UPC1876 datasheet(23/40 Pages) NEC

23 / 40 page

µPC1876

Data Sheet S11666EJ4V0DS00

5.4

SAP VCO Adjustment

Perform this adjustment with the filter unless otherwise recommended.

Be sure to adjust SAP VCO after 5.2. Filter adjustment.

Usually, the filter and SAP VCO are adjusted simultaneously. For this reason, when this adjustment is performed,

the applications of the SAP VCO SETTING pin and the FILTER ADJUSTMENT pin are modified to add variable

resistor.

(1) Input no signal to the COMPOSITE SIGNAL INPUT pin and measure the DC voltage of the SAP SINGLE OUTPUT

pin.

(2) Input SAP signal (5 fH, no modulation) to the COMPOSITE SIGNAL INPUT pin. Adjust the variable resistor

connected to the SAP VCO SETTING pin so that the DC voltage of the SAP SINGLE OUTPUT pin may match

with the DC voltage measured in step (1).

5.5

List of Pin Settings in Adjustment

Pin Name

SAP1/2

ST/SAP

MUTE

FMONO

Adjustment

Stereo VCO Adjustment

––––

Filter Adjustment

–

L (OFF)

–

Separation Adjustment

–

L (OFF)

H (OFF)

SAP VCO Adjustment

–

L (OFF)

–

Remark –: Don’t care.

UPC1876 Scheda tecnica(PDF) 23 Page - NEC