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GS9028 Schematic ( PDF Datasheet ) - ETC

Teilenummer GS9028
Beschreibung Cable Driver with Two Adjustable Outputs
Hersteller ETC
Logo ETC Logo 




Gesamt 7 Seiten
GS9028 Datasheet, Funktion
GENLINX II GS9028 Cable Driver
with Two Adjustable Outputs
FEATURES
• SMPTE 259M compliant
• two complementary outputs, adjustable from 50 to
1000mVp-p into 75loads
• operational from DC to 622Mb/s
• nominal 470ps rise and fall times
• < ±7% output amplitude control
• 45% system power reduction over the GS9008
• no external pulldown resistors required
• input hysteresis
• operational down to 80mV input amplitude
• operates from a single +5 or -5 volt supply
• 8 pin SOIC
APPLICATIONS
4ƒsc, 4:2:2, and 4:4:4:4 serial digital video interfaces from
143Mb/s to 540Mb/s; general purpose high speed cable
driver applications.
DESCRIPTION
DATA SHEET
The GS9028 is a second generation bipolar integrated
circuit designed to drive two 75co-axial cables.
The GS9028 features two complementary outputs whose
amplitude is controlled within ± 7%. The output signal levels
are also adjustable from as low as 50mV to as high as
1000mV with little change in other performance parameters.
The output amplitude of the output stage is varied by
adjusting the RSET resistor value.
The GS9028 consumes 45% less system power than the
GS9008 and does not require external pulldown resistors
resulting in a smaller PCB footprint. Operational with input
amplitudes as low as 80mV, the GS9028 is a robust serial
interface device.
The GS9028 is packaged in an 8 pin SOIC and operates
from a single +5 or -5 volt supply.
ORDERING INFORMATION
PART NUMBER
PACKAGE
GS9028-CKA
8 pin SOIC
GS9028-CTA
8 pin SOIC Tape
TEMPERATURE
0°C to 70°C
0°C to 70°C
BANDGAP REFERENCE AND BIASING CIRCUIT
RSET
SDI INPUT
DIFFERENTIAL
PAIR WITH
SDI HYSTERESIS
OUTPUT STAGE
& RISE/FALL TIME
CONTROL CIRCUIT
SDO
SDO
BLOCK DIAGRAM
Revision Date: April 2000
Document No. 521 - 68 - 04
GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3
Tel. +1 (905) 632-2996 Fax. +1 (905) 632-5946 E-mail: [email protected]
www.gennum.com






GS9028 Datasheet, Funktion
The termination resistor (RT) value should be equal to the
characteristic impedance of the cable. Controlled
impedance traces should be used for the outputs and the
termination resistors should be placed near the GS9028.
The inductor (L) and resistor (R) are used to optimize the
output return loss and are PCB dependent. Typically, R
equals the transmission line characteristic impedance and
L is approximately 8.2nH.
OUTPUT AMPLITUDE ADJUSTMENT
The GS9028 outputs are adjustable from as low as 50mV to
as high as 1000mV. The output amplitude is set by the RSET
resistor connected to pin 4. The relationship between the
output amplitude (VOUT) and RSET is approximately given by
the equation below:
RSET = (1.3696 x ZO)/(2 x VOUT) - 5.5
where ZO is in ohms and VOUT is in volts.
The minimum value of RSET is 46. For 75cable and
800mV output amplitudes, the value of RSET is 59. Also,
note that the above formula assumes that the transmission
line is properly end terminated.
TYPICAL APPLICATION CIRCUIT
5
VEE
4
RSET
6
SDI
3
VEE
7 GS9028
2
SDI SDO
8
VCC
1
SDO
59
75
8.2nH 1µ
8.2nH 1µ
75 75 75
100n
VCC
10n
VCC
All resistors in ohms, all capacitors in farads, unless otherwise shown.
521 - 68 - 04
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