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CXA2020M/S
EIAJ Sound Multiplexing Decoder
Description The CXA2020M/S, is a bipolar IC designed as EIAJ TV sound multiplexing decoder, provides various functions including sound multiplexing demodulation, broadcast mode identification (stereo/bilingual discrimination display), mode display, and muting. Features * Adjustment free of filter. * High frequency stereo separation improved. * An internal active filter greatly reduces the external parts. * Use of the countdown method for broadcast mode identification eliminates the necessity of adjusting the identification system (Cue oscillator). * Output level: 520mVrms (1kHz, monaural, 100%). * Internal filter eliminates interference from digital facsimile signals. * The discrimination time needed to shift from multiplexing sound to monaural sound is reduced. * Forced monaural mode can be set to operate only for stereo broadcasts or for stereo/bilingual broadcasts. Applications * Color TVs * Hi-Fi VCRs Structure Bipolar silicon monolithic IC Pin Configuration
GND 1 NC 2 REFL 3 Vcc 4 NC 5
CXA2020M 28 pin SOP (Plastic)
CXA2020S 22 pin SDIP (Plastic)
Absolute Maximum Ratings (Ta = 25C) [ ( ) is the pin No. for the CXA2020S.] * Supply voltage VCC 10 * Input signal (Pin 6) Vis 0.6 * Control voltage (Pins 5, 12, 13, 14) Vic VCC * Operating temperature Topr -20 to +75 * Storage temperature Tstg -65 to +150 * Allowable power dissipation PD (A2020M) 1000 (A2020S) 900 * LED drive current ILED 10 Operating Supply Voltage Range 8.5 to 9.5
V Vp-p V C C mW mW mA V
CXA2020M
28 SUBI 27 NC 26 SC OUT 25 SC IN 24 NC GND 1 NC 2 REFL 3 Vcc 4
CXA2020S
22 SUBI 21 SC OUT 20 SC IN 19 MC OUT
CXA2020M
MPX IN 7 NC 8 CUBI 9
22 MC IN 21 L OUT 20 R OUT 19 M OUT 18 FOMO 17 MUTE 16 MODE 15 NC
MPX IN 6 NC CUBI 7 8
CXA2020S
MO MODE 6
23 MC OUT
MO MODE 5
18 MC IN 17 L OUT 16 R OUT 15 M OUT 14 FOMO 13 MUTE 12 MODE
NC 10 LEDST 11 LEDSU 12 LEDM 13 NC 14
LEDST 9 LEDSU 10 LEDM 11
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
-1-
E94Y28-ST
CXA2020M/S
Block Diagram CXA2020M
MC OUT SC OUT M OUT R OUT L OUT FOMO MODE MC IN SUBI SC IN MUTE NC NC NC
15 14 12 LED DRIVE 11
28
27
26
25
24
23
22
21
20
19
18
17
16
TEST
SUBDEEM
MAINDEEM MAIN SUB
OUTPUT AMP & OUTPUT SW LR
MAIN OUT
FM DEMOD
MATRIX IIL LOGIC & CONT CUE CARRIER 3.5fH 952Hz CLOCK CLOCK 3.5fH VCO 952Hz BPF LED DRIVE
SUB DET SUB BPF 4.5fH TRAP CUE BPF
BUFFER BIAS CURRENT BIAS VOLTAGE VOLTAGE REGULATOR
AM DEMOD
COMP
IN AMP
IBIAS
1
2
3
4
5
6
7
MPX SIGNAL 9 8
10
11
12
13
MO MODE
LEDST
CUBI
NC
GND
REFL
MPX IN
NC
NC
LEDSUB
NC
CXA2020S
MC OUT SC OUT M OUT R OUT FOMO L OUT MODE LEDMAIN SUBI SC IN MC IN MUTE
22
21
20
19
18 TEST
17
16
15
14
13
SUBDEEM
MAINDEEM
OUTPUT AMP & OUTPUT SW MAIN LR SUB
MAIN OUT
FM DEMOD
MATRIX IIL LOGIC & CONT CUE CARRIER 3.5fH 952Hz CLOCK CLOCK 3.5fH VCO 952Hz BPF
SUB DET SUB BPF 4.5fH TRAP CUE BPF
BUFFER BIAS CURRENT BIAS VOLTAGE VOLTAGE REGULATOR
AM DEMOD
COMP
IN AMP
IBIAS
1
2
3
4
5
6
MPX SIGNAL 7
8
9
10
MO MODE
MPX IN
CUBI
NC
LEDST
NC
-2-
LEDSUB
REFL
GND
Vcc
LEDMAIN
Vcc
NC
CXA2020M/S
Pin Description (Ta = 25C, VCC = 9V) PIn No. SOP SDIP 1 2 5 8 10 14 15 24 27 1 Symbol GND Pin voltage 0
The pin numbers in parentheses are for the CXA2020S. Equivalent circuit GND. Description
2 7
NC
--
--
Keep these pins open. (They are not connected to the chip.)
