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GS1528A/GS9068A HD-LINX® II Multi-Rate Dual
Slew-Rate Cable Driver
Data Sheet
30953 - 7 July 2012
HD-LINX® II Multi-Rate Dual Slew-Rate Cable Driver
GS1528A
and
GS9068A
www.semtech.com
Features
GS1528A
SMPTE 292M, SMPTE 344M and SMPTE 259M
compliant
Dual coaxial cable driving outputs with selectable
slew rate
•50Ω differential PECL input
Pb-free and RoHS compliant
Pin compatible with GS9068A HD-LINX II SD SDI cable
driver
Seamless interface to other HD-LINX II family products
Single 3.3V power supply operation
Operating temperature range: 0°C to 70°C
GS9068A
SMPTE 259M and SMPTE 344M compliant
Dual coaxial cable driving outputs
50W differential PECL input
Pb-free and RoHS compliant
Pin compatible with GS1528A HD-LINX II multi-rate
SDI dual slew-rate cable driver
Seamless interface to other HD-LINX II family products
Single 3.3V power supply operation
Operating temperature range: 0°C to 70°C
Applications
GS1528A
SMPTE 292M, SMPTE 344M and SMPTE 259M Coaxial
Cable Serial Digital Interfaces
GS9068A
SMPTE 259M and SMPTE 344M Coaxial Cable Serial
Digital Interfaces
Description
The GS1528A/9068A is a second generation, high speed
BiCMOS integrated circuit designed to drive one or two
75W coaxial cables.
The GS1528A may drive data rates up to 1.485Gb/s and
provides two selectable slew rates in order to achieve
compliance to SMPTE 259M, SMPTE 344M and SMPTE
292M.
The GS9068A may drive data rates up to 540Mb/s and will
achieve compliance to SMPTE 259M and SMPTE 344M.
The GS1528A/9068A accepts a LVPECL level differential
input that may be AC coupled. External biasing resistors at
the inputs are not required. Power consumption is typically
168mW using a 3.3V power supply. The GS1528A/9068A is
Pb-free, and the encapsulation compound does not contain
halogenated flame retardant. This component and all
homogeneous sub components are RoHS compliant.
Figure A: GS1528A (left) and GS9068A (right) Functional Block Diagrams
SDO
R
SET
SDO
SDI
SDI
SD/HD
Bandgap Reference & Biasing Circuit
Output Stage &
Control
Input
Differential
Pair
GS1528A
SDO
R
SET
SDO
SDI
SDI
Bandgap Reference & Biasing Circuit
Output Stage &
Control
Input
Differential
Pair
GS9068A
GS1528A/GS9068A HD-LINX® II Multi-Rate Dual
Slew-Rate Cable Driver
Data Sheet
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Proprietary & Confidential
Revision History
Version ECR PCN Date Changes and/or Modifications
7 158377 July 2012 Correction in GS9068A Pin Assignment
6154747 August 2010 Correction to Package Dimensions and
Ordering Information.
5 153754 November 2009 Updated to latest Gennum template.
4 139112 38124 January 2006Corrected Input Differential Swing to
2200mV.
3 137886September 2005 Corrected process to BiCMOS.
2 137403 July 2005 Updated to current document
template to remove “Proprietary and
Confidential” footer. Re-ordered
solder reflow profiles to show
preference for Pb-free profile.
Clarified naming of standard Pb solder
reflow profile. Added packaging data
section. Updated document to reflect
the RoHS compliance of both the
GS1528A and GS9068A.
1 133654 June 2004 Modified Table 2-3. Added reflow
profiles. Upgraded from a preliminary
data sheet to a data sheet.
0 132954 February 2004 New document.
