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GX4201 Wideband, Monolithic 1x1 Video Crosspoint Switch
DATA SHEET
FEATURES * -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 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 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. 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 TA 70 C -65 C TS 150 C 260 C -5.5 V VIN 5.5 V -0.5 V VL 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 VCC 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
ELECTRICAL CHARACTERISTICS
PARAMETER Supply Voltage DC SUPPLY Supply Current (not including external current load) Analog Output Voltage Swing STATIC Analog Input Bias Current Output Offset Voltage
(VS = 5V DC, 0C < TA < 70C, I L = 6 mA) SYMBOL VS I+ EN=1 EN=0 IEN=1 EN=0 VOUT I BIAS VOS VOS / T t ON tOFF VIH VIL I BIAS(EN) Control input to appearance of signal at output. Control input to disappearance of signal at output. 1 0 EN = 0 2.0 0.3 0.8 2 V V A TA = 25C -10 12 10 Extremes before clipping occurs -2 3 V A mV V/C ns s CONDITIONS MIN 4.5 TYP 5 13.5 80 12.5 80 MAX 5.5 17 140 16 140 UNITS V mA A mA A
Output Offset Voltage DriftCrosspoint Turn-On Time LOGIC Crosspoint Turn-Off Time Logic Input Thresholds Enable Bias Current TALLY Output Insertion Loss Bandwidth (-3dB) See Fig. 1 Input Resistance DYNAMIC Input Capacitance Output Resistance Output Capacitance See Fig. 5 Differential Gain Differential Phase See Fig. 6 Off Isolation See Fig. 4 Slew Rate
-
-25
-80
-
200
400
0.5
1.0
-
VOH I.L. B.W. RIN CIN ROUT COUT dg dp
EN = 1, I O = 1mA 1V p-p sine or sq.wave,TA=25 oC at 100 kHz R L=100K, C L =30pF small signal CL = 0 pF EN = 1 EN = 0 EN = 1 EN = 0 at 3.58 MHz VIN = 40 IRE Enabled GX4201 on output = 100 MHz VIN = 1V p-p
4.80
4.89
4.93
V
0.015 1.0 -
0.025 300 3.0 1.1 7 1.1 80
0.040 0.04 0.04 -
dB MHz M pF pF % degrees dB
+SR -SR VIN = 3V p-p (CL = 0 pF)
250 250
400 350
V/s
ORDERING INFORMATION
PART NUMBER GX4201-CKA GX4201-CDA GX4201-CTA PACKAGE TYPE 8 PIN SOIC 8 PIN DIP 8 PIN SOIC TAPE TEMPERATURE RANGE 0 to 70C 0 to 70C 0 to 70C
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TYPICAL PERFORMANCE CURVES OF THE GX4201 For all graphs, VS = 5 V DC and TA = 25C. The curves shown below represent typical batch sampled results.
Gain (dB)
24 21 18 15 12 9 6 3 0 -3 -6 1 10 100 1K
Phase (degrees)
0 -0.3 -0.6
Load Capacitance 10 pF
22 pF
-0.9 -1.2 -1.5
10 pF
47 pF 82 pF
22 pF -1.8 47 pF -2.1 82 pF -2.4 -2.7 -3.0 1 2 3 4 5 6 7 8 9 10
Frequency (MHz)
Frequency (MHz)
Fig. 1 Gain vs Frequency
Fig. 2 Phase vs Frequency
Gain (dB)
0.1 0.05 0 -0.05
Off Isolation (dB)
120
V IN = 1V p-p
110
R L = 10
-0.1 -0.15 -0.2 -0.25
External Series Resistance = 30 CL = 33 pF
100
90
Load = 1 xpt on O/P to GND
(See test circuits)
-0.3 -0.35 -0.4 1 10 100 1K 70 10 20 30 50 80 100 80
