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 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.
The GX4201 is one of a series of wideband video crosspoints utilizing Gennum's proprietary LSI process.
-3dB bandwidth, 300MHz with CL = 0pF
off isolation at 100MHz, 80dB
differential phase and gain at 4.43MHz, 0.01° & 0.02%
800mW disabled power consumption
input signal levels from -2V to +3V
logic input compatible with TTL and 5V CMOS
open collector TALLY output
Very high quality video switching; HDTV; computer graphics; RF switching/routing; PCM/data routing
