GB4600 GENNUM | Alldatasheet

Document overview

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Technical content

The GB4600 is a high performance, monolithic unity gain video buffer made on Gennum's proprietar y LSI process. The device featur es a stable wideband topology capable of driving high capacitance video busses. Optimal system power/bandwidth can be achieved by using the high/low current mode select (I-SET). In addition, the GB4600 can be disabled by taking the ENABLE pin to ground. The ENABLE input is TTL and 5 V CMOS compatible. The GB4600 operates from ±4.5 to ±5.5 V power supplies and typically draws 30 mA of current when I-SET is not connected. The supply current drops by approximately 50% when I-SET is dir ectly connected to V EE. A typical application for the GB4600 is interfacing Gennum's wide range of video crosspoint switches. The 8 pin SOIC packaging is ideally suited for space restricted boar d

  • Input and output buffering in wide crosspoint matrices
  • Inter-board video signal buffering
  • Inter-system video signal buffering ORDERING INFORMA TION Part Number Package Temperatur e Range GB4600-CKA 8 SOIC 0° to 70°C

FEATURES

  • wideband, unity gain, stable operation (± 0.1 dB at 100 MHz when CL = 27 pF) (full power BW = 120 MHz when CL = 47 pF).
  • selectable high and low current operating modes (IL = 10 mA or IL = 20 mA)
  • drives high capacitance loads (CL = 180 pF) to 70 MHz at -3 dB.
  • extremely low differential phase and gain
  • convenient 8 pin SOIC packaging
  • 100 mW disabled power consumption GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-5946 Japan Branch: A-302, Miyamae V illage, 2-10-42, Miyamae, Suginami-ku, Tokyo 168, Japan tel. (03) 3334-7700 fax. (03) 3247-8839 APPLICA TIONS

DESCRIPTION

51 GNDENABLE

Document No. 13421 - 5 Revision Date: February 2003 FUNCTIONAL BLOCK DIAGRAM VIDEO SWITCH ENABLE INPUT OUTPUT ENABLE CURRENT SET I-SET layouts.

Supply Voltage ±7.5 V Operating Temperature Range 0°C to 70°C Storage Temperature Range -65°C to 150°C Lead Temperature (soldering 10 sec.) 260°C Analog Input Voltage -5.5 V £ VIN £ 5.5 V Logic Input Voltage -0.5 V £ VL £ 5.5 V ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS Supply Voltage VS ±4.5 ±5.0 ±5.5 V Supply Current I+ -3 0 37 mA I- -3 0 37 mA I+ R-SET = 0 W -1 6 20 mA I- R-SET = 0 W -1 6 20 mA I+ (off) Enable = 0 - 0 - mA I- (off) Enable = 0 - 16 50 mA Analog Output Voltage VOUT Unclipped Extremes -1.8 - 2.2 V Analog Input Bias Current IVBIAS -1 2 - mA Output Offset Voltage VOS TA = 25°C- 5 - 15 mV Output Offset Voltage Drift DVOS - 50 100 mV/°C Chip Enable Time tON - 100 - ns Chip Disable Time tOFF -1 - ms Logic Input Thresholds VIH 2.0 - - V VIL - - 0.8 V Enable Bias Current IBIAS Enable = 0, TA = 25°C - - 5.0 m A Insertion Loss I.L. ƒ = 100 kHz, TA = 25°C - -0.04 - dB Frequency Response (±0.1dB) F.R. VIN = 1 V p-p CL = 27 pF - 100 - MHz Full Power (-3dB) FPBW VIN = 1 V p-p, - 120 - MHz Input Resistance RIN 1.0 3.0 - M W Input Capacitance CIN - 1.1 - pF Output Resistance ROUT -2 - W Output Capacitance COUT -5 - pF Differential Gain dg ƒ = 3.58 MHz - 0.02 - % Differential Phase dp ƒ = 3.58 MHz - 0.02 - deg Off Isolation at 30 MHz VIN = 1 V p-p 75 80 - dB +SR R-SET = 0 (I minimum) - 250 - V/ms VIN = 3 V p-p, CL = 100 pF -SR RS = 12 W - 100 - V/ms +SR VIN = 3 V p-p, CL = 100 pF - 350 - V/ms -SR RS = 12 W - 170 - V/ms Slew Rate LOGIC STATIC DC SUPPLY DYNAMIC ELECTRICAL CHARACTERISTICS VS = ±5 V, T A = 0° to 70°C, RL = 10kW, CL = 47 pF, R- SET = open circuit unless otherwise shown. CAUTION ELECTROSTATIC SENSITIVE DEVICES DO NOT OPEN PACKAGES OR HANDLE EXCEPT AT A STATIC-FREE WORKSTATION 13421 - 5

