SAA7282ZP datasheet(8/25 Pages) PHILIPS

8 / 25 page

July 1993

Philips Semiconductors

Product speciﬁcation

Terrestrial Digital Sound Decoder (TDSD2)

SAA7282

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.

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.

Table 2

Output as a function of M1/M2 and DMSEL.

Table 3

Port 2 control.

Table 4

SSWIT signal states and function.(1)

Note

1. Where x = don’t care.

DMSEL

M1/M2

FUNCTION

selects DIGITAL; L = M2, R = M2

selects DIGITAL; L = M1, R = M1

selects DIGITAL; L = M2, R = M1

selects DIGITAL; L = M1, R = M2

PORT2

PIN OUTPUT STATE

LOW

HIGH

SSWIT3

SSWIT2

SSWIT1

FUNCTION

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

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