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GS1528 HD-LINXTM II Multi-Rate SDI Dual Slew-Rate Cable Driver
GS1528 Data Sheet Features * * * * * * * SMPTE 292M, SMPTE 344M and SMPTE 259M compliant dual coaxial cable driving outputs with selectable slew rate 50 differential PECL input seamless interface to other HD-LINXTM II family products Pb-free and RoHS Compliant single 3.3V power supply operation operating temperature range: 0C to 70C Description The GS1528 is a second generation high-speed bipolar integrated circuit designed to drive one or two 75 co-axial cables at data rates up to 1.485Gb/s. The GS1528 provides two selectable slew rates in order to achieve compliance to SMPTE 259M, SMPTE 344M and SMPTE 292M. The GS1528 accepts a LVPECL level differential input that may be AC coupled. External biasing resistors at the inputs are not required. Power consumption is typically 160mW using a 3.3V power supply. This component and all homogeneous subcomponents are ROHS compliant.
Applications * SMPTE 292M, SMPTE 344M and SMPTE 259M Coaxial Cable Serial Digital Interfaces.
BANDGAP REFERENCE AND BIASING CIRCUIT
RSET
SDI SDI
INPUT DIFFERENTIAL PAIR
SDO OUTPUT STAGE & CONTROL SDO
SD/HD
Functional Block Diagram
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GS1528 Data Sheet
Contents
Features ........................................................................................................................1 Applications...................................................................................................................1 Description ....................................................................................................................1 1. Electrical Characteristics ...........................................................................................3 1.1 Absolute Maximum Ratings ............................................................................3 1.2 DC Electrical Characteristics ..........................................................................3 1.3 AC Electrical Characteristics ...........................................................................4 2. Pin Out ......................................................................................................................5 2.1 Pin Assignment ...............................................................................................5 2.2 Pin Descriptions ..............................................................................................5 2.3 Input/Output Circuits .......................................................................................6 3. Detailed Description ..................................................................................................7 3.1 Input Interfacing ..............................................................................................7 3.2 SD/HD .............................................................................................................7 3.3 Output Interfacing ...........................................................................................7 3.4 Output Return Loss Measurement ..................................................................9 3.5 Output Amplitude Adjustment .......................................................................10 4. Application Information............................................................................................11 4.1 PCB Layout ...................................................................................................11 4.2 Typical Application Cirucit .............................................................................11 5. Package Dimensions ..............................................................................................12 5.1 Ordering Information .....................................................................................12 6. Revision History ......................................................................................................13
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1. Electrical Characteristics
1.1 Absolute Maximum Ratings
TA = 25C unless otherwise indicated
Parameter
Supply Voltage Input ESD Voltage Storage Temperature Range Input Voltage Range (any input) Operating Temperature Range Power Dissipation Lead Temperature (soldering, 10 sec)
Value
-0.5V to 3.6 VDC 500V -50C < Ts < 125C -0.3 to (VCC +0.3)V 0C to 70C 300mW 260C
CAUTION The GS1528 is sensitive to electrostatic discharge. Use extreme caution, observing all ESD-prevention practices, during handling and assembly. The SDI inputs of the GS1528 must be protected from electrostatic discharge and electrical overstress during the handling and operation of circuit assemblies
1.2 DC Electrical Characteristics
Table 1-1: DC Electrical Characteristics
VDD = 3.3V, TA = 0C to 70C, unless otherwise shown
Parameter
Supply Voltage Power Consumption Supply Current Output Voltage Input Voltage SD/HD Input
Conditions
Symbol
VCC
Min
3.135 - - - 1.6 + VSDI/2 2.4 -
Typ
3.3 160 48 VCC - VOUT - - -
Max
3.465 - - - VCC - VSDI/2 - 0.8
Units
V mW mA - V V V
Notes
5%
Test Levels
3 5 1 6 5 7 7
TA = 25C TA = 25C Common mode Common mode
PD s VCMOUT VCMIN VIH VIL
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1.3 AC Electrical Characteristics
Table 1-2: AC Electrical Characteristics
VDD = 3.3V, TA = 0C to 70C, unless otherwise shown
Parameter
Serial input data rate Additive jitter
Conditions
Symbol
DRSDO
Min
- - -
Typ
- 15 25 - - - - - - 800
Max
1.485 - - 220 800 30 30 8 - 850
Units
Gb/s psp-p psp-p ps ps ps ps % dB mVp-p
Notes
2
Test Levels
1 1 1
1.485Gb/s 270Mb/s
Rise/Fall time
SD/HD=0 SD/HD=1
tr, tf tr, tf tr, tf
- 400 - - -
20% to 80% 20% to 80%
1 1 1 1 1
Mismatch in rise/fall time Duty cycle distortion Overshoot Output Return Loss Output Voltage Swing Single Ended into 75 external load RSET = 750 Input Voltage Swing TEST LEVELS Differential
ORL VOUT
15 750
1
7 1
VSDI
300
-
2000
mVp-p
1
1. Production test at room temperature and nominal supply voltage with guardbands for supply and temperature ranges. 2. Production test at room temperature and nominal supply voltage with guardbands for supply and temperature ranges using correlated test. 3. Production test at room temperature and nominal supply voltage. 4. QA sample test. 5. Calculated result based on Level 1, 2, or 3. 6. Not tested. Guaranteed by design simulations. 7. Not tested. Based on characterization of nominal parts. 8. Not tested. Based on existing design/characterization data of similar product. 9. Indirect test. NOTES: 1. Tested on CB1528 board from 5MHz to 1.435GHz 2. The input coupling capacitor must be set accordingly for lower data rates.
