SAA7283ZP datasheet(2/36 Pages) PHILIPS

2 / 36 page

1996 Oct 24

Philips Semiconductors

Preliminary speciﬁcation

Terrestrial Digital Sound Decoder

(TDSD3)

SAA7283

FEATURES

• Single-chip solution including FM and vision filters,

analog demodulator and audio switching

• Dual standard with automatic selection between PAL

system I and BGH including French NICAM L system)

• Single low-radiation crystal oscillator for improved EMC

• Stereo bitstream audio DACs

• Programmable attenuator for matching levels of NICAM

and FM audio sources at the output of the device

• Full EBU NICAM 728 specification demodulation and

decoding

• Digital Audio Interface conforming with EBU/IEC 958

• Automatic mute function which switches from NICAM to

FM sound when NICAM fails

• Compatible with either single-ended or differential

DQPSK input signals

• Microcomputer controlled via I2C-bus (up to 400 kHz

specification).

APPLICATIONS

• Television receivers

• Video cassette recorders.

GENERAL DESCRIPTION

The SAA7283 is a NICAM receiver solution, developing

the well established high quality Terrestrial Digital Sound

decoder family from Philips Semiconductors.

This innovative IC with analog front-end, offers more

impressive features and flexibility with minimum external

circuitry.

The SAA7283 takes, as input, a second IF (intercarrier)

Terrestrial TV PAL signal, and performs all the Differential

Quadrature Phase Shift Keying (DQPSK) demodulation,

digital decoding and digital-to-analog conversion

necessary to produce a complete NICAM receiver on a

single integrated circuit.

The demodulator function includes integrated baseband

filters for pulse shaping and unwanted signal rejection,

automatic gain control, a low jitter integrated VCO, digital

monostable for precise data sampling points and a

multi-standard controller to enable automatic locking to

either a PAL system I or PAL system BGH input signal

(including French NICAM L system).

The decoder function performs the descrambling,

de-interleaving and reformatting operations required to

recover the original data words.

The data words are processed through a stereo digital

filter, digital de-emphasis network, second order noise

shaper and 256 times oversampling Bitstream audio DAC.

The SAA7283 then provides a switching output buffer for

selecting between FM, NICAM and daisy-chain inputs, and

a programmable level attenuation matrix for matching

levels of the FM and NICAM audio sources at the output of

the device. An additional feature is the inclusion of a Digital

Audio Interface (DAI) output IEC 958, which may be

disabled if required.

ORDERING INFORMATION

TYPE

NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

SAA7283ZP

SDIP52

plastic shrink dual in-line package; 52 leads (600 mil)

SOT247-1

SAA7283GP

QFP64

plastic quad ﬂat package; 64 leads (lead length 1.95 mm);

body 14

× 20 × 2.8 mm

SOT319-2

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