GX4201 Wideband, Monolithic 1x1
Video Crosspoint Switch
DATA SHEET
FEATURES
•
-3 dB bandwidth, 300 MHz with C
L
= 0 pF
•
off isolation at 100 MHz, 80 dB
•
differential phase and gain at 4.43 MHz, 0.01
°
&
0.02%
•
800
µ
W disabled power consumption
•
input signal levels from -2 V to +3 V
•
logic input compatible with TTL and 5 V CMOS
•
open collector TALLY output
FUNCTIONAL BLOCK DIAGRAM
TALLY
CIRCUIT DESCRIPTION
The GX4201 is a wideband 1x1 video crosspoint implemented
in bipolar monolithic technology. The device is characterized
by excellent differential gain and phase in the enabled
state, and very high off-isolation in the disabled state. The
fully buffered unilateral signal path ensures negligible output
to input feedback while delivering minimal output switching
transients through make-before-break switching.
For use in NxM routing matrices, the device features a very
high, nearly constant input impedance, coupled with very
high output impedance in the disabled state. This allows
multiple GX4201's to be paralleled at the input and output
without additional circuitry. An open collector PNP to V
CC
TALLY output provides indication of crosspoint selection.
To maximize system bandwidth, an external current source
is used to bias the output device of the crosspoint. One
external current source is required per output bus. For less
demanding applications, a load resistor can be used in
place of the output current source, causing a slight increase
in differential phase. Non-additive mixing will occur on the
output bus if more than one paralleled GX4201 is enabled
at a time.
The GX4201 is one of a series of wideband video crosspoints
utilizing Gennum's proprietary LSI process.
APPLICATIONS
TALLY
OFF
ON
IN
X
OUT
EN
PATENT PENDING
TRUTH TABLE
EN
0
1
OUT
HIGH Z
IN
•
•
•
•
•
very high quality video switching
HDTV
computer graphics
RF switching/routing
PCM/data routing
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
Operating Temperature Range
Storage Temperature Range
Value
±7.5
V
0° C
≤
T
A
≤
70° C
-65° C
≤
T
S
≤
150° C
260° C
-5.5 V
≤
V
IN
≤
5.5 V
-0.5 V
≤
V
L
≤
5.5 V
12mA
2 mA
EN
V
EE
V
CC
0UT
4
5
1
8
PIN CONNECTIONS
TOP VIEW
EN
PIN 1
8
GND
IN
GND
4
5
TALLY
Lead Temperature
(Soldering, 10 Sec)
Analog Input Voltage
Logic Input Voltage
Output Load Current
High Level TALLY Output Current
GND
IN
GND
TALLY
V
EE
V
CC
OUT
8 PIN SOIC
8 PIN DIP
Document No. 510 - 74 - 5
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-2055
Japan Branch: B-201 Miyamae Village, 2-10-42, Miyamae, Suginami-ku, Tokyo 168, Japan
tel. (03) 3247-8838
fax (03) 3247-8839
GENNUM [ GENNUM CORPORATION ]
