CXA1580Q Dolby B Type Noise Reduction System with Playback Equalizer For the availability of this product, please contact the sales office. Description 40 pin QFP (Plastic) The CXA1580Q is an IC designed for use in car stereos. Functions include Dolby B type noise reduction, playback equalizer and interval detection between tracks (MUSIC SENSOR) into a single chip. Features • Few external parts • Forward/Reverse head switching • 3-input selector switch (TAPE, CD, RADIO) • Small package (40-pin QFP) • Dolby B type noise reduction and playback equalizer into a single chip • Same pin configuration as Dolby B/C type noise reduction system (CXA1581) • Interval detection level between tracks can be set by external resistors/capacitors (2 modes). Absolute Maximum Ratings (Ta=25°C) • Supply voltage Vcc 12 • Operating temperature Topr –40 to +85 • Storage temperature Tstg –65 to +150 • Allowable power dissipation PD 430 V °C °C mW Recommended Operating Condition Supply voltage Vcc 6.5 to 11 V Applications • Car stereos • Stereo cassette deck players (playback only) Structure Bipolar silicon monolithic IC * “Dolby” and the double D symbols are trademarks of Dolby Laboratories Licensing Corporation. 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— E93503-TE CXD1580Q 30 29 28 27 26 25 24 INSW TC1 NC1 LINEOUT1 VCT CDIN1 RADIOIN1 TAPEIN1 GND PBOUT1 Block Diagram and Pin Configuration 23 21 22 20 31 RADIO/CD PBTC1 PBFIN2 19 300k 17 16 MODE MS NR 10dB DRSW NRSW MSSW MODESW LPF 13 300k 38 PBRIN2 18 32 33 34 DR TAPESW 15 E IREF TA PE 14 PBGND A UX 35 PBFIN1 IN 300k 36 PBRIN1 TAPE/AUX 37 PBFB1 AUXSW G1 (FF) G2 (NOR) 12 39 PBFB2 300k G1/G2 DET 40 11 TAPE/AUX RADIO/CD —2— 9 MSGND 10 TC2 8 NC2 7 LINEOUT2 6 D IREF 5 CDIN2 4 RADIOIN2 3 TAPEIN2 2 VCC 1 PBOUT2 PBTC2 MSTC MSOUT CXD1580Q Pin Description Pin No. Symbol (Ta=25°C, Vcc=8.0V, no signal) DC I/O value resistance Equivalent circuit Description 1 30 32 39 33 34 37 38 2 PBOUT 2.8V — PBEQ output PBFB 1.4V 150kΩ PBEQ feedback PBIN 0V 70kΩ PBEQ input Vcc 8.0V — Power supply 10 29 35 31 40 GND MSGND PBGND PBTC 0.0V — Ground — — Refer to Page 6. Vcc PBEQ capacitance 147 31 40 42µ 30µ GND 36 E IREF 1.25V — Vcc 147 Connection of reference current setting resistor for PBEQ block. 1.25V 36 10µ GND 11 MSOUT 0.0V for — VDD=5V Vcc signal detection; 5.0V for no signal 147 11 10k detection GND —3— MS output CXD1580Q Pin No. 12 Symbol MSTC DC I/O value resistance Approx. — Equivalent circuit Description VDD Vcc 1.4V for signal Connection of MS detection time constant 50µ 147 12 detection; 1k 5.0V for no signal detection GND 13 14 G2(NOR) G1(FF) 4.0V — Vcc MS feedback 10µ 147 100k 13 14 100µ GND 3 28 TAPEIN 4.0V 40kΩ TAPE input Vcc 3 15µ 28 4 27 147 RADIOIN 27 5 26 CDIN 6 D IREF RADIO input 4 40k to VGS 5 CD input 26 1.25V GND — Vcc 147 8k Connection of reference current setting resistor for Dolby block 