GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate Cable Driver
1 of 13GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate
Cable Driver
Data Sheet
16632 - 9 August 2010
www.gennum.com
Features
• SMPTE 292M, SMPTE 344M and SMPTE 259M
compliant
• dual coaxial cable driving outputs with selectable
slew rate
•50Ω differential PECL input
• seamless interface to other HD-LINX® II family
products
• Pb-free and RoHS Compliant
• single 3.3V power supply operation
• operating temperature range: 0°C to 70°C
Applications
• SMPTE 292M, SMPTE 344M and SMPTE 259M Coaxial
Cable Serial Digital Interfaces.
Description
The GS1528 is a second generation high-speed bipolar
integrated circuit designed to drive one or two 75Ω
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.
P
ower consumption is typically 160mW using a 3.3V power
supply.
This component and all homogeneous subcomponents are
RoHS compliant.
Functional Block Diagram
SDO
RSET
SDO
SDI
SDI
SD/HD
Bandgap Reference and Biasing Circuit
Output Stage &
Control
Input
Differential
Pair
GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate
Cable Driver
Data Sheet
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Revision History
Contents
1.1 Absolute Maximum Ratings ..........................................................................................................3
1.2 DC Electrical Characteristics ........................................................................................................3
1.3 AC Electrical Characteristics ........................................................................................................4
2.1 Pin Assignment ..................................................................................................................................5
2.2 Pin Descriptions ................................................................................................................................5
2.3 Input/Output Circuits .....................................................................................................................6
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
4.1 PCB Layout ....................................................................................................................................... 11
4.2 Typical Application Circuit ........................................................................................................ 11
5.1 Ordering Information ................................................................................................................... 12
Version ECR PCN Date Changes and / or Modifications
9 154748 – August
2010
Corrected Figure 5-1: Package Dimensions.
8 152046 – June 2009 Removed ‘Proprietary & Confidential’ from footer.
7 151340 – February
2009
Updated document format. Added 2,500pc reel, and removed leaded parts in
section 5.1 Ordering Information.
6 139116 38124 January
2006
Corrected Serial Input Swing to 2200mV
5 137163 – June 2005 Rephrased RoHS compliance statement.
4 136566 – April 2005 Updated ‘Green’ references to RoHS Compliant.
GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate
Cable Driver
Data Sheet
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1. Electrical Characteristics
1.1 Absolute Maximum Ratings
TA = 25°C unless otherwise indicated
1.2 DC Electrical Characteristics
Parameter Value
Supply Voltage -0.5V to 3.6 VDC
Input ESD Voltage 500V
Storage Temperature Range -50°C < Ts < 125°C
Input Voltage Range (any input) -0.3 to (VCC +0.3)V
Operating Temperature Range0°C to 70°C
Power Dissipation 300mW
Lead Temperature (soldering, 10 sec) 260°C
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
Table 1-1: DC Electrical Characteristics
VDD = 3.3V, TA = 0°C to 70°C, unless otherwise shown
Parameter Conditions Symbol Min Ty p Max Units Notes Test
Levels
Supply VoltageV
CC 3.135 3.3 3.465 V ±5% 3
Power
Consumption
TA = 25°CPD– 160 – mW 5
Supply Current TA = 25°CΙs–48–mA 1
Output VoltageCommon
mode
VCMOUT –V
CC - VOUT –– 6
Input VoltageCommon
mode
VCMIN 1.6 + ΔVSDI/2 – VCC - ΔVSDI/2 V 5
SD/HD Input VIH 2.4 – – V 7
VIL ––0.8V 7
GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate
Cable Driver
Data Sheet
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1.3 AC Electrical Characteristics
Table 1-2: AC Electrical Characteristics
VDD = 3.3V, TA = 0°C to 70°C, unless otherwise shown
Parameter Conditions Symbol Min Typ Max Units Notes Test Levels
Serial input data rate DRSDO – – 1.485 Gb/s 2 1
Additive jitter 1.485Gb/s – 15 – psp-p 1
270Mb/s – 25 – psp-p 1
Rise/Fall time SD/HD=0 tr, tf– – 220 ps 20% to 80% 1
SD/HD=1 tr, tf400 – 800 ps 20% to 80% 1
Mismatch in rise/fall
time
Utr, Utf––30 ps 1
Duty cycle distortion – – 30 ps 1
Overshoot – – 8 % 1
Output Return Loss ORL 15 – – dB1 7
Output Voltage SwingSingle Ended
into 75Ω
external load
RSET = 750Ω
VOUT 750 800 850 mVp-p 1
Input Voltage SwingDifferential UVSDI 300 – 2200 mVp-p 1
TEST LEVELS
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.
GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate
Cable Driver
Data Sheet
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2. Pin Out
2.1 Pin Assignment
Figure 2-1: 8-Pin SOIC
2.2 Pin Descriptions
SDI
SDI
V
EE
R
SET
SDO
SDO
SD/HD
V
CC
1
2
3
4
8
7
6
5
GS1528
8-pin SOIC
(top view)
Table 2-1: Pin Descriptions
Pin Number Name Type Description
1,2 SDI, SDI PECL INPUT Serial digital differential input.
3V
EE POWER Most negative power supply connection. Connect to GND.
4R
SET INPUT External output amplitude control resistor.
5V
CC POWER Most positive power supply connection. Connect to +3.3V.
6SD/HD LOGIC INPUT 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.
7, 8 SDO, SDO OUTPUT Serial digital differential output.
GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate
Cable Driver
Data Sheet
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2.3 Input/Output Circuits
Figure 2-2: Differential Input Stage (SDI/SDI)
Figure 2-3: Differential Output Stage (SDO/SDO)
ΙREF derived using RSET
Figure 2-4: Slew Rate Select Input Stage (SD/HD)
VCC
VCC
SDI SDI
10k 10k
5k
10k
V
cc
REF
SDO SDO
SD/HD
V
CC
On Chip
Reference
GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate
Cable Driver
Data Sheet
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3. Detailed Description
3.1 Input Interfacing
S
DI/SDI are high-impedance differential inpu
ts (see Figure 2-1 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 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 4.7μF 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 75Ω 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 75Ω 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 L
COMP
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
4.7μF 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.
GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate
Cable Driver
Data Sheet
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Figure 3-1: Output signal for 270Mb/s input
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 varactors (voltage controlled capacitors) as shown in
Figure 3-3.
Consequently, the output capacitance of the GS1528 is dependent on the logic state of
the output.
Tek Stopped: 8110 Acquisitions
Tek Running: Normal
GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate
Cable Driver
Data Sheet
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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.
SDO
SDO
GS1528
GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate
Cable Driver
Data Sheet
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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. For an 800mVp-p output with a nominal
±7% tolerance, a value of 750Ω is required. A ±1% SMT resistor should be used.
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 ground plane beneath the RSET
resistor and the RSET pin.
NOTE: For reliable operation of the GS1528 over the full temperature range, do not use
an RSET value below 573Ω.
Table 3-1: RSET vs. VOD
RSET Resistance (Ω)Output Swing
995 608
824 734
750 800
600 884
573 1040
1100
1000
900
800
700
700 800 900 1000
R
SET
R (W)
Output Swing (mV)
600
600500
GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate
Cable Driver
Data Sheet
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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
transmission line stubs 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 Circuit
Figure 4-1: GS1528 Typical Application Circuit
SD/HD
GS1528
1
2
3
4
8
7
6
5
SDI
SDI
VEE
RSET
SDO
SDO
SD/HD
VCC
10n
75
5.6n
4u7
BNC
VCC
75
5.6n
10n 75
4u7
49.9
750 10n
49.9
4u7
75
BNC
VCC
4u7
VCC * TYPICAL VALUE VARIES WITH LAYOUT
DIFFERENTIAL
DATA INPUT
*
*
NOTE: All resistors in Ohms, capacitors in Farads,
and inductors in Henrys, unless otherwise noted.
GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate
Cable Driver
Data Sheet
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5. Package Dimensions
Figure 5-1: Package Dimensions
5.1 Ordering Information
Part Number Package Temperature Pb-Free and RoHS Compliant
GS1528-CKAE3 8 pin SOIC0°C to 70°CYes
GS1528-CTAE3 8 pin SOIC, tape & reel
(250pc)
0°C to 70°CYes
GS1528-CTAE3Z 8 pin SOIC, tape & reel
(2,500pc)
0°C to 70°CYes
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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.
GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate
Cable Driver
Data Sheet
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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.
All other trademarks mentioned are the properties of their respective owners.
GENNUM and the Gennum logo are registered trademarks of Gennum Corporation.
© Copyright 2002 Gennum Corporation. All rights reserved.
www.gennum.com
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CAUTION
ELECTROSTATIC SENSITIVE DEVICES
DO NOT OPEN PACKAGES OR HANDLE EXCEPT AT A
STATIC-FREE WORKSTATION