INTEGRATED CIRCUITS
DATA SHEET
SAA7282
Terrestrial Digital Sound Decoder
(TDSD2)
Product specification
File under Integrated Circuits, IC02
July 1993
Philips Semiconductors
Product specification
Terrestrial Digital Sound Decoder (TDSD2)
FEATURES
•
Full EBU NICAM 728 specification decoder
•
Microcomputer controlled via I
2
C-bus
•
Automatic decoding and output configuration depending
upon transmission:
– digital stereo
– digital mono and data
– 2 independent mono signals
•
On board RAM for de-interleaving and 10 to 14-bit word
expansion
•
Automatic mute function which silences the digital data
and switches to FM sound (if valid) when error rate
exceeds user definable limit
•
User mute function (MUTE pin) to enable user to
perform muting to their own software algorithm if
required, or to simply silence the output
•
4 times over-sampling digital filter
•
Selectable digital de-emphasis
•
256 times over-sampling Noise Shapers
•
Fully integrated 1-bit DACs
•
Integrated switching networks allowing selection
between NICAM Sound, FM Sound or external
“Daisy-Chain” input
•
Digital Audio Interface conforming with EBU/IEC 958
•
I
2
C-bus transceiver enabling a master device to read
– status information
QUICK REFERENCE DATA
SYMBOL
V
DD
I
DD
f
XTAL
T
amb
supply current
crystal frequency
operating ambient temperature
PARAMETER
positive supply voltage
4.5
−
−
0
MIN.
5.0
50
8.192
−
TYP.
5.5
100
−
70
MAX.
GENERAL DESCRIPTION
– error count byte
– additional data bits
and write:
– switch control codes
– decoder control
– upper and lower error rate limits.
APPLICATIONS
•
Television receivers
•
Video cassette recorders.
SAA7282
Performing all digital decoding functions for a NICAM 728
digital stereo sound system, the SAA7282 is a highly
integrated CMOS circuit which only requires a DQPSK
(Differential Quadrature Phase Shift Keying) demodulator
(TDA8732) and minimum external components to achieve
a full NICAM solution.
The device may also be interfaced to other DQPSK
demodulators.
UNIT
V
mA
MHz
°C
ORDERING INFORMATION
EXTENDED TYPE
NUMBER
SAA7282ZP
SAA7282GP
Note
1. SAA7282ZP: 32-DIL32SHR; plastic (SOT232A); SOT232-1; 1996 November 28.
2. SAA7282GP: 44-QFP; plastic (SOT205AG); SOT205-1; 1996 November 28.
July 1993
2
PACKAGE
PINS
32
44
PIN POSITION
DIL32SHR
QFP
MATERIAL
plastic
plastic
CODE
SOT232A
(1)
SOT205AG
(2)
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Philips Semiconductors
Product specification
SAA7282
Fig.1 Block diagram; pin numbering for SOT232A.
handbook, full pagewidth
July 1993
VDAC
CDL
19
V DDAL
VSSAL
OPL
VRC
1-BIT
DAC
23
24
20
25
INTL
18
SCL SDA ADSEL
3
4
6
PORT2
5
I C
2
2
RESET
AUTO
MUTE
NOISE
SHAPER
21
22
10
DIGITAL
SWITCHING
FILTER
DE-EMPH
BIAS
11
13
14
NOISE
SHAPER
SAA7282ZP
FML
EXTL
VRO
VRC
EXTR
FMR
Terrestrial Digital Sound Decoder (TDSD2)
DATA
32
NICAM
728
DECODING
3
DIGITAL
AUDIO
INTERFACE
1-BIT
DAC
XTAL
OSC
30
XOUT MUTE
DOBM
31
7
28
17
V REF
16
CDR
15
INTR
26
i.c.
VDD
27
VSS
29
12
8
VRC
9
MLB152
FREQ.
SYNTH.
OPR
V DDAR
V SSAR
1
PCLK
XIN
Philips Semiconductors
Product specification
Terrestrial Digital Sound Decoder (TDSD2)
PINNING
SYMBOL SOT205AG
DOBM
V
SS
n.c.
XIN
XOUT
DATA
PCLK
RESET
SCL
SDA
PORT2
n.c.
ADSEL
MUTE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SOT232A
28
29
−
30
31
32
1
2
3
4
5
−
6
7
digital audio interface output
ground connection for the digital section
not connected
crystal input at 256fs (8.192 MHz)
crystal output at 256fs (8.192 MHz)
serial data input at 728 kbits/s from DQPSK demodulator
output clock at 728 kHz to DQPSK demodulator
DESCRIPTION
SAA7282
active LOW reset; used to set the device in a valid initial condition
clock input for I
2
C control bus
data port for I
2
C control bus, input/open drain output
output mirroring the I
2
C control register bit PORT2
not connected
I
2
C-bus slave address selection input; allows selection of one of two separate
slave addresses, defaults to logic 1
active LOW mute input; when set LOW, sets the digital data to zero and either
silences the output or switches it to analog FM, depending on the status of
MUTEDEF (control bit in the I
2
C register) and RSSF; overridden by automute
(if automute is used, then MUTE is automatically pulled LOW)
not connected
analog supply voltage for the right audio channel
analog ground connection for the right audio channel
internal reference voltage buffer output
internal reference voltage buffer HIGH impedance node
not connected
analog output from the right audio channel
external analog input to the right audio channel
FM sound input to the right audio channel
integrator output from the right audio channel
integrator connection to an external damping capacitor
not connected
reference voltage input; 2.5 V (typical)
quiet V
SS
to DACs
integrator connection to an external damping capacitor
integrator output from the left audio channel
FM sound input to the left audio channel
external analog input to the left audio channel
analog output from the left audio channel
not connected
analog ground connection for the left audio channel
analog supply voltage for the left audio channel
n.c.
V
DDAR
V
SSAR
VRO
VRC
n.c.
OPR
EXTR
FMR
INTR
CDR
n.c.
V
REF
V
DAC
CDL
INTL
FML
EXTL
OPL
n.c.
V
SSAL
V
DDAL
15 to 17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
−
8
9
10
11
−
12
13
14
15
16
−
17
18
19
20
21
22
23
−
24
25
July 1993
4
Philips Semiconductors
Product specification
Terrestrial Digital Sound Decoder (TDSD2)
SAA7282
SYMBOL SOT205AG
n.c.
i.c.
n.c.
V
DD
39 to 41
42
43
44
SOT232A
−
26
−
27
not connected
DESCRIPTION
internally connected; must be left open-circuit in application
not connected
digital supply voltage
handbook, halfpage
PCLK
RESET
SCL
SDA
PORT2
ADSEL
MUTE
VDDAR
V SSAR
1
2
3
4
5
6
7
8
SAA7282ZP
9
32 DATA
31 XOUT
30 XIN
29 V SS
28 DOBM
27 VDD
26 i.c.
25 VDDAL
24 VSSAL
23 OPL
22 EXTL
21 FML
20 INTL
19 CDL
18 VDAC
17 VREF
MLB153
VRO 10
VRC
11
OPR 12
EXTR 13
FMR 14
INTR 15
CDR 16
Fig.2 Pin configuration (SOT232A).
July 1993
5
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