Gennum Corporation GS1508-CTA, GS1508-CKA Datasheet

FEATURES

• SMPTE 292M compliant

• dual cable driving outputs optimized for driving data
up to 1.485Gb/s

• ±7% tolerance output

• >17dB output return loss

• minimum external components

• seamless interface with the HD-LINX™ family of
products

•low power

• standard packaging

APPLICATIONS

1.485Gb/s HDTV Serial Digital Receiver Interfaces for:

Routers, Distribution Amplifiers, Switchers, and other
transmitting equipment.

™

HD-LINX

GS1508

HDTV Cable Driver

PRELIMINARY DATA SHEET

DESCRIPTION

The GS1508 is a first generation very high speed bipolar

integrated circuit designed to drive two 75Ω co-axial

cables. The GS1508 is a SMPTE 292M compliant cable
driver that directly interfaces with other Gennum HDTV
devices and can also be used as a general purpose high
speed cable driver.

The GS1508 features two complementary outputs whose
amplitude is controlled within a precise ±7% variation. The
output amplitude can be varied by adjusting the R
resistor value.

The serial inputs can be AC coupled. The GS1508 is a low
power device that does not require external pull down
resistors. The GS1508 is packaged in an 8 pin SOIC and
operates from a single 5V power supply.

ORDERING INFORMATION

SET

GS1508

SDI

SDI

PART NUMBER PACKAGE TEMPERATURE

GS1508-CKA 8 pin SOIC 0°C to 70°C

GS1508-CTA 8 pin Tape and Reel 0°C to 70°C

BANDGAP REFERENCE AND BIASING CIRCUIT

INPUT

DIFFERENTIAL

PAIR

PATENT PENDING

OUTPUT STAGE &

CONTROL

R

SET

SDO

SDO

BLOCK DIAGRAM

Revision Date: March 2000 Document No. 522 - 02 - 03

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

+0.3)V

CC

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

GS1508

Input ESD Voltage 2000V

DC ELECTRICAL CHARACTERISTICS

VCC = 5V, TA = 0°C to 70°C unless otherwise shown.
Specifications assume 800mV output amplitude level settings into end terminated 75Ω transmission lines. Data Rate = 1485Mb/s unless otherwise shown.

PARAMETER CONDITIONS SYMBOL MIN TYP MAX UNITS NOTES

Supply Voltage V

System Power
Consumption

Driving two

75Ω cables

Supply Current

Common Mode Input

V

CC

P

D

I

S

CM,IN

4.75 5.00 5.25 V 1

- 215 265 mW 1

-4354mA 1

2.5+(V

)-V

DIFF/2

-(V

CC

)V 2

DIFF/2

Voltage Range

Common Mode Output

V

CM,OUT

-V

CC-VOUT

-V 2

Voltage Range

AC ELECTRICAL CHARACTERISTICS

VCC = 5V, TA = 0°C to 70°C unless otherwise shown.
Specifications assume 800mV output amplitude levels into end terminated 75Ω transmission lines. Data Rate = 1485Mb/s unless otherwise shown.

PARAMETER CONDITIONS SYMBOL MIN TYP MAX UNITS NOTES

Serial Digital Rate DC 1485 - Mb/s 1

Additive Jitter 1485Mb/s - 5 - ps

Differential Input V

Differential Output V

DIFF

OUT

150 - 800 mV diff p-p 2

750 800 850 mV p-p 1

RMS

13

TEST

LEVEL

TEST

LEVEL

Output Rise/Fall Times (20% - 80%) t

Mismatch in Output Rise/Fall

, t

R

F

- 120 250 ps 2 1

-1530ps 4

Times

Overshoot - 1 8 % 4

Duty Cycle Distortion - 15 30 ps 1

Output Return Loss 5MHz to 1485MHz - 17 - dB 2 4

NOTES:

1. RMS additive jitter measured using Pseudo Random bit sequence (2

2. Measured with Gennum Evaluation Board (EB1508).

23

- 1).

TEST LEVELS:

1. 100% tested at 25°C.

2. Guaranteed by design.

3. Correlated Value.

4. Tested with EB1508

2

522 - 02 - 03

PIN CONNECTIONS

R

SET

SDO

SDO

+

-

TOP

8

SDO

7

SDO

6

GND

5

V

CC

R

SDI

SDI

V

SET

EE

1

2

GS1508

3

VIEW

4

PIN DESCRIPTIONS

NUMBER SYMBOL TYPE DESCRIPTION

1, 2 SDI, SDI

3V

4R

5V

EE

SET

CC

I Serial data inputs (non-inverting and inverting).

P Most negative supply voltage.

I Output amplitude control resistor.

P Most positive supply voltage.

6 GND P Not connected internally. Connect to Ground. Used for isolation.

7, 8 SDO

, SDO O Serial data outputs (non-inverting and inverting).

INPUT / OUTPUT CIRCUITS

V

CC

GS1508

SDI

5k

SDI

20k

Fig. 1 (Pins 1 and 2) Fig. 2 (Pins 7 and 8)

3

522 - 02 - 03