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GS1528 Data Sheet
2. Pin Out
2.1 Pin Assignment
SDI SDI VEE RSET 1 2 3 4 8 7 6 5 SDO SDO SD/HD VCC
GS1528 8 PIN SOIC TOP VIEW
Figure 2-1: 8-Pin SOIC
2.2 Pin Descriptions
Table 2-1: Pin Descriptions Pin Number
1,2 4 6
Name
SDI, SDI RSET SD/HD
Type
PECL INPUT INPUT LOGIC INPUT
Description
Serial digital differential input. External output amplitude control resistor. Output slew rate control. When HIGH, the output will meet SMPTE259M rise/fall time specifications. When LOW, the serial outputs will meet SMPTE292M rise/fall time specifications. Serial digital differential output. Most negative power supply connection. Connect to GND. Most positive power supply connection. Connect to +3.3V.
7, 8 3 5
SDO, SDO VEE VCC
OUTPUT POWER POWER
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2.3 Input/Output Circuits
VCC
SDI
SDI
VCC 10k 5k 10k
10k
Figure 2-2: Differential Input Stage (SDI/SDI)
Vcc
SDO SDO
REF
Figure 2-3: Differential Output Stage (SDO/SDO) REF derived using RSET
VCC
SD/HD
On Chip Reference
Figure 2-4: Slew Rate Select Input Stage (SD/HD)
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GS1528 Data Sheet
3. Detailed Description
3.1 Input Interfacing
SDI/SDI are high impedance differential inputs. (See Figure 2-1 1 for equivalent input circuit). Several conditions must be observed when interfacing to these inputs: 1. The differential input signal amplitude must be between 300 and 2000mVpp. 2. The common mode voltage range must be as specified in the Table 1-1: DC Electrical Characteristics. 3. For input trace lengths longer than approximately 1cm, the inputs should be terminated as shown in the Typical Application Circuit. The GS1528 inputs are self-biased, allowing for simple AC coupling to the device. For serial digital video, a minimum capacitor value of 4.7F should be used to allow coupling of pathological test signals. A tantalum capacitor is recommended.
3.2 SD/HD
The GS1528 SDO rise and fall times can be set to comply with both SMPTE 259M/344M and SMPTE 292M. For all SMPTE 259M standards, or any data rate that requires longer rise and fall time characteristics, the SD/HD pin must be set to a HIGH INPUT. For SMPTE 292M standards and signals which require faster rise and fall times, this pin should be set to a LOW INPUT.
3.3 Output Interfacing
The GS1528 outputs are current mode, and will drive 800mV into a 75 load. These outputs are protected from accidental static damage with internal static protection diodes. The SMPTE 292M, SMPTE 344M and SMPTE 259M standards requires that the output of a cable driver have a source impedance of 75 and a return loss of at least 15dB between 5MHz and 1.485GHz. In order for an SDI output circuit using the GS1528 to meet this specification, the output circuit shown in the Typical Application Circuit is recommended. The value of LCOMP will vary depending on the PCB layout, with a typical value of 5.6nH (see the Application Information on page 11 in this data sheet for further details). A 4.7F capacitor is used for AC coupling the output of the GS1528. This value is chosen to ensure that pathological signals can be coupled without a significant DC component occurring.
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GS1528 Data Sheet
Tek Stopped:
8110 Acquisitions
Figure 3-1: Output signal for 270Mb/s input
Tek Running: Normal
Figure 3-2: Output signal for 1.485Gb/s input
When measuring return loss at the GS1528 output, it is necessary to take the measurement for both a logic high and a logic low output condition. This is because the output protection diodes act as a varactor (voltage controlled capacitor) as shown in Figure 3-3. Consequently, the output capacitance of the GS1528 is dependent on the logic state of the output.
