SAA3500H 데이터 시트보기 (PDF) - Philips Electronics

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SAA3500H

Digital audio broadcast channel decoder

Philips Electronics 

Philips Semiconductors

Digital audio broadcast channel decoder

Preliminary specification

SAA3500H

A[17:0]

D[7:0]

RD

WR

Fig.5 RAM access.

9.3 Parallel output interface

The digital parallel output interface can be used in 3 different modes depending on the OCIR and OEN select pins.

Output data shall be latched on the falling edge of OCLK.

Table 2 Parallel output modes

X = don’t care.

OCIR OEN

DESCRIPTION

0

0 channel impulse response sampled at 64 kHz, OIQ = frame trigger

1

0 baseband sampled at 2048 kHz and with I and Q data multiplexed

X

1 OUT[7:0], OIQ and OCLK disabled

By means of an external digital-to-analog converter, either the CIR or I/Q data can be displayed on an oscilloscope.

Digital output data is clocked out on the falling edge of the OCLK output signal. In case of baseband output the OIQ signal

indicates, if the current sample is either I or Q data.

OCLK

OUT[7:0]

OIQ

Q

I

Q

I

Q

4096 kHz

signed

2048 kHz

Fig.6 Baseband output signals (OCIR = HIGH, OEN = LOW).

OCLK

OUT[7:0]

OIQ

64 kHz

unsigned

trigger

Fig.7 CIR output signals (OCIR = LOW, OEN = LOW).

2000 Jun 14

10

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