CXA1910Q Dolby B Type Noise Reduction System with Playback Equalizer For the availability of this product, please contact the sales office. Description The CXA1910Q is an IC designed for use in car stereos. Functions include Dolby B type noise reduction, playback equalizer amplifier and Music sensor into a single chip. Features • Few external parts • Forward/Reverse head switching • 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 (CXA1911) • Music sense level can be set by external resistors/capacitors (2 modes). • High-band cut filter frequency can be adjusted by the external capacitance. 40 pin QFP (Plastic) Absolute Maximum Ratings (Ta=25°C) • Supply voltage VCC 12 V • Operating temperature Topr –40 to +85 °C • Storage temperature Tstg –65 to +150 °C • Allowable power dissipation PD 430 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 ∗ These ICs are available only to the licensees of Dolby Laboratories Licensing Corporation from whom licensing and applications information may be obtained. ∗ "Dolby" and the double D symbols are trade marks 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— E93Z04-TE CXA1910Q 30 29 28 27 26 25 24 NRSW TC1 NC1 LINEOUT1 VCT NC NC TAPEIN1 GND PBOUT1 Block Diagram and Pin Configuration 23 22 21 31 20 NC PBTC1 19 32 TAPESW NR ON NR OFF NR PBFB1 18 33 DRSW IN 300k NRMODE 17 A UX F/R MSSW 16 TA PE 35 PBFIN1 34 PBRIN1 PBGND 36 MS MODE 15 MSMODE DR PBFIN2 G1 (FF) NR 14 37 E IREF F/R 10dB LPF G2 (NOR) 13 38 300k G1/G2 NR 39 DET PBFB2 NR ON 40 PBTC2 —2— 9 MSGND 10 TC2 NC2 8 LINEOUT2 7 D IREF 6 MSLPF 5 NC 4 TAPEIN2 3 Vcc 2 PBOUT2 1 MSTC MSOUT 11 NR OFF 12 PBRIN2 CXA1910Q Pin Description Pin No. Symbol (Ta=25°C, VCC=8.0V, no signal) DC value Z (in) Equivalent circuit Description 1 30 32 39 33 34 37 38 2 PBOUT 2.1V — Refer to Page 6. PBEQ output PBFB 2.1V 300kΩ PBIN 0V — PBEQ input VCC 8.0V — Power supply 10 29 35 31 40 MSGND GND PBGND PBTC 0.0V — Ground — — PBEQ feedback Vcc PBEQ capacitance 147 31 40 42µ 30µ GND 36 E IREF 1.25V — Vcc 147 Reference current setting resistor pin 1.25V 36 10µ GND 11 MSOUT 0.0V for — VDD=5V Vcc signal detection; 5.0V for no signal 147 11 20k detection GND —3— MS output CXA1910Q Pin No. 12 Symbol MSTC DC value Approx. Z (in) — Equivalent circuit Description VDD=5V 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 40k TAPE input Vcc 15µ 3 28 147 40k to VGS GND 6 D IREF 1.25V Vcc — 147 8k Connection of reference current setting resistor for Dolby block 1.25V 6 50µ GND 7 24 LINEOUT 4.0V — Vcc 7 24 147 200 200 GND —4— Line output CXA1910Q Pin No. 9 22 Symbol TC DC value Z (in) 0.3V — Equivalent circuit Description Vcc ×2 0.5µ 6µ Time Constant pin for the level detector 0.5µ 20k 9 147 22 600k GND 15 17 18 19 21 MSMODE NRMODE DRSW TAPESW NRSW — — Vcc Refer to Page 6. 