19-1143; Rev 0; 10/96
KIT
ATION
EVALU
E
AILABL
AV
Quad/Triple, SPDT, RGB Switches
with 250MHz Video Buffer Amplifiers
________________________Applications
____________________________Features
o High Speed:
250MHz Small-Signal -3dB Bandwidth
135MHz Full-Power -3dB Bandwidth
o 70MHz 0.1dB Gain Flatness
o 1250V/µs Slew Rate
o 12ns to 0.1% Settling Time
o 0.03°/0.06% Differential Phase/Gain Error
o 2pF Input Capacitance
o 3ns Channel-Switching Time
o 120mVp-p Channel-Switching Transient
o Three-State Output Allows Large Switch Arrays
o Directly Drives 50Ω or 75Ω Back-Terminated
Cables
______________Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX498CWI
0°C to +70°C
28 SO
MAX499CWG
0°C to +70°C
24 SO
_________________Pin Configurations
Video Switching and Routing
Broadcast-Quality Composite-Video Multiplexing
TOP VIEW
Workstations
IN1A 1
24 GND
Video Editing
GND 2
23 LE
Broadcast and High-Definition TV Systems
Multimedia Products
Medical Imaging
IN2A 3
22 EN
GND 4
21 A0
IN3A 5
MAX499
20 CS
VCC 6
19 OUT1
VEE 7
18 VCC
IN1B 8
17 VEE
GND 9
16 OUT2
IN2B 10
15 N.C.
GND 11
14 OUT3
IN3B 12
13 N.C.
SO
MAX498 appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX498/MAX499
_______________General Description
The MAX498/MAX499 are high-speed, quad/triple, single-pole/double-throw video switches with on-board
closed-loop buffer amplifiers. The buffer amplifiers feature +6dB gain (AVCL = 2V/V), 250MHz -3dB bandwidth, 70MHz 0.1dB gain flatness, and 1250V/µs slew
rate. Fast switching time (3ns) and fast settling time
(12ns for a 4V step) make these devices excellent
choices for a wide variety of video applications. The low
differential gain/phase errors (0.03%/0.06°) and wide
bandwidth make them ideal for both composite-video
and RGB applications. The amplifiers are capable of
delivering ±2.5V into back-terminated 50Ω or 75Ω
cables, and they deliver ±2V to a 75Ω load, allowing
multiple cables to be driven from a single output.
For implementation of large switch arrays, a low-power
disable mode places the amplifier outputs in a highimpedance state. Channel selection and output
enable/disable are controlled by four TTL/CMOScompatible logic inputs. Each video input is isolated by
an AC-ground pin, which minimizes channel-to-channel
capacitance and reduces crosstalk to 90dB at 10MHz.
The four-channel MAX498 dissipates 390mW (typical)
from ±5VDC power supplies with all output buffers
enabled. Power consumption is reduced to 130mW with
all buffers disabled. The corresponding dissipation for
the three-channel MAX499 is 300mW enabled and
100mW disabled.
