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參數資料
| 型號： | OPA350UA |
| 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，軌至軌運算放大器MicroAmplifier⑩系列 |
| 文件頁數： | 10/11頁 |
| 文件大?。?/td> | 205K |
| 代理商： | OPA350UA |
10
OPA350, 2350, 4350
FIGURE 5. OPA4350 Driving Sampling A/D Converter.
Figure 5 shows the OPA350 driving an ADS7861. The
ADS7861 is a dual, 500kHz 12-bit sampling converter in
the tiny SSOP-24 package. When used with the miniature
package options of the OPA350 series, the combination is
ideal for space-limited applications. For further informa-
tion, consult the ADS7861 data sheet.
OUTPUT IMPEDANCE
The low frequency open-loop output impedance of the
OPA350’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 effective output impedance (see the
typical performance curve, “Output Impedance vs Fre-
quency”).
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 OPA350 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 OPA350’s complementary input stage. Refer to the
discussion of rail-to-rail input.
1/4
OPA4350
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
OPA4350
V
IN
B0
+5V
6
5
2k
2k
C
B0
1/4
OPA4350
V
IN
A1
9
10
12
13
8
7
1
2k
2k
C
A1
1/4
OPA4350
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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PDF描述 |
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| OPA2350UA | High-Speed, Single-Supply, Rail-to-Rail OPERATIONAL AMPLIFIERS MicroAmplifier ⑩ Series |
| OPA4350UA | High-Speed, Single-Supply, Rail-to-Rail OPERATIONAL AMPLIFIERS MicroAmplifier ⑩ Series |
| OPA2350 | High-Speed, Single-Supply, Rail-to-Rail OPERATIONAL AMPLIFIERS MicroAmplifier ⑩ Series |
| OPA2350EA | High-Speed, Single-Supply, Rail-to-Rail OPERATIONAL AMPLIFIERS MicroAmplifier ⑩ Series |
| OPA4350 | SOCKET, STRAIGHT, CABLE 5/50; Connector type:SHV, Coaxial; Impedance:50R; Cable type:5/50 S; Material, contact:Beryllium Copper; Plating, contact:Nickel; Body style:Straight Socket; Termination method:Clamp; Mounting type:Cable; RoHS Compliant: Yes |
相關代理商/技術參數 |
參數描述 |
|---|---|
| OPA350UA | 制造商:Texas Instruments 功能描述:OP AMP HIGH SPEED RRI/O SOIC 350 |
| OPA350UA/2K5 | 功能描述:高速運算放大器 Hi-Spd Single-Sply Rail-to-Rail RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA350UA/2K5G4 | 功能描述:高速運算放大器 Hi-Spd Single-Sply Rail-to-Rail RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA350UA2K5 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High-Speed, Single-Supply, Rail-to-Rail OPERATIONAL AMPLIFIERS |
| OPA350UA-2K5 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High-Speed, Single-Supply, Rail-to-Rail OPERATIONAL AMPLIFIERS MicroAmplifierSeries |
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