15 50µ 17 147 18 19 21 GND 16 MSSW — — Vcc 50µ Refer to Page 6. 50µ 147 16 GND 25 VCT 4.0V — Vcc VCC/2 output 30k 50µ 45k 25 147 to VGS 30k 4 8 20 23 26 27 5 NC MSLPF — — 4.0V 100k GND No connection. VCC 100 k 5 147 64p GND —5— Capacitance connection for adjusting the MS LPF time constant. CXA1910Q * PBOUT, PBFB, PBIN equivalent circuit Vcc VREG PBOUT 500 147 1 30 300k 10p PBFB 32 500 39 PBIN 600 33 34 GND 37 38 ∗ Description for SW pins MSMODE - Switching of MS signal detection/blank detection High: G1; Low: G2 NRSW Switching of Dolby B type noise reduction ON/OFF High: noise reduction ON; Low: noise reduction OFF DRSW Switching of tape direction High: reverse; Low: forward TAPESW - Switching of HIGH/NORMAL tape High: NORMAL tape; Low: HIGH tape NRMODE - Switching of noise reduction modes High: noise reduction OFF; Low: Dolby B MSSW Switching of MS ON/OFF High: MS ON; Low: MS OFF —6— CXA1910Q Electrical Characteristics (Ta=25°C, Vcc=8.0V, RL: output load resistance, Rg: head equivalent impedance) Measurement conditions∗ Item Symbol Min. Typ. Max. Unit (input pin, input level, frequency etc.) Current consumption ICC No signal 14.5 17.9 21.5 mA TAPE IN input sensitivity VTIN LINEOUT= 0 dB 1kHz –32.0 –30.0 –28.0 dBm Decode boost 1 BP1 TAPE IN 500Hz NR-ON Vlo=–25dB 1.4 2.9 4.4 Decode boost 2 BP2 TAPE IN 2kHz NR-ON Vlo=–25dB 5.5 6.4 8.5 Decode boost 3 BP3 TAPE IN 5kHz NR-ON Vlo=–25dB 3.9 5.2 6.9 Decode boost 4 BP4 TAPE IN 10kHz NR-ON Vlo=–40dB 9.7 10.4 11.9 Decode boost 5 BP5 TAPE IN 10kHz NR-ON Vlo=0dB –1.1 0.4 1.9 TAPE IN total harmonic distortion 1 THD1 TAPE IN –20dBm 1kHz RL=2.7kΩ — 0.03 0.2 TAPE IN total harmonic distortion 2 THD2 TAPE IN –20dBm 1kHz NR-ON RL=2.7kΩ — 0.04 0.2 Decode S/N ratio SN1 No signal NR-ON CCIR/ARM filter 77.0 82.8 — Signal handling VOMAX1 1kHz THD=1% RL=2.7kΩ 13.0 14.4 — Cross talk TAPE 1ch→2ch CT3 TAPE IN –24dBm 1kHz — –67 –55 LINEOUT offset voltage VOS1 No signal 3.9 4.0 4.1 V 120µs FWD frequency characteristics PBREF PB F IN 315Hz –70dBm VPBO=0dB –27.0 –25.0 –23.0 dBm 120µs FWD frequency characteristics F120F PB F IN 2.7kHz –58.5dBm for 315Hz –1.5 0.7 1.5 70µs FWD frequency characteristics F70F PB F IN 4.5kHz –53.8dBm for 315Hz –1.5 0.0 1.5 120µs RVS frequency characteristics F120R PB R IN 315Hz –70dBm for 315Hz –1.0 0.0 1.0 Signal handling VOMAX2 PB F IN 1kHz THD=1% RL=2.7kΩ –10.0 –3.0 — dBm Total harmonic distortion THD5 PB F IN 1kHz –52dBm RL=2.7kΩ — 0.07 0.5 % S/N ratio SN2 No signal "A" weighting filter 57.0 60.0 — dB Output offset voltage VOS2 No signal Rg=2.2kΩ 1.55 1.95 2.35 V Cross talk between channels CT4 PB IN 1kHz –42dBm — –78 –70 Cross talk between RVS and FWD CT5 — –75 –65 Dolby block (Dolby level -6dBm=0dB) dB % dB dB Playback equalizer amplifier block dB dB Interval detection between tracks (MUSIC