AD829SQ(RevI) 데이터 시트보기 (PDF) - Analog Devices
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AD829SQ Datasheet PDF : 20 Pages
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Data Sheet
Figure 44 and Figure 45 show the closed-loop frequency
response of the AD829 for different closed-loop gains and
different supply voltages.
15
GAIN = –4
12
CCOMP = 2pF
9
GAIN = –2
6
CCOMP = 3pF
3
GAIN = –1
0
CCOMP = 4pF
–3
–6
–9 VS = ±15V
RL = 1kΩ
–12 RF = 1kΩ
VIN = –30dBm
–15
1
10
100
FREQUENCY (MHz)
Figure 44. Closed-Loop Frequency Response for the Inverting Amplifier Using
Current Feedback Compensation
–17
–20
–23
±5V
–26
±15V
–29
–32
–35
–38
VIN = –20dBm
–41 RL = 1kΩ
RF = 1kΩ
–44 GAIN = –1
CCOMP = 4pF
–47
1
10
100
FREQUENCY (MHz)
Figure 45. Closed-Loop Frequency Response vs. Supply for the Inverting
Amplifier Using Current Feedback Compensation
When a noninverting amplifier configuration using a current
feedback compensation is needed, the circuit shown in Figure 46 is
recommended. This circuit provides a slew rate twice that of the
shunt compensated noninverting amplifier of Figure 47 at the
expense of gain flatness. Nonetheless, this circuit delivers 95 MHz
bandwidth with 1 dB flatness into a back-terminated cable,
with a differential gain error of only 0.01% and a differential
phase error of only 0.015 at 4.43 MHz.
AD829
+15V
0.1µF
50Ω
COAX
CABLE
7
VIN
3+
50Ω
AD829
50Ω
COAX
50Ω CABLE
6
VOUT
2–
5
50kΩ
4
–15V
0.1µF
3pF
CCOMP
2kΩ
2kΩ
Figure 46. Noninverting Amplifier Connection Using Current Feedback
Compensation
0.1µF
+15V
VIN
75Ω
7
3+
AD829 6
2–
4
5
50Ω
COAX
75Ω CABLE
VOUT
75Ω
30pF
CCOMP –15V
0.1µF
300Ω
OPTIONAL
2pF TO 7pF
FLATNESS
TRIM
300Ω
Figure 47. Video Line Driver with a Flatness over Frequency Adjustment
LOW ERROR VIDEO LINE DRIVER
The buffer circuit shown in Figure 47 drives a back-terminated
75 Ω video line to standard video levels (1 V p-p), with 0.1 dB
gain flatness to 30 MHz and with only 0.04° and 0.02% differential
phase and gain at the 4.43 MHz PAL color subcarrier frequency.
This level of performance, which meets the requirements for
high definition video displays and test equipment, is achieved
using only 5 mA quiescent current.
Rev. I | Page 15 of 20
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