Philips Semiconductors
Preliminary specification
Terrestrial Digital Sound Decoder
(TDSD3)
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 I
2
C-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.
ORDERING INFORMATION
TYPE
NUMBER
SAA7283ZP
SAA7283GP
PACKAGE
NAME
SDIP52
QFP64
DESCRIPTION
plastic shrink dual in-line package; 52 leads (600 mil)
plastic quad flat package; 64 leads (lead length 1.95 mm);
body 14
×
20
×
2.8 mm
SAA7283
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.
VERSION
SOT247-1
SOT319-2
1996 Oct 24
2
Philips Semiconductors
Preliminary specification
Terrestrial Digital Sound Decoder (TDSD3)
PINNING
PIN
SYMBOL
SDIP52
MUTE
DOBM
V
DDA
V
SSA
V
RCA
EXTR
FMR
OPR
n.c.
V
ROA
V
SSDAC
n.c.
OPL
FML
EXTL
PORM
PORA
REMVE
REMO
SEYE
SOFF
V
SSF1
VCLK
V
DDF1
VCONT
MIXREF
DQPSK
COFF
CEYE
PKDET
V
ROF
I
REF
V
RCF
V
DDF2
V
SSF2
n.c.
CLKLPF
1996 Oct 24
1
2
3
4
5
6
7
8
9 and 10
11
12
13 and 14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
QFP64
(1)
57
59
61
62
63
2
3
4
9 and 10
7
8
−
11
12
13
14
15
16
17
21
22
23
24
25
27
28
29
30
31
34
35
36
37
38
39
40
41
DESCRIPTION
SAA7283
active LOW mute input; function defined by MUTEDEF (control bit in the
I
2
C-bus register)
digital audio interface output that can be 3-stated via I
2
C-bus
analog supply voltage for the audio channels
analog ground connection for the audio channels
internal audio reference voltage buffer (high-impedance node)
external analog input to the right audio channel
FM sound input to the right audio channel
analog output from the right audio channel
not connected; left open-circuit in application
internal audio reference voltage buffer output
quiet ground connection to DACs
not connected; left open-circuit in application
analog output from the left audio channel
FM sound input to the left audio channel
external analog input to the left audio channel
active LOW power-on reset mute input; mute cleared by setting silence bit
HIGH in I
2
C-bus (internal pull-up)
power-on reset audio select input (internal pull-up)
carrier loop-filter connection
carrier loop-filter output
sine channel eye pattern output for monitoring
sine channel offset compensator capacitor output
demodulator ground connection 1
carrier loop VCO clock output for monitoring
demodulator supply voltage 1
carrier loop VCO control voltage input
mixer voltage reference or input when using differential DQPSK signal
DQPSK input signal
cosine channel offset compensator capacitor output
cosine channel eye pattern output for monitoring
AGC peak detector storage capacitor output
internal demodulator reference voltage buffered output
internal demodulator reference current output
internal demodulator reference voltage unbuffered output
demodulator supply voltage 2
demodulator ground connection 2
not connected; left open-circuit in application
clock loop-phase comparator output
5
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