CXA1911Q Dolby B/C Type Noise Reduction System with Playback Equalizer For the availability of this product, please contact the sales office. Description The CXA1911Q is an IC designed for use in car stereo cassette decks. Functions include Dolby B/C 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/C type noise reduction and playback equalizer into a single chip • Same pin configuration as Dolby B type noise reduction system (CXA1910Q) • 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 Conditions • Supply voltage VCC 7.8 to 11 V Applications • Car stereo cassette decks • Cassette decks (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— E93Y13-TE CXA1911Q 29 28 26 25 24 NRSW TCH1 TCL1 LINEOUT1 VCT NC 27 23 22 21 31 20 30 NC TAPEIN1 GND PBOUT1 Block Diagram NC 19 32 PBTC1 PBFB1 TAPESW 33 300k IN PBRIN1 F/R 17 34 18 NR DRSW NRMODE PBFIN1 16 35 TA PE MSSW DR 36 PBFIN2 MODE A MS NR 14 37 E IREF F/R 10dB LPF 13 300k 38 15 PBGND PBRIN2 MSMODE G1 (FF) G2 (NOR) G1/G2 DET 12 39 NR MSTC 40 —2— 9 MSGND 10 TCH2 8 TCL2 7 LINEOUT2 6 D IREF 5 MSLPF 4 NC 3 TAPEIN2 2 Vcc 1 PBOUT2 PBTC2 11 PBFB2 MSOUT CXA1911Q Pin Description 1 30 32 39 33 34 37 38 2 3 28 Symbol DC value Z (in) PBOUT 2.1V — PBFB 2.1V 300kΩ PBIN 0V — VCC TAPEIN 8.0V 4.0V — 40kΩ Equivalent circuit Refer to Page 7. PBEQ output PBEQ feedback PBEQ input Power supply TAPE input 3 147 28 VGS 4 20 26 27 5 NC — — MSLPF 4.0 100kΩ Description 40k Pin No. (Ta=25°C, VCC=8.0V, no signal) 12µA No connection VCC 100k 5 147 64p GND —3— Adjustment of MS LPF frequency CXA1911Q Pin No. Symbol DC value Z (in) 6 D IREF 1.25V — Equivalent circuit Description Connection of reference current setting resistor for Dolby block 6 50k 147 7 LINEOUT 24 4.0V — Line output VCC 147 200 7 200 24 GND TCL 0.3V — Time Constant pin for the LLS 13.5k 8 23 23 TCH 0.3V 147 — Time Constant pin for the HLS 36k 9 22 480k 8 22 10 29 35 MSGND GND PBGND 0.0V 330k 9 147 — Ground —4— CXA1911Q Pin No. Symbol 11 MSOUT DC value 0.2 V Z (in) — Equivalent circuit VDD=5V Description MS output VCC for signal detection; 147 5.0 V for 11 no signal 20k detection GND 12 MSTC Approx. — VDD=5V Vcc 1.4 V for signal Connection of MS detection time constant 50µ 147 12 detection; 1k 5.0 V for no signal detection GND 13 14 G2(NOR) G1(FF) 4.0V — MS feedback VCC 10µ 13 147 100k 14 100µ GND 15 MSMODE 18 — — 15 DRSW 50µ 18 50µ 19 19 TAPESW 21 NRSW 16 MSSW 147 21 MSMODE MS gain selector G1 when high, G2 when low DRSW Head selector Reverse when high, Forwards when low TAPESW Equalizer selector 120µs when high, 70µs when low NRSW — — VCC 50µ 50µ 147 16 GND —5— NR ON/OFF selector MS on/off selector MS on when high, MS off when low CXA1911Q Pin No. Symbol 17 NRMODE DC value Z (in) — — Equivalent circuit Description Noise reduction selector C when high, B when low 50µ 50µ 17 50k 147 2.5V VCT 4.0V — VCC/2 output 30k 25 Q3 to VGS 147 25 30k 45k 31 40 PBTC — — VCC PBEQ capacitance 147 31 40 42µ 30µ GND 36 E IREF 1.25V — VCC 147 1.25V 36 10µ GND —6— Connection of reference current setting resistor for PBEQ block CXA1911Q • PBOUT, PBFB, PBIN equivalent circuit Vcc VREG PBOUT 147 1 30 PBFB 300k 10p 32 39 PBIN 600 33 34 GND 37 38 Electrical Characteristics (Ta=25°C, VCC=8.0 V, RL: output load resistance, Rg: