Gennum GS1524-CTDE3 Gs1524 hd-linx-tm ii multi-rate sdi adaptive cable equalizer Datasheet

GS1524 HD-LINX™ II
Multi-Rate SDI Adaptive
Cable Equalizer
GS1524 Data Sheet
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
Key Specifications
•
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
Applications
•
SMPTE 292M, SMPTE 344M and SMPTE 259M
Coaxial Cable Serial Digital Interfaces
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.
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
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GS1524 Data Sheet
Contents
Key Features .................................................................................................................1
Key Specifications .........................................................................................................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 ......................................................................................................................6
2.1 Pin Connections ..............................................................................................6
2.2 Pin Descriptions ..............................................................................................6
3. Input/Output Circuits .................................................................................................8
4. Typical Performance Curves ...................................................................................10
5. Detailed Description ................................................................................................14
6. Cable Length Indication/Carrier Detect/Mute ..........................................................15
7. Application Information............................................................................................16
7.1 PCB Layout ...................................................................................................16
7.2 Typical Application Circuit .............................................................................16
8. Package dimensions ...............................................................................................17
8.1 Ordering Information .....................................................................................17
9. Revision History ......................................................................................................18
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GS1524 Data Sheet
1. Electrical Characteristics
1.1 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
1.2 DC Electrical Characteristics
Table 1-1: DC Electrical Characteristics
VDD = 3.3V, TA = 0°C to 70°C, unless otherwise shown
Parameter
Conditions
Symbol
Min
Typ
Max
Units
Notes
Test
Levels
Supply Voltage
–
VCC
3.135
3.3
3.465
V
± 5%
1
Power Consumption
TA=25°C
PD
–
265
–
mW
–
5
Supply Current
TA=25°C
ΙS
–
80
–
mA
–
1
Output Common Mode
Voltage
TA=25°C
VCMOUT
–
VCC - ΔVSDO/2
–
V
–
7
Input Common Mode
Voltage
TA=25°C
VCMIN
–
1.75
–
V
–
10
CLI DC Voltage (0m)
TA=25°C
–
–
2.5
–
V
–
1
CLI DC Voltage (no signal)
TA=25°C
–
–
1.9
–
V
–
7
Floating MCLADJ DC
Voltage
TA=25°C
–
–
1.3
–
V
–
7
MCLADJ Range
TA=25°C
–
–
0.69
–
V
–
7
CD/Mute Output Voltage
Carrier not
present
VCD/Mute(OH)
2.6
–
–
V
–
1
Carrier present
VCD/Mute(OL)
–
–
1.2
–
1
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GS1524 Data Sheet
Table 1-1: DC Electrical Characteristics
VDD = 3.3V, TA = 0°C to 70°C, unless otherwise shown
Parameter
Conditions
Symbol
Min
Typ
Max
Units
Notes
Test
Levels
CD/Mute Input Voltage
Required to Force Outputs
to Mute
Min to Mute
VCD/Mute
3.0
–
–
V
–
7
CD/Mute Input Voltage
Required to Force Active
Max to Activate
VCD/Mute
–
–
2.0
V
–
7
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.
10.Wafer Probe
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
–
–
143
–
1485
Mb/s
–
6
Input Voltage Swing
TA =25°C, differential
ΔVSDI
720
800
950
mVp-p
0m cable
length
1
Output Voltage Swing
50Ω load, TA =25°C,
ΔVSDO
–
750
–
mVp-p
–
1
270Mb/s, Belden 1694A,
0.2UI output jitter
–
–
350
–
m
Equalizer
Pathological
7
270Mb/s, Belden 8281
–
–
280
–
m
Equalizer
Pathological
1
–
–
140
–
m
Equalizer
Pathological
7
–
–
100
–
m
Equalizer
Pathological
1
–
–
80
220
ps
–
1
–
–
–
30
ps
–
1
differential
Maximum equalized
cable length
0.2UI output jitter
1.485Gb/s, Belden 1694A
0.25UI output jitter
1.485Gb/s, Belden 8281
0.25UI output jitter
Output Rise/Fall time
20% - 80%
Mismatch in rise/fall time
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GS1524 Data Sheet
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
Duty cycle distortion
–
–
–
–
30
ps
–
1
Overshoot
–
–
–
–
10
%
–
1
Input Return Loss
–
–
15
–
–
dB
1
7
Input Resistance
single ended
–
–
1.64
–
kΩ
–
6
Input Capacitance
single ended
–
–
1
–
pF
–
6
Output Resistance
single ended
–
–
50
–
Ω
–
6
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. 1. Tested on CB1524 board from 5MHz to 2GHz.
