SAA7284ZP datasheet(2/40 Pages) PHILIPS

2 / 40 page

1996 Oct 24

Philips Semiconductors

Preliminary speciﬁcation

Terrestrial digital sound decoder for

conventional intercarrier PLL-IF systems

SAA7284

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

• Suitable for conventional intercarrier PLL-IF

(single SAW) TV/VCR systems

• 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 specification NICAM 728 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

Philips Semiconductors have pushed the boundaries of

Stereo Sound further with this addition to the successful

Terrestrial Digital Sound Decoder family. The SAA7284

device is an application specific version of the existing

SAA7283, with guaranteed improved specification on

selected parameters, enabling comparable RF

performance in conventional intercarrier PLL-IF systems,

to that of the SAA7283 in QSS systems.

The SAA7284 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

monostables 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.

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.

ORDERING INFORMATION

TYPE

NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

SAA7284ZP

SDIP52

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

SOT247-1

SAA7284GP

QFP64

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

body 14

× 20 × 2.8 mm

SOT319-2

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