CXA2506Q Electronic Volume For the availability of this product, please contact the sales office. Description The CXA2506Q 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 (Full boost at –32 dB or less of VRC) • Volume control (from 0 dB to –87 dB, –∞ dB: Fine (1 dB-step) Coarse (8 dB-step) • Balance • Tone control (3-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 • Timer • Power-off mute 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 Condition • Supply voltage VCC 6 to 12 V Structure Bipolar 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— E96X02B7Y CXA2506Q LDLC1 LDHC1 INAO1 VRIN1 TCHC1 TCMC11 TCMC12 TCLC11 TCLC12 TCO1 FDIN1 36 35 34 33 32 31 30 29 28 27 26 25 37 GAIN11 38 IN14 39 IN13 40 IN12 41 IN11 42 24 FNTO1 LOUD 8dB STEP 1dB STEP V OLUME V OLUME V OLUME 8dB STEP V OLUME 1dB STEP 15 TIMER TONE FA DER LOUD 14 REO2 1 2 3 4 5 6 7 8 9 10 11 12 TCO2 FDIN2 13 FNTO2 TCLC22 48 V CTBUFF TCLC21 GAIN22 16 DATA TCMC22 47 V CTBUFF TCMC21 GAIN21 17 VCT TCHC2 46 V CTBUFF VRIN2 IN24 18 VCC INAO2 45 19 GND LDHC2 IN23 LA TCH CONTROL DLC2 44 20 DGND SHIFT REGISTER INPUT SWITCH IN22 21 CLK V CTBUFF LA TCH 23 REO1 22 CE GAIN234 43 FA DER V CTBUFF ZCDET IN21 TONE V CTBUFF INPUT SWITCH GAIN12 GAIN134 Block Diagram and Pin Configuration —2— CXA2506Q Pin Description and Equivalent Circuit Pin No. Pin Name I/O Resistance Pin voltage Equivalent Circuit Description VCC 2 35 LDLC2 LDLC1 6.18 k VCT Sets loudness low cut-off frequency. 2 35 GND VCC 3 34 LDHC2 LDHC1 8.92 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— CXA2506Q Pin No. Pin Name I/O Resistance Pin voltage Equivalent Circuit Description VCC 7 30 TCMC21 TCMC11 4k VCT 7 Sets tone Mid frequency 30 GND VCC 8 29 TCMC22 TCMC12 4k VCT 8 Sets tone Mid frequency 29 GND 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— CXA2506Q Pin No. Pin Name 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 Sets timer constant GND VCC 16 DATA ~∞ — 16 Serial data input GND —5— CXA2506Q Pin No. Pin Name 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 ~∞ — 21 Serial clock input GND VCC 22 CE ~∞ — 22 Latch enable input GND VCC 1 36 37 38 47 49 39 40 41 42 43 44 45 46 GAIN234 GAIN134 GAIN12 GAIN11 GAIN21 GAIN22 IN14 IN13 IN12 IN11 IN21 IN22 IN23 IN24 1 36 ~∞ VCT External gain setting for input amplifier 37 38 47 48 GND VCC 50 k VCT 39 40 41 42 43 44 45 46 Signal input GND —6— CXA2506Q 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 TONE MID TONE TREBLE FADER FADER SELECT —7— CXA2506Q 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 D8/D15 1 1 0 0 1 1 0 0 1 1 0 0 0 D9/D16 1 0 1 0 1 0 1 0 1 0 1 0 0 LOUD MODE ON OFF D5 1 0 VRC1/VRC2 OUTPUT (dB) 0 –8 –16 –24 –32 –40 –48 –56 –64 –72 –80 –∞ –∞ D6/D13 1 1 1 1 1 1 1 1 0 0 0 0 0 D7/D14 1 1 1 1 0 0 0 0 1 1 1 1 0 —8— CXA2506Q VRF1/VRF2 OUTPUT (dB) 0 –1 –2 –3 –4 –5 –6 –7 D10/D17 1 1 1 1 0 0 0 0 D11/D18 1 1 0 0 1 1 0 0 D12/D19 1 0 1 0 1 0 1 0 D20/D24/D28 1 1 1 1 0 0 0 0 D21/D25/D29 1 1 0 0 1 1 0 0 D22/D26/D30 1 0 1 0 1 0 