UPC1876 datasheet(3/40 Pages) NEC

3 / 40 page

µPC1876

Data Sheet S11666EJ4V0DS00

BLOCK DIAGRAM

Notes 1. Do not leave the Internally Connected (IC) pin open because it is a base-open pin. Connect this pin to VCC

or GND.

2. Am: Amplitude modulation (Carrier frequency is 31.5 kHz (2fH))

Remark Use the following for external parts.

Resistor (

∗) : Metal film resistor (±1%). Unless otherwise specified; ±5%

Capacitors (

∗∗) : Tantalum capacitor (±10%). Unless otherwise specified; ±20%

Variable resistors:

±10%

ROT

VCC

1 k

Ω

LED

Driver

Mode

Selector

Matrix

Offset

Absorp-

tion

Wide-

Band

RMS

Wide-

Band

VCA

Wide-

Band

RMS

Filter

Trap

LPF

Spectral

RMS

Filter

Spectral

RMS

2.19 kHz

LPF

408 Hz

LPF

Stereo

VCO

De-

emphasis

SAP

VCO

Note 2

Note 1

L-R

Demodulator

L+R

LPF

Pilot

Discrimination

Phase

Comparator

Stereo

LPF

Stereo

Phase

Comparator

Pilot

Canceller

–

Phase

Detector

SAP

LPF

Loop

Filter

SAP

Detector

SAP

BPF

Noise

BPF

Noise

Detector

ST/SAP

SAP1/2

ST/SAP

MUTE

FMONO

LOT

10 F

1 F

0.1 F

22 F

1.5 V

33 k

Ω∗

SAPVA

10 k

Ω 33 kΩ∗

1 k

Ω

47 k

Ω∗

0.1 F

20 k

Ω

1 F

4.7 F +

1 k

Ω

VCC

20 k

Ω

∗∗

3.3

∗∗

WTI

51 k

Ω 100 kΩ

51 k

Ω

50 k

Ω

56 k

Ω∗

56 k

Ω∗

5.1 k

Ω

3 k

Ω +

1 F

VCC

0.1 F

68 k

Ω

0.47 F

0.047 F

0.01 F

2.2 F

STL

GND

MOA1

MOA2

FLTA

STI

DCO

SAPL

LGND

1 F

SPA

WBA

ITI

WRB

SRB

VCC

WBVI

VEO

fHSW

SOT

NDT

SDT

SDI

SBO

COM

1/2

VCC

1/2

1/4

VRE

STVA

PD1

PD2

VOA

Variable

Emphasis

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