July 1993
2
Philips Semiconductors
Product specification
Terrestrial Digital Sound Decoder (TDSD2)
SAA7282
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
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.
GENERAL DESCRIPTION
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.
QUICK REFERENCE DATA
ORDERING INFORMATION
Note
1. SAA7282ZP: 32-DIL32SHR; plastic (SOT232A); SOT232-1; 1996 November 28.
2. SAA7282GP: 44-QFP; plastic (SOT205AG); SOT205-1; 1996 November 28.
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
UNIT
V
DD
positive supply voltage
4.5
5.0
5.5
V
I
DD
supply current
-
50
100
mA
f
XTAL
crystal frequency
-
8.192
-
MHz
T
amb
operating ambient temperature
0
-
70
C
EXTENDED TYPE
NUMBER
PACKAGE
PINS
PIN POSITION
MATERIAL
CODE
SAA7282ZP
32
DIL32SHR
plastic
SOT232A
(1)
SAA7282GP
44
QFP
plastic
SOT205AG
(2)
July
1993
3
Philips Semiconductors
Product specification
T
errestrial Digital Sound Decoder (TDSD2)
SAA7282
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Fig.1 Block diagram; pin numbering for SOT232A.
handbook, full pagewidth
DIGITAL
AUDIO
INTERFACE
1-BIT
DAC
XTAL
OSC
FREQ.
SYNTH.
SAA7282ZP
VDAC
18
I C
2
4
SDA
PORT2
ADSEL
SCL
RESET
6
5
3
2
VDD
VSS
i.c.
26
27
29
1
30
31
XIN
XOUT
PCLK
7
28
17
MUTE
DOBM
VREF
MLB152
BIAS
CDL
EXTL
FML
19
22
21
25
24
23
20
V DDAL
VSSAL
OPL
INTL
11
VRC
15
8
9
10
VRO
INTR
VDDAR
VSSAR
CDR
EXTR
FMR
16
13
14
NOISE
SHAPER
DIGITAL
SWITCHING
NOISE
SHAPER
1-BIT
DAC
DATA
32
NICAM
728
DECODING
AUTO
MUTE
FILTER
DE-EMPH
VRC
VRC
OPR
12
July 1993
4
Philips Semiconductors
Product specification
Terrestrial Digital Sound Decoder (TDSD2)
SAA7282
PINNING
SYMBOL SOT205AG
SOT232A
DESCRIPTION
DOBM
1
28
digital audio interface output
V
SS
2
29
ground connection for the digital section
n.c.
3
-
not connected
XIN
4
30
crystal input at 256fs (8.192 MHz)
XOUT
5
31
crystal output at 256fs (8.192 MHz)
DATA
6
32
serial data input at 728 kbits/s from DQPSK demodulator
PCLK
7
1
output clock at 728 kHz to DQPSK demodulator
RESET
8
2
active LOW reset; used to set the device in a valid initial condition
SCL
9
3
clock input for I
2
C control bus
SDA
10
4
data port for I
2
C control bus, input/open drain output
PORT2
11
5
output mirroring the I
2
C control register bit PORT2
n.c.
12
-
not connected
ADSEL
13
6
I
2
C-bus slave address selection input; allows selection of one of two separate
slave addresses, defaults to logic 1
MUTE
14
7
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)
n.c.
15 to 17
-
not connected
V
DDAR
18
8
analog supply voltage for the right audio channel
V
SSAR
19
9
analog ground connection for the right audio channel
VRO
20
10
internal reference voltage buffer output
VRC
21
11
internal reference voltage buffer HIGH impedance node
n.c.
22
-
not connected
OPR
23
12
analog output from the right audio channel
EXTR
24
13
external analog input to the right audio channel
FMR
25
14
FM sound input to the right audio channel
INTR
26
15
integrator output from the right audio channel
CDR
27
16
integrator connection to an external damping capacitor
n.c.
28
-
not connected
V
REF
29
17
reference voltage input; 2.5 V (typical)
V
DAC
30
18
quiet V
SS
to DACs
CDL
31
19
integrator connection to an external damping capacitor
INTL
32
20
integrator output from the left audio channel
FML
33
21
FM sound input to the left audio channel
EXTL
34
22
external analog input to the left audio channel
OPL
35
23
analog output from the left audio channel
n.c.
36
-
not connected
V
SSAL
37
24
analog ground connection for the left audio channel
V
DDAL
38
25
analog supply voltage for the left audio channel
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