GS1524 Multi-Rate SDI Adaptive Cable Equalizer
Key Features
Description
•
SMPTE 292M, SMPTE 344M and SMPTE 259M
compliant
•
automatic cable equalization
•
multi-standard operation from 143Mb/s to 1.485Gb/s
•
supports DVB-ASI at 270Mb/s
The GS1524 is a second-generation high-speed bipolar
integrated circuit designed to equalize and restore signals
received over 75Ω co-axial cable at data rates from 143Mb/s
up to 1.485Gb/s. The GS1524 is designed to support SMPTE
292M, SMPTE 344M and SMPTE 259M, and is optimized for
performance at 270Mb/s and 1.485Gb/s.
•
manual bypass (useful for low data rates with slow
rise/fall times)
•
performance optimized for 270Mb/s and 1.485Gb/s
•
typical maximum equalized length of Belden 1694A
cable: 140m at 1.485Gb/s, 350m at 270Mb/s
•
50Ω differential output (with internal 50Ω pull-ups)
•
Pb-free and RoHS Compliant
•
cable length indicator for SMPTE 259M inputs
•
output mute based on max cable length adjust or
manual override
•
single 3.3V power supply operation
•
operating temperature range: 0°C to +70°C
The GS1524 features DC restoration to compensate for the
DC content of SMPTE pathological test patterns. The
GS1524 also incorporates a Cable Length Indicator (CLI)
that provides an indication of the amount of cable being
equalized for data rates up to 360Mb/s.
A voltage programmable mute threshold (MCLADJ) is
included to allow muting of the GS1524 output when an
approximate selected cable length is reached for SMPTE
259M signals. This feature allows the GS1524 to distinguish
between low amplitude SD-SDI signals and noise at the
input of the device. The CD/MUTE pin provides an
indication of the GS1524 mute status in addition to
functioning as a mute control input. The SD outputs of the
GS1524 may be forced to a mute state by applying a voltage
to the CD/MUTE pin.
Applications
•
SMPTE 292M, SMPTE 344M and SMPTE 259M Coaxial
Cable Serial Digital Interfaces
Power consumption is typically 265mW using a 3.3V
power supply.
This component and all homogeneous subcomponents are
RoHS compliant.
CABLE LENGTH INDICATOR/ADJUSTOR
CARRIER DETECT
MUTE
MCLADJ
CLI
CD/MUTE
BYPASS
SDI
SDI
EQUALIZER
DC RESTORE
OUTPUT
SDO
SDO
AGC
Functional Block Diagram
GS1524 Multi-Rate SDI Adaptive Cable Equalizer
Data Sheet
14976 - 11
August 2011
www.gennum.com
1 of 16
Revision History
Version
ECR
PCN
Date
Changes and / or Modifications
11
156822
–
August 2011
Removed the test level notes from Table 2-1: DC Electrical Characteristics and
Table 2-2: AC Electrical Characteristics.
10
151731
–
April 2009
Reorganized figures in Input/Output Circuits and Typical Performance Curves.
Clarified tape and reel information in Ordering Information.
9
151339
–
March 2009
Updated document format. Added 2,500pc reel, and removed leaded parts to
section 7.2 Ordering Information.
8
142111
40438
September
2006
Modified format for output cable length jitter data in AC Electrical
Characteristics.
7
137165
–
June 2005
Rephrased RoHS compliance statement.
6
136565
–
April 2005
Updated ‘Green’ references to RoHS Compliant.
