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. CXA2020M 28 pin SOP (Plastic) CXA2020S 22 pin SDIP (Plastic) Absolute Maximum Ratings (Ta = 25°C) [ ( ) 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 Applications • Color TVs • Hi-Fi VCRs V Vp-p V °C °C mW mW mA 8.5 to 9.5 V Structure Bipolar silicon monolithic IC CXA2020M GND 1 CXA2020S 28 SUBI NC 2 27 NC REFL 3 NC 5 24 NC MO MODE 6 MPX IN 7 NC 8 CXA2020M 25 SC IN 21 SC OUT NC 2 26 SC OUT Vcc 4 22 SUBI GND 1 REFL 3 20 SC IN Vcc 4 23 MC OUT MO MODE 5 22 MC IN MPX IN 6 21 L OUT 19 MC OUT CXA2020S Pin Configuration 18 MC IN 17 L OUT 20 R OUT NC 7 NC 10 19 M OUT CUBI 8 15 M OUT LEDST 11 18 FOMO LEDST 9 14 FOMO LEDSU 12 17 MUTE LEDM 13 16 MODE LEDSU 10 13 MUTE LEDM 11 12 MODE CUBI 9 NC 14 15 NC 16 R OUT 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 NC SC OUT SC IN NC MC OUT MC IN L OUT R OUT M OUT FOMO MUTE MODE NC 28 27 26 25 24 23 22 21 20 19 18 17 16 15 TEST SUBI Block Diagram CXA2020M OUTPUT AMP & OUTPUT SW MAINDEEM SUBDEEM MAIN MAIN OUT L R SUB FM DEMOD MATRIX IIL LOGIC & CONT 11 COMP LED DRIVE 13 12 14 NC 10 LEDST MPX SIGNAL 9 8 7 952Hz BPF LEDMAIN AM DEMOD CUBI Vcc REFL CUE BPF NC MO MODE IN AMP 6 4 3 NC 5 NC 2 GND 4.5fH TRAP VOLTAGE REGULATOR IBIAS 1 BIAS VOLTAGE MPX IN BIAS CURRENT NC SUB BPF BUFFER 3.5fH 952Hz CLOCK CLOCK 3.5fH VCO CUE CARRIER LEDSUB SUB DET MODE 18 MUTE MC IN 19 FOMO MC OUT 20 M OUT SC IN 21 R OUT SC OUT 22 L OUT SUBI CXA2020S 17 16 15 14 13 12 TEST SUBDEEM MAINDEEM OUTPUT AMP & OUTPUT SW MAIN L R MAIN OUT SUB FM DEMOD MATRIX IIL LOGIC & CONT SUB DET 5 NC REFL Vcc MO MODE 6 –2– MPX SIGNAL 7 COMP LED DRIVE 8 9 10 11 LEDMAIN 4 952Hz BPF LEDSUB 3 AM DEMOD LEDST 2 MPX IN 1 GND IN AMP VOLTAGE REGULATOR IBIAS CUE BPF NC 4.5fH TRAP BIAS VOLTAGE 3.5fH 952Hz CLOCK CLOCK 3.5fH VCO CUBI SUB BPF BUFFER BIAS CURRENT CUE CARRIER CXA2020M/S Pin Description (Ta = 25°C, VCC = 9V) PIn No. SOP SDIP Symbol The pin numbers in parentheses are for the CXA2020S. Pin voltage 1 1 GND 0 2 5 8 10 14 15 24 27 2 7 NC — Equivalent circuit Description GND. Keep these pins open. (They are not connected to the chip.) — Vcc 147 3 3 REFL 1.2V 3 3.3k 20k 20k 24k 4 4 VCC GND — 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) 6 5 MO MODE The noise elimination filter connection of internal reference voltage. 70k 50k 10.5k GND Vcc 138k 147 7 6 MPXIN 4.1V 7 (6) 30k 25k 4.2V GND 80µ Vcc 9 8 CUBI 4.1V 1k 147 40k Vcc 11k 9 (8) 40k 40k –3– Sound multiplexing signal input. Typical input level = 70mVrms (monaural, 100%) 2k 4.2V Bias capacitor connection of Cue pulse generator. CXA2020M/S Pin No. SOP SDIP 11 9 Symbol Pin voltage Equivalent circuit Description 11 (9) LEDST 12 (10) 10.5k 13 12 10 LEDSU Mode indicator LED connection. Pin 11 (9): stereo Pin 12 (10): sub Pin 13 (11): main 10.5k (11) — 64k 10.5k 16k 64k 16k 64k 13 11 LEDM 16k GND Vcc 20µ 16 12 MODE — 20k 16k 16 4.2V (12) 40k DC voltage-based output mode switch for bilingual broadcasts. 