AD828ARZ Analog Devices Inc, AD828ARZ Datasheet - Page 11

• Manufacturer Part Number: AD828ARZ
• Description: IC VIDEO OPAMP DUAL LP 8-SOIC
• Manufacturer: Analog Devices Inc

Specifications of AD828ARZ

• Slew Rate: 450 V/µs
• Applications: Voltage Feedback
• Number Of Circuits: 2
• -3db Bandwidth: 130MHz
• Current - Supply: 14mA
• Current - Output / Channel: 50mA
• Voltage - Supply, Single/dual (±): 5 V ~ 36 V, ±2.5 V ~ 18 V
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Gain Bandwidth: 130MHz
• Supply Voltage Range: ± 2.5V To ± 18V
• No. Of Amplifiers: 2
• Output Current: 50mA
• Amplifier Output: Single Ended
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Full-Duplex Transmission
Superior load handling capability (50 mA min/amp), high
bandwidth, wide supply voltage range, and excellent crosstalk
rejection makes the AD828 an ideal choice for even 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
A
This situation is illustrated in Figures 7 and 8. These pictures
A High Performance Video Line Driver
The buffer circuit shown in Figure 9 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 requirements for
high definition video displays and test equipment, is achieved
using only 7 mA quiescent current/amplifier.
REV. C
IN
and B
B
A
OUT
IN
IN
Figure 7. A Transmission/B Reception
and are recovered at A
100
90
10
0%
B
A
IN
OUT
500mV
500mV
510
3
2
7
536
OUT
AD828
1/2
AD828
and B
510
1/2
Figure 6. Bidirectional Transmission CKT
1
10µs
OUT
6
5
, respectively.
510
R
Z
100FT
RG59A/U
R
–11–
Z
= 75
clearly show that each input signal appears undisturbed at its out-
put, 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.
R
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).
V
IN
Z
is chosen to match the characteristic impedance of the
75
A
R
OUT
B
1k
510
T
IN
R
Z
Figure 8. B Transmission/A Reception
100
90
10
0%
3
2
Figure 9. Video Line Driver
6
5
1k
1
510
AD828
500mV
AD828
500mV
+15V
–15V
1/2
1/2
4
8
AD828
1/2
536
7
1
0.1 F
0.1 F
3
2
510
1.0 F
1.0 F
A
B
OUT
IN
10µs
R
75
BT
AD828
75
R
75
T