Vcc
147
3
3
REFL
1.2V
3 3.3k 20k 24k 20k GND
The noise elimination filter connection of internal reference voltage.
4
4
VCC
--
Power supply. Forced monaural mode selection. When Low or open, the forced monaural mode operates for stereo broadcasts only; if High, the forced monaural mode operates for both stereo and bilingual broadcasts.
6 (5) 70k
6
5
MO MODE
--
50k 10.5k GND
Vcc 138k 147
7
6
MPXIN
4.1V
7 (6) 25k 80 30k 4.2V GND
Sound multiplexing signal input. Typical input level = 70mVrms (monaural, 100%)
Vcc
1k 147 40k 40k
Vcc
9
8
CUBI
4.1V
11k 2k 4.2V
9 (8) 40k
Bias capacitor connection of Cue pulse generator.
-3-
CXA2020M/S
Pin No. SOP SDIP
Symbol
Pin voltage
11 (9) 12 (10) 13 (11)
Equivalent circuit
Description
11
9
LEDST
10.5k 10.5k 64k 10.5k 64k 64k 16k 16k
12
10
LEDSU
--
Mode indicator LED connection. Pin 11 (9): stereo Pin 12 (10): sub Pin 13 (11): main
13
11
LEDM
16k GND
Vcc 20
16
12
MODE
--
20k 16 (12) 10.5k
16k 4.2V 40k GND
DC voltage-based output mode switch for bilingual broadcasts.
17 (13) 70k
17
13
MUTE
--
50k 10.5k GND GND
Output muting. When High, only DC is output from Pins 19, 20 and 21 (15, 16 and 17).
18 (14) 70k
18
14
FOMO
--
50k 10.5k GND GND
Forced monaural. When High, forced monaural (main sound) mode is selected and the LED turns off.
Vcc
Vcc 147 17.2k
19
15
MOUT
4.1V
19 (15) 1.5m 32k GND 32k
Main signal output. Always outputs the main signal component, regardless of the broadcast mode.
-4-
CXA2020M/S
Pin No. SOP SDIP
Symbol
Pin voltage
Equivalent circuit
Vcc 147 17.2k
Description
Vcc
20
16
ROUT
4.1V
20 (16) 1.5m 32k GND 32k
R-ch output.
Vcc Vcc 147 17.2k
21
17
LOUT
4.1V
21 (17) 1.5m 32k GND 32k
L-ch output. During "TEST", the Cue signal component passed through the Cue BPF is output.
Vcc Vcc 147
Vcc
22
18
MCIN
4.1V
23 (19)
147 20P 147 147 22
DC cut capacitor connection of main signal.
160
23
19
MCOUT
3.4V
(18)
16k 4.2V 80 80
GND
Vcc
Vcc
25
20
SCIN
4.1V
147 26 (21) Vcc 40k 147 25 (20) 147 16k 4.2V 4.2V 80 80 GND 320 20P 8k
DC cut capacitor connection of sub signal.
