+'/,1;
™
GS1504
HDTV Adaptive Equalizer
DATA SHEET
FEATURES
• SMPTE 292M compliant
• Automatic, adjustment free cable equalization for
1.485Gb/s HDTV signals
• Differential serial outputs capable of driving 50Ω loads
• Typically equalizes 100m of Belden 8281 or 150m of
Belden 1694 high quality co-axial cable
• Cable Length Indication
• Output Mute
• Maximum Cable Length Adjust
• Low power
• Minimal external components
• Single +5V or -5V power supply operation
APPLICATIONS
1.485Gb/s HDTV Serial Digital Receiver Interfaces for
Routers, Distribution Amplifiers, Switchers, and other
receiving equipment.
DESCRIPTION
The GS1504 is a high performance cable equalizer
designed to equalize HDTV component signal conforming
to SMPTE 292M. The adaptive cable equalizer is capable of
equalizing up to 100m of Belden 8281 co-axial cable.
The GS1504 features DC restoration for immunity to the DC
content in pathological test patterns. The device also
incorporates a Cable Length Indicator signal that provides
an indication of the amount of cable being equalized.
A voltage programmable mute threshold (MCLADJ) is
included to allow muting of the GS1504 output when a
selected cable length is reached. This feature allows the
GS1504 to distinguish between low amplitude HD SDI
signals and noise at the input of the device. The CD/Mute
pin provides an indication of the GS1504 mute status in
addition to functioning as a mute control input. The output
of the GS1504 may be forced to an active or a mute
condition by applying a voltage to the CD/Mute pin.
The GS1504 is a low power device that operates from a
single 5V power supply. The GS1504 is packaged in a
16 pin narrow SOIC and does not need external pull-up
resistors.
ORDERING INFORMATION
PART NUMBER
PACKAGE
TEMPERATURE
GS1504
GS1504-CKD
GS1504-CTD
16 pin narrow SOIC
16 pin Tape and Reel
0°C to 70°C
0°C to 70°C
MCLADJ
CABLE LENGTH INDICATOR/ADJUSTOR
CARRIER DETECT
MUTE
CLI
CD/MUTE
SDI
SDI
EQUALIZER
DC
RESTORE
SDO
OUTPUT
SDO
AGC
PATENT PENDING
BLOCK DIAGRAM
Revision Date: July 2001
GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3
Tel. +1 (905) 632-2996 Fax. +1 (905) 632-5946 E-mail: info@gennum.com
www.gennum.com
Document No. 522 - 05 - 04
ABSOLUTE MAXIMUM RATINGS
T
A
= 25°C unless otherwise indicated
PARAMETER
VALUE
Supply Voltage
Input Voltage Range (any input)
Operating Temperature Range
5.5V
-0.3 to (V
CC
+0.3)V
0°C to 70°C
-65°C to 150°C
300mW
260°C
2000V
GS1504
Storage Temperature
Power Dissipation
Lead Temperature (soldering, 10 sec)
Input ESD Voltage
DC ELECTRICAL CHARACTERISTICS
V
CC
= 5V, V
EE
= 0V, T
A
= 0°C to 70°C, Data Rate = 1.485Gb/s
PARAMETER
CONDITIONS
SYMBOL
MIN
TYP
MAX
UNITS
TEST
LEVELS
Positive Supply Voltage
Power Consumption
Supply Current
Output CM Voltage
Input DC Voltage
CLI DC Voltage (0m)
CLI DC Voltage (no signal input)
Cable Length Indicator Range
MCLADJ DC Voltage
0 - Max m
MCLADJ Input Voltage
Required to Mute Output
(max cable to 0m)
Output Voltage of CD/Mute
when Output is Active
Min to Mute; V
CD/Mute
Max to Activate; V
CD/Mute
2. Guaranteed by design.
Internal Bias. See Figure 2
CLI Output for 0m Cable
V
CC
4.75
-
-
3.75
-
-
0.9
5.00
250
50
4
2.7
3.3
1.3
2
3.1
5.25
-
65.0
4.25
-
-
1.7
-
3.4
V
mW
mA
V
V
V
V
V
V
1
1
1
1
1
4
1
2
1
CLI
-
2.80
MCLADJ Range
Mute DC Voltage
1
1.5
1.8
2.1
V
V
2
1
Voltage Required to Force Outputs to Mute
Voltage Required to Force Outputs Active
TEST LEVELS: 1. 100% tested at 25°C.
4.2
3.8
3. Correlated Value.
4. Using EB1504
V
V
2
2
GigaBERT
1400
EXT. CLOCK DATA
CLOCK OUT
OUT
50/75
2k
EXT.