Frequency (MHz)
Frequency (MHz)
Fig. 3 Gain vs Frequency
Fig. 4 Off Isolation vs Frequency
continued over
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Input Cap. (pF)
1.8 1.7 1.6 1.5 1.4 1.3 1.2
Disabled O/P Cap. (pF)
1.4
EN = 1 CL = 30 pF
1.3
1.2
EN = 0
1.1 1.1 1.0 0.9 0.8 1 10 100 1K 1.0 -2 .0
-1.5
-1.0
-0.5
0
+0.5
+1.0
+1.5
+2.0
Frequency (MHz)
Output Bias (V)
Fig. 5 CIN vs Frequency
Diff. Gain Diff. Phase
+0.05 +0.04 +0.03 +0.02
Fig. 6 COUT vs Bias
Diff. Gain Diff. Phase
+0.05
V IN = 40 IRE at 4.43 MHz V LUM = VBLANK + 0.714 V Blanking Level is clamped to VBIAS dg %
+0.04
V IN = 40 IRE at 4.43 MHz V LUM = VBLANK + 0.714 V Blanking Level 0 V DC R = 10 k L dp
+0.03
+0.01 0 -0.01
dg %
R L = 10 K
-0.01 -0.03 -0.04 -0.05
+0.02
dp
+0.01
-1.6
-1.2
-0.8
-0.4
0
+0.4
+0.8
0
Input Bias (V)
1
2
3
4
5
6
7
8
9 10
Fig. 7 dg/dp vs Input Bias
Diff. Gain Diff. Phase
-0.18 -0.16 -0.14 -0.12
Frequency (MHz)
Fig. 8 dg/dp vs Frequency
= 4.43 MHz, 40 IRE Blanking Level 0V DC dg %
-0.10 -0.08 -0.06 -0.04 -0.02
dp dp
0
dg %
+0.02 100 1K 10K
RL ()
Fig. 9 dg/dp vs RL 4
510 - 74 - 5
1 -5.5 V +5.5 V 2 3
8 7 6 5 5.5 K
+ +
10 10
470 4
Fig. 10 Burn-in Test Circuit
1 -5 V +5 V 2 3
8 7 6 5 VOUT
+ +
VCTRL 10 10
4
200 mV/div
V CRTL
1 2 3 4
8 7 6 -5 V 5 6mA
10pF
VOUT
10 mV/div
74LS02
1 s/div
Fig. 11a Switching Transient Test Circuit
Fig. 11b
Switching Transient
OFF DEVICE
1 -5 V +5 V 0.1 0.1 2 3 4
8 7 6 INPUT
1 -5 V 2 3 0.1 0.1 4
8 7 6 5 OUTPUT 1K INPUT
5 OUTPUT
+5 V
ON DEVICE
IL
1K
1 2 3 0.1 0.1 4
8 7 6 5 0.1 180 2 x BFR96
IL LOAD 10
180
ADJUST FOR IL = 6mA
2 x BFR96
180
-5 V
180 ADJUST FOR IL = 6mA 0.1
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 10 load resistor as shown in the passive load circuit.
-5 V
Active Load Fig. 12 Off-isolation Test Circuits
Passive Load
All capacitors in farads, all resistors in ohms unless otherwise stated.
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+5 V EN BA EN AA 1 2
NOTE 1
8 7 6 5
1 2 3 4
8 7 6 5 4.7 K OUT A Repeat for Each Crosspoint TALLY Output
3 4
*
EN BB EN AB 1 2 3 4 8 7 6 5 1 2 3 4 8 7 -5 V 6 5 6mA
NOTE 2
OUT B 5V + IN A 5V + IN B -5 V
IC
6mA
NOTE 2
All capacitors in F, all resistors in unless otherwise shown.
Fig. 13 Application Circuit 2 x 2 Matrix using Four GX4201
NOTES: 1. 2.
* All decoupling capacitors are 0.1 F, 50 V.
680
R 100
1.8 K
6mA 6
can be implemented by the following circuit. Choose a transistor with / at 6 mA T is 800MHz. T
0.1 -5 V
3.
Alternatively, an 820 resistor may be used. The insertion loss will be increased to 0.1 dB.
AVAILABLE PACKAGING
8 pin DIP 8 pin SOIC - TAPE
8 pin SOIC
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. (c) Copyright AUG.1989 Gennum Corporation. Revision Date: January 1993. All rights reserved. Printed in Canada.
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