ADA4830-1/ADA4830-2

Data Sheet

Rev. C | Page 20 of 22

FULLY DC-COUPLED TRANSMISSION LINE

The wide input common-mode range and high input impedance of

the ADA4830-1 and ADA4830-2 allow them to be used in fully

dc-coupled transmission line applications in which there may be a

significant discrepancy between voltage levels at the ground pins of

the driver and receiver. As long as the voltage difference between

reference levels at the transmitter and receiver is within the

common-mode range of the receiver, very little current flow

results, and no image degradation should be anticipated.

Figure 42 shows an example configuration of a completely dc-

coupled transmission using a low impedance differential driver.

INN

VOUT

TO VIDEO

DECODER

GND

INP

ADA4830-1

75

Ω

−

+

GND

LPF

LPF

+

+

STB

ENA

+VS

4.7µF

0.1µF

+VS

ENABLE

(INPUT)

STB FLAG

(OUTPUT)

2.2µF

0.1µF

5k

Ω

(2.9V TO 5.5V)

STB

ENA

+VS

ENABLE

(INPUT)

STB FLAG

(OUTPUT)

2.2µF

0.1µF

(2.7V TO 3.6V)

VREF

+IN

–IN

–OUT

+OUT

−

+

75

Ω

TWISTED

PAIR

37.5

Ω

37.5

Ω

FROM

IMAGER

OR VIDEO

ENCODER

×1

Figure 42. Differential Video Filter Driver and ADA4830-1 Difference Amplifier