26
21
SCOUT
3.9V
80
20
Vcc
Vcc 16k
64k
28
22
SUBI
4.1V
16k 28 (22) 147 4.2V 1.7V 147 1k 8k 8k
Bias capacitor connection of sub FM detector. "TEST" mode, used for filter adjustment, is activated by grounding this pin.
-5-
CXA2020M/S
Electrical Characteristics Measurement Circuit (CXA2020M)
SW1 ON OFF 15kHz LPF SW2 SW3 CCIR FILTER MEASUREMENT SYSTEM RMS DISTORTION DCVOLT
TEST (ON) SW4
NORM (OFF) C9 1F C10 1F
R OUT
L OUT
C10 10F
MAIN OUT
SW6
E2
E3
E4
GND GND GND 28 27 26 25 24 23 22 21 20 19 18 17 16 15
CXA2020M
1
2
3
4
5
6 E5
7
8
9
10
11
12
13
14
C1 10F
GND
C4 10F R2 910
R3 910
R4 910
C2 47F
E1 9V
SIGNAL GND
SIG
ATT ATT is set to bring L R stereo separation to a minimum.
SW5
-6-
MAIN
SUB
C3 10F
STEREO
A
CXA2020M/S
Electrical Characteristics (Ta = 25C, VCC = 9V) SW No. Item Current consumption Bias
Symbol condi- condi-
The pin numbers in parentheses are for the CXA2020S. Measurement point Pin 4 Min. Typ. Max. Unit
Conditions Measure current input to Pin 4 Input signal: SIG1 Measure output amplitude (400Hz, sine wave) of Pins 20 and 21 (16 and 17): Vs1 (15kLPF) Input signal: SIG2 Measure output amplitude (1kHz, sine wave) of Pins 20 and 21 (16 and 17): Vs2 Vs2 Fs1 = 20log Vs1 (15kLPF) Input signal: SIG3 Measure output amplitude (10kHz, sine wave) of Pins 20 and 21 (16 and 17): Vs3 Vs3 Fs2 = 20log Vs1 (15kLPF) Input signal: SIG2 Measure distortion of output signal (1kHz, sine wave) of Pins 20 and 21 (16 and 17) (15kLPF) Input signal: SIG2 Measure S/N ratio of output (1kHz) of Pins 20 and 21 (16 and 17) (15kLPF, RMS) Input signal: SIG4 Measure distortion of output signal (1kHz, sine wave) of Pin 21 (17) (15kLPF) Input signal: SIG5 Measure distortion of output signal (1kHz, sine wave) of Pin 20 (16) (15kLPF)
tions tions 1 ICC 1 1
17
25
36
mA
2
Sub output level 400Hz
Vs1
4
2 and 3
Pins 20 and 21 (16 and 17) 1
480
580
690 mVrms
3
Sub frequency characteristics 1kHz
Fs1
4
2 and 3
Pins 20 and 21 (16 and 17) 1
-1.6
-0.6
0
dB
4
Sub frequency characteristics 10kHz
Fs2
4
2 and 3
Pins 20 and 21 (16 and 17) 1
-19.0 -16.5 -14.0
dB
5
Sub distortion
Ds
4
2 and 3
Pins 20 and 21 (16 and 17) 1
--
1
2
%
6
Sub S/N ratio
Ns
4
2 and 3
Pins 20 and 21 (16 and 17) 1
59
64
--
dB
7
Stereo distortion L-ch
Dstl
4
2
Pin 21 (17)
--
0.2
1.5
%
8
Stereo distortion R-ch
Dstr
4
2
Pin 20 (16)
--
0.2
1.5
%
1 When bias condition is "3", measurement point is Pin 20 only. -7-
CXA2020M/S
SW No. Item
Bias Conditions Input signal: SIG4 Measure output amplitude (1kHz, sine wave) of Pin 21 (17) (15kLPF) Input signal: SIG5 Measure output amplitude (1kHz, sine wave) of Pin 20 (16) (15kLPF) Input signal: SIG6 Measure output signal (400Hz, sine wave) of Pin 19 (15) (15kLPF) Input signal: SIG6 Measure amplitude of output signal (400Hz, sine wave) of Pins 20 and 21 (16 and 17) (15kLPF) Input signal: SIG7 Measure output amplitude (1kHz, sine wave) of Pins 20 and 21 (16 and 17): Vm3 Vm3 Fm1 = 20log Vm2 (15kLPF) Input signal: SIG8 Measure output amplitude (10kHz, sine wave) of Pins 20 and 21 (16 and 17): Vm4 Vm4 Fm2 = 20log Vm2 (15kLPF) Input signal: SIG7 Measure distortion of output signal (1kHz, sine wave) of Pin 19 (15) (15kLPF)
Symbol condi- condi-
tions tions
Measurement point
Min.