10.5k GND 17 (13) 17 13 MUTE 70k Output muting. When High, only DC is output from Pins 19, 20 and 21 (15, 16 and 17). — 50k 10.5k GND GND 18 (14) 18 14 FOMO Forced monaural. When High, forced monaural (main sound) mode is selected and the LED turns off. 70k — 50k 10.5k GND GND Vcc Vcc 147 Main signal output. Always outputs the main signal component, regardless of the broadcast mode. 17.2k 19 15 MOUT 4.1V 19 32k (15) 1.5m 32k GND –4– CXA2020M/S Pin No. SOP SDIP Symbol Pin voltage Equivalent circuit Description Vcc Vcc 147 17.2k 20 16 ROUT 20 4.1V R-ch output. 32k (16) 1.5m 32k GND Vcc Vcc 147 L-ch output. During "TEST", the Cue signal component passed through the Cue BPF is output. 17.2k 21 17 LOUT 21 4.1V 32k (17) 1.5m 32k GND Vcc Vcc Vcc 147 22 18 MCIN 4.1V 147 20P 23 (19) DC cut capacitor connection of main signal. 147 147 22 23 19 MCOUT 3.4V 16k (18) 160µ 4.2V 80µ 80µ Vcc Vcc 25 20 SCIN 4.1V GND 147 26 (21) 8k Vcc 20P 320µ 40k 147 25 (20) 26 21 SCOUT 147 3.9V 16k 4.2V 4.2V 80µ 80µ 22 SUBI 80µ 64k 4.1V 16k 1k 8k 8k 28 (22) 147 4.2V –5– GND Vcc 20µ Vcc 16k 28 DC cut capacitor connection of sub signal. 1.7V 147 Bias capacitor connection of sub FM detector. "TEST" mode, used for filter adjustment, is activated by grounding this pin. CXA2020M/S Electrical Characteristics Measurement Circuit (CXA2020M) SW1 C10 10µF NORM (OFF) TEST (ON) SW4 CCIR FILTER SW2 MAIN OUT SW6 R OUT OFF L OUT ON 15kHz LPF RMS DISTORTION DCVOLT SW3 E2 C10 1µF C9 1µF MEASUREMENT SYSTEM E3 E4 GND GND GND 28 27 26 25 24 23 22 21 20 19 18 17 16 15 9 10 11 12 13 14 3 4 5 6 7 E5 A C3 10µF C1 10µF C4 10µF GND C2 47µF SIGNAL 8 SIG R2 910 R3 910 MAIN 2 SUB 1 STEREO CXA2020M R4 910 E1 9V ATT GND SW5 ∗ ATT is set to bring L → R stereo separation to a minimum. –6– CXA2020M/S Electrical Characteristics (Ta = 25°C, VCC = 9V) SW No. Item The pin numbers in parentheses are for the CXA2020S. Bias Symbol condi- condi- Conditions tions tions 1 2 3 4 5 6 7 8 Current consumption Sub output level 400Hz Sub frequency characteristics 1kHz Sub frequency characteristics 10kHz Sub distortion Sub S/N ratio Stereo distortion L-ch Stereo distortion R-ch ICC Vs1 Fs1 Fs2 Ds Ns Dstl Dstr 1 4 4 4 4 4 4 4 Measurement point Min. Typ. Max. Unit mA Measure current input to Pin 4 Pin 4 17 25 36 2 and 3 Input signal: SIG1 Measure output amplitude (400Hz, sine wave) of Pins 20 and 21 (16 and 17): Vs1 (15kLPF) Pins 20 and 21 (16 and 17) ∗1 480 580 690 mVrms 2 