GX4201 Wideband, Monolithic 1x1
Video Crosspoint Switch
DATA SHEET
FEATURES
CIRCUIT DESCRIPTION
TheGX4201isawideband1x1videocrosspointimplemented
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.
• -3 dB bandwidth, 300 MHz with CL = 0 pF
• off isolation at 100 MHz, 80 dB
• differential phase and gain at 4.43 MHz, 0.01° &
0.02%
• 800 µW 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
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 VCC
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.
FUNCTIONAL BLOCK DIAGRAM
TALLY
X
OUT
IN
The GX4201 is one of a series of wideband video crosspoints
utilizing Gennum's proprietary LSI process.
EN
PATENT PENDING
TRUTH TABLE
APPLICATIONS
• very high quality video switching
• HDTV
• computer graphics
• RF switching/routing
• PCM/data routing
EN
0
OUT
HIGH Z
IN
TALLY
OFF
1
ON
ABSOLUTE MAXIMUM RATINGS
Parameter
Value
±7.5 V
PIN CONNECTIONS
Supply Voltage
TOP VIEW
Operating Temperature Range
0° C ≤ TA ≤ 70° C
Storage Temperature Range
-65° C ≤ TS ≤ 150° C
8
PIN 1
GND
EN
Lead Temperature (Soldering, 10 Sec)
260° C
EN
VEE
GND
IN
1
4
8
IN
VEE
VCC
Analog Input Voltage
-5.5 V ≤ V ≤ 5.5 V
GND
TALLY
IN
VCC
0UT
GND
TALLY
5
5
Logic Input Voltage
-0.5 V ≤ VL ≤ 5.5 V
12mA
OUT
4
Output Load Current
8 PIN SOIC
8 PIN DIP
High Level TALLY Output Current
2 mA
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