Typ.
Max.
Unit
9
Stereo output level L-ch 1kHz
Vstl
4
2
Pin 21 (17)
440
540
640 mVrms
10
Stereo output level R-ch 1kHz
Vstr
4
2
Pin 20 (16)
440
540
640 mVrms
11
Main output level MAIN OUT
Vm1
4
2
Pin 19 (15)
480
580
690 mVrms
12
Main output level
Vm2
4
2
Pins 20 and 21 (16 and 17)
480
580
690 mVrms
13
Main frequency characteristics 1kHz
Fm1
4
2
Pins 20 and 21 (16 and 17)
-1.6
-0.6
0
dB
14
Main frequency characteristics 10kHz
Fm2
4
2
Pins 20 and 21 -16.0 -14.0 -12.0 (16 and 17)
dB
15
Main distortion Dm1 MAIN OUT
4
2
Pin 19 (15)
--
0.2
1
%
-8-
CXA2020M/S
SW No. Item
Bias Conditions Input signal: SIG7 Measure distortion of output signal (1kHz, sine wave) of Pins 20 and 21 (16 and 17) (15kLPF) Input signal: SIG9 Measure distortion of output signal (1kHz, sine wave) of Pins 20 and 21 (16 and 17) (15kLPF) Input signal: SIG7 Measure S/N ratio of output signal (1kHz) of Pins 20 and 21 (16 and 17) (15kLPF. RMS) Input signal: SIG4 Sstr =
Symbol condi- condi-
tions tions
Measurement point Pins 20 and 21 (16 and 17)
Min.
Typ.
Max.
Unit
16
Main distortion Dm2
4
2
--
0.2
1
%
17
Main distortion at maximum Dm3 input
4
2
Pins 20 and 21 (16 and 17)
--
0.3
2
%
18
Main S/N ratio
Nm
4
2
Pins 20 and 21 (16 and 17)
65
73
--
dB
19
Stereo separation LR
Sstr
4
2
Output amplitude Pin 21 (17) 20log Output amplitude Pin 20 (16) (dB) (15kLPF) Input signal: SIG5 Sstl =
Pins 20 and 21 (16 and 17)
35
45
--
dB
20
Stereo separation RL
Sstl
4
2
Output amplitude Pin 20 (16) 20log Output amplitude Pin 21 (17) (dB) (15kLPF) Input signal: SIG15 Calculate the level difference between the output amplitude of Pins 20 and 21 (16 and 17) (Vms1) and the measured value (Vm3) in measurement No. 13 Vm3 Cms1 = 20log (dB) Vms1 (15kLPF, 1kBPF)
Pins 20 and 21 (16 and 17)
35
45
--
dB
21
Cross talk MAIN SUB
Cms1
2
2
Pins 20 and 21 (16 and 17)
55
58
--
dB
-9-
CXA2020M/S
SW No. Item
Bias Conditions Input signal: SIG2 Calculate the level difference between the output amplitude of Pins 20 and 21 (16 and 17) (Vsm1) and the measured value (Vs2) in measurement No. 3. Vs2 Csm1 = 20log Vsm1 (dB) (15kLPF, 1kBPF) Input signal: SIG15 Calculate the level difference between the output amplitude of Pin 20 (16) (Vms2) and the output amplitude of Pin 21 (17) (Vms3). Cms2 = 20log Vms3 (dB) Vms2 (15kLPF, 1kBPF)
Symbol condi- condi-
tions tions
Measurement point
Min.