1 0 BASS/MID/TREBLE OUTPUT (dB) 15 12 10 8 6 4 2 0 BOOST/CUT MODE BOOST CUT D23/D27/D31 1 0 —9— CXA2506Q FADER OUTPUT (dB) –∞ –60 –45 –35 –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 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 D35 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 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. However, from the time when power is first supplied until the first data transfer, keep CE high by pulling it up to VCC, etc. MODE SET VALUE INPUT 1 VRC1 – ∞ dB VRF1 –7 dB VRC2 – ∞ dB VRF2 –7 dB LOUD OFF TONE BASS 0 dB TONE MID 0 dB TONE TREBLE 0 dB FADER 0 dB, REAR —10— CXA2506Q Timing Chart CE DATA D1 D2 D34 D35 D36 Invalid CLK t1 t1 ≥ 0.5µs t2 ≥ 0.5µs tck ≥ 1.0µs tsu ≥ 0.5µs th ≥ 0.5µs tck tsu th t2 tL tL ≥ tT +0.5µs (tT is the maximum value for the timer operation time) CE tce tce ≥ 4.0µs Timer Waiting Period Setting Chart (VCC = 6 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— CXA2506Q 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 Loudness HIGH Bass max. boost gain Bass max. cut gain Mid max. boost gain Mid max. cut gain Treble max. boost gain Treble max. cut gain Input voltage HIGH Input voltage LOW Input voltage range Symbol ICC THD Vn Vom CS ATTm Glb Glh Gbb Gbc Gmb Gmc 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=–16 dB 10 kHz, VRC=–16 dB DATA, CLK, CE DATA, CLK, CE IN11 to 14 IN21 to 24 VRIN1, 2 FDIN1, 2 —12— Min. — — — 8 72 85 7 5 13 13 13 13 13 13 3 0 1 Typ. 21 0.003 8 — 90 90 8 6 15 15 15 15 15 15 — — — Max 28 0.01 10 — — — 9 7 17 17 17 17 17 17 6 1.5 VCC–1 Unit mA % µVrms dBm dB V A B S12 A 3 2 1 47 GAIN21 46 IN24 45 IN23 44 IN22 43 IN21 42 IN11 41 IN12 40 IN13 C5 5 4 10µ 8 7 6 10µ C13 10 9 B V4 AC DATA 12 REO2 C17 A V6 B AC 10k R7 B S3 A R8 3-6V 10k C20 R14 1k 0.01µ R9 S4 10k FNTO2 13 14 15 16 VCT 17 TIMER 10µ 19 VCC 18 GND DGND 20 FNTO1 R13 24 10k R12 REO1 23 10k R11 CE 22 1k R10 CLK 21 1k 25 11 26 27 28 29 30 C18 A 10µ 31 10µ C14 32 B 33 39 IN14 48 A 34 38 GAIN11 37 GAIN22 A B S24 A B S23 A B S22 A B S21 A B S11 A B S13 R2 AC AC AC AC AC AC AC AC V14 B S14 GAIN12 10k V13 V12 V11 35 GAIN234 V21 36 LDLC2 0.15µ C3 V22 R5 R5 10µ INAO2 V23 10k GAIN134 LDHC2 10k C1 VRIN2 10k R4 10k LDLC1 10k C2 LDHC1 0.15µ C4 INAO1 TCLC21 V24 R1 820p 820p VRIN1 C8 TCHC2 C7 TCHC1 0.0027µ C10 TCMC21 0.0027µ C9 TCMC11 0.033µ C12 TCMC22 TCMC12 0.033µ C11 TCLC11 S2 C15 C15 R3 0.022µ 0.022µ C6 0.39µ 0.39µ TCLC12 TCLC22 10k 10k R18 1k AC -60dBm V5 VEE 3-6V TCO1 TCO2 C19 FDIN1 FDIN2 100µ V3 V2 VCC R17 R15 R15 S1 10k R19 S5_A S5_B —13— V1 1k Electrical Characteristic Test Circuit DATA CLK CE 220p R20 1k C21 OPAMP 5V 0V 5V 0V 5V 0V CXA2506Q 10k 48 3 2 GAIN234 1 10µ FNTO1 R13 24 10k R12 REO1 23 10k R11 CE 22 1k R10 CLK 21 1k 25 10µ C18 R5 C5 5 4 8 7 6 C13 10µ 10 9 15 C17 10µ 12 11 R7 R8 10k 10k C20 1k 0.01µ R9 FNTO2 13 REO2 14 TIMER DATA 16 VCT 17 VCC 18 C21 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. 