1.25V 6 50µ GND 7 24 LINEOUT 4.0V — Vcc 147 200 7 24 200 GND —4— Line output CXD1580Q Pin No. 9 22 Symbol TC DC I/O value resistance 0.3V Equivalent circuit — Description Vcc Connection of Dolby detection capacitor X2 0.5µ 6µ 0.5µ 20k 9 147 22 600k GND 15 17 18 19 20 21 MODESW NRSW DRSW TAPESW AUXSW INSW — — Refer to Page 6. Vcc 15 50µ 17 147 18 19 20 GND 21 16 MSSW — — Refer to Page 6. Vcc 50µ 50µ 147 16 GND 25 VCT 4.0V — Vcc/2 output Vcc 30k 50µ 45k 25 147 to VGS 30k 8 23 NC — — GND No connection. —5— CXD1580Q * PBOUT, PBFB, PBIN equivalent circuit Vcc VREG 1k OUT 147 300k 1k FB 147 IN 147 300k 70k GND * Description for SW pins MODESW - Switching of MS signal detection/blank detection High: G1 (signal detection); Low: G2 (blank detection) NRSW Switching of Dolby B type noise reduction ON/OFF High: noise reduction OFF; Low: Dolby B DRSW Switching of tape rotation High: reverse; Low: forward TAPESW - Switching of HIGH/NORMAL tape High: NORMAL tape; Low: HIGH tape AUXSW - Switching of CD/RADIO in the AUX mode High: CD; Low: RADIO INSW Switching of TAPE/AUX High: TAPE; Low: AUX MSSW Switching of MS ON/OFF High: MS ON; Low: MS OFF —6— CXD1580Q Electrical Characteristics (Ta=25°C, Vcc=8.0V, RL: output load resistance, Rg: head equivalent impedance) Item Current consumption Symbol Measurement conditions* (input pin, input level, frequency etc.) Icc No signal Min. Typ. Max. Unit 9.0 12.4 16.0 –32.0 –30.0 –28.0 dBm mA Dolby block (Dolby level -6dBm=0dB) TAPEIN input sensitivity VTIN LINEOUT= 0 dB 1kHz RADIOIN input sensitivity VRIN LINEOUT= 0 dB 1kHz CDIN input sensitivity VCIN LINEOUT= 0 dB 1kHz Decode boost 1 BP1 TAPEIN 500Hz NR-ON Vlo=–25dB 1.4 2.9 4.4 Decode boost 2 BP2 TAPEIN 2kHz NR-ON Vlo=–25dB 5.5 6.4 8.5 Decode boost 3 BP3 TAPEIN 5kHz NR-ON Vlo=–25dB 3.9 5.2 6.9 Decode boost 4 BP4 TAPEIN 10kHz NR-ON Vlo=–40dB 9.7 10.4 11.9 Decode boost 5 BP5 TAPEIN 10kHz NR-ON Vlo=0dB –1.1 0.4 1.9 TAPEIN total harmonic distortion 1 THD1 TAPEIN –20dBm 1kHz RL=2.7kΩ — 0.02 0.2 % TAPEIN total harmonic distortion 2 THD2 TAPEIN –20dBm 1kHz NRON RL=2.7kΩ RADIOIN total harmonic distortion THD3 RADIOIN –20dBm 1kHz RL=2.7kΩ CDIN total harmonic distortion THD4 CDIN –20dBm 1kHz RL=2.7kΩ Decode S/N ratio SN1 No signal NR ON CCIR/ARM filter 77.0 82.8 dB Signal handling VOMAX1 1kHz THD=1% RL=2.7kΩ 13.0 14.4 — — Cross talk TAPEIN→CDIN CT1 TAPEIN –24dBm 1kHz –65 dB CT2 RADIOIN –24dBm 1kHz –86 –60 Cross talk TAPEIN 1ch→2ch CT3 TAPEIN –24dBm 1kHz — — — –87 Cross talk RADIOIN→CDIN –67 –55 LINEOUT offset voltage Vos1 No signal 3.9 4.0 4.1 120µs FWD frequency characteristics PBREF PBFIN 315Hz –70dBm VPBO=0dB –27.0 –25.0 120µs FWD frequency characteristics F120F –1.5 0.0 1.5 dB dB V Playback equalizer amplifier block PBFIN 2.7kHz –58.5dBm for 315Hz –23.0 dBm dB 70µs FWD frequency characteristics F70F PBFIN 4.5kHz –53.8dBm for 315Hz 120µs RVS frequency characteristics