19-3873; Rev 0; 10/05
Differential Video Interface Chipset
General Description
Features
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.
♦ Fault Detection (MAX9546)
♦ Loss-of-Signal Detection (MAX9547)
♦ Tolerate ±±2 ꢀrounꢁ-Leꢂel Sꢃift ꢄetꢅeen Source
anꢁ Loaꢁ
♦ Specifies Common-Moꢁe Balance (MAX9546)
♦ ±15ꢆ2 ꢇSD ꢈrotection (ꢉuman Boꢁd Moꢁel)
♦ ±ꢊꢆ2V—ꢇC 1ꢋꢋꢋ-4-± Contact Discꢃarge
♦ ±15ꢆ2V—ꢇC 1ꢋꢋꢋ-4-± Air-ꢀap Discꢃarge
♦ ꢈreset 6ꢁB ꢀain (MAX9546)
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
♦ 2ariaꢄle Receiꢂer ꢀain (MAX9547)
♦ 7.52 to 1ꢋ2 Single-Suppld Operation
Ordering Information
short to a high battery condition (V
= +16V) or
BAT
ꢈ—N-
ꢈACKAꢀꢇ
ground. The MAX9546 specifies the common-mode
balance (CMB) of the differential outputs.
ꢈART
ꢈKꢀ CODꢇ DꢇSCR—ꢈT—ON
MAX9546ꢀSA+ 8 SO-ꢀP*
MAX9547ꢀSA+ 8 SO-ꢀP*
S8ꢀ-14
S8ꢀ-14
Driver
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-.
Receiver
Note: These devices are specified for -40°C to +85°C temper-
ature range.
+Denotes lead-free package.
*EP = Exposed paddle.
Pin Configuration appears at end of data sheet.
The MAX9546/MAX9547 operate from a 7.5V to 10V
single supply. Both devices include 15kV ꢀSD 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.
Typical Operating Circuit
V
CC
V
CC
Applications
ZT+
Automotive Video
MAX9547
MAX9546
Car Navigation
ZT-
IN+
OUT+
OUT-
In-Car ꢀntertainment
V
OUT
IN
IOUT
LOS
IN-
Collision Avoidance/Rearview Cameras
Security/CCTV Video
CLAMP
FAULT
Avionics/In-Flight ꢀntertainment
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.