SENSOR) block Signal detection level 1 VMS1 TAPE IN 5kHz MS-ON G1 (10kΩ, 0.015µF) –43.0 –39.0 –35.0 Signal detection level 2 VMS2 TAPE IN 5kHz MS-ON G2 (1kΩ, 1.5µF) –62.5 –58.5 –54.5 MS output leak current IOH — 0.0 1.0 µA MS output saturation voltage VOL — 0.28 1.0 V mA dBm TAPE IN 5kHz -30dBm, 1mA applied to MSOUT AMS ON (G1 mode) Boost charge circuit block PBFB boost-charge current ICRG No signal, 3.4V applied to VCT and 1.8V to PBFB 1.0 3.0 — Boost charge ON VCT level VCRG1 No signal, VCT level when boost charge ON — — 3.4 Boost charge OFF VCT level VCRG2 No signal, VCT level when boost charge OFF 3.6 — — VIL MSMODE, NRMODE, MSSW, 0.0 — 0.8 VIH TAPESW, NRSW, DRSW 2.5 — Vcc V Logic voltage ∗120µs, FWD mode, NR OFF, MS OFF unless otherwise specified. —7— Vcc DC Ammeter R1 A GND 1.2k 1.2k R2 GND R6 S4 19.2k R3 19.2k S3 S2 S1 R4 19.2k 19.2k R5 2.2k R7 2.2k R8 2.2k R9 2.2k R10 4.7µ C3 15k R15 10n 4.7µ C4 4.7µ 4.7µ C5 C8 R14 R13 C7 R12 C1 R11 270 33µ 2.7k Power Supply 2.7k 33m 270 C13 + C7 S6 30 PBFB1 PBTC1 PBFIN1 PBRIN1 PBGND 35 E IREF 36 PBFIN2 37 PBFB2 PBRIN2 38 39 1 PBTC2 40 Audio SG 10n C10 31 32 33 34 PBOUT1 29 10µ 1µ C9 2 138.5k S7 3 27 CXA1910Q 4 23 24 25 26 + 5 6 7 22 8 0.1µ MSSW NAMODE DRSW TAPESW NC 21 9 10 MSOUT MSTC G2(NOR) G1(FF) MSMODE R23 R24 + 1k 10k 1.5µ 0.015µ C26 C27 V7 V1 V2 V3 V4 V5 S24 100 R26 S25 S23 10 k R27 100 S22 100 10K 100 10K 10 k R28 R29 R32 R33 R34 S16 S19 S18 S17 100 10k R30 S21 R31 S20 R26 GND Oscillo -scope Distortion Analyzer AC Voltmeter CCIR 1kHz BPF DIN Audio "A" WTG GND Amp S32 S31 S30 S29 S28 OFF : 0dB ON : 30dB 0dB or 30dB DC Voltmeter 50k R35 S26 R19 5.1k 28 NC R17 GND + R20 1µ TAPEIN1 C18 MSLPF 0.1µ + S44 C16 D IREF 10k Vcc R16 NC 10µ C20 C19 PBOUT2 10µ C11 2.2µ R21 TAPEIN2 1µ 138.5k S13 2.7k C22 NC 2.2µ R22 LINEOUT2 VCT 0.1µ LINEOUT1 2.7k C24 NC2 TC2 C23 20 19 18 17 16 15 14 13 12 11 C13 C12 S8 5.1k R18 R45 TC1 NRSW MSGND 0.1µ C25 100k + 0.1µ R25 S7 1MEG NC1 S14 + —8— + + + + + + + + S15 + + Electrical Characteristics Measurement Circuit CXA1910Q 1k R3 1k 16µ 15k R5 PBTC2 PBFB2 PBRIN2 PBFIN2 E IREF PBGND PBFIN1 C3 10n PBFB1 PBRIN1 10n PBTC1 C7 0.22µ 1 2 300k 300k 300k 300k 29 GND 25 RADIO/CD 26 4 5 6 RADIO/CD NR OFF NR ON TAPE/AUX NR 10dB 10dB NR NR DR DR TAPE TAPE AUX AUX NR TAPE/AUX NR OFF NR ON 27 3 28 7 LPF LPF 24 8 MS MS ININ 23 9 DET DET 22 10 G1/G2 G1/G2 MODE MODE MSSW 21 R9 MSTC G2 G1 MSOUT (H : G1, L : G2) C19 1k 1.5µ L : SIGNAL EXIST H : NO SIGNAL 10k 0.015µ C18 R10 MSSW H : MSON, L : MSOFF MSMODE H : OFF, L : DOLBY B H : RVS, L : FWD H : 120µs, L : 70µs NRMODE DRSW TAPESW NC 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 and other right due to same. RVS2 FWD2 FWD1 REV1 PB HEAD C2 C1 C4 16µ 31 32 33 34 35 36 37 38 39 40 R4 30 TAPEIN2 PBOUT1 PBOUT2 NC NC 300k 300k 8V VCT C12 10µ LINEOUT1 C13 150P MSLPF R6 D IREF 18k C14 LINEOUT2 TAPEIN1 Vcc C5 10µ NC C20 2.2µ NC1 2.2µ NRSW C15 NC2 TC1 C16 20 19 18 17 16 15 14 0.1µ TC2 0.1µ C17 13 12 11 H : NR ON, L: NR OFF 0.1µ 0.22µ R8 C6 MSGND 1MEG R7 —9— 100k Application Circuit VDD TO MICROCOMPUTER CXA1910Q R3 1k 16µ 15k R5 PBFB1 PBTC1 C3 PBTC2 10n PBFB2 PBRIN2 PBFIN2 E IREF PBGND PBFIN1 PBRIN1 10n 1 C7 0.22µ 2 300k 300k 300k 300k 29 25 RADIO/CD 26 NC 4 5 6 RADIO/CD NR OFF NR ON TAPE/AUX NR 10dB 10dB NR NR DR DR TAPE TAPE AUX AUX NR TAPE/AUX NR OFF NR ON 27 3 28 7 LPF LPF 24 LINEOUT1 C13 8 MS MS ININ 23 9 DET DET 22 10 G1/G2 G1/G2 MODE MODE MSSW 21 R9 MSTC G2 MSOUT 1k 1.5µ L : SIGNAL EXIST H : NO SIGNAL 10k 0.015µ C18 MSSW H : MSON, L : MSOFF MSMODE (H : G1, L : G2) R10 C19 G1 H : OFF, L : DOLBY B H : RVS, L : FWD H : 120µs, L : 70µs NRMODE DRSW TAPESW NC 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 and other right due to same. RVS2 FWD2 FWD1 REV1 1k C2 C1 PB HEAD 16µ 31 32 33 34 35 36 37 38 39 40 C4 8V R4 30 300k PBOUT1 PBOUT2 GND TAPEIN2 300k TAPEIN1 Vcc C5 10µ NC NC C20 2.2µ C20 68n TCL1 D IREF 20k C14 LINEOUT2 2.2µ C21 68n NRSW C12 10µ VCT 150P MSLPF R6 C15 TCH1 TCL2 C16 20 19 18 17 16 15 14 0.1µ TCH2 0.1µ C17 13 12 11 H : NR ON, L: NR OFF 0.1µ 0.22µ R8 C6 MSGND 1MEG R7 —10— 100k Application Circuit VDD TO MICROCOMPUTER CXA1910Q CXA1910Q Operation mode control (INSW, AUXSW, TAPESW, DRSW, NRSW, MSSW, MODESW) The CXA1910Q 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 NRSW TAPESW DRSW NRMODE MSSW MSMODE Function for Low input NR OFF 70µs PB FWD DOLBY B MS OFF G2 (NOR) MODE Function for High input NR ON 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. —11— CXA1910Q Description of Operation (1) Signal route PBFB PBTC Dolby level (–6dBm) LINEOUT (–30dBm) TAPEIN PBOUT Op1 Op2 4dB NR 20dB NR ON NR OFF 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 24dB. Reference input level for Dolby is –30dBm. 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 L I N E O U T –6dBm Dolby level –30dBm –30dBm VR adjustment –70dBm (315Hz 160n/Wb/m) Fig. 2 —12— CXA1910Q (3) Adjustment of playback equalizer R1 C2 C1 3 PBFB PBTC Ri G1 PBOUT 1 G2 300k G3 2 fc Fig. 4 F E IREF PBIN R 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), (G1-G3). 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. G3 are obtained by the following equations. G1=10+20log R1+300k R1 (dB) [AC gain can be also adjusted by attaching VR to PBOUT pin, fixing R1. However, the low-band cutoff 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. —13— CXA1910Q (4) MS (internal detection between tracks) adjustment method 3 2 1 1 G1 G2 2 MSTC 25kHz LPF (in the case of built-in CR only) TAPEIN 10dB MSOUT DET 100kΩ 64pF 100kΩ G1 MSLPF 3 C3 2 G2 1 1 R1 C1 R2 C2 2 Fig. 5 1) MS gain (FF/NOR mode