GS3440 datasheet(1/23 Pages) GENNUM

Teilenummer	GS3440

Bauteilbeschribung	Automatic power-down on loss of signal

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Hersteller	GENNUM [Gennum Corporation]

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Proprietary and Confidential

GS3440 Adaptive Cable Equalizer

Final Data Sheet

Rev. 2

December 2012

Extended Reach 3G/HD/SD Adaptive Cable Equalizer

GS3440

www.semtech.com

Key Features

• SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259

compliant

• Automatic cable equalization

• Multi-standard operation from 125Mb/s to 2.97Gb/s

• Performance optimized for 270Mb/s, 1.485Gb/s and

2.97Gb/s. Typical equalized length of Belden 1694A

cable up to:

210m at 2.97Gb/s

300m at 1.485Gb/s

550m at 270Mb/s

• Supports DVB-ASI at 270Mb/s

• Supports MADI at 125Mb/s

• Manual bypass (useful for low data rates with slow

rise/fall times)

• Programmable carrier detect with squelch threshold

adjustment

• Automatic power-down on loss of signal

Standby power <35mW (typical)

• Differential output supports DC-coupling from 1.2V to

3.3V CML logic

• Option to compensate for 6dB flat attenuation prior to

input of device

• Selectable output de-emphasis: 2dB, 4dB and 6dB

• Standard EIA/JEDEC logic control and status signal

levels

• Single 3.3V power supply operation

• 180mW power consumption (typical)

• Wide operating temperature range of -40ºC to +85ºC

• Small footprint QFN package (4mm x 4mm)

Footprint compatible with the GS2974A, GS2974B,

GS2984 and GS2994

• Pb-free and RoHS compliant

Applications

• SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259

coaxial cable serial digital interfaces

Description

The GS3440 is a high-speed BiCMOS device designed to

equalize and restore signals received over 75

Ω coaxial

cable.

The device is designed to support SMPTE ST 424,

SMPTE ST 292 and SMPTE ST 259, and is optimized for

performance at 270Mb/s, 1.485Gb/s and 2.97Gb/s.

The GS3440 features DC restoration to compensate for the

DC content of SMPTE pathological signals.

The Carrier Detect output pin (CD) indicates whether an

input signal has been detected. It can be connected directly

to the SLEEP pin to enable automatic sleep on loss of carrier.

A voltage programmable threshold, set via the SQ_ADJ pin,

forces CD high when the input signal amplitude falls below

the threshold. This allows the GS3440 to distinguish

between low-amplitude SDI signals and noise at the input

of the device.

The equalizing and DC restore stages are disengaged and

no equalization occurs when the BYPASS pin is HIGH.

Setting the BYPASS pin HIGH is useful for signals launched

at the signal source with low data rates and/or slow rise/fall

times.

The GS3440 features a gain selection pin (GAIN_SEL) which

can be used to compensate for 6dB flat attenuation prior to

the input of the device.

The differential output can be DC-coupled to Semtech’s

reclockers and cable drivers, as well as industry-standard

1.2V, 1.8V, 2.5V and 3.3V CML logic by changing the voltage

applied to the VCC_O pin. In general, DC-coupling to any

termination voltage between 1.2V and 3.3V is supported.

The GS3440 also features programmable output

de-emphasis with three, user-selectable operating levels to

support long PCB traces at the output of the device.

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