GS1508 GS1508-CKA GS1508-CTA

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GS1508 - GS1508
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HD-LINX GS1508
HDTV Cable Driver
PRELIMINARY DATA SHEET FEATURES SMPTE 292M compliant dual cable driving outputs optimized driving data 1.485Gb/s tolerance output >17dB output return loss minimum external components seamless interface with HD-LINXfamily products power standard packaging APPLICATIONS 1.485Gb/s HDTV Serial Digital Receiver Interfaces for: Routers, Distribution Amplifiers, Switchers, other transmitting equipment. DESCRIPTION GS1508 first generation very high speed bipolar integrated circuit designed drive co-axial cables. GS1508 SMPTE 292M compliant cable driver that directly interfaces with other Gennum HDTV devices also used general purpose high speed cable driver. GS1508 features complementary outputs whose amplitude controlled within precise variation. output amplitude varied adjusting RSET resistor value. serial inputs coupled. GS1508 power device that does require external pull down resistors. GS1508 packaged SOIC operates from single power supply. ORDERING INFORMATION
PART NUMBER GS1508-CKA GS1508-CTA PACKAGE SOIC Tape Reel TEMPERATURE 70°C 70°C
GS1508
BANDGAP REFERENCE BIASING CIRCUIT
RSET
INPUT DIFFERENTIAL PAIR
OUTPUT STAGE CONTROL
PATENT PENDING
BLOCK DIAGRAM
Revision Date: March 2000 GENNUM CORPORATION P.O. 489, Stn. Burlington, Ontario, Canada Tel. (905) 632-2996 Fax. (905) 632-5946 E-mail: info@gennum.com www.gennum.com
Document
ABSOLUTE MAXIMUM RATINGS
25°C unless otherwise indicated
PARAMETER Supply Voltage Input Voltage Range (any input) Operating Temperature Range
VALUE 5.5V -0.3 (VCC +0.3)V 70°C -65°C 150°C 300mW 260°C 2000V
GS1508
Storage Temperature Power Dissipation Lead Temperature (soldering, sec) Input Voltage
ELECTRICAL CHARACTERISTICS
70°C unless otherwise shown. Specifications assume 800mV output amplitude level settings into terminated transmission lines. Data Rate 1485Mb/s unless otherwise shown.
PARAMETER Supply Voltage System Power Consumption Supply Current Common Mode Input Voltage Range Common Mode Output Voltage Range
CONDITIONS
SYMBOL
4.75
5.00
5.25
UNITS
NOTES
TEST LEVEL
Driving cables
VCM,IN VCM,OUT
2.5+(VDIFF/2)
VCC-(VDIFF/2)
VCC-VOUT
ELECTRICAL CHARACTERISTICS
70°C unless otherwise shown. Specifications assume 800mV output amplitude levels into terminated transmission lines. Data Rate 1485Mb/s unless otherwise shown.
PARAMETER Serial Digital Rate Additive Jitter Differential Input Differential Output Output Rise/Fall Times Mismatch Output Rise/Fall Times Overshoot Duty Cycle Distortion Output Return Loss NOTES:
CONDITIONS
SYMBOL
1485
UNITS Mb/s psRMS
NOTES
TEST LEVEL
1485Mb/s VDIFF VOUT (20% 80%)
diff
5MHz 1485MHz
TEST LEVELS:
additive jitter measured using Pseudo Random sequence Measured with Gennum Evaluation Board (EB1508).
100% tested 25°C. Guaranteed design. Correlated Value. Tested with EB1508
CONNECTIONS
RSET
GS1508 VIEW
GS1508
DESCRIPTIONS
NUMBER SYMBOL SDI, RSET SDO, TYPE DESCRIPTION Serial data inputs (non-inverting inverting). Most negative supply voltage. Output amplitude control resistor. Most positive supply voltage. connected internally. Connect Ground. Used isolation. Serial data outputs (non-inverting inverting).
INPUT OUTPUT CIRCUITS
RSET
Fig. (Pins
Fig. (Pins
DETAILED DESCRIPTION
INPUT INTERFACING
SDI/SDI high impedance differential inputs. (See Figure equivalent input circuit). Several conditions must observed when interfacing these inputs:
GS1508
differential input signal amplitude must between 800mVpp. common mode voltage range must specified Characteristics table. 400mV input from GS1504 cable equalizer, this corresponds common mode voltage range between volts. input trace lengths longer than approximately 1cm, inputs should terminated shown Typical Application Circuit. GS1508 inputs self biased, allowing simple coupling device. serial digital HDTV, minimum capacitor value 4.7µF should used allow coupling pathological test signals. tantalum capacitor recommended.
OUTPUT INTERFACING
Fig. Output Optimized Waveform Symmetry L=8.2nH, R=75 (Typical ORL=13.5dB)
GS1508 outputs current mode, will drive 800mV into load. These outputs protected from accidental static damage with internal static protection diodes. SMPTE 292M standard requires that output cable driver have source impedance return loss least 15dB between 5Mhz 1.485GHz. order output circuit using GS1508 meet this specification, output circuit shown Typical Application Circuit recommended. values LCOMP CCOMP will vary depending layout, typical values 12nH 0.5pF respectively. small value CCOMP easily swamped parasitic capacitance, recommended that ground plane removed under GS1508 output circuitry (see Application Information section this data sheet further details). 4.7µF capacitor used coupling output GS1508. This value chosen ensure that pathological signals coupled without significant component occurring.
Fig. Output Optimized Return Loss L=12nH, C=0.5pF, R=75 (Typical ORL=18dB)
Figures show diagram GS1508 output different output compensation conditions. Figure shows GS1508 output optimized wideband return loss 18dB. Figure shows GS1508 output optimized output waveform symmetry. this case output exhibit return loss 15dB. When measuring return loss GS1508 output necessary take measurement both logic high logic output condition. This because output protection diodes varactor (voltage controlled capacitor) shown Figure Consequently, output capacitance GS1508 dependent logic state output.
GS1508
1.000
OUTPUT SWING
0.800
0.600
0.400
GS1508
0.200
Fig. Static Protection Diodes OUTPUT RETURN LOSS MEASUREMENT
0.000 0.0000
0.0050
0.0100
0.0150
0.0200
0.0250
RSET (mho)
perform practical return loss measurement, necessary force GS1508 output high condition. actual measured return loss will based outputs being static VCC-1.6V. Under normal operating conditions outputs GS1508 swing between VCC-0.4V VCC-1.2V, measured value return loss will represent actual operating return loss. simple method calculating values actual operating return loss interpolate return loss measurements. this way, values return loss estimated VCC-0.4V VCC-1.2V based measurements VCC-1.6V. values return loss (high low) will typically differ several decibels. measured return loss logic high logic low, then values interpolated follows: (RH-RL)/4 RL+(RH-RL)/4 where interpolated logic high value interpolated logic value. example, -18dB -14dB, then interpolated values -17dB -15dB.
OUTPUT AMPLITUDE ADJUSTMENT
Fig. GS1508 Output Amplitude TABLE RSET VOUT RSET 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: reliable operation GS1508 over full temperature range, RSET value below 49.9.
output amplitude GS1508 adjusted changing value RSET resistor shown Figure Table 800mVp-p output with nominal tolerance, value 53.6% required. resistor should used. RSET resistor part high speed output circuit GS1508. resistor should placed close possible RSET pin. addition, capacitance should minimized this node removing groundplane beneath RSET resistor RSET pin.
TYPICAL APPLICATION CIRCUIT
100n CCOMP LCOMP RSET 53.6
resistors ohms, capacitors farads, unless otherwise shown.
PECL INPUT
GS1508
GS1508
LCOMP CCOMP
TABLE Typical Application Circuit Component Values COMPONENT RSET LCOMP CCOMP VALUE 53.6 12nH 0.5pF 800mV Output trace impedance Typical value. Component value will vary depending layout. Typical value. Component value will vary depending layout. COMMENT
APPLICATION INFORMATION
LAYOUT
Special attention must paid component layout when designing serial digital interfaces HDTV. Figures through show artwork four layer printed circuit evaluation board GS1508. schematic shown Figure FR-4 dielectric used, however, controlled impedance transmission lines required traces longer than approximately 1cm. Note following artwork features used optimize performance: trace width rate signals closely matched component width minimize reflections change trace impedance ground plane removed under GS1508 output components minimize parasitic capacitance. ground plane removed under GS1508 RSET resistor minimize parasitic capacitance Input output connectors surface mounted inline eliminate transmission line stub caused mounting High speed traces curved minimize impedance changes change trace width.
GS1508 EVALUATION BOARD
100n
GS1508
RSET
EDGEMNT_BNC EDGEMNT_BNC 53.6 resistors ohms, capacitors farads, unless otherwise shown.
100n
EDGEMNT_BNC EDGEMNT_BNC
Fig. Schematic Diagram GS1508 Evaluation Board
Fig. Layer EB1508 Layout
Fig. Ground Layer EB1508 Layout
Fig. Power Layer EB1508 Layout
Fig. Bottom Layer EB1508 Layout
PACKAGE DIMENSIONS
5.00 MAX. 0.49 1.91
1.27
6.20 0.25
GS1508
0.25
0.60 3.81 ±0.05 spaces 1.27 ±0.05
8-pin SOIC dimensions millimetres
CAUTION
ELECTROSTATIC SENSITIVE DEVICES
OPEN PACKAGES HANDLE EXCEPT STATIC-FREE WORKSTATION
DOCUMENT IDENTIFICATION
PRELIMINARY DATA SHEET This product production. Gennum reserves right make changes product documentation.
REVISION NOTES:
Updated ordering information; Replaced evaluation board diagrams; Updated descriptions; Added note Table
latest product information, visit www.gennum.com
GENNUM CORPORATION
MAILING ADDRESS: P.O. 489, Stn. Burlington, Ontario, Canada Tel. (905) 632-2996 Fax. (905) 632-5946 SHIPPING ADDRESS: Fraser Drive, Burlington, Ontario, Canada
GENNUM JAPAN CORPORATION C-101, Miyamae Village, 2-10-42 Miyamae, Suginami-ku Tokyo 168-0081, Japan Tel. (03) 3334-7700 Fax. (03) 3247-8839 GENNUM LIMITED Long Garden Walk, Farnham, Surrey, England Tel. (0)1252 (0)1252
Gennum Corporation assumes responsibility circuits described herein makes representations that they free from patent infringement. Copyright August 1998 Gennum Corporation. rights reserved. Printed Canada.

GS1508 GS1508-CKA GS1508-CTA

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