µPC1876

21

Data Sheet S11666EJ4V0DS00

4.3

Cautions on External Components

For stable temperature characteristics of stereo VCO, SAP VCO and filter, use the following for external

components.

Pin name

External parts

SAP VCO SETTING

Metal film resistor (

±1%),

FILTER ADJUSTMENT

Cermet (Variable resistor) (

±10%)

STEREO VCO SETTING

According to the license contract with THAT Corporation, use the following for external components.

With regard to the use of other external components, please contact to THAT Corporation.

Pin name

External parts

TIMING CURRENT SETTING

Metal film resistor (

±1%)

WIDE BAND RMS TIMING

Tantalum capacitor (

±10%)

SPECTRAL RMS TIMING

4.4

Change of Electrical Characteristics Depending on External Components

• SAP sensitivity can be down by inserting a resistor between the SAP DISCRIMINATION FILTER pin and GND.

• Stereo sensitivity can be down by inserting a resistor between the STEREO VCO FREE-RUN MONITOR SWITCH

pin and GND.

• Noise sensitivity can be changed by changing a resistor between the NOISE DETECTION FILTER pin and GND.

• Capture range can be changed by changing capacitor between the PHASE COMPARATOR FILTER pins

φD1 and

φD2. The smaller capacitor is, the wider capture range is, and the larger capacitor is, the narrower capture range

is. Please be careful because stereo distortion rate become worse if capacitor is too small.

• In case noise detection circuit doesn’t operate with stereo, it is necessary that capacitor between the PILOT

DISCRIMINATION FILTER pins is about 2.2

µF (Protection for miss operation in the weak electric field). The time

for changing to stereo, become longer if capacitor is too large.

4.5

BIAS (1.5 V) Pin

The BIAS (1.5 V) pin is the bias pin when adjusting the SAP VCO SETTING, the FILTER ADJUSTMENT, the

STEREO VCO SETTING, the WIDE BAND RMS SETTING, and the SPECTRAL RMS SETTING pins with laser-

trimming.