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參數(shù)資料
| 型號(hào)： | OPA4342 |
| 英文描述： | Low Cost, Low Power, Rail-to-Rail OPERATIONAL AMPLIFIERS MicroAmplifier ⑩ Series |
| 中文描述： | 低成本，低功耗，軌至軌運(yùn)算放大器MicroAmplifier⑩系列 |
| 文件頁(yè)數(shù)： | 10/10頁(yè) |
| 文件大小： | 234K |
| 代理商： | OPA4342 |
10
OPA342, 2342, 4342
Overshoot vs Capacitive Load.” In unity-gain configura-
tions, capacitive load drive can be improved by inserting a
small (10
to 20
) resistor, R
S
, in series with the output, as
shown in Figure 5. This significantly reduces ringing while
maintaining dc performance for purely capacitive loads.
However, if there is a resistive load in parallel with the
capacitive load, a voltage divider is created, introducing a dc
error at the output and slightly reducing the output swing.
The error introduced is proportional to the ratio R
S
/R
L
, and
is generally negligible.
FIGURE 6. OPA342 in Noninverting Configuration Driving ADS7822.
FIGURE 7. Speech Bandpass Filtered Data Acquisition System.
DRIVING A/D CONVERTERS
The OPA342 series op amps are optimized for driving
medium-speed sampling ADCs. The OPA342 op amps buffer
the ADC’s input capacitance and resulting charge injection
while providing signal gain.
Figures 6 shows the OPA342 in a basic noninverting con-
figuration driving the ADS7822. The ADS7822 is a 12-bit,
micro-power sampling converter in the MSOP-8 package.
When used with the low-power, miniature packages of the
OPA342, the combination is ideal for space-limited, low-
power applications. In this configuration, an RC network at
the ADC’s input can be used to filter charge injection.
Figure 7 shows the OPA2342 driving an ADS7822 in a
speech bandpass 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 with less than 500
μ
A quiescent current.
FIGURE 5. Series Resistor in Unity-Gain Configuration
Improves Capacitive Load Drive.
10
to
20
OPA342
V+
V
IN
V
OUT
R
S
R
L
C
L
C
3
33pF
V+
GND
3
1
8
4
5
6
7
–IN
+IN
2
C
2
DCLOCK
D
OUT
Serial
Interface
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
.
ADS7822
12-Bit A/D
1/2
OPA2342
1/2
OPA2342
ADS7822
12-Bit A/D
DCLOCK
D
OUT
CS/SHDN
OPA342
+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: A/D Input = 0 to V
REF
V
= 0V to 5V for
0V to 5V output.
RC network filters high frequency noise.
500
3300pF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA342 | Low Cost, Low Power, Rail-to-Rail OPERATIONAL AMPLIFIERS MicroAmplifier ⑩ Series |
| OPA4342EA | Low Cost, Low Power, Rail-to-Rail OPERATIONAL AMPLIFIERS MicroAmplifier ⑩ Series |
| OPA4342PA | Low Cost, Low Power, Rail-to-Rail OPERATIONAL AMPLIFIERS MicroAmplifier ⑩ Series |
| OPA342NA | Low Cost, Low Power, Rail-to-Rail OPERATIONAL AMPLIFIERS MicroAmplifier ⑩ Series |
| OPA342UA | Low Cost, Low Power, Rail-to-Rail OPERATIONAL AMPLIFIERS MicroAmplifier ⑩ Series |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA4342EA | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| OPA4342EA/250 | 功能描述:運(yùn)算放大器 - 運(yùn)放 Low Cost Lo-Power Rail-to-Rail 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 |
| OPA4342EA/250G4 | 功能描述:運(yùn)算放大器 - 運(yùn)放 Low Cost Lo-Power Rail-to-Rail 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 |
| OPA4342EA/2K5 | 功能描述:IC OPAMP GP R-R 1MHZ 14TSSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:MicroAmplifier™ 產(chǎn)品變化通告:Discontinuation 18/May/2012 標(biāo)準(zhǔn)包裝:2,000 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.42 V/µs 增益帶寬積:1.5MHz -3db帶寬:- 電流 - 輸入偏壓:15nA 電壓 - 輸入偏移:1000µV 電流 - 電源:116µA 電流 - 輸出 / 通道:100mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5 V，±0.9 V ~ 2.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 產(chǎn)品目錄頁(yè)面:851 (CN2011-ZH PDF) 其它名稱:296-20930-2 |
| OPA4342EA250 | 制造商:BB 制造商全稱:BB 功能描述:Low-Cost, Low-Power, Rail-to-Rail OPERATIONAL AMPLIFIERS MicroAmplifier ⑩ Series |
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