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Slew-Rate Cable Driver
Data Sheet
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Contents
Features................................................................................................................................................................. 1
Applications.........................................................................................................................................................1
Description...........................................................................................................................................................1
Revision History .................................................................................................................................................2
1. Pin Out...............................................................................................................................................................4
1.1 GS1528A Pin Assignment ..............................................................................................................4
1.2 GS9068A Pin Assignment ..............................................................................................................4
1.3 GS1528A/GS9068A Pin Descriptions ........................................................................................4
2. Electrical Characteristics ............................................................................................................................5
2.1 Absolute Maximum Ratings ..........................................................................................................5
2.2 DC Electrical Characteristics ........................................................................................................5
2.3 AC Electrical Characteristics ........................................................................................................6
3. Solder Reflow Profile....................................................................................................................................8
4. Input / Output Circuits ................................................................................................................................9
5. Detailed Description.................................................................................................................................. 10
5.1 Input Interfacing ............................................................................................................................ 10
5.2 Output Interfacing ........................................................................................................................ 10
5.3 Output Return Loss Measurement ........................................................................................... 12
5.4 Output Amplitude Adjustment ................................................................................................. 12
6. Application Information .......................................................................................................................... 14
6.1 PCB Layout ....................................................................................................................................... 14
6.2 Typical Application Circuits ...................................................................................................... 14
7. Package & Ordering Information .......................................................................................................... 16
7.1 Package Dimensions ..................................................................................................................... 16
7.2 Packaging Data ............................................................................................................................... 16
7.3 Ordering Information ................................................................................................................... 17
GS1528A/GS9068A HD-LINX® II Multi-Rate Dual
Slew-Rate Cable Driver
Data Sheet
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1. Pin Out
1.1 GS1528A Pin Assignment
Figure 1-1: 8 Pin SOIC
1.2 GS9068A Pin Assignment
Figure 1-2: 8 Pin SOIC
1.3 GS1528A/GS9068A Pin Descriptions
SDI
SDI
V
EE
R
SET
SDO
SDO
SD/HD
V
CC
1
2
3
4
8
7
6
5
GS1528A
8-pin SOIC
(top view)
SDI
SDI
V
EE
R
SET
SDO
SDO
NC
V
CC
1
2
3
4
8
7
6
5
GS9068A
8-pin SOIC
(top view)
Table 1-1: Pin Descriptions
Pin Number Name Timing Typ e Description
1,2 SDI, SDI AnalogInput Serial digital differential input.
3V
EE –PowerMost negative power supply connection. Connect to GND.
4R
SET AnalogInput External output amplitude control resistor.
5V
CC Power Most positive power supply connection. Connect to +3.3V.
6SD/HD Non
Synchronous
Input GS1528A:
Output slew rate control. When set HIGH, the output will meet
SMPTE 259M rise/fall time specifications. When set LOW, the serial
outputs will meet SMPTE 292M rise/fall time specifications.
NC––GS9068A:
No connect. Not connected internally.
7, 8 SDO, SDO AnalogOutput Serial digital differential output.
GS1528A/GS9068A HD-LINX® II Multi-Rate Dual
Slew-Rate Cable Driver
Data Sheet
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2. Electrical Characteristics
2.1 Absolute Maximum Ratings
Table 2-1 lists the absolute maximum ratings for the GS1528A/GS9068A. Conditions
exceeding the limits listed may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or any other conditions above
those listed in the operational sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
2.2 DC Electrical Characteristics
Table 2-2 shows the DC electrical characteristics of the GS1528A and the GS9068A
where conditions are VDD = 3.3V, TA = 0°C to 70°C, unless otherwise specified.
Table 2-1: Absolute Maximum Ratings
Parameter Value
Supply Voltage -0.5V to 3.6 VDC
Input ESD Voltage 2kV
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
Solder Reflow Temperature 26C
Power Dissipation 300mW
Table 2-2: DC Electrical Characteristics
Parameter Symbol Conditions Min Ty p Max Units Notes Test
Levels
Supply VoltageV
CC 3.135 3.3 3.465V±5%3
Power Consumption PDTA = 25°C–168–mW5
Supply Current IsTA = 25°C–5164mA 1
Output VoltageV
CMOUT Common mode–V
CC - VOUT –V6
Input VoltageV
CMIN Common mode1.6 +
ΔVSDI/2
–V
CC -
ΔVSDI/2
V–6
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Slew-Rate Cable Driver
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2.3 AC Electrical Characteristics
Table 2-3 shows the AC electrical characteristics of the GS1528A and the GS9068A
where conditions are VDD = 3.3V, TA = 0°C to 70°C, unless otherwise specified.
SD/HD Input VIH –2.4V17
VIL ––0.8V17
TEST LEVELS
1. Production test at room temperature and nominal supply voltage with
guard bands for supply and temperature ranges.
2. Production test at room temperature and nominal supply voltage with
guard bands 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. This parameter applies only to the GS1528A.
