Gennum Corporation GS1504-CTD, GS1504-CKD Datasheet

FEATURES

• SMPTE 292M compliant

• Automatic, adjustment free cable equalization for

1.485Gb/s HDTV signals

• Differential serial outputs ca pable 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.

™

HD-LINX

GS1504

HDTV Adaptive Equalizer

PRELIMINARY DATA SHEET

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
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.

/Mute

GS1504

MCLADJ

SDI
SDI

CABLE LENGTH INDICATOR/ADJUSTOR

EQUALIZER

PATENT PENDING

CARRIER DETECT

AGC

ORDERING INFORMATION

PART NUMBER PACKAGE TEMPERATURE

GS1504-CKD 16 pin narrow SOIC 0°C to 70°C

GS1504-CTD 16 pin Tape and Reel 0°C to 70°C

MUTE

DC

RESTORE

OUTPUT

CLI
CD/MUTE

SDO
SDO

BLOCK DIAGRAM

Revision Date: March 2000 Document No. 522 - 05 - 02

GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3

Tel. [phone] Fax. [phone] E-mail: [e-mail]

www.gennum.com

ABSOLUTE MAXIMUM RATINGS

TA = 25°C unless otherwise indicated

PARAMETER VALUE

Supply Voltage 5.5V

Input Voltage Range (any input) -0.3 to (V

Operating Temperature Range 0°C to 70°C

Storage Temperature -65°C to 150°C

Power Dissipation 300mW

Lead Temperature (soldering, 10 sec) 260°C

GS1504

Input ESD Voltage 2000V

DC ELECTRICAL CHARACTERISTICS

V

= 5V, V

CC

= 0V, TA = 0°C to 70°C, Data Rate = 1.485Gb/s

EE

PARAMETER CONDITIONS SYMBOL MIN TYP M AX UNITS

+0.3)V

CC

TEST
LEVELS

Positive Supply Voltage V

CC

4.75 5.00 5.25 V 1

Power Consumption - 250 - mW 1

Supply Current - 50 65.0 mA 1

Output CM Voltage 3.75 4 4.25 V 1

Input DC Voltage Internal Bias. See Figure 2 - 2.7 - V 1

CLI DC Voltage (0m) CLI Output for 0m Cable - 3.3 - V 4

CLI DC Voltage (no signal input) 0.9 1.3 1.7 V 1

Cable Length Indicator Range 0 - Max m CLI - 2 - V 2

MCLADJ DC Voltage MCLADJ Input Voltage

2.80 3.1 3.4 V 1

Required to Mute Output

MCLADJ Range (max cable to 0m) 1 V 2

Mute DC Voltage Output Voltage of CD

/Mute

1.5 1.8 2.1 V 1

when Output is Active

Voltage Required to Force Outputs to Mute Min to Mute; V

CD/Mute

Voltage Required to Force Outputs Active Max to Activate; V

CD/Mute

4.2 V 2

3.8 V 2

TEST LEVELS: 1. 100% tested at 25°C. 2. Guaranteed by design. 3. Correlated Value. 4. Using EB1504

1.485GHz

522 - 05 - 02

EXT.

CLOCK

EXT.

CLOCK

GigaBERT

1400

CLOCK

OUT

DATA

OUT

8281 or 1694A CABLE

50/75

2k

10k

15k

Fig. 1 Test Setup

2

DVM

CLI

GS1504

EVAL. BOARD

MCLADJ

OUTIN
OUT

CH. 1
CH. 2

EXT . TRIGGER

TDS 820

AC ELECTRICAL CHARACTERISTICS

V

= 5V, V

CC

= 0V, TA = 0°C to 70°C, Data Rate = 1.485Gb/s

EE

PARAMETER CONDITIONS SYMBOL MIN TYP MAX UNITS

Jitter 100m (8281), PRN and pathological - 80 135 ps p-p 1

Equalization Belden 8281 - 100 - m 1

Belden 1694 - 150 - m 3

Output Rise/Fall Time 20% - 80% - 130 270 ps 1

Input Resistance Single Ended - 2.8 . k

Ω

Input Capacitance Single Ended - 1 - pF 2

Output Resistance Single Ended - 50 -

Output Signal Swing SDO, SDO

Into 50Ω Loads; See Figure 21. 160 200 240 mVp-p 1

Ω

TEST LEVELS: 1. 100% tested at 25°C. 2. Guaranteed by design. 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

TEST

LEVEL

GS1504

2

2

PIN DESCRIPTIONS

NUMBER SYMBOL TYPE DESCRIPTION

1CLIO

Cable Length Indication

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.

2, 15 V

3, 6, 11, 14 V

4, 5 SDI, SDI

CC

EE

I Most positive supply voltage.

I Most negative supply voltage.

I

Differential Input Pins

7 MCLADJ I 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.

8, 9, 10 NC -

12, 13 SDO, SDO

16 CD

/Mute I/O

No Connect

O

Differential Serial Data Output Pins
Carrier Detect/Mute Indicator/Control

. Do not connect these pins to supply or ground.

and the data output is active. When the CD
the data output is muted (latched to the last state). This indicates that the maximum cable
length as set by MCLADJ has been reached.

The above default CD
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.

. Provides a voltage output representing the amount of cable being

. AC coupled termination is recommended.

, with 50Ω output resistance.

. When the CD/Mute output is low, the carrier is present

/Mute output is high, the carrier is not present and

/Mute function can be overwritten as follows: if the CD/Mute pin is tied

3

522 - 05 - 02

INPUT/OUTPUT CIRCUITS

All resistors in ohms, all capacitors in farads, unless otherwise shown.

6k

V

CC

10k

6k

SDI SDI

GS1504

7k

RC

Fig. 2 Input Equivalent Circuit

V

CC

40k

MCLADJ

42µ

+

-

10k

7k

-

+

CLI

Fig. 5 CLI Output Circuit

V

CC

OUTPUT
STAGE

MUTE

CONTROL

20k

CD/MUTE

10k

522 - 05 - 02

Fig. 3 MCLADJ Equivalent Circuit

50

50

Fig. 4 Output Circuit

Fig. 6 CD

SDOSDO

/Mute Circuit

4