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AD828 Fiches technique(PDF) 11 Page - Analog Devices

No de pièce AD828
Description  Dual, Low Power Video Op Amp
Download  12 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD828 Fiches technique(HTML) 11 Page - Analog Devices

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AD828
REV. B
–11–
3
2
1
1/2
AD828
RZ
AIN
1/2
AD828
510
2
3
BIN
RZ
100FT
RG59A/U
RZ = 75
1
1/2
AD828
BOUT
5
6
7
6
5
1/2
AD828
AOUT
7
510
510
536
510
510
536
510
Full-Duplex Transmission
Superior load handling capability (50 mA min/amp), high band-
width, wide supply voltage range and excellent crosstalk
rejection makes the AD828 an ideal choice even for the most
demanding high speed transmission applications.
The schematic below shows a pair of AD828s configured to
drive 100 feet of coaxial cable in a full-duplex fashion.
Two different NTSC video signals are simultaneously applied at
AIN and BIN and are recovered at AOUT and BOUT, respectively.
This situation is illustrated in Figures 43 and 44. These pictures
clearly show that each input signal appears undisturbed at its
output, while the unwanted signal is eliminated at either receiver.
The transmitters operate as followers, while the receivers’ gain is
chosen to take full advantage of the AD828’s unparalleled CMRR.
(In practice this gain is adjusted slightly from its theoretical
value to compensate for cable nonidealities and losses.) RZ is
chosen to match the characteristic impedance of the cable
employed.
Finally, although a coaxial cable was used, the same topology
applies unmodified to a variety of cables (such, as twisted pairs
often used in telephony).
10
90
0%
100
500mV
500mV
10µs
AIN
BOUT
Figure 43. A Transmission/B Reception
Figure 42. Bidirectional Transmission CKT
10
90
0%
100
500mV
500mV
10µs
BIN
AOUT
Figure 44. B Transmission/A Reception
A High Performance Video Line Driver
The buffer circuit shown in Figure 45 will drive a back-
terminated 75
Ω video line to standard video levels (1 V p-p)
with 0.1 dB gain flatness to 40 MHz with only 0.05
° and 0.01%
differential phase and gain at the 3.58 MHz NTSC subcarrier
frequency. This level of performance, which meets the require-
ments for high-definition video displays and test equipment, is
achieved using only 7 mA quiescent current/amplifier.
3
2
1
1/2
AD828
8
0.1 F
4
+15V
–15V
RBT
75
RT
75
VIN
1k
1.0 F
0.1 F
1.0 F
1k
75
RT
75
Figure 45. Video Line Driver


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