head equivalent impedance; unless otherwise specified, 120 µs, FWD mode, NR OFF, MS OFF) Item Operating voltage Symbol Measurement conditions (input pin, input level frequency etc.) Vopr Min. Typ. Max. Unit 7.8 8.0 11.0 V 21.9 25.5 mA ICC No signal 18.5 TAPE IN input sensitivity VTIN LINE OUT=0dB 1kHz –32.0 –30.0 –28.0 dBm NR B decode boost 1 BP1 500Hz, LINE OUT –25dB, NR B, TAPE IN 1.4 3.4 4.4 NR B decode boost 2 BP2 2kHz, LINE OUT –25dB, NR B, TAPE IN 5.5 6.0 8.5 NR B decode boost 3 BP3 5kHz, LINE OUT –25dB, NR B, TAPE IN 3.9 5.1 6.9 NR B decode boost 4 BP4 10kHz, LINE OUT –40dB, NR B, TAPE IN 9.7 10.2 11.9 NR B decode boost 5 BP5 10kHz, LINE OUT 0dB, NR B, TAPE IN –1.1 0 1.9 NR C decode boost 1 CP1 500Hz, LINE OUT –60dB, NR C, TAPE IN 14.2 16.5 18.2 NR C decode boost 2 CP2 500Hz, LINE OUT –25dB, NR C, TAPE IN 7.2 9.8 11.2 NR C decode boost 3 CP3 2kHz, LINE OUT –60dB, NR C, TAPE IN 18.7 20.9 22.7 NR C decode boost 4 CP4 2kHz, LINE OUT –25dB, NR C, TAPE IN 5.4 7.3 9.4 NR C decode boost 5 CP5 5kHz, LINE OUT –25dB, NR C, TAPE IN 3.5 5.7 7.5 NR C decode boost 6 CP6 10kHz, LINE OUT 0dB NR C, TAPEIN –5.5 –3.9 –1.5 Current consumption Dolby block (Dolby level -6 dBm=0 dB) —7— dB dB CXA1911Q Electrical Characteristics Item Symbol Measurement conditions (input pin, input level frequency etc.) Min. Typ. Max. Unit TAPE IN total harmonic distortion 1 THD1 TAPE IN –20dBm 1kHz R1=2.7k — 0.01 0.2 TAPE IN total harmonic distortion 2 THD2 TAPE IN –20dBm 1kHz NR B R1=2.7k — 0.04 0.2 TAPE IN total harmonic distortion 3 THD3 TAPE IN –20dBm 1kHz NR C R1=2.7k — 0.07 0.3 Decode S/N ratio SN1 No signal NR B CCIR/ARM filter 77.0 84.0 — SN2 No signal NR C CCIR/ARM filter 80.0 82.0 — % dB Signal handling VSH1 TAPE IN 1kHz RL=2.7KΩ THD=1% 13.5 14.4 — Cross talk TAPE IN 1 ch → 2 ch CT3 TAPE IN –24dBm 1kHz — –91 –55 LINE OUT offset voltage VOS1 No signal 3.9 4.0 4.1 V Level at PB IN to LINE OUT, LINE OUT — 70 100 mV B/C Switching noise VBOTU dB Playback equalizer amplifier block 120 µs FWD frequency response 70 µs FWD frequency response PBREF PB F IN 315Hz –70dBm VPBO=0dB –27.0 –25.5 –23.0 dBm F120F PB F IN 2.7 kHz -58.5 dBm for 315 Hz –1.5 –0.8 1.5 F70F PB F IN 4.5 kHz -53.8 dBm for 315 Hz –1.5 –0.0 1.5 PB R IN 315 Hz -70 dBm for 315 Hz –1.0 –0.3 1.0 –10.0 –3.0 — dBm F120R dB dB Signal handling VSH2 PB F IN 1kHz THD=1% RL=2.7kΩ Total harmonic distortion THD6 PB F IN 1kHz –52dBm RL=2.7kΩ — 0.11 0.5 % S/N ratio SN3 No signal "A" weighting filter ON 57.0 61.1 — dB Output offset voltage VOS2 No signal Rg=2.2 kΩ 1.55 1.95 2.35 V Cross talk between channels CT4 — –80.5 –70 Cross talk between RVS and FWD CT5 — –77.7 –65 TAPE IN 1kHz –42dBm Interval detection between tracks (MUSIC SENSOR) block TAPE IN 5 kHz AMS ON (G1 mode) VMS1 Signal detection level 1 External constant 10 kΩ, 0.015 µF Signal detection level 2 VMS2 MS output leak current IOH MS output saturation voltage VOL TAPE IN 5 kHz AMS ON (G2 mode) External constant 1 kΩ, 1.5 µF TAPE IN 5 kHz -10 dBm, 5 V applied to AMSOUT TAPE IN 5 kHz -30 dBm, 1 mA applied to AMSOUT dB –43.0 –39.0 –35.0 dBm –62.5 –58.5 –54.5 — 0.0 1.0 µA — 0.3 1.0 V 0.0 — 0.8 Logic voltage VIL 2-value input VIH NRSW, TAPESW, DRSW, NRMODE, MSSW, MSMODE V 2.5 — VCC 1.0 3.0 — — — 3.4 