and 3 Input signal: SIG2 Measure output amplitude (1kHz, sine wave) of Pins 20 and 21 (16 and 17): Vs2 Vs2 Fs1 = 20log Vs1 (15kLPF) Pins 20 and 21 (16 and 17) ∗1 –1.6 –0.6 2 and 3 Input signal: SIG3 Measure output amplitude (10kHz, sine wave) of Pins 20 and 21 (16 and 17): Vs3 Vs3 Fs2 = 20log Vs1 (15kLPF) Pins 20 and 21 (16 and 17) ∗1 –19.0 –16.5 –14.0 2 and 3 Input signal: SIG2 Measure distortion of output signal (1kHz, sine wave) of Pins 20 and 21 (16 and 17) (15kLPF) Pins 20 and 21 (16 and 17) ∗1 — 1 2 % 2 and 3 Input signal: SIG2 Measure S/N ratio of output (1kHz) of Pins 20 and 21 (16 and 17) (15kLPF, RMS) Pins 20 and 21 (16 and 17) ∗1 59 64 — dB 2 Input signal: SIG4 Measure distortion of output signal (1kHz, sine wave) of Pin 21 (17) (15kLPF) Pin 21 (17) — 0.2 1.5 % 2 Input signal: SIG5 Measure distortion of output signal (1kHz, sine wave) of Pin 20 (16) (15kLPF) Pin 20 (16) — 0.2 1.5 % 1 ∗1 When bias condition is "3", measurement point is Pin 20 only. –7– 0 dB dB CXA2020M/S SW No. Item Bias Measurement point Min. Typ. Max. 2 Input signal: SIG4 Measure output amplitude (1kHz, sine wave) of Pin 21 (17) (15kLPF) Pin 21 (17) 440 540 640 mVrms 2 Input signal: SIG5 Measure output amplitude (1kHz, sine wave) of Pin 20 (16) (15kLPF) Pin 20 (16) 440 540 640 mVrms 2 Input signal: SIG6 Measure output signal (400Hz, sine wave) of Pin 19 (15) (15kLPF) Pin 19 (15) 480 580 690 mVrms 2 Input signal: SIG6 Measure amplitude of output signal (400Hz, sine wave) of Pins 20 and 21 (16 and 17) (15kLPF) Pins 20 and 21 (16 and 17) 480 580 690 mVrms 2 Input signal: SIG7 Measure output amplitude (1kHz, sine wave) of Pins 20 and 21 (16 and 17): Vm3 Vm3 Fm1 = 20log Vm2 (15kLPF) Pins 20 and 21 (16 and 17) –1.6 –0.6 2 Input signal: SIG8 Measure output amplitude (10kHz, sine wave) of Pins 20 and 21 (16 and 17): Vm4 Vm4 Fm2 = 20log Vm2 (15kLPF) Pins 20 and 21 –16.0 –14.0 –12.0 (16 and 17) dB 2 Input signal: SIG7 Measure distortion of output signal (1kHz, sine wave) of Pin 19 (15) (15kLPF) Pin 19 (15) % Symbol condi- condi- Conditions tions tions 9 Stereo output level L-ch 1kHz 10 Stereo output level R-ch 1kHz 11 Main output level MAIN OUT 12 13 14 15 Main output level Main frequency characteristics 1kHz Main frequency characteristics 10kHz Vstl Vstr Vm1 Vm2 Fm1 Fm2 Main distortion Dm1 MAIN OUT 4 4 4 4 4 4 4 –8– — 0.2 0 1 Unit dB CXA2020M/S SW No. Item Bias Conditions Measurement point Min. Typ. Max. Unit 2 Input signal: SIG7 Measure distortion of output signal (1kHz, sine wave) of Pins 20 and 21 (16 and 17) (15kLPF) Pins 20 and 21 (16 and 17) — 0.2 1 % 2 Input signal: SIG9 Measure distortion of output signal (1kHz, sine wave) of Pins 20 and 21 (16 and 17) (15kLPF) Pins 