Differential Video Interface Chipset

________________________________________________________________ Maxim Integrated Products

1

19-3873; Rev 2; 7/07

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

General Description

The MAX9546/MAX9547 differential interface chipset

converts single-ended voltages to differential voltages for

transport and then converts back to single-ended volt-

ages. These devices eliminate costly, bulky, single-

ended coaxial cables with inexpensive, readily available,

differential shielded (ScTP) or unshielded (UTP) twisted

pairs. The fault detection of the MAX9546 and loss-of-sig-

nal detection of the MAX9547 allow proactive and

speedy diagnosis, such as identifying failures in the man-

ufacturing stage and troubleshooting equipment at repair

facilities. The MAX9546/MAX9547 are low-cost, conve-

nient solutions for transporting CVBS/FBAS analog video

signals (PAL or NTSC) through hostile environments.

The MAX9546 driver converts the single-ended input into

a differential output with a 6dB fixed gain to drive a back-

terminated, DC-coupled differential video output to unity

gain. This DC connection allows the detection of a short-

circuit condition at the differential outputs. The FAULT

output indicates a short-circuit condition including a short

The MAX9547 receiver converts the differential signal

from the MAX9546 into a single-ended signal. Like the

MAX9546 output, the MAX9547 input survives a short to

a high battery condition or ground. The MAX9547 receiv-

er loss-of-signal output (LOS) operates by detecting the

H-Sync and thus can support both monochrome and

color video signals. The MAX9547 gain is set with an

external impedance between ZT+ and ZT-.

The MAX9546/MAX9547 operate from a 7.5V to 10V

single supply. Both devices include ±15kV ESD Human

Body Model (HBM) protection. The MAX9546/MAX9547

are offered in a thermally enhanced 8-pin SO package

and specified over the -40°C to +85°C extended tem-

perature range.

Applications

Automotive Video

Car Navigation

In-Car Entertainment

Collision Avoidance/Rearview Cameras

Security/CCTV Video

Avionics/In-Flight Entertainment

Features

♦ Fault Detection (MAX9546)

♦ Loss-of-Signal Detection (MAX9547)

♦ Tolerate ±2V Ground-Level Shift between Source

and Load

♦ ±15kV ESD Protection (Human Body Model)

♦ ±8kV—IEC 1000-4-2 Contact Discharge

♦ ±15kV—IEC 1000-4-2 Air-Gap Discharge

♦ Preset 6dB Gain (MAX9546)

♦ Variable Receiver Gain (MAX9547)

♦ 7.5V to 10V Single-Supply Operation

Ordering Information

PART

PIN-

PACKAGE

PKG CODE

DESCRIPTION

MAX9546ESA+

8 SO-EP*

S8E-14

Driver

MAX9547ESA+

8 SO-EP*

S8E-14

Receiver

Note: These devices are specified for -40°C to +85°C temper-

ature range.

+Denotes a lead-free package.

*EP = Exposed paddle.

Pin Configuration appears at end of data sheet.

Typical Operating Circuit

FAULT

OUT-

CLAMP

OUT+

ZT+

ZT-

IN+

IOUT

LOS

IN-

IN

MAX9547

MAX9546