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PDF GS1508-CTA Data sheet ( Hoja de datos )
| Número de pieza | GS1508-CTA | |
| Descripción | HDTV Cable Driver | |
| Fabricantes | ETC | |
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HD-LINX ™ GS1508
HDTV Cable Driver
FEATURES
• SMPTE 292M compliant
• dual cable driving outputs optimized for driving data
up to 1.485Gb/s
• ±7% tolerance output
• >17dB output return loss
• minimum external components
• seamless interface with the HD-LINX™ family of
products
• low power
• standard packaging
APPLICATIONS
1.485Gb/s HDTV Serial Digital Receiver Interfaces for:
Routers, Distribution Amplifiers, Switchers, and other
transmitting equipment.
DESCRIPTION
PRELIMINARY DATA SHEET
The GS1508 is a first generation very high speed bipolar
integrated circuit designed to drive two 75Ω co-axial
cables. The GS1508 is a SMPTE 292M compliant cable
driver that directly interfaces with other Gennum HDTV
devices and can also be used as a general purpose high
speed cable driver.
The GS1508 features two complementary outputs whose
amplitude is controlled within a precise ±7% variation. The
output amplitude can be varied by adjusting the RSET
resistor value.
The serial inputs can be AC coupled. The GS1508 is a low
power device that does not require external pull down
resistors. The GS1508 is packaged in an 8 pin SOIC and
operates from a single 5V power supply.
ORDERING INFORMATION
PART NUMBER
PACKAGE
GS1508-CKA
8 pin SOIC
GS1508-CTA
8 pin Tape and Reel
TEMPERATURE
0°C to 70°C
0°C to 70°C
BANDGAP REFERENCE AND BIASING CIRCUIT
RSET
SDI INPUT
DIFFERENTIAL
PAIR
SDI
PATENT PENDING
OUTPUT STAGE &
CONTROL
BLOCK DIAGRAM
SDO
SDO
Revision Date: March 2000
Document No. 522 - 02 - 03
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
1 page  
GS1508
1.000
SDO
0.800
0.600
SDO
0.400
0.200
Fig. 5 Static Protection Diodes
OUTPUT RETURN LOSS MEASUREMENT
To perform a practical return loss measurement, it is
necessary to force the GS1508 output to a DC high or low
condition. The actual measured return loss will be based on
the outputs being static at VCC or VCC-1.6V. Under normal
operating conditions the outputs of the GS1508 swing
between VCC-0.4V and VCC-1.2V, so the measured value of
return loss will not represent the actual operating return
loss.
A simple method of calculating the values of actual
operating return loss is to interpolate the two return loss
measurements. In this way, the values of return loss are
estimated at VCC-0.4V and VCC-1.2V based on the
measurements at VCC and VCC-1.6V.
The two values of return loss (high and low) will typically
differ by several decibels. If the measured return loss is RH
for logic high and RL for logic low, then the two values can
be interpolated as follows:
RIH = RH- (RH-RL)/4 and
RIL = RL+(RH-RL)/4
where RIH is the interpolated logic high value and RIL is the
interpolated logic low value.
For example, if RH = -18dB and RL = -14dB, then the
interpolated values are RIH = -17dB and RIL = -15dB.
OUTPUT AMPLITUDE ADJUSTMENT
The output amplitude of the GS1508 can be adjusted by
changing the value of the RSET resistor as shown in Figure 6
and Table 1. For an 800mVp-p output with a nominal ±7%
tolerance, a value of 53.6% is required. A ±1% SMT resistor
should be used.
The RSET resistor is part of the high speed output circuit of
the GS1508. The resistor should be placed as close as
possible to the RSET pin. In addition, PCB capacitance
should be minimized at this node by removing the PCB
groundplane beneath the RSET resistor and the RSET pin.
0.000
0.0000
0.0050
0.0100
0.0150
1 / RSET (mho)
0.0200 0.0250
Fig. 6 GS1508 Output Amplitude vs. 1/RSET
TABLE 1: RSET vs VOUT
RSET R
500.0
150.0
75.0
53.6
43.2
1/RSET
0.0020
0.0067
0.0133
0.0187
0.0231
OUTPUT SWING
0.095
0.298
0.575
0.785
0.937
NOTE: For reliable operation of the GS1508 over the full
temperature range, do not use an RSET value below 49.9Ω.
5
522 - 02 - 03
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet GS1508-CTA.PDF ] | |
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