CXA2547Q 2-band Electronic Volume For the availability of this product, please contact the sales office. Description The CXA2547Q is a 2-channel electronic volume IC. A 34-bit serial data input controls the level and characteristics of the output signal. It may be used in car stereos and general audio systems. Features • Loudness • Volume control (from 0 dB to –80 dB, –∞ dB : Fine (1 dB-step) Coarse (8 dB-step) • Balance • Tone control (2-band, 2 dB-step from –15 dB to +15 dB) • Fader 2 dB-step to –20 dB, –25 dB, –35 dB, –45 dB, –60 dB, –∞ dB) • Input and gain selector (4 channels) • Serial data control (DATA, CLK, CE) • Single 8 V power supply • Zero-cross detection circuit (L/R independent operation for the volume block) • Timer • Power-off mute • Countermeasure to the noise of the portable telephone 48 pin QFP (Plastic) Absolute Maximum Ratings (Ta=25 °C) • Supply voltage VCC 13 V • Operating temperature Topr –40 to +85 °C • Storage temperature Tstg –65 to +150 °C • Allowable power dissipation PD 350 mW (Ta=85 °C) Recommended Operating Conditions Supply voltage VCC 7 to 12 V Structure Bipolar silicon monolithic IC 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— E97Y19B91-TE CXA2547Q GAIN134 LDLC1 LDHC1 INAO1 VRIN1 TCHC1 NC NC TCLC11 TCLC12 TCO1 FDIN1 Block Diagram and Pin Configuration 36 35 34 33 32 31 30 29 28 27 26 25 GAIN12 37 24 FNTO1 LOUD VOLUME 2dB STEP GAIN11 38 INPUT SWITCH IN14 39 IN13 40 IN12 41 VOLUME 1dB STEP TONE FADER VCTBUFF 22 CE VCTBUFF 21 CLK VCTBUFF 20 DGND ZCDET VOL LATCH CONTROL LATCH IN11 42 ZCDET 19 GND SHIFT REGISTER INPUT SWITCH IN21 43 IN22 44 IN23 45 IN24 46 18 VCC VCTBUFF 17 VCT ZCDET VCTBUFF VOL 16 DATA VCTBUFF 15 TIMER VOLUME 2dB STEP GAIN21 47 VOLUME 1dB STEP TONE FADER LOUD LOUD 14 REO2 1 2 3 4 5 6 7 8 9 10 11 12 LDLC2 LDHC2 INAO2 VRIN2 TCHC2 NC NC TCLC21 TCLC22 TCO2 FDIN2 13 FNTO2 GAIN234 GAIN22 48 23 REO1 —2— CXA2547Q Pin Description Pin No. Symbol I/O resistance Pin voltage Equivalent circuit Description VCC 2 35 LDLC2 LDLC1 1.08 k VCT Sets loudness low cut-off frequency. 2 35 GND VCC 3 34 LDHC2 LDHC1 24.05 k VCT Set loudness high cut-off frequency 3 34 GND VCC 4 33 INAO2 INAO1 — VCT 4 Input selector output 33 GND VCC 5 32 VRIN2 VRIN1 10 k VCT 5 Volume input 32 GND VCC 6 31 TCHC2 TCHC1 5k VCT 6 Set tone Treble frequency 31 GND —3— CXA2547Q Pin No. 7 30 8 29 Symbol I/O resistance Pin voltage NC — NC — Equivalent circuit Description VCC 9 28 TCLC21 TCLC11 8k VCT 9 Sets tone Bass frequency 28 GND VCC 10 27 TCLC22 TCLC12 8k VCT 10 Sets tone Bass frequency 27 GND VCC 11 26 TCO2 TCO1 — VCT 11 Tone control output 26 GND —4— CXA2547Q Pin No. Symbol I/O resistance Pin voltage Equivalent circuit Description VCC 12 25 FDIN2 FDIN1 24 k VCT 12 Fader input 25 GND VCC 13 24 REO2 REO1 — VCT 13 Rear output 24 GND VCC 14 23 FNT02 FNT01 — VCT 14 Front output 23 GND VCC 