20 and 21 (16 and 17) — 0.3 2 % 2 Input signal: SIG7 Measure S/N ratio of output signal (1kHz) of Pins 20 and 21 (16 and 17) (15kLPF. RMS) Pins 20 and 21 (16 and 17) 65 73 — dB Pins 20 and 21 (16 and 17) 35 45 — dB Pins 20 and 21 (16 and 17) 35 45 — dB Pins 20 and 21 (16 and 17) 55 58 — dB Symbol condi- condi- tions tions 16 17 18 Main distortion Dm2 Main distortion at maximum Dm3 input Main S/N ratio Nm 4 4 4 Input signal: SIG4 Sstr = 19 Stereo separation L→R Sstr 4 2 Output amplitude Pin 21 (17) 20log Output amplitude Pin 20 (16) (dB) (15kLPF) Input signal: SIG5 Sstl = 20 Stereo separation R→L Sstl 4 2 Output amplitude Pin 20 (16) 20log Output amplitude Pin 21 (17) (dB) (15kLPF) 21 Cross talk MAIN → SUB Cms1 2 2 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) –9– CXA2020M/S SW No. Item Bias Measurement point Min. Typ. Max. Unit Pins 20 and 21 (16 and 17) 60 70 — dB Pins 20 and 21 (16 and 17) 55 58 — dB Pins 20 and 21 (16 and 17) 60 70 — dB 2 Input signal: SIG11 Measure subcarrier component amplitude of the output of Pins 20 and 21 (16 and 17). Pins 20 and 21 (16 and 17) — 10 30 mVrms 1 Input signal: SIG11 Measure the subcarrier component amplitude of the output of Pins 20 and 21 (16 and 17). Pins 20 and 21 (16 and 17) — 12 20 mVrms 4 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) Pins 20 and 21 (16 and 17) 70 80 — dB Symbol condi- condi- Conditions tions tions 22 Cross talk SUB → MAIN Csm1 2 1 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) 23 Cross talk MAIN → SUB BOTH mode Cms2 2 3 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). Vms3 (dB) Vms2 (15kLPF, 1kBPF) Cms2 = 20log 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). Vsm3 (dB) Vsm2 (15kLPF, 1kBPF) Csm2 = 20log 25 Residual carrier SUB 26 Residual carrier MAIN 27 Mute volume MAIN Lcs Lcm Mm 3 3 4 – 10 – CXA2020M/S SW No. Item Bias Conditions Measurement point Min. Typ. Max. Unit 4 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) Pins 20 and 21 (16 and 17) 70 80 — dB 4 2 and 4 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) Pins 20 and 21 (16 and 17) ∗2 70 80 — dB 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. — 20 100 mV 3 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. — 20 100 mV 3 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. — 20 100 mV 2 Input signal: SIG12 Change SIG12 and measure amount of attenuation at the point "monaural" switches to "Sound multiplex". — 9 14 17 dB 2 Input signal: SIG13 Change SIG13 and measure amount of attenuation at the point "monaural" switches to "Sound multiplex". — 10 13 18 dB Symbol condi- condi- tions tions 28 29 30 31 32 33 34 Mute volume SUB Mute volume stereo DC offset stereo