GX4201 Wideband, Monolithic 1x1 Video Crosspoint Switch

Transcription

1 GX21 Wideband, Monolithic 1x1 Video Crosspoint Switch DATA SHEET FEATURES - db bandwidth, MHz with C L = pf off isolation at 1 MHz, db differential phase and gain at. MHz,.1 &.2% µw disabled power consumption input signal levels from -2 V to V logic input compatible with TTL and V CMOS open collector TALLY output FUNCTIONAL BLOCK DIAGRAM IN EN PATENT PENDING X TALLY OUT CIRCUIT DESCRIPTION The GX21 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 GX21'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 GX21 is enabled at a time. The GX21 is one of a series of wideband video crosspoints utilizing Gennum's proprietary LSI process. TRUTH TABLE EN OUT TALLY HIGH Z OFF 1 IN ON APPLICATIONS very high quality video switching HDTV computer graphics RF switching/routing PCM/data routing ABSOLUTE MAXIMUM RATINGS Parameter Supply Voltage Value ±7. V PIN CONNECTIONS Operating Temperature Range C T A 7 C TOP VIEW Storage Temperature Range - C T S 1 C Lead Temperature (Soldering, 1 Sec) 2 C Analog Input Voltage -. V V IN. V Logic Input Voltage -. V V L. V EN V EE V CC UT 1 GND IN GND TALLY EN V EE V CC OUT PIN GND IN GND TALLY Output Load Current High Level TALLY Output Current 12mA 2 ma PIN SOIC PIN DIP Document No GENNUM CORPORATION P.O. Box 9, Stn A, Burlington, Ontario, Canada L7R Y tel. (9) fax: (9) 2-2 Japan Branch: B-21 Miyamae Village, 2-1-2, Miyamae, Suginami-ku, Tokyo 1, Japan tel. () 27- fax () 27-9

2 ELECTRICAL CHARACTERISTICS (V S = ±V DC, C < T A < 7 C, I L = ma) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage ±V S ±. ± ±. V DC I EN= ma SUPPLY Supply Current EN= - 1 µa (not including external I- EN= ma current load) EN= - 1 µa Analog Output V OUT Extremes before clipping Voltage Swing occurs -2 - V STATIC Analog Input Bias I BIAS Current µa Output Offset Voltage V OS T A = 2 C -1-1 mv Output Offset Voltage V OS / T µv/ C Drift- Crosspoint t ON Control input to appearance - 2 ns Turn-On Time of signal at output. LOGIC Crosspoint t OFF Control input to disappearance µs Turn-Off Time of signal at output. Logic Input V IH V Thresholds V IL - -. V Enable I BIAS(EN) EN = -. 2 µa Bias Current TALLY Output V OH EN = 1, I O = 1mA..9.9 V Insertion Loss I.L. 1V p-p sine or sq.wave,t A =2 o C at 1 khz =1K, C L =pf.1.2. db Bandwidth (-db) See Fig. 1 B.W. small signal C L = pf - - MHz Input Resistance R IN EN = MΩ DYNAMIC Input Capacitance C IN EN = pf Output Resistance R OUT EN = Ω Output Capacitance See Fig. C OUT EN = pf Differential Gain dg at. MHz - -. % Differential Phase See Fig. dp V IN = IRE - -. degrees Off Isolation Enabled GX21 on output - - db See Fig. ƒ = 1 MHz V IN = 1V p-p Slew Rate SR 2 - -SR V IN = V p-p (C L = pf) 2 - V/µs ORDERING INFORMATION PART NUMBER PACKAGE TYPE TEMPERATURE RANGE GX21-CKA PIN SOIC to 7 C GX21-CDA PIN DIP to 7 C GX21-CTA PIN SOIC TAPE to 7 C 2

3 TYPICAL PERFORMANCE CURVES OF THE GX21 For all graphs, V S = ± V DC and T A = 2 C. The curves shown below represent typical batch sampled results. Gain (db) 2 Phase (degrees) Load Capacitance 1 pf pf pf pf pf 2 pf pf pf K Fig. 1 Gain vs Frequency Fig. 2 Phase vs Frequency Gain (db) Off Isolation (db) V IN = 1V p-p External Series Resistance = Ω C L = pf 1 9 Load = 1 xpt on O/P to GND = 1Ω (See test circuits) K Fig. Gain vs Frequency Fig. Off Isolation vs Frequency continued over 1-7 -

4 Input Cap. (pf) 1. Disabled O/P Cap. (pf) C L = pf EN = EN = K Diff. Gain Diff. Phase Fig. C IN vs Frequency V IN = IRE at. MHz V LUM = V BLANK.71 V Blanking Level is clamped to V BIAS Diff. Gain Diff. Phase... Output Bias (V) Fig. C OUT vs Bias V IN = IRE at. MHz V LUM = V BLANK.71 V Blanking Level V DC = 1 kω = 1 K Input Bias (V) Fig. 7 dg/dp vs Input Bias Fig. dg/dp vs Frequency Diff. Gain Diff. Phase ƒ =. MHz, IRE Blanking Level V DC K 1K (Ω) Fig. 9 dg/dp vs 1-7 -

5 1 -. V. V K Fig. 1 Burn-in Test Circuit 1 V mv/div V CRTL V CTRL V OUT ma 1pF V OUT 1 mv/div 7LS2 1 µs/div Fig. 11a Switching Transient Test Circuit Fig. 11b Switching Transient OFF DEVICE 1 V ON DEVICE INPUT OUTPUT I L 1K 2 x BFR9 V I L INPUT OUTPUT 1K 1 1 ADJUST FOR = ma I L LOAD 1 2 x BFR9 1 1 ADJUST FOR = ma I L NOTE: Off-isolation can be increased by eliminating the signal path through the power supplies. This is demonstrated by replacing the enabled crosspoint with a 1Ω load resistor as shown in the passive load circuit. Active Load Fig. 12 Off-isolation Test Circuits Passive Load All capacitors in farads, all resistors in ohms unless otherwise stated

6 V EN BA EN AA NOTE 1 * EN BB EN AB.7 K ma NOTE 2 Repeat for Each Crosspoint TALLY Output OUT A OUT B - V IN A - V IN B ma NOTE 2 All capacitors in µf, all resistors in Ω unless otherwise shown. Fig. 1 Application Circuit 2 x 2 Matrix using Four GX21 I C NOTES: 1. * All decoupling capacitors are µf, V. 2. ma can be implemented by the following circuit. Choose a transistor with ß / ƒ T at ma ƒ T is MHz.. Alternatively, an 2Ω resistor may be used. The insertion loss will be increased to db. 1 R 1. K AVAILABLE PACKAGING pin DIP pin SOIC pin SOIC - TAPE CAUTION ELECTROSTATIC SENSITIVE DEVICES DO NOT OPEN PACKAGES OR HANDLE EXCEPT AT A STATIC-FREE WORKSTATION DOCUMENT IDENTIFICATION PRODUCT PROPOSAL This data has been compiled for market investigation purposes only, and does not constitute an offer for sale. ADVANCE INFORMATION NOTE This product is in development phase and specifications are subject to change without notice. Gennum reserves the right to remove the product at any time. Listing the product does not constitute an offer for sale. PRELIMINARY DATA SHEET The product is in a preproduction phase and specifications are subject to change without notice. DATA SHEET The product is in production. Gennum reserves the right to make changes at any time to improve reliability, function or design, in order to provide the best product possible. Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. Copyright AUG.199 Gennum Corporation. Revision Date: January 199. All rights reserved. Printed in Canada