saa7282 NXP Semiconductors, saa7282 Datasheet - Page 8

• Manufacturer Part Number: saa7282
• Description: Terrestrial Digital Sound Decoder Tdsd2
• Manufacturer: NXP Semiconductors

Philips Semiconductors
AMOGMDIS
This bit enables and disables the automute function (which
is activated according to the error limit registers).
Power-on resets to enabled (i.e. AMDIS = logic 0). AMDIS
should be disabled for the user definable mute (MUTE) to
be used.
MUTEDEF
This defines the operation of the user definable MUTE pin
when it is pulled LOW externally. If MUTEDEF is HIGH and
RSSF = logic 1, the output of the device is switched to FM
input. If MUTEDEF is HIGH and RSSF = logic 0, or if
MUTEDEF is LOW, the output is muted. Power on resets
to LOW.
Table 2 Output as a function of M1/M2 and DMSEL.
Table 3 Port 2 control.
Table 4 SSWIT signal states and function.
Note
1. Where x = don’t care.
July 1993
SSWIT3
Terrestrial Digital Sound Decoder (TDSD2)
0
0
0
0
1
1
DMSEL
0
0
1
1
PORT2
0
1
SSWIT2
0
0
1
1
x
x
M1/M2
SSWIT1
0
1
0
1
0
1
0
1
0
1
NICAM source de-emphasis switched out, no gain
NICAM source de-emphasis switched in, no gain
NICAM source de-emphasis switched in, 6 dB gain; power-on reset state
NICAM source de-emphasis switched in, 12 dB gain
external inputs switched in, no change to previous de-emphasis/gain setting
FM inputs switched in, no change to previous de-emphasis/gain setting
(1)
8
ERROR LIMIT REGISTERS
UPPER ERROR LIMIT REGISTER
This defines the number of errors in 128 ms period which
will cause automute to switch IN. User definable, but
power on resets to 50 Hex.
LOWER ERROR LIMIT REGISTER
This defines the number of errors in 128 ms period which
will cause automute to switch OUT. User definable, but
power on resets to 14 Hex.
PIN OUTPUT STATE
selects DIGITAL; L = M2, R = M2
selects DIGITAL; L = M1, R = M1
selects DIGITAL; L = M2, R = M1
selects DIGITAL; L = M1, R = M2
HIGH
LOW
FUNCTION
FUNCTION
Product specification
SAA7282