MAX4357 Datasheet, PDF (1/42 Pages) Maxim Integrated Products – 32 x 16 Nonblocking Video Crosspoint Switch with I/O Buffers

19-2209; Rev 0; 10/01
32 x 16 Nonblocking Video Crosspoint Switch
with I/O Buffers
General Description
The MAX4357 is a 32 ✕ 16 highly integrated video
crosspoint switch matrix with input and output buffers.
This device operates from dual ±3V to ±5V supplies or
from a single +5V supply. Digital logic is supplied from
an independent single +2.7V to +5.5V supply. All inputs
and outputs are buffered, with all outputs able to drive
standard 75Ω reverse-terminated video loads.
The switch matrix configuration and output buffer gain
are programmed through an SPI/QSPI™-compatible,
three-wire serial interface and initialized with a single
update signal. The unique serial interface operates in
two modes facilitating both fast updates and initializa-
tion. On power-up, all outputs are initialized in the dis-
abled state to avoid output conflicts in large-array
configurations.
Superior flexibility, high integration, and space-saving
packaging make this nonblocking switch matrix ideal
for routing video signals in security and video-on-
demand systems.
The MAX4357 is available in a 128-pin TQFP package
and specified over an extended -40°C to +85°C tem-
perature range.
Applications
Security Systems
Video Routing
Video-On-Demand Systems
Features
o 32 ✕ 16 Nonblocking Matrix with Buffered Inputs
and Outputs
o Operates from a ±3V, ±5V, or +5V Supply
o Each Output Individually Addressable
o Individually Programmable Output Buffer Gain
(A_V = +1V/V or +2V/V)
o High-Impedance Output Disable for Wired-OR
Connections
o 0.1dB Gain Flatness to 12MHz
o Minimum -62dB Crosstalk, -110dB Isolation at
6MHz
o 0.05%/0.1° Differential Gain/Differential Phase
Error
o Low 220mW Power Consumption (0.43mW per
Point)
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX4357ECD
-40°C to +85°C 128 TQFP
Pin Configuration appears at end of data sheet.
Functional Diagram
Typical Operating Circuit
CAMERAS
IN0
OUT0
IN1
MAX4357
OUT1
IN31
OUT15
MONITOR
MONITOR
MONITOR
IN0
IN1
IN2
IN31
RESET
DIN
SCLK
UPDATE
CE
MAX4357
32 x 16
SWITCH MATRIX
POWER-ON THERMAL
RESET
SHUTDOWN
DISABLE ALL OUTPUTS
512 ₁₆
DECODE LOGIC
SERIAL
INTERFACE
LATCHES
MATRIX REGISTER
112 BITS
UPDATE REGISTER
16 BITS
A0-A3 MODE
AV*
OUT0
AV*
OUT1
AV*
OUT2
AV*
OUT15
16
VCC
VEE
AGND
VDD
DGND
DOUT
AOUT
*AV = +1V/V OR +2V/V
SPI/QSPI are trademarks of Motorola, Inc.
________________________________________________________________ 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.