GigaBERT
1400
EXT. CLOCK DATA
CLOCK OUT
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 1-1: Test Circuit
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GS1524 Data Sheet
2. Pin Out
2.1 Pin Connections
CLI
1
16
CD/MUTE
VCC
2
15
V
VEE
3
14
VEE
SDI
4
13
SDO
SDI
5
12
SDO
V
EE
6
11
V
AGC+
7
10
MCLADJ
AGC-
8
9
BYPASS
CC
GS1524
16PIN SOIC
TOP VIEW
EE
Figure 2-1: 16 PIN SOIC
2.2 Pin Descriptions
Table 2-1: 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
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Equalized serial digital differential output.
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GS1524 Data Sheet
Table 2-1: Pin Descriptions
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.
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GS1524 Data Sheet
3. Input/Output Circuits
All resistors in ohms, all capacitors in farads, unless otherwise shown.
3k
3k
SDI
SDI
RC
3.6k
3.6k
Figure 3-1: Input Equivalent Circuit
VCC
12k
+
MCLADJ
-
150µ
Figure 3-2: MCLADJ Equivalent Circuit
50
SDO
50
SDO
Figure 3-3: Output Circuit
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GS1524 Data Sheet
VCC
10k
10k
-
CLI
+
Figure 3-4: CLI Output Circuit
VCC
7.5k
OUTPUT
STAGE
CD/MUTE
MUTE
CONTROL
Figure 3-5: CD/Mute Circuit
Internal
Reference
Bypass
Figure 3-6: Bypass Circuit
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GS1524 Data Sheet
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
OUTPUT SIGNAL SWING (mV)
500
400
300
200
100
0
0
20
40
60
80
TEMPERATURE (˚C)
Figure 4-3: Output Signal Swing, p-p, Single Ended
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GS1524 Data Sheet
1100
900
JITTER (ps)
700
500
400
300
200
100
0
0
100
200
300
400
CABLE LENGTH (m)
Figure 4-4: Typical Peak to Peak Jitter, PRN 223-1, Belden 1694A, 270Mb/s
VOLTAGE (V)
3.5
3.0
2.5
2.0
0
50
150
100
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
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GS1524 Data Sheet
Tek Running: Normal
Figure 4-7: Input 100m (Belden 8281), 1.485Gb/s
Figure 4-8: Input 280m (Belden 8281), 270Mb/s
0
-10
-20
-30
-40
-50
0.05 GHz
1 GHz
2 GHz
Figure 4-9: Input Return Loss using CB1524 Board
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GS1524 Data Sheet
Figure 4-10: Fig. 17
Output 100m (Belden 8281), 1.485Gb/s
Figure 4-11: Output 280m (Belden 8281), 270Mb/s
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GS1524 Data Sheet
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.
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. 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
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GS1524 Data Sheet
6. Cable Length Indication/Carrier Detect/Mute
For SMPTE 259M inputs the GS1524 incorporates an analog cable length indicator
(CLI) output and a programmable threshold output mute (MCLADJ). In addition, a
multi-function CD/MUTE pin allows control of the GS1524 MUTE functionality for
both SD and HD inputs.
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.
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 1-1: 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 1-1: 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.
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GS1524 Data Sheet
7. Application Information
7.1 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:
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.
7.2 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.
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GS1524 Data Sheet
8. 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
b
0.33
0.41
0.51
0.013
0.016
0.020
0.25
0.007
c
0.19
0.010
D
9.80
9.91
10.01
0.386
0.390
0.394
E
3.80
3.90
4.00
0.150
0.154
0.157
e
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
8˚
0˚
0.004
0˚
8˚
Figure 8-1: 16 PIN SOIC
8.1 Ordering Information
Part Number
Package
Temperature
Pb-Free and RoHS Compliant
GS1524-CKD
16 pin SOIC
0°C to 70°C
No
GS1524-CTD
16 pin SOIC Tape
0°C to 70°C
No
GS1524-CKDE3
16 pin SOIC
0°C to 70°C
Yes
GS1524-CTDE3
16 pin SOIC Tape
0°C to 70°C
Yes
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GS1524 Data Sheet
9. Revision History
Version
ECR
Date
Changes and / or Modifications
6
136565
April 2005
Updated ‘Green’ references to RoHS Compliant.
7
137165
June 2005
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.
© Copyright 2001 Gennum Corporation. All rights reserved. Printed in Canada.
www.gennum.com
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