0.15µ C3 GAIN22 LDLC2 47 GAIN21 46 IN24 45 IN23 44 IN22 43 IN21 INAO2 GND 19 VRIN2 42 IN11 TCHC2 C7 DGND 20 TCMC21 0.0027µ C9 41 IN12 40 IN13 39 IN14 38 GAIN11 37 0.033µ C11 GAIN12 26 27 28 29 30 31 32 33 34 10µ C14 35 10µ GAIN134 TCMC22 INPUT SIGNAL SOURCES R1 LDLC1 LDHC2 10k C1 TCLC21 R2 10k R4 10k LDHC1 R5 INAO1 10k C2 VRIN1 0.15µ C4 TCHC1 C8 TCMC11 0.0027µ C10 TCMC12 0.033µ C12 TCLC11 36 820p 820p C15 TCLC12 C15 R3 0.022µ 0.022µ C6 0.39µ 0.39µ TCO1 TCLC22 C19 FDIN1 TCO2 —14— FDIN2 33µ Application Circuit TO POWER SUPPLY TO CPU OUTPUT SIGNAL CXA2506Q 10µ CXA2506Q Example if Representative Characteristics Tone Control Frequency Characteristics 20 15dB Voltage (dB) 10 BASS MID TREBLE 0 –10 –15dB –20 1 10 100 1k 10k 100k Frequency (Hz) Loudness Frequency Characteristics 10 Voltage (dB) 0 VRC=0dB VRC=–8dB –10 VRC=–16dB VRC=–24dB –20 VRC=–32dB –30 –40 1 10 100 1k Frequency (Hz) —15— 10k 100k CXA2506Q Description of Operation (1) Gain of input amplifier The input selector stage may be configured as a buffer or a non-inverting amplifier. Gain=1+R2/R1 R1 R2 36 GAIN134 37 GAIN12 38 GAIN11 VCT CXA2506Q 39 IN14 40 IN13 33 INA01 Input amp of channel 1 41 IN12 42 IN11 (2) Loud The loudness function achieves the necessary frequency characteristics by using a filter as shown below. The resistors are built in so that fL and fH can be set by selecting C1 and C2. fL=1/(2πC1R1) fH=1/(2πC2R2) 34 LDHC1 3 LDHC2 C2 32 VRIN1 5 R2=21.93k 30k fH 3.79k R1=1.84k fL VRIN2 CXA2506Q VCT 35 LDLC1 C1 2 LDLC2 VCT —16— CXA2506Q (3) Tone control BASS: LPF fL=1/(2πC1R1//R2) R1=8k 8k R2=8k fL 8k VCT CXA2506Q VCT 27 TCLC12 C1 18 TCLC22 VCT MID: BPF fL=1/(2πC2R3) fH=1/(2πC3R4) HPF 16k LPF R3=4k 4k fH VCT 16k 4k R4=8k CXA2506Q 29 TCMC12 8 TCMC22 38 TCMC11 C2 C3 VCT fL 7 TCMC21 VCT TREBLE: HPF fH=1/(2πC4R5) 10k 10k VCT 10k 10k R5=5k CXA2506Q 31 TCHC11 C4 6 TCHC21 VCT —17— fH fM CXA2506Q (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 pre-determined period of time from the falling edge of the CE pulse. Time constant=(0.5/10µ) × C [sec] VCC 10µA 0.5V CE 15 CXA2506Q TIMER C (5) VCT pin The internal circuit of VCT pin has the following structure. Insert a buffer when using it as a reference voltage for an external circuit. VCC 100k VCT 17 100k CXA2506Q GND (6) Power-off Mute This function mutes the output pins FNTO1, FNTO2, REO1 and REO2, when the VCC goes below 5V, by turning off the bias of the output stage of the fader circuit. By so doing, the 'pop' noise caused by the drop in these pins potential from VCC/2 during power-off can be avoided. —18— CXA2506Q Package Outline Unit : mm 48PIN QFP (PLASTIC) 15.3 ± 0.4 + 0.1 0.15 – 0.05 + 0.4 12.0 – 0.1 36 25 0.15 24 13.5 37 48 + 0.2 0.1 – 0.1 13 12 0.8 + 0.15 0.3 – 0.1 ± 0.12 M 0.9 ± 0.2 1 + 0.35 2.2 – 0.15 PACKAGE STRUCTURE SONY CODE QFP-48P-L04 EIAJ CODE ∗QFP048-P-1212-B JEDEC CODE PACKAGE MATERIAL EPOXY RESIN LEAD TREATMENT SOLDER / PALLADIUM PLATING LEAD MATERIAL COPPER / 42 ALLOY PACKAGE WEIGHT 0.7g NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame). —19—