Contents
Key Features ........................................................................................................................................................1
Applications.........................................................................................................................................................1
Description...........................................................................................................................................................1
Revision History .................................................................................................................................................2
1. Pin Out...............................................................................................................................................................3
1.1 GS1524 Pin Assignment .................................................................................................................3
1.2 GS1524 Pin Descriptions ................................................................................................................3
2. Electrical Characteristics ............................................................................................................................5
2.1 Absolute Maximum Ratings ..........................................................................................................5
2.2 DC Electrical Characteristics ........................................................................................................5
2.3 AC Electrical Characteristics ........................................................................................................6
3. Input/Output Circuits ..................................................................................................................................8
4. Typical Performance Curves .....................................................................................................................9
5. Detailed Description.................................................................................................................................. 13
5.1 Serial Digital Inputs ...................................................................................................................... 13
5.2 Cable Equalization ........................................................................................................................ 13
5.3 Programmable Mute Output & Cable Length Indicator .................................................... 14
5.4 Mute and Carrier Detect .............................................................................................................. 14
6. Application Information .......................................................................................................................... 15
6.1 PCB Layout ....................................................................................................................................... 15
6.2 Typical Application Circuit ........................................................................................................ 15
7. Package & Order Information ................................................................................................................ 16
7.1 Package Dimensions ..................................................................................................................... 16
7.2 Ordering Information ................................................................................................................... 16
GS1524 Multi-Rate SDI Adaptive Cable Equalizer
Data Sheet
14976 - 11
August 2011
2 of 16
1. Pin Out
1.1 GS1524 Pin Assignment
CLI
1
16
CD/MUTE
VCC
2
15
VCC
14
VEE
13
SDO
12
SDO
VEE
3
SDI
4
SDI
5
VEE
6
11
V
AGC+
7
10
MCLADJ
AGC-
8
9
BYPASS
GS1524
16PIN SOIC
TOP VIEW
EE
Figure 1-1: 16-pin SOIC
1.2 GS1524 Pin Descriptions
Table 1-1: Pin Descriptions
Pin Number
Name
Type
Description
1
CLI
ANALOG OUTPUT
CABLE LENGTH INDICATOR. An analog voltage proportional to the
cable length connected to the Serial digital input.
Note: CLI is recommended for data rates up to 360Mb/s only.
4,5
SDI, SDI
INPUT
Serial digital differential input.
7,8
AGC+,
AGC-
PASSIVE INPUT
External AGC capacitor. Should be set to IµF
9
BYPASS
LOGIC INPUT
Forces the Equalizing and DC RESTORE stages into bypass mode when
HIGH. No equalization occurs in this mode.
10
MCLADJ
ANALOG INPUT
MAXIMUM CABLE LENGTH ADJUST. Adjusts the approximate
maximum amount of cable to be equalized (from 0m to the maximum
cable length). The output is muted (latched to the last state) when the
maximum cable length is achieved.
Note: MCLADJ is recommended for data rates up to 360Mb/s
12, 13
SDO, SDO
PECL OUTPUT
GS1524 Multi-Rate SDI Adaptive Cable Equalizer
Data Sheet
14976 - 11
August 2011
Equalized serial digital differential output.
3 of 16
Table 1-1: Pin Descriptions (Continued)
Pin Number
Name
Type
Description
16
CD/MUTE
BIDIRECTIONAL
MUTE INDICATOR-CONTROL/CARRIER DETECT.
OUTPUT: the output voltage drops to below 1.2V when the carrier is
present and the data outputs are active.
INPUT: if the CD/MUTE pin is tied to ground, the data output will never
mute and the MCLADJ setting is overwritten. If the CD/MUTE pin is tied
to VCC, the data outputs will always mute and the MCLADJ setting is
overwritten.
Note: CD/MUTE is not functional in BYPASS mode.
3, 6, 11, 14
VEE
POWER
Most negative power supply connection. Connect to ground.
2, 15
VCC
POWER
Most positive power supply connection. Connect to +3.3V.
GS1524 Multi-Rate SDI Adaptive Cable Equalizer
Data Sheet
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August 2011
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2. Electrical Characteristics
2.1 Absolute Maximum Ratings
Parameter
Value
Supply Voltage
-0.5V to +3.6VDC
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 Range
0°C to 70°C
Power Dissipation
300mW
Lead Temperature (soldering, 10 sec.)
