AIPWT
英文描述： 6.5MHz, 585UA, Rail-to-Rail I/O CMOS Operational Amplifier
中文描述： 6.5MHz，585UA，軌對軌輸入/輸出CMOS運算放大器
文件頁數(shù)： 11/21頁
文件大?。?/td> 549K
代理商： OPA4374AIPWT
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SBOS279D SEPTEMBER 2003 REVISED DECEMBER 2004
www.ti.com
11
DRIVING ADCs
The OPA373 and OPA374 series op amps are optimized
for driving medium-speed sampling ADCs. The OPA373
and OPA374 op amps buffer the ADC input capacitance
and resulting charge injection, while providing signal gain.
The OPA373 is shown driving the ADS7816 in a basic
noninverting configuration, as shown in Figure 7. The
ADS7816 is a 12-bit,
Micro
Power sampling converter in
the MSOP-8 package. When used with the low-power,
miniature packages of the OPA373, the combination is
ideal for space-limited, low-power applications. In this
configuration, an RC network at the ADC input can be used
to provide anti-aliasing filtering.
Figure 8 shows the OPA373 driving the ADS7816 in a
speech band-pass filtered data acquisition system. This
small, low-cost solution provides the necessary
amplification and signal conditioning to interface directly
with an electret microphone. This circuit will operate with
V
S
= 2.7V to 5V.
The OPA373 is shown in the inverting configuration
described in Figure 9. In this configuration, filtering may be
accomplished with the capacitor across the feedback
resistor.
ENABLE/SHUTDOWN
OPA373 and OPA374 series op amps typically require
585
μ
A quiescent current. The enable/shutdown feature of
the OPA373 allows the op amp to be shut off in order to
reduce this current to less than 1
μ
A.
ADS7816
12Bit ADC
DCLOCK
D
OUT
CS/SHDN
OPA373
+5V
V
IN
V+
2
+In
3
In
V
REF
8
4
GND
Serial
Interface
1
0.1
μ
F
0.1
μ
F
7
6
5
NOTE: ADC Input = 0 to V
REF
V
= 0V to 5V for
0V to 5V output.
RC network filters high frequency noise.
500
3300pF
f
SAMPLE
= 100kHz
Figure 7. The OPA373 in Noninverting Configuration Driving the ADS7816
C
33pF
V+
3
1
8
4
GND
5
6
7
IN
+IN
2
DCLOCK
D
OUT
Serial
Interface
C
1000pF
R
1
1.5k
R
4
20k
R
5
20k
R
6
100k
R
8
150k
R
9
510k
R
7
51k
V
REF
V+ = +2.7V to +5V
CS/SHDN
C
1
1000pF
Electret
Microphone
(1)
G = 100
Passband 300Hz to 3kHz
R
3
1M
R
2
1M
NOTE: (1) Electret microphone
powered by R
1
.
ADS7816
12Bit ADC
1/2
OPA2373
1/2
OPA2373
Figure 8. The OPA2373 as a Speech Bypass Filtered Data Acquisition System
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相關代理商/技術參數(shù)
參數(shù)描述
OPA4374AIPWTG4 功能描述:運算放大器 - 運放 Quad 6.5MHz 585uA R-to-R I/O 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
OPA4376 制造商:BB 制造商全稱:BB 功能描述:Precision, Low Noise, Low Quiescent Current, Operational Amplifier
OPA4376AIPW 功能描述:運算放大器 - 運放 Precision Lo Noise Lo Quiescent Current 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
OPA4376AIPWG4 功能描述:運算放大器 - 運放 Prec Lo Noise Low Quies Crnt Op Amp 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
OPA4376AIPWR 功能描述:運算放大器 - 運放 Precision Lo Noise Lo Quiescent Current 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
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