DATA SHEET
BIPOLAR ANALOG INTEGRATED CIRCUIT
µ
PC1876
US MTS DECODER
DESCRIPTION
The
µ
PC1876 is an integrated circuit for US MTS (Multi Channel Television Sound) system. All functions for US
MTS system are provided on one chip. The
µ
PC1876 has built-in SAP (Sub Audio Program) discrimination error
protection circuit.
FEATURES
• BTSC (USA) standard demodulator (Stereo demodulation and TV-dbx noise reduction)
• Only four adjustments (2 separation, 1 stereo VCO, 1 filter)
• Supply voltage: 8 V to 10 V
• Circuit current: 27 mA TYP. (Supply voltage: 9 V)
• Input and output level (L+R, 100% modulation)
Input level: 0.42 V
p-p
Output level: 1.41 V
p-p
APPLICATION
• TV sets and VCRs for North America
ORDERING INFORMATION
Part Number
Package
42-pin plastic SSOP (9.53 mm (375))
µ
PC1876GT
The
µ
PC1876 is available only to licensees of THAT Corporation.
Please contact: (03) 5790-5391 (Japan)
(508) 229-2500 (USA)
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Document No. S11666EJ4V0DS00 (4th edition)
Date Published June 2000 N CP(K)
Printed in Japan
The mark
shows major revised points.
©
1996
µ
PC1876
SYSTEM BLOCK DIAGRAM (TV)
Tuner
PIF
&
SIF
Color, intensity and
deflecting signal
processor
Color
output
CRT
Vertical
output
DTS
interface
µ
PC1876
Dual attenuator/
Matrix surround
processor
Sound
output
Degital
tuning
controller
Remote control
reception amplifier
PIN photo-diode
2
Data Sheet S11666EJ4V0DS00
µ
PC1876
BLOCK DIAGRAM
V
CC
1 kΩ
V
CC
STL
SAP1/2
ST/SAP
MUTE
FMONO
22
23
24
25
26
27
Mode
Selector
Offset
Absorp-
tion
Wide-
Band
RMS
Filter
LED
Driver
Wide-
Band
VCA
21
20
19
18
17
16
15
Spectral
RMS
14
13
12
ST/SAP
SW
32
33
34
35
1/2
36
37
38
39
40
1/4
Stereo
VCO
Pilot
Discrimination
Phase
Comparator
Stereo
Phase
Comparator
Pilot
Canceller
Phase
Detector
SAP
Detector
1/2
V
CC
De-
emphasis
SAP
VCO
SAP
LPF
L+R
LPF
Loop
Filter
Noise
Detector
Noise
BPF
408 Hz
LPF
Variable
Emphasis
2.19 kHz
LPF
11
10
9
8
7
6
5
4
3
SAP
BPF
Stereo
LPF
+
–
SAPL
DCO
1 kΩ
V
CC
20 kΩ
LGND
WTI
STI
10
µ
F∗∗
+
3.3
µ
F∗∗
+
100 kΩ
50 kΩ
Wide-
Band
RMS
Note 1
IC
SPA 51 kΩ
WBA 51 kΩ
ITI
10
µ
F ROT
28
+
10
µ
F LOT
29
+
1
µ
F
+
VOA
GND
MOA1
0.1
µ
F
MOA2
VRE
+
1.5 V
33 kΩ∗
SAPVA
FLTA
STVA
PD1
0.1
µ
F
PD2
30
31
Matrix
f
H
Trap
LPF
Spectral
RMS
Filter
56 kΩ∗
56 kΩ∗
WRB 5.1 kΩ +
SRB 3 kΩ +
V
CC
WBVI
VEO
fHSW
SI
SOT
NDT
SDT
SDI
SBO
COM
+
2.2
µ
F
+
0.47
µ
F
0.047
µ
F
0.01
µ
F
0.1
µ
F
68 kΩ
0.1
µ
F
1
µ
F
V
CC
1
µ
F
22
µ
F
Note 2
L-R
AM
Demodulator
10 kΩ 33 kΩ∗
20 kΩ
47 kΩ∗
1 kΩ
4.7
µ
F +
φ
D1
41
+
1
µ
F
φ
D2
42
2
1
Notes 1.
