µPC1876

5

Data Sheet S11666EJ4V0DS00

CONTENTS

1.

INTERNAL EQUIVALENT CIRCUITS ............................................................................................

6

2.

FUNCTION OF EACH BLOCK .....................................................................................................13

2.1 Stereo Demodulation Block ................................................................................................... 14

2.2 SAP Demodulation Block ....................................................................................................... 15

2.3 dbx Noise Reduction Block ................................................................................................... 15

2.4 Matrix Block ............................................................................................................................ 17

3.

EXPLANATION OF EACH FUNCTION ........................................................................................ 18

3.1 Mode Matrix Table ................................................................................................................... 18

3.2 MATRIX MUTE Pin .................................................................................................................. 18

3.3 F-MONAURAL SELECTION Pin ............................................................................................. 19

3.4 STEREO/SAP SWITCH Pin .....................................................................................................19

3.5 SAP 1/2 SWITCH Pin ............................................................................................................... 19

4.

PRECAUTIONS ............................................................................................................................... 20

4.1 Impedance of Input Pins and Output Pins ........................................................................... 20

4.2 Output Load Impedance ........................................................................................................ 20

4.3 Cautions on External Components ....................................................................................... 21

4.4 Change of Electrical Characteristics Depending on External Components ..................... 21

4.5 BIAS (1.5 V) Pin ....................................................................................................................... 21

5.

ADJUSTMENT PROCEDURE ........................................................................................................ 22

5.1 Stereo VCO Adjustment ......................................................................................................... 22

5.2 Filter Adjustment .................................................................................................................... 22

5.3 Separation Adjustment .......................................................................................................... 22

5.4 SAP VCO Adjustment ............................................................................................................. 23

5.5 List of Pin Settings in Adjustment ........................................................................................23

6.

ELECTRICAL SPECIFICATIONS ................................................................................................... 24

7.

MEASURING CIRCUIT ................................................................................................................... 35

8.

DIFFERENCES BETWEEN THE

µPC1876GT AND µPC1872GT ............................................. 36

9.

PACKAGE DRAWING ..................................................................................................................... 37

10. RECOMMENDED SOLDERING CONDITIONS ............................................................................. 38