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| 型號： | OPA2376AIDGKT |
| 英文描述： | Precision, Low Noise, Low Quiescent Current, Operational Amplifier |
| 中文描述： | 精密，低噪聲，低靜態(tài)電流，運算放大器 |
| 文件頁數(shù)： | 11/23頁 |
| 文件大小： | 759K |
| 代理商： | OPA2376AIDGKT |
www.ti.com
CAPACITIVE LOAD AND STABILITY
The OPA376 series of amplifiers may be used in
applications
where
driving
required. As with all op amps, there may be specific
instances where the OPAx376 can become unstable,
leading to oscillation. The particular op amp circuit
configuration, layout, gain and output loading are
some of the factors to consider when establishing
whether an amplifier will be stable in operation. An op
amp in the unity-gain (+1V/V) buffer configuration and
driving a capacitive load exhibits a greater tendency
to be unstable than an amplifier operated at a higher
noise gain. The capacitive load, in conjunction with
the op amp output resistance, creates a pole within
the feedback loop that degrades the phase margin.
The degradation of the phase margin increases as
the capacitive loading increases.
ACTIVE FILTERING
The
OPA376
applications requiring a wide bandwidth, fast slew
rate, low-noise, single-supply operational amplifier.
Figure 26
shows a 50kHz, 2nd-order, low-pass filter.
The components have been selected to provide a
maximally-flat
Butterworth
cutoff
frequency,
roll-off
Butterworth
response
is
requiring predictable gain characteristics such as the
anti-aliasing filter used ahead of an analog-to-digital
converter (ADC).
C
1
1nF
C
150pF
2
R
3
5.49k
W
R
1
5.49k
W
R
2
12.4k
W
V+
V
OUT
V
IN
OPA376
(V+)/2
DRIVING AN ANALOG-TO-DIGITAL
CONVERTER
The low noise and wide gain bandwidth of the
OPA376 family make it an ideal driver for ADCs.
Figure
27
illustrates
the
ADS8327
, 16-bit, 250kSPS converter. The amplifier is
connected as a unity-gain, noninverting buffer.
10
20
W
to
W
V+
V
IN
V
OUT
R
S
R
L
C
L
OPA376
OPA376
OPA2376
OPA4376
SBOS406B–JUNE 2007–REVISED SEPTEMBER 2007
series
is
well-suited
for
filter
a
capacitive
load
is
response.
is
ideal
Beyond
the
The
–40dB/dec.
for
applications
The OPAx376 in a unity-gain configuration can
directly drive up to 250pF pure capacitive load.
Increasing the gain enhances the ability of the
amplifier to drive greater capacitive loads (see the
typical characteristic plot,
Small-Signal Overshoot vs
Capacitive
Load
.
In
unity-gain
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
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 gain
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 at low output
current levels.
configurations,
25
.
This
resistor
Figure 26. Second-Order Butterworth 50kHz
Low-Pass Filter
OPA376
driving
an
Figure 25. Improving Capacitive Load Drive
Copyright 2007, Texas Instruments Incorporated
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Product Folder Link(s):
OPA376 OPA2376 OPA4376
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| OPA2376AIDGKTG4 | 功能描述:運算放大器 - 運放 Prec Lo Noise Lo Quies Current 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 |
| OPA2376AIDR | 功能描述:運算放大器 - 運放 Precision Lo Noise Low Quies 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 |
| OPA2376AIDRG4 | 功能描述:運算放大器 - 運放 Prec Lo Noise Lo Quies Current 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 |
| OPA2376AIYZDR | 功能描述:運算放大器 - 運放 Prec/Low noise 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 |
| OPA2376AIYZDT | 功能描述:運算放大器 - 運放 Prec/Low noise 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 |
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