260°C
2.2 DC Electrical Characteristics
Table 2-1: DC Electrical Characteristics
VCC = 3.3V ±5%, TA = 0°C to 70°C, unless otherwise shown
Parameter
Conditions
Symbol
Min
Typ
Max
Units
Notes
Supply Voltage
–
VCC
3.135
3.3
3.465
V
± 5%
Power Consumption
TA=25°C
PD
–
265
–
mW
–
Supply Current
TA=25°C
ΙS
–
80
–
mA
–
Output Common Mode Voltage
TA=25°C
VCMOUT
–
VCC - ΔVSDO/2
–
V
–
Input Common Mode Voltage
TA=25°C
VCMIN
–
1.75
–
V
–
CLI DC Voltage (0m)
TA=25°C
–
–
2.5
–
V
–
CLI DC Voltage (no signal)
TA=25°C
–
–
1.9
–
V
–
Floating MCLADJ DC Voltage
TA=25°C
–
–
1.3
–
V
–
MCLADJ Range
TA=25°C
–
–
0.69
–
V
–
CD/Mute Output Voltage
Carrier not present
VCD/Mute(OH)
2.6
–
–
V
–
Carrier present
VCD/Mute(OL)
–
–
1.2
CD/Mute Input Voltage
Required to Force Outputs to
Mute
Min to Mute
VCD/Mute
3.0
–
–
V
–
CD/Mute Input Voltage
Required to Force Active
Max to Activate
VCD/Mute
–
–
2.0
V
–
GS1524 Multi-Rate SDI Adaptive Cable Equalizer
Data Sheet
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August 2011
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2.3 AC Electrical Characteristics
Table 2-2: AC Electrical Characteristics
VCC = 3.3V ±5%, TA = 0°C to 70°C, unless otherwise shown
Parameter
Conditions
Symbol
Min
Typ
Max
Units
Notes
Serial input data rate
–
–
143
–
1485
Mb/s
–
Input Voltage Swing
TA =25°C, differential
ΔVSDI
720
800
950
mVp-p
0m cable
length
50Ω load, TA =25°C,
ΔVSDO
–
750
–
mVp-p
–
Output Voltage Swing
differential
270Mb/s
Belden 1694A: 0-350m
Belden 8281: 0-280m
–
–
0.2
–
UI
2,4
1.485Gb/s
Belden 1694A: 0-140m
Belden 8281: 0-100m
–
–
0.25
–
UI
2,4
Output Rise/Fall time
20% - 80%
–
–
80
220
ps
–
Mismatch in rise/fall time
–
–
–
–
30
ps
–
Duty cycle distortion
–
–
–
–
30
ps
–
Overshoot
–
–
–
–
10
%
–
Input Return Loss
–
–
15
–
–
dB
1
Input Resistance
single ended
–
–
1.64
–
kΩ
–
Input Capacitance
single ended
–
–
1
–
pF
–
Output Resistance
single ended
–
–
50
–
Ω
–
Output Jitter for Various Cable
Lengths and Data Rates
NOTES:
1. Tested on CB1524 board from 5MHz to 2GHz.
2. All parts production tested. In order to guarantee jitter over the full range of specification (VCC = 3.3V ±5%, TA = 0°C to 70°C, and
720-880mV launch swing from the SDI cable driver) the recommended applications circuit must be used.
3. Based on characterization data using the recommended applications circuit, at VCC = 3.3V, TA = 25°C, and 800mV launch swing from the SDI
cable driver.
4. Equalizer Pathological test signal is used.
GigaBERT
1400
EXT. CLOCK
CLOCK OUT
DATA
OUT
8281 or 1694A CABLE
50/75
IN
GS1524
TEST BOARD
EXT.
CLOCK
1.485GHz/270MHz
OUT
CH. 1
OUT
CH. 2
TDS 820
EXT. TRIGGER
Figure 2-1: Test Circuit
GS1524 Multi-Rate SDI Adaptive Cable Equalizer
Data Sheet
14976 - 11
August 2011
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3. Input/Output Circuits
All resistors in ohms, all capacitors in farads, unless otherwise shown.
VCC
10k
3k
3k
SDI
SDI
10k
RC
3.6k
3.6k
-
CLI
+
Figure 3-1: Input Equivalent Circuit
Figure 3-2: CLI Output Circuit
VCC
VCC
7.5k
12k
OUTPUT
STAGE
+
MCLADJ
MUTE
CONTROL
-
CD/MUTE
150µ
Figure 3-3: MCLADJ Equivalent Circuit
50
Figure 3-4: CD/Mute Circuit
50
SDO
SDO
Figure 3-5: Output Circuit
GS1524 Multi-Rate SDI Adaptive Cable Equalizer
Data Sheet
14976 - 11
August 2011
Bypass
Internal
Reference
Figure 3-6: Bypass Circuit
7 of 16
4. Typical Performance Curves
(unless otherwise shown, VCC = 3.3V, TA = 25°C)
POWER CONSUMPTION (mW)
350
300
250
200
150
100
50
0
0
20
40
60
80
150
200
TEMPERATURE (°C)
Figure 4-1: Power Consumption
160
140
JITTER (ps)
120
100
80
60
40
20
0
0
50
100
CABLE LENGTH (m)
Figure 4-2: Typical Peak to Peak Jitter, PRN 223-1, Belden 1694A, 1.485 Gb/s
1100
900
JITTER (ps)
700
500
400
300
200
100
0
0
100
200
300
400
CABLE LENGTH (m)
GS1524 Multi-Rate SDI Adaptive Cable Equalizer
Data Sheet
14976 - 11
August 2011
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Figure 4-3: Typical Peak to Peak Jitter, PRN 223-1, Belden 1694A, 270Mb/s
OUTPUT SIGNAL SWING (mV)
500
400
300
200
100
0
0
20
40
60
80
TEMPERATURE (°C)
Figure 4-4: Output Signal Swing, p-p, Single Ended
VOLTAGE (V)
3.5
3.0
2.5
2.0
0
50
100
150
200
250
300
CABLE LENGTH (m)
Figure 4-5: MCLADJ Input Voltage vs. 1694A Cable Length, 270Mb/s
CLI VOLTAGE (V)
3.5
3
2.5
2
1.5
0
50
100
150
200
250
300
CABLE LENGTH (m)
Figure 4-6: CLI Voltage vs. Belden 8281 Cable Length, 270Mb/s
GS1524 Multi-Rate SDI Adaptive Cable Equalizer
Data Sheet
14976 - 11
August 2011