Boost charge circuit block PBFB boost charge current ICRG Boost charge ON VCT level VCRG1 Boost charge OFF VCT level VCRG2 No signal, 3.4 V applied to VCT and 1.8 V to PBFB No signal, VCT level when boost charge ON No signal, VCT level when boost charge OFF —8— mA V 3.6 — — GND R1 GND DC Ammeter A Vcc Power Supply R2 1.2k 1.2k 19.2k 19.2k 19.2k 19.2k R7 R3 S4 R8 R4 S3 R9 R5 S2 R6 S1 R13 R14 2.7k 2.2k C6 4.7µ 2.2k 4.7µ C3 C4 2.2k 4.7µ 2.2k 4.7µ C5 C2 R12 C1 R11 S6 15k R15 10n 10n 33µ 270 C8 270 C7 33µ 2.7k 31 32 33 34 35 R10 27 26 25 22 NC 1 PBTC2 PBFB2 PBRIN2 PBFIN2 E IREF PBGND PBFIN1 2 3 4 5 8 9 10 MSOUT MSTC G2 G1 MSMODE MSSW NRMODE DRSW 21 PBRIN1 7 23 TAPESW 6 24 NRSW PBFB1 PBTC1 C9 36 G1 PBOUT2 10µ C11 10µ R16 Audio SG 1µ 138.5k 37 28 C16 38 29 20k C19 39 R17 GND C10 1µ PBOUT1 R19 5.1k S7 C13 Vcc 138.5k 1µ TAPEIN1 TAPEIN2 30 NC NC C18 R28 150P S8 C12 5.1k R18 R29 2.2µ 2.7k C21 S14 S5 NC MSLPF C24 C23 68n 40 LINEOUT1 LINEOUT2 10µ VCT D IREF S13 R30 C29 22µ C22 2.7k 68n TCL1 TCL2 0.1µ TCH1 0.1µ TCH2 MSGND 20 19 18 17 16 C27 1k 1.5µ 10k 0.015µ C26 R31 R32 1 5 14 13 S15 R45 C25 100k 12 11 V7 V5 V4 V3 V2 V1 0.1µ R33 —9— 1MEG 10k 100 R40 S22 S23 S24 S25 10k 10k 100 100 R36 R35 R34 S21 S20 R37 100 10K R38 R39 S17 S18 100 R42 R41 S19 S16 10k R43 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 CXA1911Q CXA1911Q Operating modes (TAPESW, DRSW, NRSW, MSSW, MODESW, NRMODE) The CXA1911Q has an NR switch (NRSW), NR mode switch (NRMODE), equalizer switch (TAPESW), head switch (DRSW), MS switch (MSSW), and MS gain switch (MSMODE). The operating modes for each switch are shown in the following table. SW NRSW NRMODE TAPESW DRSW MSSW MSMODE Function for Low input NR OFF DOLBY B 70µS PB FWD MS OFF G2 MODE Function for High input NR (B/C) ON DOLBY C 120µs PB RVS MS ON G1 MODE Click noise can be reduced by the external CR time constant for NRSW switching. —10— CXA1911Q Description of Operation 1. Signal route PBFB PBTC PBOUT Dolby level (–6dBm) LINEOUT TAPEIN Op1 Op2 4dB NR 20dB NR ON NR OFF 20dB PBIN F R Fig. 1 Op1 and Op2 are operational amplifiers. Op1 composes 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 is 24 dB. The Dolby reference level is –6 dBm (LINEOUT). The adjustment method of playback equalizer is described in the paragraph (3). Note) Usually the TAPEIN pin level is adjusted by attenuator connected to PBOUT pin. The capacitance value connected to PBFB can be reduced by adjusting the resistance connected to PBFB to match the PBOUT level. With this method, the capacitance value can be reduced according to the amount that the resistance value is increased even for the same cut-off frequency. (These specifications use the latter method.) —11— CXA1911Q 2. Level diagram P B I N P B O U T T A P E I N L I N E O U T 0dB –5 –10 –15 –6dBm Dolby level –20 –25 –30 –35 –40 –45 –50 –30dBm –30dBm VR adjustment –55 –60 –65 –70 –75 –70dBm (315Hz 160nWb/m) Fig.2 Note) This diagram illustrates the case where the Dolby level is aligned by adjusting the resistance value connected to PBFB. —12— CXA1911Q 3. PBEQ adjustment 3 R1 C2 2 3 3 C1 PBFB PBTC fc PBOUT 1 Ri 2 R3 F PBIN R E IREF 1 R4 1) EQ curve gain difference (=adjustment of internal variable R) → IREF resistor To adjust the EQ curve gain differences (G1 – G2, G1 – G3), the E IREF resistor should be adjusted to change the internal variable resistance value. 