gain) adjustment → External resistors R1 and R2 MS gain is expressed by the following equations. G1 = 10 + 20log R1 + 100k [dB] R1 G2 = 10 + 20log R2 + 100k [dB] R2 2) MS low-band cut-off frequency adjustment → External resistors R1 and R2 and external capacitors C1 and C2 The external resistors R1 and R2 and external capacitors C1 and C2 should be adjusted to adjust the lowband cut-off frequency for the MS frequency response. 3) MS high-band cut-off frequency adjustment → External capacitor C3 The external capacitor C3 should be adjusted to adjust the high-band cut-off frequency for the MS frequency response. (In this case, G1 and G2 have the same cut-off frequency.) —14— CXA1910Q Characteristics Graphs Current consump tion vs. Sup p ly voltage Playb ack equalizer frequency resp onse Ta=25°C 18.0 Ta=25°C VCC=8.0V NR OFF, MS OFF Output level 25dBm constant For no signal NR OFF, MS OFF Gain [dB] 17.5 50 40 120µs 30 70µs 17.0 50 100 1k 10k Frequency [Hz] 16.5 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 Supply voltage [V] OUT 300k 0.01µ 33µ 270 Decode b oost frequency resp onse Ta=25°C 10 –40dB VCC=8.0V 0dB=Dolby Level 8 Decode boost [dB] Current consumption [mA] 60 –30dB 6 4 –20dB 2 –10dB 0 0dB 100 1k Frequency [Hz] —15— 10k CXA1910Q Total harmonic distortion (p re-amp lifier b lock) B typ e total harmonic distortion (Dolb y b lock) Ta=25°C 101 VCC=8.0V Input : PBFIN1 Output : PBOUT1 RL=2.7k Ω Input : TAPEIN1 Output : LINEOUT1 VCC=8.0V 0dB=Dolby Level RL=2.7k Ω Total harmonic distortion [%] f=10kHz 100 f=1kHz 10-1 10-2 10-1 NR B f=1kHz –8 –20 –16 –12 –8 NR B f=10kHz –4 0 0 –4 4 Output level [dB] Output level [dBm] Rip p le rejection ratio (PB O UT) Ta=25°C –10 VCC=8.0V RL=2.7k Ω –20 –30 –40 –50 –60 50 100 1k 500 Frequency [Hz] 10k 5k Rip p le rejection ratio (LINEO UT) Ta=25°C –10 –20 Ripple elimination ratio [dB] –24 NR B f=100kHz NR OFF f=1kHz f=100Hz Ripple elimination ratio [dB] Total harmonic distortion [%] Ta=25°C 100 VCC=8.0V RL=2.7k Ω NR OFF –30 NR B –40 –50 –60 –70 100 500 1k Frequency [Hz] —16— 5k 10k 8 12 14 CXA1910Q Cross talk b etween channels (1ch → 2ch) Ta=25°C –30 VCC=8.0V Input : PBFIN1 Output : LINEOUT2 (LINEOUT1 level constant) NR OFF Cross talk [dB] –40 –50 –60 –70 100 1k 500 Frequency [Hz] 5k 10k B lank detection level frequency resp onse Ta = 25°C 0 Vcc = 8.0 V Input : TAPEIN 1 MSLPF Pin : 120 pF –10 –30 HPF Gain 20 dB –40 –50 HPF Gain 40 dB –60 20 100 1k Frequency [HZ] 10k MS b lock gain vs. B lank detection level Ta=25°C VCC=8.0V Input : TAPEIN1 f=1kHz –30 –40 Input level [dBm] Input level [dBm] –20 –50 –60 –70 10 20 30 40 HPF gain [dB] —17— 50 60 CXA1910Q 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 (8.0) + 0.15 0.1 – 0.1 0.5 ± 0.2 Package Outline 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 —18—