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Tek Running: Normal
Figure 4-7: Input 100m (Belden 8281), 1.485Gb/s
Figure 4-8: Output 100m (Belden 8281), 1.485Gb/s
GS1524 Multi-Rate SDI Adaptive Cable Equalizer
Data Sheet
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August 2011
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Figure 4-9: Input 280m (Belden 8281), 270Mb/s
Figure 4-10: Output 280m (Belden 8281), 270Mb/s
0
-10
-20
-30
-40
-50
0.05 GHz
1 GHz
2 GHz
Figure 4-11: Input Return Loss using CB1524 Board
GS1524 Multi-Rate SDI Adaptive Cable Equalizer
Data Sheet
14976 - 11
August 2011
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5. Detailed Description
The GS1524 is a high speed bipolar IC designed to equalize both HD and SD serial digital
signals. The device can typically equalize greater than 140 meters of Belden 1694A cable
at 1.485Gb/s and 350m at 270Mb/s. Powered from a single +3.3V or -3.3V power supply,
the device consumes approximately 265mW of power.
5.1 Serial Digital Inputs
The serial data signal may be connected to the input pins (SDI/SDI) in either a
differential or single ended configuration. AC coupling of the inputs is recommended, as
the SDI and SDI inputs are internally biased at approximately 1.8V.
5.2 Cable Equalization
The input signal passes through a variable gain equalizing stage whose frequency
response closely matches the inverse of the cable loss characteristic. In addition, the
variation of the frequency response with control voltage imitates the variation of the
inverse cable loss characteristic with cable length.
The edge energy of the equalized signal is monitored by a detector circuit which
produces an error signal corresponding to the difference between the desired edge
energy and the actual edge energy. This error signal is integrated by both an internal and
an external AGC filter capacitor providing a steady control voltage for the gain stage. As
the frequency response of the gain stage is automatically varied by the application of
negative feedback, the edge energy of the equalized signal is kept at a constant level
which is representative of the original edge energy at the transmitter. The equalized
signal is also DC restored, effectively restoring the logic threshold of the equalized signal
to its correct level independent of shifts due to AC coupling. The digital output signals
have a nominal voltage of 750mVpp differential, or 375mVpp single ended when
terminated with 50Ω as shown in Figure 5-1.
+187.5mV
VCM = 2.925V
typical
SDO
-187.5mV
SDO
+187.5mV
50
50
VCM = 2.925V
typical
-187.5mV
Figure 5-1: Typical Output Voltage Levels
GS1524 Multi-Rate SDI Adaptive Cable Equalizer
Data Sheet
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August 2011
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5.3 Programmable Mute Output & Cable Length Indicator
For SMPTE 259M inputs, the GS1524 incorporates an analog cable length indicator (CLI)
output and a programmable threshold output mute (MCLADJ).
The voltage output of CLI pin is an approximation of the amount of cable present at the
GS1524 input for data rates up to 360Mb/s. The CLI voltage versus cable length (signal
strength) is shown in Figure 4-6. With 0m of cable, 800mV input signal levels and at
270Mb/s, the CLI output voltage is approximately 2.5V. As the cable length increases,
the CLI voltage decreases providing an approximate correlation between the CLI
voltage and cable length.
In applications where there are multiple input channels using the GS1524, it is
advantageous to have a programmable mute output to avoid signal crosstalk.
The output of the GS1524 can be muted when the input signal decreases below a
selectable input level. The voltage applied to the MCLADJ pin vs. input cable length is
shown in Figure 4-5. For consistent accurate results this may need to be calibrated for
each device. The MCLADJ pin may be left unconnected for applications where output
muting is not required. This feature has been designed for use in applications such as
routers where signal crosstalk and circuit noise cause the equalizer to output erroneous
data when no input signal is present. The use of a Carrier Detect function with a fixed
internal reference does not solve this problem since the signal to noise ratio on the
circuit board could be significantly less than the default signal detection level set by the
on chip reference.