F120R PBRIN 315Hz –70dBm for 315Hz –1.0 0.0 1.0 Signal handling VOMAX2 PBFIN 1kHz THD=1% RL=2.7kΩ –10.0 —3.0 — dBm Total harmonic distortion THD5 PBFIN 1kHz –52dBm RL=2.7kΩ — 0.07 0.5 % S/N ratio SN2 No signal "A" weighting filter 55.0 58.0 — dB Output offset voltage Vos2 No signal Rg=2.2kΩ 2.4 Cross talk between channels CT4 TAPEIN 1kHz –42dBm Cross talk between RVS and FWD CT5 2.8 3.2 V –78 –70 dB –75 –65 — — — — –35 — — dBm –55 0.0 1.0 µA 0.0 1.0 V — — 1.0 V Vcc V Interval detection between tracks (MUSIC SENSOR) block Signal detection level 1 VMS1 TAPEIN 5kHz AMS ON (G1 mode) Signal detection level 2 VMS2 TAPEIN 5kHz AMS ON (G2 mode) MS output leak current IOH TAPEIN 5kHz -10dBm, 5V applied to AMSOUT MS output saturation voltage VOL TAPEIN 5kHz -30dBm, 1mA applied to AMSOUT Logic voltage VIL AUXSW, MODESW, INSW, MSSW, 0.0 VIH TAPESW, NRSW, DRSW 2.5 *120µs, FWD mode, NR OFF, MS OFF unless otherwise specified. —7— CXD1580Q Description of Operation Operation mode control (INSW, AUXSW, TAPESW, DRSW, NRSW, MSSW, MODESW) The CXA1580Q has built in electronic switch circuits and the operations are controlled by the direct current applied to each SW pin. The operation mode state for each switch is shown in the table below. SW INSW AUXSW TAPESW DRSW NRSW MSSW MODESW Function for Low input Function for High input AUX (CD/RADIO) IN RADIO 70µS PB FWD DOLBY B NR MS OFF G2(NOR) MODE TAPE IN CD 120µs PB RVS NR OFF MS ON G1(FF) MODE Click noise can be reduced by the external CR time constant circuit for NR SW switching. —8— DC Ammeter Vcc Power Supply A R1 1.2k GND R3 S4 S3 R9 4.7µ C3 R8 2.2k C4 4.7µ 2.2k 4.7µ C5 2.2k C6 4.7µ 19.2k R7 2.2k 19.2k R4 S1 R10 R5 S2 19.2k 19.2k R6 R14 R13 C2 C1 R12 R11 1.2k R2 2.7k 33µ 270 C8 C7 15k R15 S6 29 26 25 7 23 22 AUXSW 21 1 PBTC2 PBFB2 PBRIN2 PBFIN2 E IREF PBGND PBFIN1 3 5 6 8 9 10 MSOUT MSTC G2(NOR) G1(FF) MODESW MSSW NRSW DRSW CXA1580Q 24 PBRIN1 4 27 S13 TAPESW 2 28 INSW PBFB1 PBTC1 31 32 33 34 35 36 37 38 Audio SG C9 10n 10n 30 PBOUT2 10µ C11 10µ R16 39 R17 Vcc C12 S8 5.1k 1µ S10 C14 5.1k RADIOIN2 S12 1µ C16 R18 R20 138.5k R22 100k R24 D IREF 18k C19 CDIN2 1µ R28 R26 5.1k 100k 270 33µ TAPEIN1 TAPEIN2 R30 R29 2.7k RADIOIN1 C10 1µ PBOUT1 R19 5.1k S7 GND C13 R21138.5k R23 5.1k S9 1µ C15 100k R25 S11 1µ C17 100k R27 5.1k 1µ C18 CDIN1 C29 10µ VCT 22µ LINEOUT1 LINEOUT2 2.2µ C21 0.1µ 2.7k S14 S5 0.1µ 40 TC1 C22 2.7k 0.1µ NC1 NC2 C24 0.1µ C23 TC2 MSGND 20 19 18 17 16 14 R32 1k 10k R31 S15 13 12 11 V1 V2 V3 V4 V5 V6 V7 0.1µ R33 1 5 C25 —9— C26 1.5µ C27 0.015µ 1MEG 10k 100 R40 S22 S23 S24 S25 10k 10k 100 100 R37 R34 S21 S20 R36 R35 100 10K R38 R39 S17 S18 100 S19 S16 10k R43 R42 R41 DIN Audio "A" WTG Oscillo -scope Distortion Analyzer AC Voltmeter CCIR S32 S31 S30 S29 S28 OFF : 0dB ON : 30dB GND 1kHz BPF R44 GND Amp 0dB or 30dB DC Voltmeter 50k S26 Electrical Characteristics Measurement Circuit CXD1580Q