ADA4432-1/ADA4433-1

Data Sheet

Rev. E | Page 22 of 25

FULLY DC-COUPLED TRANSMISSION LINE

The ADA4432-1and ADA4433-1 are designed to be used with

high common-mode rejection, high input impedance receivers

such as the ADA4830-1, ADA4830-2, or other generic receivers.

The very low output impedance of the ADA4432-1 and the

ADA4433-1 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 is anticipated.

Figure 54 and Figure 55 show an example configuration of a

completely dc-coupled transmission using the ADA4432-1 and

the ADA4433-1 along with a high input impedance differential

receiver.

Figure 54. ADA4432-1 Video Filter and the ADA4830-1 Difference Amplifier in a DC-Coupled Configuration

Figure 55. ADA4433-1 Video Filter and ADA4830-1 Difference Amplifier in a DC-Coupled Configuration

RT

FROM

IMAGER

OR VIDEO

ENCODER

INN

VOUT

TO VIDEO

DECODER

GND

INP

ADA4830-1

75

Ω

−

+

+

STB

ENA

+VS

4.7µF

0.1µF

+VS

ENABLE

(INPUT)

STB FLAG

(OUTPUT)

2.2µF

0.1µF

4.99k

Ω

+VS

(5.0V)

+VS

(3.3V)

VREF

−

+

75

Ω

TWISTED

PAIR

STB

ENABLE

(INPUT)

ADA4432-1

LFCSP PACKAGE

75Ω

IN

GND

OUT

2.2µF

ENA

+VS

0.1µF

STB

STB FLAG

(OUTPUT)

INN

VOUT

TO

VIDEO

DECODER

GND

INP

ADA4830-1

ADA4433-1

75

Ω

−

+

+

STB

ENA

+VS

4.7µF

0.1µF

+VS

ENABLE

(INPUT)

STB FLAG

(OUTPUT)

2.2µF

0.1µF

4.99k

Ω

+VS

(5.0V)

VREF

−

+

75

Ω

TWISTED

PAIR

RT

+VS

GND

LPF

LPF

+

STB

ENA

+VS

ENABLE

(INPUT)

STB FLAG

(OUTPUT)

2.2µF

0.1µF

0.1µF

+VS

(3.3V)

+IN

–IN

–OUT

+OUT

37.5

Ω

1.33k

Ω

7.5k

Ω

37.5

Ω

FROM

IMAGER

OR VIDEO

ENCODER