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參數(shù)資料
| 型號： | OPA2374AIDCNT |
| 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(yùn)算放大器 |
| 文件頁數(shù)： | 10/21頁 |
| 文件大小： | 549K |
| 代理商： | OPA2374AIDCNT |
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SBOS279D SEPTEMBER 2003 REVISED DECEMBER 2004
www.ti.com
10
R
OPA373
V+
V
IN
V
OUT
10mA max
I
OVERLOAD
Figure 3. Input Current Protection for Voltages
Exceeding the Supply Voltage
RAIL-TO-RAIL OUTPUT
A class AB output stage with common-source transistors
is used to achieve rail-to-rail output. For light resistive
loads ( > 100k
), the output voltage can typically swing to
within 18mV from the supply rails. With moderate resistive
loads (5k
to 50k
), the output can typically swing to
within 100mV from the supply rails and maintain high
open-loop gain. See the Typical Characteristics curve,
Output Voltage Swing vs Output Current
, for more
information.
CAPACITIVE LOAD AND STABILITY
OPA373 series op amps can drive a wide range of
capacitive loads. However, under certain conditions, all op
amps may become unstable. Op amp configuration, gain,
and load value are just a few of the factors to consider
when determining stability. An op amp in unity-gain
configuration is the most susceptible to the effects of
capacitive load. The capacitive load reacts with the op amp
output resistance, along with any additional load
resistance, to create a pole in the small-signal response
that degrades the phase margin. The OPA373 series op
amps perform well in unity-gain configuration, with a pure
capacitive load up to approximately 250pF. Increased
gains allow the amplifier to drive more capacitance. See
the Typical Characteristics curve,
Small-Signal Overshoot
vs Capacitive Load
, for further details.
One method of improving capacitive load drive in the
unity-gain configuration is to insert a small (10
to 20
)
resistor, R
S
, in series with the output, as shown in Figure 4.
This significantly reduces ringing while maintaining DC
performance for purely capacitive loads. When there is a
resistive load in parallel with the capacitive load, R
S
must
be placed within the feedback loop as shown to allow the
feedback loop to compensate for the voltage divider
created by R
S
and R
L
.
In unity-gain inverter configuration, phase margin can be
reduced by the reaction between the capacitance at the op
amp input and the gain setting resistors, thus degrading
capacitive load drive. Best performance is achieved by
using small valued resistors. However, when large valued
resistors cannot be avoided, a small (4pF to 6pF)
capacitor, C
FB
, can be inserted in the feedback, as shown
in Figure 5. This significantly reduces overshoot by
compensating the effect of capacitance, C
IN
, which
includes the amplifier input capacitance and PC board
parasitic capacitance.
R
10
to 20
OPA373
C
L
R
L
V
IN
V
OUT
V+
Figure 4. Series Resistor in Unity-Gain
Configuration Improves Capacitive Load Drive
R
I
OPA373
V
IN
V
OUT
R
F
C
FB
C
IN
C
L
V+
Figure 5. Improving Capacitive Load Drive
For example, when driving a 100pF load in unity-gain
inverter configuration, adding a 6pF capacitor in parallel
with the 10k
feedback resistor decreases overshoot from
57% to 12%, as shown in Figure 6.
Load Capacitance (pF)
10
100
1k
10k
60
50
40
30
20
10
0
O
G =
1V/V
R
FB
= 10k
C
FB
= 6pF
Figure 6. Improving Capacitive Load Drive
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA2374AIDCNT | 制造商:Texas Instruments 功能描述:IC OP AMP DUAL CMOS SOT23-8 制造商:Texas Instruments 功能描述:IC, OP AMP, DUAL CMOS, SOT23-8 制造商:Texas Instruments 功能描述:IC, OP AMP, DUAL CMOS, SOT23-8; Op Amp Type:Low Power; No. of Amplifiers:2; Slew Rate:5V/s; Supply Voltage Range:2.3V to 5.5V; Amplifier Case Style:SOT-23; No. of Pins:8; Bandwidth:6.5MHz; Operating Temperature Min:-40C; Operating ;RoHS Compliant: Yes |
| OPA2374AIDCNTG4 | 功能描述:運(yùn)算放大器 - 運(yùn)放 Dual 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(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 |
| OPA2374AIDG4 | 功能描述:運(yùn)算放大器 - 運(yùn)放 Dual 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(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 |
| OPA2374AIDR | 功能描述:運(yùn)算放大器 - 運(yùn)放 Dual 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(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 |
| OPA2374AIDRG4 | 功能描述:運(yùn)算放大器 - 運(yùn)放 Dual 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(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 |
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