NOTE: MCLADJ and CLI are only recommended for data rates up to 360Mb/s.
5.4 Mute and Carrier Detect
In addition, a multi-function CD/MUTE pin allows control of the GS1524 MUTE
functionality for both SD and HD inputs.
The CD/MUTE pin is a multi-function bidirectional pin that provides the following
functions:
Applying a HIGH INPUT to the CD/MUTE pin forces the GS1524 outputs to a muted
condition. See the Table 2-1: DC Electrical Characteristics for voltage levels. In this
condition the outputs will be latched to the last logic level present at the output to avoid
signal crosstalk.
Applying a LOW INPUT to the CD/MUTE pin will force the GS1524 outputs to remain
active regardless of the length of input cable and the voltage applied to the MCLADJ pin.
See the Table 2-1: DC Electrical Characteristics for voltage levels.
When used as an OUTPUT, the CD/MUTE pin will provide an indication of the output
mute status. The CD/MUTE voltage will fall to below 1.2V when the carrier is present
and the data outputs are active.
Note: The CD/MUTE pin is not functional in BYPASS mode.
GS1524 Multi-Rate SDI Adaptive Cable Equalizer
Data Sheet
14976 - 11
August 2011
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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. A 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:
PCB trace width for HD rate signals is closely matched to SMT component width to
minimize reflections due to change in trace impedance.
The PCB ground plane is removed under the GS1524 input components to minimize
parasitic capacitance.
The PCB ground plane is removed under the GS1524 output components to minimize
parasitic capacitance.
High-speed traces are curved to minimize impedance changes.
6.2 Typical Application Circuit
CLI
CD/MUTE
VCC
VCC
10n
BNC
GS1524
6.4n
1
2
3
1u
4
5
6
7
75
1u
8
75
+
37.4
CLI
VCC
VEE
SDI
SDI
VEE
AGC+
AGC-
10n
CD/MUTE
VCC
VEE
SDO
SDO
VEE
MCLADJ
BYPASS
16
15
14
13
12
11
10
9
+
4u7
SDO
+
SDO
4u7
1u
MCLADJ
NOTE: All resistors in Ohms, capacitors in Farads,
and inductors in Henrys, unless otherwise noted.
BYPASS
Figure 6-1: GS1524 Typical Application Circuit
GS1524 Multi-Rate SDI Adaptive Cable Equalizer
Data Sheet
14976 - 11
August 2011
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7. Package & Order Information
7.1 Package Dimensions
* CONTROLLING DIMENSION: MM
MILLIMETER
INCH
Symbol
MIN.
NOM.
MAX.
MIN.
NOM.
MAX.
A
1.35
1.63
1.75
0.053
0.064
0.069
A1
0.10
0.15
0.25
0.004
0.006
0.010
A2
1.30
1.40
1.50
0.051
0.055
0.059
0.33
0.41
0.51
0.013
0.016
0.020
b
c
0.25
0.19
D
9.80
9.91
E
3.80
3.90
e
0.010
0.007
10.01
0.386
0.390
0.394
4.00
0.150
0.154
0.157
1.27
0.50
H
5.80
6.00
6.20
0.228
0.236
0.244
L
0.40
0.64
1.27
0.016
0.025
0.050
L1
0.042
1.07
0.10
Y
0°
8°
0.004
0°
8°
Figure 7-1: 16-pin SOIC
7.2 Ordering Information
Part Number
Package
Temperature
Pb-Free and RoHS Compliant
GS1524-CKDE3
16 pin SOIC
0°C to 70°C
Yes
GS1524-CTDE3
16 pin SOIC Tape (250pcs)
0°C to 70°C
Yes
GS1524-CTDE3Z
16 pin SOIC Tape (2,500pcs)
0°C to 70°C
Yes
GS1524 Multi-Rate SDI Adaptive Cable Equalizer
Data Sheet
14976 - 11
August 2011
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DOCUMENT IDENTIFICATION
CAUTION
DATA SHEET
ELECTROSTATIC SENSITIVE DEVICES
The product is in production. Gennum reserves the right to make changes at
any time to improve reliability, function or design, in order to provide the best
product possible.
DO NOT OPEN PACKAGES OR HANDLE EXCEPT AT A
STATIC-FREE WORKSTATION
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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 2001 Gennum Corporation. All rights reserved.
www.gennum.com
GS1524 Multi-Rate SDI Adaptive Cable Equalizer
Data Sheet
14976 - 11
August 2011
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