L-ch DC offset stereo R-ch DC offset MAIN OUT Cue detection sensitivity SUB detection sensitivity Ms Mst Ostl Ostr Om CD SD 4 4 4 ∗2 Measure Pin 21 for SIG4 input; Pin 20 for SIG5 input. – 11 – CXA2020M/S SW No. Item Bias Symbol condi- condi- Measurement point Conditions tions tions Cue BPF gain 35 CG 4.5fH trap attenuation level 36 5 TG 6 Typ. Max. 620 mVrms 2 Input signal: SIG14 Pin 21 Measure the output (17) amplitude of Pin 21 (17). 330 480 2 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) 20 38 SW Condition Table SW Min. — Unit dB BIAS Condition Table BIAS 1 2 3 4 5 6 1 off off off off off off 1 9V 0.5V 0.5V 0.5V 0.5V 2 off on off off off off 2 9V 4.5V 0.5V 0.5V 0.5V 3 off off on off off off 3 9V 2.5V 0.5V 0.5V 0.5V 4 on off off off off off 4 9V 4.5V 4.5V 0.5V 0.5V 5 off off on on on off 6 off off on off on on NO NO – 12 – E1 E2 E3 E4 E5 CXA2020M/S Input Signal Definition SIG1 : Sound MPX signal Main : 0% Sub : 400Hz, 100% MOD Cue : Bilingual SIG10 : Sound MPX signal L-ch : 1kHz, 100% R-ch : 0% Cue : Cue signal off SIG2 : Sound MPX signal Main : 0% Sub : 1kHz, 100% MOD Cue : Bilingual SIG11 : Sound MPX signal Main : 0% Sub : 0% (Carrier only) Cue : Bilingual SIG3 : Sound MPX signal Main : 0% Sub : 10kHz, 100% MOD Cue : Bilingual SIG12 : Sound MPX signal Main : 0% Sub : 0% (Carrier only) Cue : Bilingual (level adjusted to minimum) SIG4 : Sound MPX signal L-ch : 1kHz, 100% R-ch : 0% Cue : Stereo SIG13 : Sound MPX signal Main : 0% Sub : 0% (level adjusted to minimum) Cue : Bilingual SIG5 : Sound MPX signal L-ch : 0% R-ch : 1kHz, 100% Cue : Stereo SIG14 : 55.069kHz 5.6mVrms 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 sine wave SIG15 : Sound MPX signal Main : 1kHz, 100% Sub : 0% (Carrier only) Cue : Bilingual SIG16 : 31.47kHz 42mVrms sine wave SIG17 : 70.80kHz 42mVrms 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 MODE SW Forced Forced monaural MUTE Broadcast SUB BOTH MAIN MODE monaural condition Stereo L R MAIN STEREO SUB MAIN × × × OFF OFF L R L+R ON OFF OFF × × × × ON OFF L+R L+R L+R OFF OFF OFF × × × × × ON DC DC DC OFF OFF OFF F.MONO × OFF SUB SUB MAIN OFF ON OFF F.MONO × OFF MAIN SUB MAIN OFF ON ON F.MONO × OFF MAIN MAIN MAIN OFF OFF ON F.MAIN OFF OFF SUB SUB MAIN OFF ON OFF F.MAIN OFF OFF MAIN SUB MAIN OFF ON ON ON F.MAIN OFF OFF MAIN MAIN MAIN OFF OFF ON ON ON Monaural LED On/Off condition × ON Bilingual Output condition ON ON × × × F.MAIN ON OFF MAIN MAIN MAIN OFF OFF OFF × × × × × ON DC DC DC OFF OFF OFF × × × × × OFF MONO MONO MONO OFF OFF OFF × × × × × ON OFF OFF OFF DC DC DC ×: No response Control Voltage Range The information in parentheses is for the CXA2020S. Voltage range SUB 4.5V to VCC BOTH 2V to 3V(or