15 TIMER ~∞ 15 Timer constant setting — GND VCC 16 DATA ~∞ 124 4k 16 Serial data input — GND —5— CXA2547Q Pin No. Symbol 17 VCT 18 VCC 19 GND 20 DGND I/O resistance Pin voltage — VCT — VCC — Gnd — — Equivalent circuit Description 1/2 VCC Power supply input Ground Digital ground VCC 21 CLK ~∞ 124 4k 21 Serial clock input — GND VCC 20k 22 CE ~ 20k 22 124 4k Latch enable input Take care to set the low level as the input impedance is low. — GND VCC 1 36 37 38 47 48 GAIN234 GAIN134 GAIN12 GAIN11 GAIN21 GAIN22 1 ~∞ VCT 36 External gain setting for input amplifier 37 38 47 48 GND 39 40 41 42 43 44 45 46 IN14 IN13 IN12 IN11 IN21 IN22 IN23 IN24 VCC 50 k VCT 39 40 41 42 Signal input 43 44 45 46 GND —6— CXA2547Q Data Format First Bit Last Bit D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 D16 D17 D18 D19 D20 D21 D22 D23 D24 D25 D26 D27 D28 D29 D30 D31 D32 D33 D34 D35 D36 NOP NOP ISW LOUD VRC1 VRF1 VRC2 VRF2 TONE BASS NOP TONE TREBLE FADER FADER SELECT —7— CXA2547Q ISW Mode IN14/IN24, GAIN134/GAIN234 IN13/IN23, GAIN134/GAIN234 IN12/IN22, GAIN12/GAIN22 IN11/IN21, GAIN11/GAIN21 D3 1 1 0 0 D4 1 0 1 0 LOUD Mode ON OFF D5 1 0 VRC1/VRC2 Output (dB) 0 –2 –4 –6 –8 –10 –12 –14 –16 –18 –20 –22 –24 –26 –28 –30 –32 –34 –36 –38 –40 –42 –44 –46 –48 –50 –52 –54 –56 –58 –60 –62 –64 –66 –68 –70 –72 –74 –76 –78 –80 –∞ D6/D13 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 D7/D14 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 D8/D15 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0 1 0 —8— D9/D16 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 — — D10/D17 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 — — D11/D18 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 — — — — — — — — — — CXA2547Q VRF1/VRF2 Output (dB) 0 –1 D12/D19 1 0 BASS/TREBLE Output (dB) 15 12 10 8 6 4 2 0 D20/D28 1 1 1 1 0 0 0 0 D21/D29 1 1 0 0 1 1 0 0 D22/D30 1 0 1 0 1 0 1 0 D33 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 D34 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 BOOST/CUT Mode BOOST CUT D23/D31 1 0 FADER Output (dB) –∞ –60 –45 –30 –25 –20 –18 –16 –14 –12 –10 –8 –6 –4 –2 0 D32 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 —9— D35 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 CXA2547Q FADER SELECT Mode FRONT REAR D36 1 0 RESET Reset is performed automatically when power is first supplied to the IC; there is no reset pin. The following table shows the respective statuses of various settings after a reset has been performed. Mode INPUT VRC1 VRF1 VRC2 VRF2 LOUD TONE BASS TONE MID TONE TREBLE FADER Set value 1 – ∞ dB –1 dB – ∞ dB –1 dB OFF 0 dB 0 dB 0 dB 0 dB, REAR ∗ Set all the transfer data to “0” for D24, D25, D26 and D27. —10— CXA2547Q Timing Chart CE DATA D1 D2 D34 D35 D36 Invalid D1 D2 CLK t1 tck t1 ≥ 0.5µs t2 ≥ 0.5µs tck ≥ 1.0µs tsu ≥ 0.5µs th ≥ 0.5µs tsu th t2 tL ≥ tT +0.5µs (tT is the maximum value for the timer operation time) tL D1 for the next data transfer to the CXA2547 is shifted at this clock rise. CE tce tce ≥ 4.0µs Timer Waiting Period Setting Chart (VCC=7 to 12 V, operating temperature=–40 °C to 85 °C) TIMER pin capacitance C C=100 pF C=0.001 µF C=0.01 µF C=0.1 µF C=1 µF C=10 µF Waiting period Min. Typ. Max. 3 µs 5 µs 9 µs 30 µs 50 µs 90 µs 300 µs 500 µs 900 µs 3 ms 5 ms 9 ms 30 ms 50 ms 90 ms 300 ms 500 ms 900 ms —11— CXA2547Q Electrical Characteristics VCC=8 V, Ta=25 °C, input=0 dB unless otherwise specified Item Current consumption Total harmonic distortion Output noise voltage Max. output voltage Separation Max. attenuation factor Loudness LOW boost Loudness HIGH boost Max. Bass boost gain Max. Bass cut gain Max. Treble boost gain Max. Treble cut gain Input voltage HIGH Input voltage LOW Input voltage range Symbol ICC THD Vn Vom CS ATTm Glb Glh Gbb Gbc Gtb Gtc Vsh Vsl Vin Conditions No signal 1 kHz, 5 dBm output Short-circuit at input, A weight 1 kHz 1 kHz 100 Hz, VRC=–32 dB 10 kHz, VRC=–32 dB DATA, CLK, CE DATA, CLK, CE IN11 to 14 The IC is not IN21 to 24 destroyed or VRIN1, 2 does not operate FDIN1, 2 abnormally. —12— Min. — — — 8 72 85 13 5 13 13 13 13 3 0 1 Typ. 25 0.004 8 — 90 90 15 6 15 15 15 15 — — — Max. 35 0.01 10 — — — 17 7 17 17 17 17 6 1.5 VCC–1 Unit mA % µVrms dBm dB V A B S12 A IN24 48 1 3 2 47 GAIN21 46 45 IN23 44 IN22 43 IN21 42 IN11 IN12 C5 5 4 6 8 7 9 C13 10 C17 10µ V6 A B AC 12 11 REO2 TIMER DATA VCT VCC GND DGND 40 IN13 41 CLK 10k R7 10k C20 R14 0.01µ B S3 A R8 S4 10k FNTO2 13 14 15 16 17 18 19 20 21 CE 22 10µ FNTO1 R13 24 10k R12 REO1 23 10k 25 B V4 AC 39 IN14 10µ 26 27 28 C18 A 10µ 29 10µ C14 30 B 31 38 GAIN11 37 GAIN22 A B S24 A B S23 A B S22 A B S21 A B S11 A B S13 AC B S14 GAIN12 V14 AC V12 V13 AC AC AC V11 V21 32 R5 GAIN234 10k C1 AC 33 LDLC2 0.22µ C3 V22 34 LDHC2 AC 35 INAO2 V23 36 VRIN2 V24 10k A NC AC R1 10µ C7 0.0027µ NC R2 10k R4 10k R3 GAIN134 C15 10k LDLC1 R5 LDHC1 10k C2 0.22µ INAO1 820P VRIN1 C8 0.0027µ TCHC1 TCHC2 NC TCLC21 NC C4 820P C6 0.39µ TCLC11 S2 C15 TCLC22 TCLC12 0.39µ C19 TCO1 TCO2 100µ 1k R18 AC -60dBm V5 R15 R15 R17 10k 10k 10k VCC 3.5~ 6V VEE 3.5~6V FDIN1 FDIN2 V3 V2 1k S5_A S5_B —13— V1 S1 R19 Electrical Characteristics Measurement Circuit DATA CLK CE 220p R20 1k C21 OPAMP 5V 0V 5V 0V 5V 0V CXA2547Q 22k 2.2k GAIN22 48 2 3 10µ C5 5 4 6 8 7 9 C13 10µ 10 17 16 15 14 VCT DATA TIMER REO2 C17 12 11 10µ 18 VCC R7 R8 10k 10k C20 0.01µ FNTO2 13 19 GND 20 21 22 FNTO1 R13 24 10k R12 23 10k 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. 