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參數(shù)資料
| 型號： | OPA2365 |
| 英文描述： | 2.2V, 50MHz, Low-Noise, Single-Supply Rail-to-Rail OPERATIONAL AMPLIFIERS |
| 中文描述： | 2.2伏，50MHz的，低噪聲，單電源軌至軌運算放大器 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 301K |
| 代理商： | OPA2365 |
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SBOS365A JUNE 2006 REVISED JULY 2006
www.ti.com
10
ACHIEVING AN OUTPUT LEVEL OF
ZERO VOLTS (0V)
Certain single-supply applications require the op amp
output to swing from 0V to a positive full-scale voltage
and have high accuracy. An example is an op amp
employed to drive a single-supply ADC having an input
range from 0V to +5V. Rail-to-rail output amplifiers with
very light output loading may achieve an output level
within millivolts of 0V (or +V
S
at the high end), but not
0V. Furthermore, the deviation from 0V only becomes
greater as the load current required increases. This in-
creased deviation is a result of limitations of the CMOS
output stage.
When a pull-down resistor is connected from the ampli-
fier output to a negative voltage source, the OPA365
can achieve an output level of 0V, and even a few milli-
volts below 0V. Below this limit, nonlinearity and limiting
conditions become evident. Figure 7 illustrates a circuit
using this technique.
A pull-down current of approximately 500
μ
A is required
when OPA365 is connected as a unity-gain buffer.
A practical termination voltage (V
NEG
) is 5V, but
other convenient negative voltages also may be
used. The pull-down resistor R
L
is calculated from
R
L
= [(V
O
V
NEG
)/(500
μ
A)]. Using a minimum output
voltage (V
O
) of 0V, R
L
= [0V(5V)]/(500
μ
A)] = 10k
.
Keep in mind that lower termination voltages result in
smaller pull-down resistors that load the output during
positive output voltage excursions.
Note that this technique does not work with all op amps
and should only be applied to op amps such as the
OPA365 that have been specifically designed to oper-
ate in this manner. Also, operating the OPA365 output
at 0V changes the output stage operating conditions,
resulting in somewhat lower open-loop gain and band-
width. Keep these precautions in mind when driving a
capacitive load because these conditions can affect cir-
cuit transient response and stability.
ACTIVE FILTERING
The OPA365 is well-suited for active filter applications
requiring a wide bandwidth, fast slew rate, low-noise,
single-supply operational amplifier. Figure 8 shows a
500kHz, 2nd-order, low-pass filter utilizing the multiple
feedback (MFB) topology. The components have been
selected to provide a maximally-flat Butterworth
response. Beyond the cutoff frequency, roll-off is
40dB/dec. The Butterworth response is ideal for ap-
plications requiring predictable gain characteristics
such as the anti-aliasing filter used ahead of an ADC.
V
OUT
R
P
= 10k
500
μ
A
OPA365
V
IN
V+ = +5V
Op Amps
Negative
Supply
Grounded
V =
5V
(Additional
Negative Supply)
Figure 7. Swing-to-Ground
C
1
1nF
C
150pF
R
3
549
R
1
549
R
2
1.24k
V+
V
OUT
V
IN
V
OPA365
Figure 8. Second-Order Butterworth 500kHz
Low-Pass Filter
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| OPA2365AID | 功能描述:運算放大器 - 運放 50MHz Single Supply Rail-to-Rail 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 |
| OPA2365AIDG4 | 功能描述:運算放大器 - 運放 50MHz Single Supply Rail-to-Rail 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 |
| OPA2365AIDR | 功能描述:運算放大器 - 運放 2.2V 50MHz Lo-Noise Sgl-Spy 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 |
| OPA2365AIDRG4 | 功能描述:運算放大器 - 運放 2.2V 50MHz Lo-Noise Sgl-Spy 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 |
| OPA2365AQDRQ1 | 功能描述:運算放大器 - 運放 2.2V,50MHz,Lo-Noise Sgl-Sply RR 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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