 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| GB4600 Monolithic Unity Gain Video Buffer DATA SHEET 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 (I L = 10 mA or I L = 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 DESCRIPTION The GB4600 is a high performance, monolithic unity gain video buffer made on Gennum's proprietary LSI process. The device features 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 directly connected to VEE. 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 board layouts. FUNCTIONAL BLOCK DIAGRAM INPUT VIDEO SWITCH OUTPUT APPLICATIONS * Input and output buffering in wide crosspoint matrices * Inter-board video signal buffering ENABLE ENABLE * Inter-system video signal buffering CURRENT SET I-SET AVAILABLE PACKAGING 8 pin SOIC PIN CONNECTIONS ORDERING INFORMATION ENABLE V EE V CC OUTPUT 1 1 2 2 3 3 4 4 5 8 7 6 6 7 8 5 GND INPUT NC I-SET Part Number Package Temperature Range GB4600-CKA 8 SOIC 0 to 70C Revision Date: February 2003 Document No. 13421 - 5 GENNUM CORPORATION P Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-5946 .O. Japan Branch: A-302, Miyamae Village, 2-10-42, Miyamae, Suginami-ku, Tokyo 168, Japan tel. (03) 3334-7700 fax. (03) 3247-8839 ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Operating Temperature Range Storage Temperature Range Lead Temperature (soldering 10 sec.) Analog Input Voltage Logic Input Voltage VALUE 7.5 V 0C to 70C -65C to 150C 260C -5.5 V V IN 5.5 V -0.5 V VL 5.5 V ELECTROSTATIC SENSITIVE DEVICES DO NOT OPEN PACKAGES OR HANDLE EXCEPT AT A STATIC-FREE WORKSTATION CAUTION ELECTRICAL CHARACTERISTICS PARAMETER Supply Voltage Supply Current DC SUPPLY VS = 5 V, T A = 0 to 70C, RL = 10kW, CL = 47 pF, R- SET = open circuit unless otherwise shown. SYMBOL VS I+ II+ II + (off) I - (off) CONDITIONS MIN. 4.5 - TYP. 5.0 30 30 16 16 0 16 12 50 100 1 -0.04 100 120 3.0 1.1 2 5 0.02 0.02 80 250 100 350 170 MAX. 5.5 37 37 20 20 50 2.2 15 100 0.8 5.0 - UNITS V mA mA mA mA mA mA V mA mV mV/C ns ms V V mA dB MHz MHz MW pF W pF % deg dB V/ms V/ms V/ms V/ms R-SET = 0 W R-SET = 0 W Enable = 0 Enable = 0 Unclipped Extremes -1.8 - Analog Output Voltage STATIC Analog Input Bias Current Output Offset Voltage Output Offset Voltage Drift Chip Enable Time Chip Disable Time LOGIC Logic Input Thresholds VOUT IVBIAS VOS DVOS t ON tOFF VIH VIL I BIAS I.L. F.R. FPBW RIN CIN ROUT COUT dg dp TA = 25C - 5 2.0 - Enable Bias Current Insertion Loss Frequency Response (0.1dB) Full Power (-3dB) Input Resistance Input Capacitance DYNAMIC Output Resistance Output Capacitance Differential Gain Differential Phase Off Isolation at 30 MHz Enable = 0, TA = 25C = 100 kHz, TA = 25C VIN = 1 V p-p CL = 27 pF VIN = 1 V p-p, 1.0 - = 3.58 MHz = 3.58 MHz VIN = 1 V p-p 75 - +SR R-SET = 0 (I minimum) VIN = 3 V p-p, CL = 100 pF RS = 12 W VIN = 3 V p-p, CL = 100 pF RS = 12 W Slew Rate -SR +SR -SR 13421 - 5 2 +5V 0.1 10K 3 VIDEO INPUT 7 8 GB4600 2 0.1 -5V 1 4 5 27 TALLY OUT GX4201 VIDEO OUT TALLY OUT GX4201 VIDEO OUT 75 TALLY OUT CL GX4201 VIDEO OUT *R-SET -5V All resistors are in ohms, all capacitors in microfarads unless otherwise stated * 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 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. +5V 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. CHIP ENABLE +5V 10 K 1 4 5 RS CL 0.1 RL 10 K 4 0.1 1 COMLINEAR CLC110 0.1 3 VIDEO INPUT 7 8 GB4600 2 8 VIDEO OUT (75 W ) 5 0.1 -5V 75 0.1 -5V Max. Min. I-SET -5V All resistors are in ohms, all capacitors in microfarads unless otherwise stated TEST CIRCUIT 3 13421 - 5 TYPICAL PERFORMANCE CURVES FOR THE GB4600 40 VIN = 1V p-p 1.5 1.0 0.5 0 50 OFF ISOLATION (dB) 60 ISET = MAX. GAIN (dB) -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 70 80 RS = 27W CL = 47pF V IN = 1V p-p 10 10 I SET = MIN. 90 100 1 10 100 300 -3.5 100 200200 FREQUENCY (MHZ) FREQUENCY (MHz) Fig. 1 1.5 1.0 0.5 0 Off - Isolation vs Frequency 0.05 Fig. 3 I-SET Bandwidth vs Frequency RS = 12W V BLANKING = 0V 0.04 V LUMINENCE = 0.714V VIN = 40 IRE GAIN (d B) -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 -3.5 1 1 10 100 100 dg/dp RS = 18W CL = 100pF VIN = 1V p-p 0.03 dg 0.02 0.01 dp 0 1 3 5 10 FREQUENCY (MHz) FREQUENCY (MHz) Fig. 2 80 75 70 Full Power Bandwidth (100 pF) vs Frequency Fig. 4 Differential Gain and Phase vs Frequency AMBIENT TEMPERATURE ( C) o VS = 5.0V (STILL AIR) 65 60 55 50 45 40 VS = 5.3V VS = 5.5V 100 1K 10K 1M R-SET (W) Fig. 5 SOIC Derating Curves 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. REVISION NOTES: Remove reference to DIP Package. Remove associated part number from DIP package. 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 May 1991 Gennum Corporation. All rights reserved. Printed in Canada. 13421 - 5 4 |
Price & Availability of GB4600-CKA
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |