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GENLINXTM GS9004C
Serial Digital Cable Equalizer
DATA SHEET
FEATURES * automatic cable equalization * typically greater than 350 m of high quality cable at 270 Mb/s * typically 300 m of high quality cable at 360 Mb/s * improved jitter response vs cable length * drop in replacement for GS9004B * capability to drive 50 loads (to VTT) * fully compatible with SMPTE 259M and operational to 400 Mb/s * signal strength indicator * output 'eye' monitor * 14 pin SOIC packaging * single +5 or -5 volt power supply operation APPLICATIONS * Front-end cable equalization for digital video systems * Input equalization for serial digital distribution amplifiers, routers, production switchers and other receiving equipment ORDERING INFORMATION
Part Number GS9004CCKB GS9004CCTB Package Type 14 pin SOIC 14 pin SOIC Tape Temperature Range 0oC to 70oC 0oC to 70oC
GS9004C 6 SIGNAL STRENGTH INDICATOR FILTER CONTROL AGC 7 CAPACITOR
DEVICE DESCRIPTION The Gennum GS9004C is an improved monolithic automatic cable equalizer developed for SMPTE/EBU scrambled NRZI Serial Di g i t a l Video signals. While there are no plans to discontinue the GS9004C, Gennum has developed a successor product with improved features and performance called the GS9024. The GS9024 is recommended for new designs. This device features DC restoration to pass the Pathological Test Signals and fully automatic equalization in order to meet the SMPTE 259M Serial Interface Standard. The DATA and DATA outputs typically deliver 800 mV (p-p) equalized signals into 50 loads (to V TT). These signals can be used to feed cable driver circuits for Serial Distribution Amplifier applications. This device also incorporates an analog signal strength indicator (SSI) which provides a 0.5 V to 0 V output relative to VCC, indicating the amount of equalization being applied to the signal. The GS9004C features an OUTPUT 'EYE' MONITOR (OEM), which allows verification of signal integrity after equalization, prior to reslicing. Operating with a single +5 or -5 volt supply, the GS9004C typically draws 52 mA of current.
PEAK DETECTOR VOLTAGE VARIABLE FILTER LOGIC COMPARATOR
IN+ IN-
8 9
14 13
DC RESTORER
DATA DATA
3 OUTPUT 'EYE' MONITOR
FUNCTIONAL BLOCK DIAGRAM
Document No. 521 - 72 - 00
GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 tel. +1 (905) 632-2996 fax. +1 (905) 632-5946 Web Site: www.gennum.com E-mail: info@gennum.com
ABSOLUTE MAXIMUM RATINGS
PARAMETER Supply Voltage (VS) Input Voltage Range (any input) DC Input Current (any one input) Power Dissipation Operating Temperature Range Storage Temperature Range Lead Temperature (soldering, 10 sec) VALUE 5.5 V VCC+0.5 to VEE -0.5 V 10 mA 500 mW 0C TA 70C -65C T S 150C 260C VCC (GND) VCC (GND) OEM VCC (GND) NC SSI
1 2 3 4 5 6 7 14 13 12 11 10 9 8
GS9004C PIN CONNECTIONS
DATA DATA GND 1 (VEE1) GND (VEE) GND (VEE) IN - IN+
PIN DESCRIPTIONS (I = INPUT, O = OUTPUT, S = SUPPLY function)
PIN NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 SYMBOL VCC (GND) VCC(GND) OEM VCC(GND) NC SSI AGC IN+ INGND(V EE) GND(V EE) GND1(VEE1 ) DATA DATA O I I I S S S O O I/O S S O S DESCRIPTION Most positive supply voltage (ECL outputs) Most positive supply voltage (DC Restore/Eye Monitor) Output 'Eye' Monitor Most positive supply voltage (Equalizer) No Connection Signal Strength Indicator AGC capacitor connection Non-inverting signal Inverting signal Most negative supply voltage Most negative supply voltage Most negative supply voltage for EYE MONITOR DATA (true) DATA (inverse)
AGC
GS9004C DC ELECTRICAL CHARACTERISTICS
PARAMETER Supply Voltage Power Consumption Supply Current Serial Data Output - High - Low SYMBOL VS PD
Conditions: V S = 5 V, TA = 0o to 70o C, RL = 100 , to (V CC -2) volts, unless otherwise shown
CONDITIONS Operating Range With MONITOR active
MIN 4.75 -1.025 -1.8
TYP 5.0 285 330 52 60 -
MAX 5.25 360 415 72 83 -0.88 -1.6
UNITS V mW mW mA mA V V
NOTES
IS With MONITOR active VOH
MIN
TA = 25C TA = 25C
with respect to V CC with respect to VCC
VOL MAX
GS9004C AC ELECTRICAL CHARACTERISTICS
PARAMETER Output Signal Swing Input Resistance(IN+, IN-) Input Capacitance(IN+, IN-) Output 'Eye' Monitor Signal Strength Output GS9004C GAIN SYMBOL VO RIN CIN VOEM VSS AV tJ TA = 25C TA = 25C
Conditions: VS = 5 V, TA = 0o to 70 oC, RL = 100 , to (VCC -2) volts, unless otherwise shown
CONDITIONS TA = 25C
MIN 700 4k 4.4 30
TYP 800 5k 1.3 40 33
MAX 900 5 -
UNITS mV pF mV p-p V dB
NOTES see fig. 8 see fig. 8 see Fig. 5
RL = 50, To VCC
=135 MHz JITTER (Added) 270Mb/s TA = 25C, 300m of 8281 cable. 600 ps p-p
see Fig. 4 Test setup 1 see Fig. 7
521 - 72 - 00
2
GS9004C CABLE EQUALIZER - DETAILED DEVICE DESCRIPTION The GS9004C Cable Equalizer is a bipolar integrated circuit used to equalize SMPTE 259M signals from a co-axial cable. The device is implemented as a fourteen pin SOIC, powered from a single five volt supply. With an operating frequency up to 400 Mb/s, the equalizer consumes about 285 mW of power. The Serial Digital signal is connected to the input (pins 8, 9) either differentially or single ended with the unused input being decoupled. The equalized signal is generated by passing the cable signal through a voltage variable filter having a characteristic which closely matches the inverse cable loss characteristic. Additionally, the variation of the filter characteristic with control voltage is designed to imitate the variation of the inverse cable loss characteristic as the cable length is varied. The amplitude of the equalized signal is monitored by a peak detector circuit which produces an output current with a polarity corresponding to the difference between the desired peak signal level and the actual peak signal level.
+5V 10 + 1.0 150 GND 68 1.8p
This output is integrated by an external AGC filter capacitor (AGC CAP pin 7), providing a steady control voltage for the voltage variable filter. A separate signal strength indicator output, (SSI pin 6), proportional to the amount of AGC, is also provided. As the filter characteristic is varied automatically by the application of negative feedback, the amplitude of the equalized signal is kept at a constant level which is representative of the original amplitude at the transmitter. The equalized signal is then DC restored, effectively restoring the logic threshold of the equalized signal to its correct level irrespective of shifts due to AC coupling. As the final stage of signal conditioning, a comparator converts the analog output of the DC restorer to a regenerated digital output signal having pseudo-ECL voltage levels. These outputs, DATA and DATA, are available from pins 13 and 14 respectively. An OUTPUT 'EYE' MONITOR (pin 3) allows verification of signal integrity after equalization, prior to reslicing.
68 VCC SDO4
SDO3 1.0 100 5 6 100
100n
1.8p
GND SI SI VCC
SO2 4 SO2 3 SO1 2 SO1 1
150 68
7 100n 8
SDO2 1.0 150 68 1.8p
100n 1 VCC VCC 50 VCC VCC 100n 100n OEM + VCC SSI 10 100n
100n
2 3 4 5 6 7
VCC VCC OEM VCC N/C SSI AGC
DATA DATA GND1 GND GND IN IN+
14 13 12 11
680
VCC
GS9007
680
OEM SDO1 1.0 1.8p 150
10 9 8 47p 75 75 SDI 18n 47p 113
GS9004C
All resistors in ohms, all capacitors in microfarads, all inductors in henries unless otherwise stated.
