STV1602A datasheet(14/22 Pages) STMICROELECTRONICS

14 / 22 page

GND

10k

Ω

-5V

10/16V

0.1

STV1602A

ADS

QSW

ESI

ESO

0.1

-5V

DIX

DIY

TN1

-5V

22k

Ω

SW3

µF/16V

PCX

RSE

-5V

FREQUENCY

MONITOR

0.1

Ω

-5V

Figure 10

Ω

100

Ω

47pF

µF

47pF

Monitor

OUT

Serial

MON

GND

AIX

AIY

STV1602A

Figure 11 : Equalizer Capacitor Coupling Input

Circuit

STV1602A GENERAL

As shown in the overall block diagram on page 7,

STV1602Ais composed of the following functions :

(1) Analog input as a primary input with automatic

equalizer to meet the loss characteristics of

coaxial cable

(2) Digital input as a secondary input to receive

the encoded signal from short distances within

the same printed circuit board or the same

equipment

(3) Phase locked loop (PLL) variable oscillator

(4) Reclocked serial output

(5) Serial descrambler

(6) SYNC detector

(7) Deserializer

(8) Parallel output buffer amplifiers

(9) Three diagnostic signals : eye monitor, SYNC

monitor and input data presence monitor

A brief explanation of each function is given in the

following sections.

1. Cable equalizer

Transmission of high speed digital data by means

of coaxial cable can greatly attenuate high fre-

quency components.According to the cable length,

received signals can widely differ from those sent;

in such conditions, clock extraction and data iden-

tification could be difficult.

The cable equalizer overcomes this problem.

The IC performs up to 30dB (typical) equalization

at 135MHz, typically 300m of high-grade coaxial

cable. The equalization is automatically performed

according to the coaxial cable length.

The input signal can be delivered either through a

transformer or through a capacitor.

When the digital input is selected, the equalizer is

disabled. Typical characteristics of the equalization

are given in Figure 31.

STV1602A

14/22

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