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GS9029 Schematic ( PDF Datasheet ) - ETC

Teilenummer GS9029
Beschreibung GENLINX GS9029 Quad Output Serial Digital Video Cable Driver
Hersteller ETC
Logo ETC Logo 




Gesamt 8 Seiten
GS9029 Datasheet, Funktion
GENLINX II GS9029 Quad Output
Serial Digital Video Cable Driver
FEATURES
• SMPTE 259M compliant
• four isolated outputs (two complimentary pairs),
adjustable from 50mV-1000mV into 75loads
• operational from 143Mb/s to 540Mb/s and beyond
• nominal 500ps rise/fall times
• precise ±7.5% output amplitudes
• 40% system power reduction over GS9007
• 75on-chip input termination resistors
• input hysteresis
• operational down to 80mV input amplitude
• superior output isolation
• "Bus Through" expansion port for fan out
requirements
APPLICATIONS
4ƒsc, 4:2:2 and 4:4:4:4 serial digital video co-axial
transmission interfaces from 143 to 540Mb/s; General
purpose cable driving applications (co-axial cable or UTP).
DESCRIPTION
DATA SHEET
The GS9029 is a second generation bipolar integrated
circuit designed to drive four 75co-axial cables.
The GS9029 features two pairs of complementary outputs
whose amplitude is controlled within ±7.5%. The output
signal levels are also adjustable from 50mVp-p up to
1000mVp-p with little change in other performance
parameters. The amplitude of the output stage is varied by
adjusting the RSET resistor value. The patented current
mode outputs ensure superior output return loss and
minimal over shoot. The rise/fall time circuitry allows wide
range operation and provides symmetrical balanced
outputs to reject power supply noise. In addition high output
isolation ensures that the cable driver outputs are not
affected by the performance or status of other outputs.
Operational with input amplitudes as low as 80mV, the
GS9029 provides a robust serial interface.
The GS9029 is packaged in a 16 pin narrow SOIC and
operates from a single +5 or -5 volt supply. Typical system
power consumption is 320mW which is 40% less than the
GS9007.
ORDERING INFORMATION
PART NUMBER
PACKAGE
GS9029-CKD
16 pin SOIC Narrow
GS9029-CTD
16 pin SOIC Tap
TEMPERATURE
0°C to 70°C
0°C to 70°C
RSET0
RSET1
SDI/T
SDI/T
SDI
SDI
BANDGAP REFERENCE & BIASING CIRCUIT
75 75
SDO0
SDO0
INPUT
DIFFERENTIAL
PAIR WITH
HYSTERESIS
OUTPUT STAGE &
RISE/FALL TIME
CONTROL CIRCUIT
SDO1
SDO1
BLOCK DIAGRAM
Revision Date: February 2000
Document No. 521 - 97 - 02
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






GS9029 Datasheet, Funktion
DETAILED DESCRIPTION
INPUT INTERFACING
SDI/SDI are high impedance differential inputs. Two
conditions must be observed when interfacing to these
inputs:
1. The input signal amplitude must be between 80mV and
1000mV.
2. The common mode voltage range must be as specified
in the DC Characteristics Table (page 2). For 800mV
input amplitude signals, this corresponds to a common
mode voltage range between 2.8 and 4.6 volts.
Figures 6 and 7 illustrate two methods of interfacing the
GS9029 to the Gennum GS9024 (Cable Equalizer), GS9035
(Reclocker) or the GS9025 (Receiver).
Figure 6 illustrates the simplest interface and is
recommended when the trace lengths between the driver
and the GS9029 are less than 0.5 in.
++
GS9029
__
SDI/T
10nF
SDI/T
VCC
Fig. 6 Interfaces using Internal SDI Terminations
When trace lengths become longer than 0.5in. and data
rates greater than 360Mb/s, electromagnetic reflections
begin to affect signal integrity. To minimize reflections,
controlled impedance traces and source and end
terminations should be used as shown in Figure 7. Although
terminations on both sides reduce the signal swing by a
factor of two, the GS9029 is designed to meet this need
with ultra low input amplitude requirements (as low as
80mV).
VCC
10nF
75
+
_
75
+
GGSS99002298
_
SDI/T
SDI/T
10nF
OUTPUT INTERFACING
Figure 8 illustrates the recommended interface for ac
coupled outputs.
VCC
10nF
RT
+
GS9028
_
GS9029
RT
RT = R = ZO
R
L 1µF
L 1µF
R
Fig. 8 Interfaces for AC Coupled Outputs
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 GS9029.
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 GS9029 outputs are adjustable from as low as 50mV to
as high as 1000 mV. The output amplitudes are set by the
RSET0 and the RSET1 resistors respectively. The relationship
between the approximate output amplitude (VOUT) and RSET
is given by the equation below:
RSET=
1----.--1---5---4-----×-----Z----O--
2 × VOUT
where ZO is in ohms and VOUT is in volts.
The minimum value of RSET is 43.2. For 75cable and
800mV output amplitudes, the value of RSET is 54.9. Also,
note that the above formula assumes that the transmission
line is properly end terminated.
Fig. 7 Interfaces using Internal SDI Terminations
Connected to AC Ground
The GS9029 can accept AC coupled input signals with no
extra configuration required.
521 - 97 - 02
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