19-1143; Rev 0; 10/96
Qu a d /Trip le , S P DT, RGB S w it c h e s
w it h 2 5 0 MHz Vid e o Bu ffe r Am p lifie rs
8/MAX49
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
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-
♦ High Speed:
250MHz Small-Signal -3dB Bandwidth
135MHz Full-Power -3dB Bandwidth
ture +6dB gain (A
= 2V/V), 250MHz -3dB band-
VCL
♦ 70MHz 0.1dB Gain Flatness
width, 70MHz 0.1dB gain flatness, and 1250V/µs slew
rate. Fast switching time (3ns) and fast settling time
(12ns for a 4V s te p ) ma ke the s e d e vic e s e xc e lle nt
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
d e live ring ± 2.5V into b a c k-te rmina te d 50Ω or 75Ω
cables, and they deliver ±2V to a 75Ω load, allowing
multiple cables to be driven from a single output.
♦ 1250V/µs Slew Rate
♦ 12ns to 0.1% Settling Time
♦ 0.03°/0.06% Differential Phase/Gain Error
♦ 2pF Input Capacitance
♦ 3ns Channel-Switching Time
♦ 120mVp-p Channel-Switching Transient
♦ Three-State Output Allows Large Switch Arrays
For implementation of large switch arrays, a low-power
disable mode places the amplifier outputs in a high-
imp e d a nc e s ta te . Cha nne l s e le c tion a nd outp ut
e na b le /d is a b le a re c ontrolle d b y 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.
♦ Directly Drives 50Ω or 75Ω Back-Terminated
Cables
______________Ord e rin g In fo rm a t io n
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 thre e -c ha nne l MAX499 is 300mW e na b le d a nd
100mW disabled.
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
28 SO
MAX498CWI
MAX499CWG
24 SO
________________________Ap p lic a t io n s
_________________P in Co n fig u ra t io n s
Video Switching and Routing
Broadcast-Quality Composite-Video Multiplexing
Workstations
TOP VIEW
24 GND
IN1A
GND
IN2A
GND
1
2
3
4
5
6
7
8
9
23
22
21
20
LE
Video Editing
EN
A0
Broadcast and High-Definition TV Systems
Multimedia Products
MAX499
IN3A
CS
Medical Imaging
V
CC
OUT1
19
18
17
16
15
14
V
EE
V
CC
IN1B
GND
V
EE
OUT2
N.C.
IN2B 10
GND 11
OUT3
IN3B
13 N.C.
12
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