1 GAIN234 GAIN21 LDLC2 47 46 IN24 45 IN23 44 IN22 43 IN21 IN11 DGND 41 IN12 C1 42 CLK REO1 40 IN13 INAO2 CE VRIN2 39 IN14 38 GAIN11 NC GAIN12 37 25 26 27 28 29 30 31 32 33 34 10µ C18 35 10µ C14 36 10µ C6 C7 0.0027µ NC INPUT SIGNAL SOURCES 2.2k GAIN134 0.22µ C3 LDLC1 C2 0.22µ C4 820P LDHC1 LDHC2 INAO1 820P VRIN1 C8 0.0027µ TCHC1 TCHC2 NC TCLC21 NC C15 22k C15 TCLC11 0.39µ TCLC12 TCLC22 TCO1 0.39µ C19 FDIN1 TCO2 —14— FDIN2 33µ Application Circuit TO POWER SUPPLY TO CPU OUTPUT SIGNAL CXA2547Q 10µ C21 CXA2547Q Description of Operation (1) Input amplifier gain 36 GAIN134 37 GAIN12 38 GAIN11 Rext 33 VCT INAO1 Rint 39 IN14 Rint is included in this IC, (22kΩ) 40 IN13 41 IN12 Rint Rext Gain=1+ 42 IN11 No Rext → 0 dB (2) LOUD The loudness function achieves the necessary frequency response by using a filter as shown below. The resistors are built in this IC so that fL and fH can be set by selecting C1 and C2. fL=1/ (2πC1R1) fH=1/ (2πC2R2) 3 LDHC1 4 LDHC2 R2=24.05k C2 38.8k fH 13.02k 32 VRIN1 5 VRIN2 R1=1.08k VCT CXA2547Q 3 LDLC1 C1 5 LDLC2 VCT —15— fL CXA2547Q (3) Tone control BASS : LPF fL=1/ (2πC1R1//R2) R1=8k fL 8k R2=8k 8k VCT CXA2547Q VCT 27 TCLC12 C1 18 TCLC22 VCT TREBLE : HPF fH=1/ (2πC4R5) 10k 10k VCT 10k 10k R5=5k CXA2547Q C4 3 TCHC11 1 TCHC21 VCT —16— fH CXA2547Q (4) Zero-cross detector and timer A built-in zero-cross detection circuit is used to detect the zero-cross points of the input signal. When data arrived at the IC, they are executed at the next zero-cross point or when there is no input signal. This is to minimize 'click' noise during the transition of levels. The timer circuit is added to ensure that the data is executed even when a zero-cross point is not detected after a certain period of time from the falling edge of the CE pulse. Time constant=(0.5/10µ) × C [s] VCC 10µA 0.5V CE 15 CXA2547Q TIMER C (5) VCT pin The internal circuit of VCT pin has the following structure. Insert a buffer when using the pin as a reference voltage for an external circuit. VCC 100k VCT 17 100k CXA2574Q GND (6) Power-off mute When VCC goes below 5 V, the output stage bias of the fader output pins FNTO1, FNTO2, REO1, and REO2 is turned off and the pins go to high impedance. This operation prevents popping noises caused by the output pin potential deviating from VCC/2 when the power is turned off. —17— CXA2547Q Example of Representative Characteristics Tone control frequency response 20 16 +15 12 4 0 –4 –8 –12 –15 –16 –20 10 100 1k 10k 100k Frequency (Hz) Loudness frequency response 10 VRC=0dB 0 Voltage (dB) Voltage (dB) 8 –10 VRC=–10dB VRC=–20dB –20 VRC=–30dB –30 VRC=–40dB –40 1 10 100 Frequency (Hz) —18— 1k 10k 100k CXA2547Q Package Outline Unit : mm 48PIN QFP (PLASTIC) 15.3 ± 0.4 + 0.1 0.15 – 0.05 + 0.4 12.0 – 0.1 0.15 36 25 24 13.5 37 48 + 0.2 0.1 – 0.1 13 12 0.8 + 0.15 0.3 – 0.1 0.24 M 0.9 ± 0.2 1 + 0.35 2.2 – 0.15 PACKAGE STRUCTURE SONY CODE QFP-48P-L04 EIAJ CODE QFP048-P-1212 JEDEC CODE PACKAGE MATERIAL EPOXY RESIN LEAD TREATMENT SOLDER / PALLADIUM PLATING LEAD MATERIAL 42/COPPER ALLOY PACKAGE MASS 0.7g NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame). —19—