R3 1k 10n PBTC2 PBFB2 PBRIN2 PBFIN2 E IREF PBGND PBFIN1 C3 15k R5 PBFB1 PBTC1 PBRIN1 10n C4 2 300k 300k 300k 300k 29 C7 0.22µ 1 30 TAPEIN1 3 28 C8 10dB 10dB NR NR DR DR TAPE TAPE AUX AUX 5 6 RADIO/CD RADIO/CD TAPE/AUX TAPE/AUX 4 25 RADIO/CD 26 TAPE/AUX TAPE/AUX 27 0.22µ 7 LPF LPF 24 8 MS MS IN IN 23 9 DET DET 22 10 G1/G2 G1/G2 MODE MODE MSSW 21 NRSW DRSW H : CD, L : RADIO H : OFF, L : DOLBY B R9 MSTC G2 G1 (H : G1, L : G2) C19 MSOUT 1k 1.5µ L : SIGNAL EXIST H : NO SIGNAL 10k 0.015µ C18 R10 MSSW H : MSON, L : MSOFF MODESW 22k H : RVS, L : FWD R11 H : 120µs, L : 70µs TAPESW AUXSW H : TAPE, L : AUX 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. RVS2 FWD2 FWD1 REV1 1k C2 C1 PB HEAD R4 16µ 16µ 31 32 33 34 35 36 37 38 39 40 PBOUT1 PBOUT2 GND 300k 300k 300k 300k 8V TC1 0.22µ Vcc C5 10µ INSW 10µ LINEOUT1 C13 D IREF 18k C14 LINEOUT2 RADIOIN1 C9 TAPEIN2 0.22µ C10 CDIN1 C12 VCT RADIOIN2 0.22µ C11 0.22µ CDIN2 R6 2.2µ NC1 2.2µ C15 NC2 C16 0.1µ TC2 0.1µ 20 19 18 17 16 15 14 C20 C17 13 12 11 22µ 0.1µ R8 C6 MSGND 1MEG R7 —10— 100k Application Circuit VDD TO MICROCOMPUTER CXD1580Q CXD1580Q (1) Signal route PBFB PBTC Dolby level (–30dBm) PBOUT TAPEIN CDIN RADIOIN (–6dBm) LINEOUT Op 2 Op 1 4dB 20dB TAPE AUX 20dB PBIN F R Fig. 1 Op1 and Op2 are operational amplifiers. Op1 compose the playback equalizer by attaching a resistor and a capacitor to PBFB pin, and a capacitor to PBTC pin. Op2 is an input selector and a LINEOUT amplifier. The gain of LINEOUT amplifier is 24 dB. Reference input level for Dolby is -30 dBm. The adjustment method of playback equalizer is described in the paragraph (3). (2) Level diagram P B I N 0dBm –5 –10 –15 –20 –25 –30 –35 –40 –45 –50 –55 –60 –65 –70 –75 P B O U T T A P E I N C D I N R A D I O I N L I N E O U T –6dBm Dolby level –30dBm –30dBm (400Hz 217nWb/m) Dolby level VR adjustment –70dBm (315Hz 160n/Wb/m) —11— –30dBm –30dBm CXD1580Q (3) Adjustment of playback equalizer R1 C2 2 C1 3 PBFB 3 PBTC Ri G1 PBOUT 1 G2 R3 G3 2 fc Fig. 4 PBIN F R E IREF 1 R4 Fig. 3 1) Adjustment of EQ curve gain difference (= adjustment of internal variable R) → E IREF resistor The internal variable resistor Ri should be adjusted to adjust the EQ curve gain differences (G1-G2), (G1G3). Therefore, adjust the external resistor R4 for E IREF pin. 2) AC gain adjustment → External resistor R1 The external resistor R1 should be adjusted to adjust the AC gain. G1, G2 and G3 are obtained by the following equations. G1=20log R1+R3 R1 G2=G3=20log R1+Ri R1 [AC gain can be also adjusted by attaching VR to PBOUT pin, fixing R1. However, the low-band cut-off frequency can be more lowered by R1 adjustment method with the same C1 value used for this method.] 