UPC1876 datasheet(18/40 Pages) NEC

18 / 40 page

µPC1876

Data Sheet S11666EJ4V0DS00

EXPLANATION OF EACH FUNCTION

Caution Apply bias voltage to the F-MONAURAL SELECTION pin, the MATRIX MUTE pin, the SAP 1/2 pin and

the STEREO/SAP SWITCH pin. Don’t leave those pins unconnected because those pins are base

open. Loss current is 0.1

µA or less.

Mode matrix table is shown in 3.1, and functions of mode switch pins are explained in 3.2 to 3.5.

3.1

Mode Matrix Table

L, R SIGNAL OUTPUT pin matrix table

Broadcasting

Control pin

Output

LED ON/OFF

mode

F-MONAURAL

STEREO/SAP

SAP1/2

L CHANNEL R CHANNEL

STEREO

SAP

SELECTION

SWITCH

OUTPUT

LED

OUTPUT

Monaural

–

L + R

OFF

H–

–

Stereo

–

L + R

OFF

L––

–

L + R

SAP

Monaural + SAP

SAP

OFF

M–

–

L + R

OFF

L––

H–

L + R

SAP

Stereo + SAP

SAP

M–

–

L + R

OFF

–

Remark When the noise detector detects noise, both the stereo and the SAP demodulation circuit stop.

The noise detector of the

µPC1876 detects noise near 180 kHz that is 30 mVr.m.s. (TYP.) or higher.

3.2

MATRIX MUTE Pin

The MATRIX MUTE pin controls muting of each output pin at muting operation.

Input signal level of the

R CHANNEL OUTPUT

SAP LED

MATRIX MUTE

L CHANNEL OUTPUT

STEREO LED

Mute is ON

OFF

Mute is OFF

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