Fig. 1 Test Circuit
8281 CABLE CABLE DRIVER DATA CABLE DRIVER
ANRITSU ME522A OR TEKTRONIX TSG422
D.U.T.
VERTICAL IN
CLOCK OSCILLOSCOPE
TRIGGER IN
Fig. 2 Test Set-up 1
3
521 - 72 - 00
TYPICAL PERFORMANCE CURVES (unless otherwise shown VS = 5V, TA = 25C)
80 0
40 35
75 5
VS = 5.25 V GAIN (dB)
30 25 20 15 10 5
CURRENT (mA)
70 0
V S = 5.0 V
65 5
V S = 4.75 V
60 0 0
10
20
30
40
50
60
70
0
0.1
1
10
100
500
TEMPERATURE
FREQUENCY (MHz)
Fig. 3 Supply Current vs Temperature
Fig. 4 Equalizer Gain vs Frequency
5.0
900
SERIAL OUTPUT (mV)
4.9
850
VS = 5.25 V
800
4.8
SSI VOLTAGE (V)
4.7
750
VS = 5.0 V VS = 4.75 V
4.6
700
4.5
650
4.4
0
50
100
150
200
250
300
350
600 0 10 20 30 40 50 60 70
CABLE LENGTH (m) (8281)
TEMPERATURE (C)
Fig. 5 Signal Strength Output Voltage vs Input Cable Length
Fig. 6 Data and Data Output Voltage vs Temperature
1000 900 800 700
JITTER p-p (ps)
270 Mb/s 223 PRN Signal Source
600 500 400 300 200 100 0 0 50 100 150 200 250 300 350
INPUT CABLE LENGTH (m) (8281)
Fig. 7 Additive Jitter vs Input Cable Length at 270 Mb/s
521 - 72 - 00
4
R2 68 +5V 10 + R3 150 C6 1.0 C8 1.8p R5 68 VCC J3 SDO4
GND
100n
GS9004C
VCC VCC R1 50 C3 100n 1 VCC
C4 100n
2 3 4 5 C7 100n + C5 10
VCC VCC OEM VCC N/C SSI AGC
VCC C2 100n VCC TP1 SSI
J2 OEM
6 7
14 DATA 13 DATA 12 GND1 11 GND 10 GND 9 IN 8 IN+ C12 47p 75 R9 75
R7 100
5 6 7
GND SI SI VCC
SO2 4 SO2 3 SO1 2 SO1 1
R6 150
C10 1.0
C11 1.8p R8 68
J4 SDO4
JP1 OEM R11 680 113
R10 100 R12 680 VCC
8
GS9007
R13 150
C13 1.0
C16 1.8p R14 68
J5 SDO4
C15 47p
C14 100n R15 150
R15 1.0
C18 1.8p
J6 SDO4
J1 SDI
L1 18n
All resistors in ohms, all capacitors in microfarads unless otherwise stated.
Fig. 8 Typical Application Circuit
CAUTION
ELECTROSTATIC SENSITIVE DEVICES
DO NOT OPEN PACKAGES OR HANDLE EXCEPT AT A STATIC-FREE WORKSTATION
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
MAILING ADDRESS: P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 Tel. +1 (905) 632-2996 Fax +1 (905) 632-2814 SHIPPING ADDRESS: 970 Fraser Drive, Burlington, Ontario, Canada L7L 5P5
REVISION NOTES: New information added to Device Description
GENNUM JAPAN CORPORATION C-101, Miyamae Village, 2-10-42 Miyamae, Suginami-ku, Tokyo 168-0081, Japan Tel. +81 (3) 3334-7700 Fax: +81 (3) 3247-8839 GENNUM UK LIMITED Centaur House, Ancells Business Park, Ancells Road, Fleet, Hampshire, UK GU13 8UJ Tel. +44 (1252) 761 039 Fax +44 (1252) 761 114
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 April 1996 Gennum Corporation. All rights reserved.
Printed in Canada.
5
521 - 72 - 00

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