Typ.
Max.
Unit
22
Cross talk SUB MAIN
Csm1
2
1
Pins 20 and 21 (16 and 17)
60
70
--
dB
23
Cross talk MAIN SUB BOTH mode
Cms2
2
3
Pins 20 and 21 (16 and 17)
55
58
--
dB
24
Cross talk SUB MAIN BOTH mode
Csm2
2
3
Input signal: SIG2 Calculate the level difference between the output amplitude of Pin 21 (17) (Vsm2) and the output amplitude of Pin 20 (16) (Vsm3). Csm2 = 20log Vsm3 (dB) Vsm2 (15kLPF, 1kBPF)
Pins 20 and 21 (16 and 17)
60
70
--
dB
25
Residual carrier SUB
Lcs
3
2
Input signal: SIG11 Measure subcarrier component amplitude of the output of Pins 20 and 21 (16 and 17). Input signal: SIG11 Measure the subcarrier component amplitude of the output of Pins 20 and 21 (16 and 17). Input signal: SIG7 Calculate the level difference between the output amplitude of Pins 20 and 21 (16 and 17) (VMm) and the measured value (Vm3) in measurement No. 13. Mm = 20log Vm3 (dB) VMm (15kLPF, 1kBPF) - 10 -
Pins 20 and 21 (16 and 17) Pins 20 and 21 (16 and 17)
--
10
30
mVrms
26
Residual carrier MAIN
Lcm
3
1
--
12
20
mVrms
27
Mute volume MAIN
Mm
4
4
Pins 20 and 21 (16 and 17)
70
80
--
dB
CXA2020M/S
SW No. Item
Bias Conditions Input signal: SIG2 Caluculate the level difference between the output amplitude of Pins 20 and 21 (16 and 17) (VMs) and the measured value (Vs2) in measurement No. 3. Vs2 Ms = 20log (dB) VMs (15kLPF, 1kBPF) Input signals: SIG4, 5 Measure the level difference between the output signals of Pins 20 and 21 (16 and 17) under bias conditions 2 and 4. Mst = Measured value under bias condition 2 (mVrms) 20log Measured value under bias condition 4 (mVrms)
Symbol condi- condi-
tions tions
Measurement point
Min.
Typ.
Max.
Unit
28
Mute volume SUB
Ms
4
4
Pins 20 and 21 (16 and 17)
70
80
--
dB
29
Mute volume stereo
Mst
4
2 and 4
Pins 20 and 21 (16 and 17) 2
70
80
--
dB
30
DC offset stereo L-ch
Ostl
3
2 and 4
Input signal: SIG18 Measure the fluctuation Pin 21 in the output DC level of (17) Pin 21 (17) under bias conditions 2 and 4. Input signal: SIG18 Measure the fluctuation Pin 20 in the output DC level of (16) Pin 20 (16) under bias conditions 2 and 4. Input signal: No signal Measure the fluctuation Pin 19 in the output DC level of (15) Pin 19 (15) under bias conditions 2 and 4. Input signal: SIG12 Change SIG12 and measure amount of attenuation at the point "monaural" switches to "Sound multiplex". Input signal: SIG13 Change SIG13 and measure amount of attenuation at the point "monaural" switches to "Sound multiplex".
--
20
100
mV
31
DC offset stereo R-ch
Ostr
3
2 and 4
--
20
100
mV
32
DC offset MAIN OUT
Om
3
2 and 4
--
20
100
mV
33
Cue detection sensitivity
CD
4
2
--
9
14
17
dB
34
SUB detection sensitivity
SD
4
2
--
10
13
18
dB
2 Measure Pin 21 for SIG4 input; Pin 20 for SIG5 input. - 11 -
CXA2020M/S
SW No. Item
Bias Conditions
Symbol condi- condi-
tions tions 35 Cue BPF gain CG 5 2
Measurement point
Min.