open) MAIN 0V to 0.5V Forced monaural Pin 18 (Pin 14) on 3V to VCC off 0V to 0.5V (or open) MUTE Pin 17 (Pin 13) on 3V to VCC off 0V to 0.5V (or open) MODE SW Pin 16 (Pin12) Forced monaural mode F.MAIN Pin 6 (Pin 5) F.MONO 3V to VCC 0V to 0.5V (or open) 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 Oscilloscope Application circuit AC Voltmeter R L MPX IN CH1 CH2 VR2 L. OUT R. OUT 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 28 27 26 24 25 SW3 21 22 23 19 20 SUB R5 2.4k BOTH ON MAIN ON C7 C6 C5 10µF 10µF 10µF C8 1µF OFF C9 1µF R6 2.4k OFF NORM (OFF) TEST (ON) SW4 R OUT L OUT C10 10µF MAIN OUT Application Circuit CXA2020M SW1 SW2 18 17 16 15 13 14 R7 3.6k CXA2020M C2 47µF C3 10µF MPX IN 12 11 C4 10µF SW5∗ R2 910 R3 910 R4 910 70mVrms (MONO 100%) VR2 1k GND 10 MAIN F. MAIN C1 10µF 9 8 7 SUB 6 5 4 3 STEREO 2 F. MONO 1 Vcc 9V ∗SW5: F. MONO- Forced monaural mode operates only for stereo. F. MAIN- Forced monaural mode operates for both stereo and bilingual. 22 21 20 19 18 C7 10µF 17 16 ON OFF ON C6 10µF C8 1µF R6 2.4k OFF NORM (OFF) C9 1µF TEST (ON) SW4 MAIN OUT C10 10µF R OUT L OUT CXA2020S MAIN R5 2.4k BOTH SUB SW1 C5 SW3 SW2 10µF 13 12 15 14 R7 3.6k CXA2020S C2 47µF GND SW5∗ VR2 1k 70mVrms (MONO 100%) 9 C4 10µF 10 11 MAIN C3 10µF 8 SUB 7 STEREO F. MONO C1 10µF 6 5 4 3 F. MAIN 2 MPX IN 1 R2 910 R3 910 R4 910 Vcc 9V ∗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 – CXA2020M/S Example of Representative Characteristics SUB BPF frequency characteristics Output level [dB] Output level [dB] De-emphasis characteristics 0 0 –20 –5 –10 –40 Main –15 –60 Sub 100 1k 10 10k 20 30 40 50 60 70 80 90 100 Frequency [Hz] Frequency [kHz] Cue BPF frequency characteristics MAIN distortion characteristics 2 Distortion [%] Attenuation level [dB] 3 0 –20 1 –40 –60 3.5fH –40k 3.5fH –20k 3.5fH 3.5fH +20k 100 3.5fH +40k 200 300 400 500 MAIN modulation factor [%] Frequency [Hz] – 17 – CXA2020M/S Package Outline Unit: mm CXA2020M 28PIN SOP (PLASTIC) 375mil + 0.4 18.8 – 0.1 + 0.4 2.3 – 0.15 28 15 + 0.2 0.1 – 0.05 14 1 0.45 ± 0.1 0.5 ± 0.2 9.3 10.3 ± 0.4 + 0.3 7.6 – 0.1 0.15 + 0.1 0.2 – 0.05 1.27 ± 0.12 M PACKAGE STRUCTURE PACKAGE MATERIAL EPOXY / PHENOL RESIN SONY CODE SOP-28P-L04 LEAD TREATMENT SOLDER PLATING EIAJ CODE ∗SOP028-P-0375-D LEAD MATERIAL 42 ALLOY PACKAGE WEIGHT 0.7g JEDEC CODE CXA2020S + 0.1 0.05 0.25 – 22PIN SDIP (PLASTIC) + 0.4 19.2 – 0.1 7.62 + 0.3 6.4 – 0.1 12 22 0° to 15° 11 1 0.5 ± 0.1 + 0.15 0.9 – 0.1 + 0.4 3.9 – 0.1 + 0.15 3.25 – 0.2 0.51 MIN 1.778 PACKAGE STRUCTURE MOLDING COMPOUND EPOXY RESIN SONY CODE SDIP-22P-01 LEAD TREATMENT SOLDER PLATING EIAJ CODE SDIP022-P-0300 LEAD MATERIAL COPPER ALLOY PACKAGE WEIGHT 0.95g JEDEC CODE – 18 –