Table 2-2: DC Electrical Characteristics (Continued)
Parameter Symbol Conditions Min Ty p Max Units Notes Test
Levels
Table 2-3: AC Electrical Characteristics
Parameter Symbol Conditions Min Ty p Max Units Notes Test
Levels
Serial input data
rate
DRSDO GS1528A 1.485 Gb/s 1 1
DRSDO GS9068A 540 Mb/s 1
Additive jitter 1.485Gb/s 22 psp-p 21
270Mb/s 16–ps
p-p –4
GS9068A 16–ps
p-p –1
Rise/Fall time tr, tfSD/HD=0 220 ps 2, 3 1
tr, tfSD/HD=1 400 800 ps 2, 3 1
tr, tfGS9068A 400 800 ps 3 1
Mismatch in rise/fall
time
Utr, Utf––30ps1
Duty cycle distortion SD/HD=0 30 ps 2 1
SD/HD=1 100 ps 2 7
GS9068A 100 ps 1
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Slew-Rate Cable Driver
Data Sheet
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Overshoot SD/HD=0 10 % 2 7
SD/HD=1 8 % 2 1
GS9068A 8 % 1
Output Return Loss ORL 15 dB– 7
Output Voltage
Swing
VOUT Single Ended
into 75Ω
external load
RSET = 750Ω
750 800 850 mVp-p –1
Input Voltage SwingUVSDI Differential 300 2000 mVp-p –7
TEST LEVELS
1. Production test at room temperature and nominal supply voltage with
guard bands for supply and temperature ranges.
2. Production test at room temperature and nominal supply voltage with
guard bands 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. The input coupling capacitor must be set accordingly for
lower data rates.
2. This parameter applies only to the GS1528A.
3. Rise/Fall time measured between 20% and 80%.
Table 2-3: AC Electrical Characteristics (Continued)
Parameter Symbol Conditions Min Ty p Max Units Notes Test
Levels
GS1528A/GS9068A HD-LINX® II Multi-Rate Dual
Slew-Rate Cable Driver
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3. Solder Reflow Profile
The maximum Pb-free reflow profile is shown in Figure 3-1.
Figure 3-1: Maximum Pb-free Solder Reflow Profile
25°C
150°C
200°C
217°C
260°C
250°C
Time
Temperature
8 min. max
60-180 sec. max
60-150 sec.
20-40 sec.
3°C/sec max
6°C/sec max
GS1528A/GS9068A HD-LINX® II Multi-Rate Dual
Slew-Rate Cable Driver
Data Sheet
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4. Input / Output Circuits
Figure 4-1: Differential Input Stage (SDI/SDI)
Figure 4-2: Differential Output Stage (SDO/SDO) IREF derived using RSET
Figure 4-3: Slew Rate Select Input Stage (GS1528A only)
VCC
SDI SDI
10k 10k
5k
10k
VCC
VCC
IREF
SDO SDO
SD/HD
V
CC
On-chip
Reference
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Slew-Rate Cable Driver
Data Sheet
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5. Detailed Description
5.1 Input Interfacing
S
DI/SDI are high impedance differential inputs. The equivalent input circuit is shown in
Figure 4-1
.
Several conditions must be observed when interfacing to these inputs:
The differential input signal amplitude must be between 300 and 2000mVp-p.
The common mode voltage range must be as specified in Table 2.2.
For input trace lengths longer than approximately 1cm, the inputs should be
terminated as shown in the Typical Application Circuit.
The GS1528A/9068A 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.
SD/HD Input Pin (GS1528A only):
The GS1528A 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 HIGH by the application
layer. For SMPTE 292M standards and signals which require faster rise and fall times,
this pin should be set LOW.
5.2 Output Interfacing
The GS1528A/9068A 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 require 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 GS1528A/9068A to meet this specification,
the output application circuit shown in Typical Application Circuits on page 14 is
recommended.
The value of L
COMP
will vary depending on the PCB layout, with a typical value of 5.6nH
.
A 4.7μF capacitor is used for AC-coupling the output of the device. This value is chosen
to ensure that pathological signals can be coupled without a significant DC component
occurring. Please see Application Information on page 14 for more details.
GS1528A/GS9068A HD-LINX® II Multi-Rate Dual
Slew-Rate Cable Driver
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Figure 5-1: Output signal for 270Mb/s input
Figure 5-2: Output signal for 1.485Gb/s input (GS1528A only)
The output protection diodes act as a varactor (voltage controlled capacitor) as shown in
Figure 5-3. Therefore, when measuring return loss at the GS1528A/9068A output, it is
necessary to take the measurement for both a logic high and a logic low output
condition.
Consequently, the output capacitance of the device is dependent on the logic state of the
output.
Tek Running: Normal
GS1528A/GS9068A HD-LINX® II Multi-Rate Dual
Slew-Rate Cable Driver
Data Sheet
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Figure 5-3: Static Protection Diodes
5.3 Output Return Loss Measurement
To perform a practical return loss measurement, it is necessary to force the
GS1528A/9068A 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 device 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.