CLOCK
1.485GHz
10k
15k
DVM
8281 or 1694A CABLE
IN
CLI
GS1504
EVAL. BOARD
MCLADJ
OUT
OUT
CH. 1
CH. 2
TDS 820
EXT. TRIGGER
Fig. 1 Test Setup
2
522 - 05 - 04
AC ELECTRICAL CHARACTERISTICS
V
CC
= 5V, V
EE
= 0V, T
A
= 0°C to 70°C, Data Rate = 1.485Gb/s
PARAMETER
CONDITIONS
SYMBOL
MIN
TYP
MAX
UNITS
TEST
LEVEL
Jitter
Equalization
100m (8281), PRN and pathological
Belden 8281
Belden 1694
-
-
-
-
-
-
-
160
80
100
150
130
2.8
1
50
200
135
-
-
270
.
-
-
240
ps p-p
m
m
ps
k
Ω
pF
Ω
1
1
GS1504
3
1
2
2
2
1
Output Rise/Fall Time
Input Resistance
Input Capacitance
Output Resistance
Output Signal Swing SDO, SDO
TEST LEVELS: 1. 100% tested at 25°C.
20% - 80%
Single Ended
Single Ended
Single Ended
Into 50
Ω
Loads; See Figure 21.
2. Guaranteed by design.
mVp-p
3. Correlated Value.
4. Using EB1504
PIN CONNECTIONS
CLI
V
CC
V
EE
SDI
SDI
V
EE
MCLADJ
NC
1
2
3
4
5
6
7
8
GS1504
TOP
VIEW
16
15
14
13
12
11
10
9
CD/MUTE
V
CC
V
EE
SDO
SDO
V
EE
NC
NC
PIN DESCRIPTIONS
NUMBER
SYMBOL
TYPE
DESCRIPTION
Cable Length Indication
. Provides a voltage output representing the amount of cable being
equalized. See figures 19 and 20. The CLI voltage is an approximation of the cable length
being equalized. It is intended as a guide for troubleshooting the initial design and not as an
accurate indication of cable length.
1
CLI
O
2, 15
3, 6, 11, 14
4, 5
7
V
CC
V
EE
SDI, SDI
MCLADJ
I
I
I
I
Most positive supply voltage.
Most negative supply voltage.
Differential Input Pins
. AC coupled termination is recommended.
Adjusts the 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
reached. To achieve maximum cable length, this pin should be left open. See figures 10 - 12.
No Connect
. Do not connect these pins to supply or ground.
Differential Serial Data Output Pins
, with 50
Ω
output resistance.
Carrier Detect/Mute Indicator/Control
. When the CD/Mute output is low, the carrier is present
and the data output is active. When the CD/Mute output is high, the carrier is not present and
the data output is muted (latched to the last state). This indicates that the maximum cable
length as set by MCLADJ has been reached.
8, 9, 10
12, 13
16
NC
SDO, SDO
CD/Mute
-
O
I/O
The above default CD/Mute function can be overwritten as follows: if the CD/Mute pin is tied
to ground the data output will not mute and the MCLADJ setting is overwritten. If the mute pin
is tied high, the data output will always mute and the MCLADJ setting is overwritten.
3
522 - 05 - 04
INPUT/OUTPUT CIRCUITS
All resistors in ohms, all capacitors in farads, unless otherwise shown.
V
CC
10k
6k
SDI
RC
7k
7k
-
+
CLI
6k
SDI
10k
GS1504
Fig. 2 Input Equivalent Circuit
Fig. 5 CLI Output Circuit
V
CC
V
CC
40k
+
MCLADJ
-
OUTPUT
STAGE
MUTE
CONTROL
20k
CD/MUTE
10k
42µ
Fig. 3 MCLADJ Equivalent Circuit
Fig. 6 CD/Mute Circuit
50
50
SDO
SDO
Fig. 4 Output Circuit
4
522 - 05 - 04
TYPICAL PERFORMANCE CURVES
(unless otherwise shown, V
CC
= 5V, T
A
= 25°C)
350
POWER CONSUMPTION (mW)
300
250
200
GS1504
150
MCLADJ
MCLADJ
100
50
0
0
20
40
60
80
Uncompensated
MCLADJ
Temperature Compensated
MCLADJ
TEMPERATURE (˚C)
Fig. 7 Power Consumption
Fig. 10 Temperature Compensation of MCLADJ
800
700
102
100
98
CABLE LENGTH (m)
600
96
94
92
90
88
86
84
Uncompensated
Compensated
JITTER (ps)
500
400
300
200
100
0
0
50
100
150
200
0
20
40
60
80
CABLE LENGTH (m)
TEMPERATURE (˚C)
Fig. 8 Typical Peak to Peak Jitter, PRN 2 -1, Belden 1694A
23
Fig. 11 Typical 1694A Cable Length vs. Temperature
(%)
CC
800
700
600
90
80
70
60
50
40
30
20
10
500
400
300
200
100
0
0
50
100
150
200
VOLTAGE NORMALIZED TO V
JITTER (ps)
0
0
50
100
150
200
CABLE LENGTH (m)
CABLE LENGTH (m)
Fig. 9 Typical Peak to Peak Jitter, PRN 2
23
-1, Belden 8281
Fig. 12 MCLADJ Input Voltage vs 1694A Cable Length
5
522 - 05 - 04
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