MAX498 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – Quad/Triple, SPDT, RGB Switches with 250MHz Video Buffer Amplifiers

19-1143; Rev 0; 10/96
EVAALVUAAILTAIOBNLEKIT
Quad/Triple, SPDT, RGB Switches
with 250MHz Video Buffer Amplifiers
_______________General Description
The MAX498/MAX499 are high-speed, quad/triple, sin-
gle-pole/double-throw video switches with on-board
closed-loop buffer amplifiers. The buffer amplifiers fea-
ture +6dB gain (AVCL = 2V/V), 250MHz -3dB band-
width, 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 high-
impedance state. Channel selection and output
enable/disable are controlled by four TTL/CMOS-
compatible 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.
________________________Applications
Video Switching and Routing
Broadcast-Quality Composite-Video Multiplexing
Workstations
Video Editing
Broadcast and High-Definition TV Systems
Multimedia Products
Medical Imaging
____________________________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
MAX498CWI
MAX499CWG
TEMP. RANGE
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
28 SO
24 SO
_________________Pin Configurations
TOP VIEW
IN1A 1
GND 2
IN2A 3
GND 4
IN3A 5
VCC 6
V_EE 7
IN1B 8
GND 9
IN2B 10
GND 11
IN3B 12
MAX499
24 GND
23 LE
22 EN
21 A0
20 _CS
19 OUT1
18 VCC
17 VEE
16 OUT2
15 N.C.
14 OUT3
13 N.C.
SO
MAX498 appears at end of data sheet.
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