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GS1528 Data Sheet
GS1528
SDO
SDO
Figure 3-3: Static Protection Diodes
3.4 Output Return Loss Measurement
To perform a practical return loss measurement, it is necessary to force the GS1528 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 GS1528 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.
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GS1528 Data Sheet
3.5 Output Amplitude Adjustment
The output amplitude of the GS1528 can be adjusted by changing the value of the RSET resistor as shown in Figure 3-4 and Table 3-1: RSET vs VOD. For an 800mVp-p output with a nominal 7% tolerance, a value of 750 is required. A 1% SMT resistor should be used.
1100
OUTPUT SWING (mV)
1000
900
800
700
600 500
600
700
800
900
1000
RSET R ()
Figure 3-4: Output Amplitude Adjustment
The RSET resistor is part of the high speed output circuit of the GS1528. The resistor should be placed as close as possible to the RSET pin. In addition, the PCB capacitance should be minimized at this node by removing the PCB groundplane beneath the RSET resistor and the RSET pin.
Table 3-1: RSET vs VOD RSET R ()
995 824 750 600 573
Output Swing
608 734 800 884 1040
NOTE: For reliable operation of the GS1528 over the full temperature range, do not use an RSET value below 573.
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GS1528 Data Sheet
4. Application Information
4.1 PCB Layout
Special attention must be paid to component layout when designing serial digital interfaces for HDTV. An FR-4 dielectric can be used, however, controlled impedance transmission lines are required for PCB traces longer than approximately 1cm. Note the following PCB artwork features used to optimize performance: The PCB trace width for HD rate signals is closely matched to SMT component width to minimize reflections due to changes in trace impedance. The PCB groundplane is removed under the GS1528 output components to minimize parasitic capacitance. The PCB ground plane is removed under the GS1528 RSET pin and resistor to minimize parasitic capacitance. Input and output BNC connectors are surface mounted in-line to eliminate a transmission line stub caused by a BNC mounting via high speed traces which are curved to minimize impedance variations due to change of PCB trace width.
4.2 Typical Application Cirucit
5.6n 75 4u7 GS1528 49.9 10n DIFFERENTIAL DATA INPUT 49.9 1 2 3 SDI SDI VEE RSET VCC SDO SDO SD/HD 8 7 6 75 10n 75 75 5.6n * 4u7 VCC
*
BNC 4u7
BNC
4u7 VCC
4
5
* TYPICAL VALUE VARIES WITH LAYOUT
VCC 750 10n
SD/HD
NOTE: All resistors in Ohms, capacitors in Farads, and inductors in Henrys, unless otherwise noted.
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GS1528 Data Sheet
5. Package Dimensions
5.00 MAX. 0.49 MAX 1.91 MAX 1.27 MAX
8
5 0.25 4.0 MAX 6.20 MAX MAX
1
4 0.25 MAX = = =
0.60 MAX
3.81 0.05 3 spaces @ 1.27 0.05 8-pin SOIC All dimensions are in millimetres
Figure 5-1: 8 Pin SOIC
5.1 Ordering Information
Part Number
GS1528-CKA GS1528-CTA GS1528-CKAE3 GS1528-CTAE3
Package
8 pin SOIC 8 pin SOIC Tape 8 pin SOIC 8 pin SOIC Tape
Temperature
0C to 70C 0C to 70C 0C to 70C 0C to 70C
Pb-Free and RoHS Compliant
No No Yes Yes
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GS1528 Data Sheet
6. Revision History
Version
4 5
ECR
136566 137163
Date
April 2005 June 2005
Changes and / or Modifications
Updated `Green' references to RoHS Compliant. Rephrased RoHS compliance statement.
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 to the product at any time without notice 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 Shipping Address: 970 Fraser Drive, Burlington, Ontario, Canada L7L 5P5 Tel. +1 (905) 632-2996 Fax. +1 (905) 632-5946
GENNUM JAPAN CORPORATION
Shinjuku Green Tower Building 27F, 6-14-1, Nishi Shinjuku, Shinjuku-ku, Tokyo, 160-0023 Japan Tel. +81 (03) 3349-5501, Fax. +81 (03) 3349-5505
GENNUM UK LIMITED
25 Long Garden Walk, Farnham, Surrey, England GU9 7HX Tel. +44 (0)1252 747 000 Fax +44 (0)1252 726 523 Gennum Corporation assumes no liability for any errors or omissions in this document, or for the use of the circuits or devices described herein. The sale of the circuit or device described herein does not imply any patent license, and Gennum makes no representation that the circuit or device is free from patent infringement. GENNUM and the G logo are registered trademarks of Gennum Corporation. (c) Copyright 2002 Gennum Corporation. All rights reserved. Printed in Canada. www.gennum.com
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