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參數(shù)資料
| 型號： | OPA353 |
| 英文描述： | High-Speed, Single-Supply, Rail-to-Rail OPERATIONAL AMPLIFIERS MicroAmplifier ⑩ Series |
| 中文描述： | 高速，單電源，軌至軌運(yùn)算放大器MicroAmplifier⑩系列 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大小： | 192K |
| 代理商： | OPA353 |
10
OPA353, 2353, 4353
Figure 5 shows the OPA353 driving an ADS7861. The
ADS7861 is a dual, 12-bit, 500kHz sampling converter in
the small SSOP-24 package. When used with the miniature
package options of the OPA353 series, the combination is
ideal for space-limited and low power applications. For
further information consult the ADS7861 data sheet.
OUTPUT IMPEDANCE
The low frequency open-loop output impedance of the
OPA353’s common-source output stage is approximately
1k
. When the op amp is connected with feedback, this
value is reduced significantly by the loop gain of the op
amp. For example, with 122dB of open-loop gain, the
output impedance is reduced in unity-gain to less than
0.001
. For each decade rise in the closed-loop gain, the
loop gain is reduced by the same amount which results in
a ten-fold increase in output impedance (see the typical
performance curve, “Output Impedance vs Frequency”).
At higher frequencies, the output impedance will rise as
the open-loop gain of the op amp drops. However, at these
frequencies the output also becomes capacitive due to
parasitic capacitance. This prevents the output impedance
from becoming too high, which can cause stability prob-
lems when driving capacitive loads. As mentioned previ-
ously, the OPA353 has excellent capacitive load drive
capability for an op amp with its bandwidth.
VIDEO LINE DRIVER
Figure 6 shows a circuit for a single supply, G = 2 com-
posite video line driver. The synchronized outputs of a
composite video line driver extend below ground. As
shown, the input to the op amp should be ac-coupled and
shifted positively to provide adequate signal swing to
account for these negative signals in a single-supply con-
figuration.
The input is terminated with a 75
resistor and ac-coupled
with a 47
μ
F capacitor to a voltage divider that provides the
dc bias point to the input. In Figure 6, this point is
approximately (V–) + 1.7V. Setting the optimal bias point
requires some understanding of the nature of composite
video signals. For best performance, one should be careful
to avoid the distortion caused by the transition region of
the OPA353’s complementary input stage. Refer to the
discussion of rail-to-rail input.
FIGURE 5. OPA4353 Driving Sampling A/D Converter.
1/4
OPA4353
V
IN
B1
2
3
4
2k
2k
C
B1
CH B1+
CH B1–
CH B0+
CH B0–
CH A1+
CH A1–
CH A0+
CH A0–
REF
IN
REF
OUT
Serial Data A
Serial Data B
BUSY
CLOCK
CS
RD
CONVST
A0
M0
M1
2
3
4
5
6
7
8
9
10
11
23
22
21
20
19
18
17
16
15
14
1/4
OPA4353
V
IN
B0
+5V
6
5
2k
2k
C
B0
1/4
OPA4353
V
IN
A1
9
10
8
7
2k
2k
C
A1
1/4
OPA4353
V
IN
A0
14
11
1
12
2k
2k
C
A0
0.1
μ
F
0.1
μ
F
+V
A
+V
D
24
13
Serial
Interface
DGND
AGND
ADS7861
V
= 0V to 2.45V for 0V to 4.9V output.
Choose C
B1
, C
B0
, C
A1
, C
A0
to filter high frequency noise.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA353NA | 制造商:Texas Instruments 功能描述:OP AMP HIGH SPEED RRI/O SOT-23-5 |
| OPA353NA/250 | 功能描述:高速運(yùn)算放大器 Hi-Spd Single-Sply Rail-to-Rail RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA353NA/250 | 制造商:Texas Instruments 功能描述:IC SM OP-AMP HI-SPEED RRI/O |
| OPA353NA/250G4 | 功能描述:高速運(yùn)算放大器 Hi-Spd Sgl-Supply Rail-to-Rail Op Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA353NA/3K | 功能描述:高速運(yùn)算放大器 Hi-Spd Single-Sply Rail-to-Rail RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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