Typ.
Max.
Unit
Input signal: SIG14 Pin 21 Measure the output (17) amplitude of Pin 21 (17). Input signal: SIG16, 17 Measure output amplitude of Pin 28 (22) and then measure the level difference in the output signal for SIG16 input and SIG17 input. Pin 28 TG = (22) Measured value for SIG16 (mVrms) 20log Measured value for SIG17 (mVrms)
330
480
620 mVrms
36
4.5fH trap attenuation level
TG
6
2
20
38
--
dB
SW Condition Table SW NO 1 2 3 4 5 6 1 off off off on off off 2 off on off off off off 3 off off on off on on 4 off off off off on off 5 off off off off on on 6 off off off off off on
BIAS Condition Table BIAS NO 1 2 3 4 E1 9V 9V 9V 9V E2 E3 E4 E5
0.5V 0.5V 0.5V 0.5V 4.5V 0.5V 0.5V 0.5V 2.5V 0.5V 0.5V 0.5V 4.5V 4.5V 0.5V 0.5V
- 12 -
CXA2020M/S
Input Signal Definition SIG1 : Sound MPX signal Main : 0% Sub : 400Hz, 100% MOD Cue : Bilingual SIG2 : Sound MPX signal Main : 0% Sub : 1kHz, 100% MOD Cue : Bilingual SIG3 : Sound MPX signal Main : 0% Sub : 10kHz, 100% MOD Cue : Bilingual SIG4 : Sound MPX signal L-ch : 1kHz, 100% R-ch : 0% Cue : Stereo SIG5 : Sound MPX signal L-ch : 0% R-ch : 1kHz, 100% Cue : Stereo SIG6 : Sound MPX signal Main : 400Hz, 100% Sub : Carrier off Cue : Cue signal off SIG7 : Sound MPX signal Main : 1kHz, 100% Sub : Carrier off Cue : Cue signal off SIG8 : Sound MPX signal Main : 10kHz, 100% Sub : Carrier off Cue : Cue signal off SIG9 : Sound MPX signal Main : 1kHz, 300% Sub : Carrier off Cue : Cue signal off SIG10 : Sound MPX signal L-ch : 1kHz, 100% R-ch : 0% Cue : Cue signal off SIG11 : Sound MPX signal Main : 0% Sub : 0% (Carrier only) Cue : Bilingual SIG12 : Sound MPX signal Main : 0% Sub : 0% (Carrier only) Cue : Bilingual (level adjusted to minimum) SIG13 : Sound MPX signal Main : 0% Sub : 0% (level adjusted to minimum) Cue : Bilingual SIG14 : 55.069kHz 5.6mVrms sine wave
SIG15 : Sound MPX signal Main : 1kHz, 100% Sub : 0% (Carrier only) Cue : Bilingual SIG16 : 31.47kHz 42mVrms SIG17 : 70.80kHz 42mVrms sine wave
sine wave
SIG18 : Sound MPX signal L-ch : 0% R-ch : 0% Cue : Stereo
Sound MPX signal level is defined as 100% MONO at 1Vp-p. - 13 -
CXA2020M/S
Output and LED On/Off Table Forced Forced monaural MUTE Broadcast SUB BOTH MAIN MODE monaural condition x Stereo x x ON ON ON Bilingual ON ON ON x x Monaural x x x x x x x x x x x x x x x x x x x F.MONO F.MONO F.MONO F.MAIN F.MAIN F.MAIN F.MAIN x x x OFF ON x x x x OFF OFF OFF ON x x x OFF OFF ON OFF OFF OFF OFF OFF OFF OFF ON MODE SW Output condition L L L+R DC SUB MAIN MAIN SUB MAIN MAIN MAIN DC R R L+R DC SUB SUB MAIN SUB SUB MAIN MAIN DC LED On/Off condition SUB OFF OFF OFF ON ON OFF ON ON OFF OFF OFF OFF OFF MAIN OFF OFF OFF OFF ON ON OFF ON ON OFF OFF OFF OFF
MAIN STEREO L+R L+R DC MAIN MAIN MAIN MAIN MAIN MAIN MAIN DC ON OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF
OFF MONO MONO MONO ON DC DC DC
x: No response Control Voltage Range The information in parentheses is for the CXA2020S. Voltage range SUB MODE SW Pin 16 (Pin12) Forced monaural Pin 18 (Pin 14) MUTE Pin 17 (Pin 13) BOTH MAIN on off on off 4.5V to VCC 2V to 3V(or open) 0V to 0.5V 3V to VCC 0V to 0.5V (or open) 3V to VCC 0V to 0.5V (or open) 3V to VCC 0V to 0.5V (or open)
Forced monaural mode F.MAIN Pin 6 (Pin 5) F.MONO