2) AC gain → External resistor R1 The external resistor R1 should be adjusted to adjust the AC gain. G1 is obtained by the following equation. G1=20log R1 + R3 (R3 = 300kΩ) R1 3) Low-band cut-off frequency → External resistor R1 and capacitor C1 The low-band cut-off frequency (fc) can be determined by the external resistor R1 and external capacitor C1. Note) In this diagram, C1 and R1 are not connected in series, but are connected to PBFB from between R1 and C2. This is to prevent the sound quality from deteriorating when using an electrolytic capacitor. —13— CXA1911Q 4. MS (internal detection between tracks) adjustment method 3 2 1 G1 G2 1 2 MSTC 25kHz LPF (in the case of built-in only) TAPEIN 10dB MSOUT DET 100kΩ 64pF 100kΩ G1 MSLPF 3 C3 G2 1 2 R1 C1 1 R2 C2 2 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— CXA1911Q Characteristics Graphs Current consump tion vs. Sup p ly voltage Playb ack equalizer frequency resp onse Ta=25°C Ta=25°C 22.0 For no signal NR OFF, MS OFF VCC=8.0V NR OFF, MS OFF Output level 25dBm constant 50 Gain [dB] Current consumption [mA] 60 21.5 40 120µs 30 70µs 21.0 50 100 10k 1k Frequency [Hz] 20.5 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 OUT Supply voltage [V] 300k 0.01µ B typ e decode characteristics 12 33µ –40dB 10 270 VCC=8.0V 0dB=Dolby Level –30dB 6 4 –20dB 2 –10dB 0 0dB 50 100 500 1k Frequency [Hz] 5k 10k C typ e decode characteristics Ta=25°C 24 20 –60dB VCC=8.0V 0dB=Dolby Level –50dB 16 Decode boost [dB] Decode boost [dB] 8 –40dB 12 –30dB 8 –20dB 4 0 –10dB –4 0dB 50 —15— 100 500 1k Frequency [Hz] 5k 10k CXA1911Q Total harmonic distortion (p re-amp lifier b lock) B typ e total harmonic distortion 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 Total harmonic distortion [%] Ta=25°C 100 100 f=1kHz 10-1 10-2 10-1 NR B f=1kHz f=100Hz –8 –24 –20 –16 –12 –8 –4 NR B f=100kHz NR OFF f=1kHz 0 –4 NR B f=10kHz 0 4 8 Output level [dB] 12 14 Output level [dBm] Rip p le rejection ratio (PB O UT) C typ e total harmonic distortion Ta=25°C 101 100 Ripple elimination ratio [dB] Total harmonic distortion [%] Input : TAPEIN1 Output : LINEOUT1 VCC=8.0V 0dB=Dolby Level RL=2.7k Ω NR C f=10kHz Ta=25°C –10 Vcc=8.0V RL=2.7k Ω –20 –30 –40 –50 –60 NR C f=100kHz 50 100 500 1k Frequency [Hz] 10-1 NR C f=1kHz 10-2 –8 –4 0 4 8 12 Output level [dB] —16— 5k 10k CXA1911Q Cross talk b etween channels (1ch → 2ch) Rip p ler rejection ratio (LINEO UT) –10 –30 VCC=8.0V RL=2.7k Ω NR OFF Vcc=8.0V Input : PBFIN1 Output : LINEOUT2 (LINEOUT1 level constant) NR OFF –40 Cross talk [dB] –20 Ripple elimination ratio [dB] Ta=25 °C Ta=25°C –30 NR B –40 NR C –50 –60 –50 –60 –70 100 –70 100 500 1k 5k 1k 500 Frequency [Hz] 5k 10k 10k Frequency [Hz] MS b lock gain vs. B lank detection level B lank detection level frequency resp onse Ta=25°C Ta = 25°C 0 VCC = 8.0 V Input : TAPEIN 1 MSLPF Pin: T120 pF –10 VCC=8.0V Input : TAPEIN1 f=1kHz –30 –40 –30 HPF Gain 20 dB Input level [dBm] Input level [dBm] –20 –40 –50 HPF Gain 40 dB –50 –60 20 100 1k Frequency [HZ] –60 10k –70 10 —17— 20 30 40 HPF gain [dB] 50 60 CXA1911Q 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—