CXA2020M

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 = 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 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 = 25°C, 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 80µ 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 20µ 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. 160µ 23 19 MCOUT 3.4V (18) 16k 4.2V 80µ 80µ GND Vcc Vcc 25 20 SCIN 4.1V 147 26 (21) Vcc 40k 147 25 (20) 147 16k 4.2V 4.2V 80µ 80µ GND 320µ 20P 8k DC cut capacitor connection of sub signal. 26 21 SCOUT 3.9V 80µ 20µ 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 1µF C10 1µF R OUT L OUT C10 10µF 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 10µF GND C4 10µF R2 910 R3 910 R4 910 C2 47µF E1 9V SIGNAL GND SIG ATT ∗ ATT is set to bring L → R stereo separation to a minimum. SW5 –6– MAIN SUB C3 10µF STEREO A CXA2020M/S Electrical Characteristics (Ta = 25°C, 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 L→R 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 R→L 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 × Stereo × × ON ON ON Bilingual ON ON ON × × Monaural × × × × × × × × × × × × × × × × × × × F.MONO F.MONO F.MONO F.MAIN F.MAIN F.MAIN F.MAIN × × × OFF ON × × × × OFF OFF OFF ON × × × 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 ×: 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 10µF TEST (ON) SW4 28 NORM (OFF) C9 1µF R6 2.4k R5 2.4k BOTH ON C8 1µF 25 24 23 ON MAIN OFF OFF C7 C6 C5 10µF 10µF 10µF 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 10µF C4 10µF SW5∗ 70mVrms (MONO 100%) R2 910 R3 910 MAIN R4 910 Vcc 9V R5 2.4k BOTH SUB SW1 R7 3.6k C2 47µF 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 10µF TEST (ON) SW4 22 NORM (OFF) C9 1µF C8 1µF R6 2.4k OFF ON C6 10µF C7 10µF 17 16 OFF ON MAIN 21 20 19 18 C5 SW3 SW2 10µF 13 12 15 14 CXA2020S 1 2 3 4 5 6 7 8 9 10 11 F. MONO C1 10µF F. MAIN C4 10µF SW5∗ R2 910 70mVrms (MONO 100%) R3 910 R4 910 Vcc 9V C2 47µF 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 10µF STEREO SUB C3 10µF 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°