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參數(shù)資料
| 型號： | OPA357 |
| 元件分類： | 視頻放大器 |
| 英文描述： | 3V Video Amplifier with 6dB Gain and Filter in SC70 |
| 中文描述： | 3V的視頻放大器采用SC70的6dB增益和濾波器 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 329K |
| 代理商： | OPA357 |
"#$
SB0S294C DECEMBER 2003 REVISED JULY 2004
www.ti.com
10
SAG CORRECTION
Sag correction provides excellent video performance with
two small output coupling capacitors. It eliminates the
traditional, large 220
μ
F output capacitor. The traditional
220
μ
F circuit (Figure 9a) creates a single low frequency
pole (3dB frequency) at 5Hz. If this capacitor is made
much smaller, excessive phase shift in the critical 50 to
100Hz range produces
field tilt
which can interfere with
proper recovery of synchronization signals in the television
receiver.
The OPA360 sag correction circuit (Figure 9b, see also
Figure 14) creates an amplitude response peak in the
20Hz region. This small amount of peaking (a few tenths
of a dB) provides compensation of the phase response in
the critical 50Hz to 100Hz range, greatly reducing field tilt.
Note that two significantly smaller and lower cost
capacitors are required.
220
μ
F75
75
a)
Traditional Video Circuit
47
μ
F
75
22
μ
F
75
b)
OPA360 with Sag Connection
Figure 9. Traditional Video Circuit vs OPA360
with Sag Correction
To achieve good performance, a 22
μ
F sag correction and
47
μ
F coupling capacitor can be used. Figure 10 and
Figure 11 show comparisons for a standard video circuit
with a 220
μ
F coupling capacitor and the OPA360 with sag
correction.
Figure 10 shows that the 22
μ
F/47
μ
F combination leads to
only a slightly greater tilt in the 50Hz, 1/2 black 1/2 white
video signal. No degradation in video quality is observed.
Figure 10. Standard Video Circuit with 220 F
Capacitor (top trace) vs OPA360 with 22 F and
47 F Capacitors
A field tilt equivalent to that achieved using the standard
220
μ
F coupling capacitor can be achieved with a
22
μ
F/67
μ
F combination see Figure 11. These capacitor
values are optimized—sag correction capacitors larger
than 22
μ
F do not provide significant improvement. Smaller
sag correction capacitors will lead to higher tilt.
Figure 11. 220 F Standard Video Circuit (top
trace) vs OPA360 with 22 F/67 F
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參數(shù)描述 |
|---|---|
| OPA357AIDBVR | 功能描述:高速運算放大器 250MHz R-to-R I/O Single CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓: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 |
| OPA357AIDBVRG4 | 功能描述:高速運算放大器 250MHz R-to-R I/O Single CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓: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 |
| OPA357AIDBVT | 功能描述:高速運算放大器 250MHz R-to-R I/O Single CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓: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 |
| OPA357AIDBVTG4 | 功能描述:高速運算放大器 250MHz R-to-R I/O Single CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓: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 |
| OPA357AIDDA | 功能描述:高速運算放大器 250MHz R-to-R I/O Single CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓: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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