Description of Operation The information in parentheses is for the CXA2020S. The sound mutiplexing signal input from Pin 7 (Pin 6) is passed through IN AMP and is applied to the Cue BPF, Sub BPF, and Main de-emphasis circuit. 1. Discrimination circuits Cue BPF passes only the Cue signal component from the multiplex signal. In the AM demodulator, the signal (AM wave) is AM detected and one of two sine waves is generated, either a 922.5Hz signal for bilingual broadcasts or a 982.5Hz signal for stereo broadcasts. In the 952Hz BPF, the 3.5fH carrier component is eliminated from the Cue signal after AM wave detection. The Cue signal, from which the carrier component has been eliminated, is waveform shaped by COMP, with the resulting 922.5Hz or 982.5Hz pulse being applied to the Logic section. In the 3.5fH VCO, a 3.5fH pulse locked onto the Cue signal carrier (3.5fH) is created and sent to the Logic section. In the Logic section, the broadcast mode is identified using the countdown method. Depending on this result as well as the presence of a SUB signal from SUB detector and the MUTE ON/OFF, MODE switching, and FOMO ON/OFF instructions from CONT, the output switching control signal is created. This signal is used to control the output condition of OUTPUT SW and MAIN OUT. - 14 -
CXA2020M/S
2. Main circuits In MAIN DEEM, de-emphasis is applied to the Main signal component and the Sub and Cue components are removed. After passing through the MAIN DEEM, the Main signal is applied to MATRIX, OUTPUT AMP, and MAINOUT. 3. Sub circuits In SUB BPF, only the SUB signal component out of multiplex signals is passed through. In the 4.5fH trap, the digital facsimile signal component is removed. In FM Demod, the SUB signal is FM demodulated. In SUB DEEM, the FM demodulated Sub signal is de-emphasized and the carrier component is removed. After passing through SUB DEEM, the Sub signal is applied to MATRIX and OUTPUT AMP. 4. MATRIX and output circuits In MATRIX, the L and R signals are created by adding and subtracting the Main signal from MAIN DEEM and the Sub signal from SUB DEEM in stereo broadcast. In OUTPUT AMP and OUTPUT SW, the output signal is switched under the control of Logic. In addition, MAIN OUT always outputs the MAIN signal component, regardless of the broadcast mode. Adjustment Separation adjustment
EIAJ sound multiplexing encoder Application circuit MPX IN RL Oscilloscope AC Voltmeter
VR2 L. OUT R. OUT
CH1 CH2 1kHz BPF
Switch
Fig. 1 Procedure 1) Connect components as shown in Fig. 1. (Set SW4 to NORM.) 2) Set the encoder to stereo mode, and input a 100% modulated 1kHz signal; also set the encoder so that only the L-ch is output. 3) Monitor the oscilloscope and AC voltmeter and adjust VR2 so that the R-ch is at a minimum. (Separation standard: 35dB or more)
- 15 -
CXA2020M/S
Application Circuit CXA2020M
R OUT L OUT MAIN OUT
C10 10F TEST (ON) SW4 28 NORM (OFF) C9 1F
R6 2.4k
R5 2.4k BOTH
ON
C8 1F 25 24 23
ON MAIN
OFF
OFF
C7 C6 C5 10F 10F 10F
SW3 22 21 20 19 18
SW2 17 16
SW1 15
SUB
R7 3.6k
27
26
CXA2020M
1
2
3
4
5
6
7
8
9
10
11
12
13
14
F. MONO
F. MAIN
C1 10F
C4 10F
SW5 70mVrms (MONO 100%)
R2 910
R3 910
MAIN
R4 910 Vcc 9V R5 2.4k BOTH SUB SW1 R7 3.6k
C2 47F
VR2 1k
GND
MPX IN
SW5: F. MONO- Forced monaural mode operates only for stereo. F. MAIN- Forced monaural mode operates for both stereo and bilingual.