0.1 10 K -5V +5V 0.1 CHIP ENABLE -5V RL Min.Max. 0.1 -5V +5V 0.1

4 VIDEO OUT

(75 ) 10 K 0.1 I-SET CL W COMLINEAR CLC110 The circuit shown above uses the GB4600 as an input buffer driving several GX4201 video crosspoint ICs. The GB4600 is capable of driving loads up to 100 pF to a -3 dB bandwidth of 80 MHz. For lighter loads, the bandwidth is extended to over 100 MHz. Capacitor CL is used to shape the response in conjunction with the 27 W series resistor from pin 4. The value shown will give a -1 dB response at 100 MHz with a total load capacitance (fixed plus actual) of 47 pF. In order to disable the GB4600, pin 1 is driven from the TALLY outputs of the GX4201s. When all crosspoints are OFF, the voltage on pin 1 will be 0 volts, disabling the GB4600. Whenever any crosspoint is selected, the voltage on pin 1 rises to +5 volts and turns on the buffer. This configuration minimizes the current drain when a group of crosspoints are turned off. For other applications, the ENABLE input on the GB4600 may be controlled by any TTL or 5 volt CMOS device. A unique feature of the GB4600 is that its current drain can be reduced by adjusting the value of the resistor on the I-SET input, pin 5. If R-SET is made zero ohms (a direct connection to -VEE) then the supply current drops 50% from 36 mA to 18 mA. A reduced current will reduce the bandwidth as shown in Figure 3. For values of RS = 27 W and CL = 47 pF, the -1 dB bandwidth shrinks from 100 MHz at maximum current to 80 MHz at minimum current. As with any high frequency circuit, careful board layout with ample ground plane is critical. All resistors are in ohms, all capacitors in microfarads unless otherwise stated All resistors are in ohms, all capacitors in microfarads unless otherwise stated TEST CIRCUIT * The current will be maximum if the pin 5 is left open circuit. Any value of resistance from pin 5 to -VEE will reduce the current. The minimum current (50% of max.) will occur when R-SET = 0 W. TYPICAL APPLICATION CIRCUIT 7 4 8 2 5 GB4600 3 1 VIDEO INPUT GX4201 0.1 GX4201 GX4201 VIDEO OUT VIDEO OUT VIDEO OUT TALLY OUT TALLY OUT TALLY OUT 10K -5V -5V +5V 0.1 CL*R-SET 13421 - 5

TYPICAL PERFORMANCE CURVES FOR THE GB4600 0.05 0.04 0.03 0.02 0.01 1.5 1.0 0.5 -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 -3.5 10 200 1 100 VIN = 1V p-p CL = 47pF RS = 12W VIN = 1V p-p RS = 18W CL = 100pF VBLANKING = 0V VLUMINENCE = 0.714V VIN = 40 IRE FREQUENCY (MHZ) Fig. 3 I-SET Bandwidth vs FrequencyFig. 1 Off - Isolation vs Frequency 1 10 100 300 100 1.5 1.0 0.5 -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 -3.5 10 100 200 FREQUENCY (MHz) dg dp dg/dp 100 FREQUENCY (MHz) 1 10 1 3 5 10 FREQUENCY (MHz) ISET = MAX. ISET = MIN. OFF ISOLATION (dB) GAIN (d B) GAIN (dB) VIN = 1V p-p RS = 27W R-SET (W) Fig. 2 Full Power Bandwidth (100 pF) vs Frequency Fig. 4 Differential Gain and Phase vs Frequency Fig. 5 SOIC Derating Curves 100 1K 10K 1M AMBIENT TEMPERATURE (oC) (STILL AIR) VS = ±5.0V VS = ±5.3V VS = ±5.5V DOCUMENT IDENTIFICATION 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 May 1991 Gennum Corporation. All rights reserved. Printed in Canada. REVISION NOTES: 13421 - 5 Remove reference to DIP Package. Remove associated part number from DIP package.