5.4 Output Amplitude Adjustment
The output amplitude of the GS1528A/9068A can be adjusted by changing the value of
the RSET resistor as shown in Table 5-1. For an 800mVp-p output with a nominal ±7%
tolerance, a value of 750Ω is required. A ±1% SMT resistor should be used.
The RSET resistor is part of the high speed output circuit of the GS1528A/9068A. 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.
SDO
SDO
GS1528A
GS1528A/GS9068A HD-LINX® II Multi-Rate Dual
Slew-Rate Cable Driver
Data Sheet
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Table 5-1: RSET vs VOD
RSET Resistance (Ω)Output Swing (mVp-p)
995 608
824 734
750 800
680 884
573 1040
NOTE: For reliable operation of the GS1528A/9068A over the full temperature range, do not
use an RSET value below 573Ω.
GS1528A/GS9068A HD-LINX® II Multi-Rate Dual
Slew-Rate Cable Driver
Data Sheet
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6. Application Information
6.1 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 GS1528A/9068A output components to
minimize parasitic capacitance
•The PCB ground plane is removed under the GS1528A/9068A 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
6.2 Typical Application Circuits
Figure 6-1: GS1528A Typical Application Circuit
SD/HD
GS1528A
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.
GS1528A/GS9068A HD-LINX® II Multi-Rate Dual
Slew-Rate Cable Driver
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Figure 6-2: GS9068A Typical Application Circuit
GS9068A
1
2
3
4
8
7
6
5
SDI
SDI
VEE
RSET
SDO
SDO
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.
NC
GS1528A/GS9068A HD-LINX® II Multi-Rate Dual
Slew-Rate Cable Driver
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7. Package & Ordering Information
7.1 Package Dimensions
7.2 Packaging Data
0.010
q2 L
DETAIL A
C
0.015 ±0.004 x 45°
DETAIL A
q1
B
AA1
E
X
D
e
Pin 1
ID Mark
Gauge Plane
Seating Plane
NOTES:
1. All dimensions in inches unless otherwise stated.
2. Lead coplanarity should be 0 to 0.004 max.
3. Package surface finishing: VDI 24~27 (dual).
Package surface finishing: VDI 13~15 (16L SOIC[NB] matrix).
4. All dimensions exclude mold flashes.
5. The lead width (B) to be determined at 0.0075
from the lead tip.
8 SOIC
Min. Max.
SYMBOL
A
A1
B
D
E
H
e
C
L
X
q2
q1
0.054 0.068
0.004 0.0098
0.014 0.019
0.189 0.196
0.157
0.244
0.229
0.150
0.050 BSC
0.0075 0.0098
0.016 0.034
0.0215 REF
7° BSC
Table 7-1: Packaging Data
Parameter Value
Package Type 8-pin SOIC
Moisture Sensitivity Level 2
Junction to Case Thermal Resistance, θj-c72°C/W
Junction to Air Thermal Resistance, θj-a (at zero airflow) 116°C/W
Pb-free and RoHS Compliant Yes
GS1528A/GS9068A HD-LINX® II Multi-Rate Dual
Slew-Rate Cable Driver
Data Sheet
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7.3 Ordering Information
Table 7-2: Ordering Information
Product Part Number Package Temperature Range
GS1528A GS1528ACKAE3 8-pin SOICC to 70°C
GS1528A GS1528ACTAE3 8-pin SOIC, 250pc
tape and reel
C to 70°C
GS1528A GS1528ACTAE3D 8-pin SOIC, 500pc
tape and reel
C to 70°C
GS9068A GS9068ACKAE3 8-pin SOICC to 70°C
GS9068A GS9068ACTAE3 8-pin SOIC, 250pc
tape and reel
C to 70°C
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DOCUMENT IDENTIFICATION
DATA SHEET
Information relating to this product and the application or design described
herein is believed to be reliable, however such information is provided as a
guide only and Semtech assumes no liability for any errors in this document, or
for the application or design described herein. Semtech reserves the right to
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Slew-Rate Cable Driver
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Contact Information
Semtech Corporation
Gennum Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805) 498-2111, Fax: (805) 498-3804
www.semtech.com
CAUTION
ELECTROSTATIC SENSITIVE DEVICES
DO NOT OPEN PACKAGES OR HANDLE EXCEPT AT A
STATIC-FREE WORKSTATION