Do not leave the Internally Connected (IC) pin open because it is a base-open pin. Connect this pin to V
CC
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%
Data Sheet S11666EJ4V0DS00
3
µ
PC1876
PIN CONFIGURATION (Top View)
42-pin plastic SSOP (9.53 mm (375))
COMPOSITE SIGNAL INPUT
SAP BPF OUTPUT
SAP DISCRIMINATION FILTER INPUT
SAP DISCRIMINATION FILTER
NOISE DETECTION FILTER
SAP SINGLE OUTPUT
SAP SINGLE INPUT
STEREO VCO FREE-RUN MONITOR SWITCH
VARIABLE EMPHASIS OUTPUT
WIDE-BAND VCA INPUT
POWER SUPPLY (9 V)
SPECTRAL RMS OFFSET ABSORPTION
WIDE-BAND RMS OFFSET ABSORPTION
TIMING CURRENT SETTING
WIDE-BAND RMS SETTING
SPECTRAL RMS SETTING
SPECTRAL RMS TIMING
WIDE-BAND RMS TIMING
LED GND
DC OUTPUT
SAP LED DRIVER
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
COM
SBO
SDI
SDT
NDT
SOT
SI
fHSW
VEO
WBVI
V
CC
SRB
WRB
ITI
WBA
SPA
STI
WTI
LGND
DCO
SAPL
φ
D2 42
φ
D1 41
PD2
PD1
STVA
FLTA
SAPVA
1.5 V
VRE
MOA2
MOA1
GND
VOA
LOT
ROT
IC
FMONO
MUTE
ST/SAP
SAP1/2
STL
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
PHASE COMPARATOR FILTER 2
PHASE COMPARATOR FILTER 1
PILOT DISCRIMINATION FILTER 2
PILOT DISCRIMINATION FILTER 1
STEREO VCO SETTING
FILTER ADJUSTMENT
SAP VCO SETTING
BIAS (1.5 V)
1/2 V
CC
FILTER
MONAURAL OFFSET ABSORPTION 2
MONAURAL OFFSET ABSORPTION 1
SIGNAL GND
VCA OFFSET ABSORPTION
L CHANNEL OUTPUT
R CHANNEL OUTPUT
INTERNAL CONNECTION
F-MONAURAL SELECTION
MATRIX MUTE
STEREO/SAP SWITCH
SAP 1/2 SWITCH
STEREO LED DRIVER/
STEREO VCO FREE-RUN MONITOR
4
Data Sheet S11666EJ4V0DS00
µ
PC1876
CONTENTS
1. INTERNAL EQUIVALENT CIRCUITS ............................................................................................
2. FUNCTION OF EACH BLOCK .....................................................................................................
2.1 Stereo Demodulation Block ...................................................................................................
2.2 SAP Demodulation Block .......................................................................................................
2.3 dbx Noise Reduction Block ...................................................................................................
2.4 Matrix Block ............................................................................................................................
3. EXPLANATION OF EACH FUNCTION ........................................................................................
3.1 Mode Matrix Table ...................................................................................................................
3.2 MATRIX MUTE Pin ..................................................................................................................
3.3 F-MONAURAL SELECTION Pin .............................................................................................
3.4 STEREO/SAP SWITCH Pin .....................................................................................................
3.5 SAP 1/2 SWITCH Pin ...............................................................................................................
4. PRECAUTIONS ...............................................................................................................................
4.1 Impedance of Input Pins and Output Pins ...........................................................................
4.2 Output Load Impedance ........................................................................................................
4.3 Cautions on External Components .......................................................................................
4.4 Change of Electrical Characteristics Depending on External Components .....................
4.5 BIAS (1.5 V) Pin .......................................................................................................................
5. ADJUSTMENT PROCEDURE ........................................................................................................
5.1 Stereo VCO Adjustment .........................................................................................................
5.2 Filter Adjustment ....................................................................................................................
5.3 Separation Adjustment ..........................................................................................................
5.4 SAP VCO Adjustment .............................................................................................................
5.5 List of Pin Settings in Adjustment ........................................................................................
6
13
14
15
15
17
18
18
18
19
19
19
20
20
20
21
21
21
22
22
22
22
23
23
6. ELECTRICAL SPECIFICATIONS ................................................................................................... 24
7. MEASURING CIRCUIT ................................................................................................................... 35
8. DIFFERENCES BETWEEN THE
µ
PC1876GT AND
µ
PC1872GT ............................................. 36
9. PACKAGE DRAWING ..................................................................................................................... 37
10. RECOMMENDED SOLDERING CONDITIONS ............................................................................. 38
Data Sheet S11666EJ4V0DS00
5
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