CXA2020S
L OUT MAIN OUT R OUT
C10 10F TEST (ON) SW4 22 NORM (OFF) C9 1F C8 1F
R6 2.4k
OFF
ON
C6 10F C7 10F 17 16
OFF
ON
MAIN
21
20
19
18
C5 SW3 SW2 10F 13 12 15 14
CXA2020S
1
2
3
4
5
6
7
8
9
10
11
F. MONO
C1 10F
F. MAIN
C4 10F
SW5
R2 910 70mVrms (MONO 100%)
R3 910
R4 910 Vcc 9V
C2 47F
VR2 1k
GND
MPX IN
SW5: F. MONO- Forced monaural mode operates only for stereo. F. MAIN- Forced monaural mode operates for both stereo and bilingual.
Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.
- 16 -
MAIN
SUB
C3 10F
STEREO
SUB
C3 10F
STEREO
CXA2020M/S
Example of Representative Characteristics
De-emphasis characteristics
SUB BPF frequency characteristics
Output level [dB]
Output level [dB]
Main Sub 100 1k Frequency [Hz] 10k
0 -20 -40 -60 10 20 30 40 50 60 70 80 90 100
0 -5 -10 -15
Frequency [kHz]
Cue BPF frequency characteristics
3
MAIN distortion characteristics
Attenuation level [dB]
2 0 -20 -40 -60
Distortion [%]
1
3.5fH -40k
3.5fH -20k
3.5fH
3.5fH +20k
3.5fH +40k
100
200
300
400
500
MAIN modulation factor [%]
Frequency [Hz]
- 17 -
CXA2020M/S
Package Outline CXA2020M
Unit: mm
28PIN SOP (PLASTIC) 375mil
+ 0.4 18.8 - 0.1 28 15
+ 0.4 2.3 - 0.15
0.15 + 0.2 0.1 - 0.05
+ 0.3 7.6 - 0.1
10.3 0.4
9.3
1 0.45 0.1
14 1.27
+ 0.1 0.2 - 0.05
0.12 M
PACKAGE STRUCTURE
PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE SOP-28P-L04 SOP028-P-0375-D LEAD TREATMENT LEAD MATERIAL PACKAGE WEIGHT EPOXY / PHENOL RESIN SOLDER PLATING 42 ALLOY 0.7g
CXA2020S
22PIN SDIP (PLASTIC)
+ 0.1 0.05 0.25 -
12
+ 0.4 19.2 - 0.1
22
+ 0.3 6.4 - 0.1
1 1.778
11
0.5 0.1 + 0.15 0.9 - 0.1
+ 0.15 3.25 - 0.2
0.51 MIN
+ 0.4 3.9 - 0.1
PACKAGE STRUCTURE
MOLDING COMPOUND SONY CODE EIAJ CODE JEDEC CODE SDIP-22P-01 SDIP022-P-0300 LEAD TREATMENT LEAD MATERIAL PACKAGE WEIGHT EPOXY RESIN SOLDER PLATING COPPER ALLOY 0.95g
- 18 -
7.62
0.5 0.2
0 to 15

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