3) Low-band cut-off frequency → External resistor R1 and external capacitor C1 The low-band cut-off frequency (fc) can be determined by the external resistor R1 and external capacitor C1. —12— CXD1580Q (4) MS (interval detection between tracks) adjustment method 2 NOR (BS) G1 G2 1 1 FF (AMS) 2 MSTC 25kHz LPF TAPEIN 10dB MSOUT DET Ri G1 2 G2 1 1 R1 C1 R2 C2 2 Fig. 5 1) MS gain (G1/G2 mode gain) adjustment → External resistors R1, R2 MS gain is expressed by the following equations. G1=10+20log R1+Ri R1 (dB) G2=10+20log R2+Ri R2 (dB) 2) MS cut-off frequency adjustment → External resistors R1, R2 and external capacitors C1, C2 The external resistors R1, R2 and external capacitors C1, C2 should be adjusted to adjust the low-band cutoff frequency of MS frequency characteristics. —13— CXD1580Q Characteristics Graphs Current consump tion vs. Sup p ly voltage Playb ack equalizer frequency characteristics Ta=25˚C Ta=25˚C V cc=8.0V NR OFF, MS OFF Outp ut level 25dBm constant G ain [dB ] 60 12.5 50 40 120µs 30 70µs 12.0 50 100 1k 10k Frequency [Hz] OUT 300k 11.5 0.01µ 7.0 8.0 9.0 10.0 11.0 33µ 12.0 270 Sup p ly voltage [V] Decode b oost frequency characteristics Ta=25˚C 10 Decode b oost [dB ] Current consump tion [mA] For no signal NR OFF, MS OFF –40dB V cc=8.0V 0dB=Dolb y Level 8 –30dB 6 4 –20dB 2 –10dB 0 0dB 100 1k Frequency [Hz] —14— 10k CXD1580Q Total harmonic distortion (Dolb y b lock) Total harmonic distortion (p re-amp lifier b lock) Ta=25˚C Ta=25˚C Inp ut : PB FIN1 O utp ut : PB O UT1 Vcc=8.0V 101 100 Inp ut : TAPEIN1 O utp ut : LINEO UT1 Vcc=8.0V 0dB =Dolb y Level Distortion [%] 100 f=1kHz ON f=100Hz OFF f= 1kHz 10–1 ON f=10kHz f=100Hz 10–1 OFF f=1kHz 10–2 –24 –20 –16 –12 –8 –4 0 –6 –2 O utp ut level [dB m] 6 10 14 Rip p le elimination ratio (LINEO UT) Ta=25˚C 0 2 O utp ut level [dB m] Rip p le elimination ratio (PB O UT) Ta=25˚C 0 V cc=8.0V R L=2.7kΩ V cc=8.0V –10 –10 Rip p le elimination ratio [dB ] Rip p le elimination ratio [dB ] Distortion [%] f=10kHz –20 –30 –40 –50 –20 –30 NR OFF –40 NR ON –50 –60 –60 –70 –70 100 1k 10k Frequency [Hz] 100 1k Frequency [Hz] —15— 10k CXD1580Q Cross talk b etween channels (1ch → 2ch) –20 V cc=8.0V Inp ut : PBFIN1 Outp ut : LINEOUT1 –30 Cross talk [dB ] Ta=25˚C –40 –50 –60 –70 20 100 1k 10k Frequency [Hz] B lank detection level frequency characteristics V cc=8.0V Ta=25˚C Inp ut : TA PEIN1 –10 –20 –30 HPF gain 20dB –40 –50 HPF gain 40dB –60 20 100 1k 10k Frequency [Hz] Ta=25˚C MS b lock gain vs. B lank detection level V cc=8.0V Ta=25˚C Inp ut : TA PEIN1 f=1kHz –30 Inp ut level [dB m] Inp ut level [dB m] Ta=25˚C –40 –50 –60 –70 10 20 30 40 HPF gain [dB ] —16— 50 60 CXD1580Q Package Outline Unit : mm 40PIN QFP (PLASTIC) + 0.35 1.5 – 0.15 + 0.1 0.127 – 0.05 9.0 ± 0.4 + 0.4 7.0 – 0.1 0.1 21 30 20 31 A 11 40 1 + 0.15 0.3 – 0.1 0.65 10 ± 0.12 M 0.5 ± 0.2 (8.0) + 0.15 0.1 – 0.1 DETAIL A PACKAGE STRUCTURE PACKAGE MATERIAL EPOXY RESIN SONY CODE QFP-40P-L01 LEAD TREATMENT SOLDER / PALLADIUM PLATING EIAJ CODE ∗QFP040-P-0707 LEAD MATERIAL COPPER / 42 ALLOY PACKAGE WEIGHT 0.2g JEDEC CODE —17—