CXA1646Q/CXA1767Q Electronic Volume Description The CXA1646Q/CXA1767Q is a serial control electronic volume IC for car stereos. CXA1646Q 48 pin QFP (Plastic) CXA1767Q 40 pin QFP (Plastic) Features • Loudness • Volume control (1dB-step from 0dB to –87dB, –∞dB) • Balance • Tone control (2dB-step 2 band from –14dB to +14dB) • Fader (2dB-step to –20dB, –25dB, –35dB, –45dB, –60dB, –∞dB) • Input selector (4 channels) • Serial data control (DATA, CLK, CE) • Single 8V power supply • Zero-cross detection circuit Structure Bipolar IC Absolute Maximum Ratings (Ta = 25°C) • Supply voltage VCC 13 • Operating temperature Topr –40 to +85 • Storage temperature Tstg –65 to +150 • Allowable power dissipation PD 350 240 Recommended Operating Condition Supply voltage VCC V °C °C mW (Ta = 85°C, 1646Q) mW (Ta = 85°C, 1767Q) 6 to 12 V 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– E92759D7Y CXA1646Q/CXA1767Q Block Diagram and Pin Configuration NC LDLC1 LDHC1 INAO1 VRIN1 TCHC1 TCLC11 TCLC12 TCO1 FDIN1 FNTO1 NC CXA1646Q 36 35 34 33 32 31 30 29 28 27 26 25 GAIN1 37 24 REO1 LOUD 8dB STEP VOLUME IN14 38 1dB STEP VOLUME FADER TONE 23 CE IN13 39 INPUT SW IN12 40 22 TEST VCTBUFF 21 CLK VCTBUFF 20 GND IN11 41 LATCH LATCH CONTROL 19 NC NC 42 ZCDET 18 NC NC 43 SHIFT REGISTER 17 VCC IN22 45 INPUT SW IN21 44 VCTBUFF 16 VCT VCTBUFF 15 DATA IN23 46 VOLUME 8dB STEP IN24 47 LOUD VOLUME 1dB STEP TONE 14 INIT FADER 13 REO2 1 2 3 4 5 6 7 8 9 10 11 12 NC LDLC2 LDHC2 INAO2 VRIN2 TCHC2 TCLC21 TCLC22 TCO2 FDIN2 FNTO2 NC GAIN2 48 –2– CXA1646Q/CXA1767Q LDLC1 LDHC1 INAO1 VRIN1 TCHC1 TCLC11 TCLC12 TCO1 FDIN1 FNTO1 CXA1767Q 30 29 28 27 26 25 24 23 22 21 GAIN1 31 20 REO1 LOUD 8dB STEP VOLUME IN13 33 1dB STEP VOLUME INPUT SW IN14 32 FADER TONE 19 CE 18 TEST VCTBUFF VCTBUFF IN12 34 17 CLK LATCH LATCH CONTROL IN11 35 16 GND ZCDET IN21 36 15 VCC SHIFT REGISTER 14 VCT IN22 37 INPUT SW IN23 38 VCTBUFF VCTBUFF IN24 39 VOLUME 8dB STEP LOUD 13 DATA 12 INIT VOLUME 1dB STEP TONE FADER 11 REO2 –3– LDHC2 INAO2 VRIN2 TCHC2 6 7 8 9 10 FNTO2 5 FDIN2 4 TCO2 3 TCLC22 2 TCLC21 1 LDLC2 GAIN2 40 CXA1646Q/CXA1767Q Pin Description (Pin No. in the parenthesis is for CXA1767Q.) Pin No. Symbol I/O resistance Pin voltage Equivalent circuit Description Vcc 2 (1) 35 (30) LDLC2 LDLC1 Sets loudness low cut-off frequency. 5.28kΩ VCT GND Vcc 3 (2) 34 (29) LDHC2 LDHC1 Sets loudness high cut-off frequency. 7.97kΩ VCT GND Vcc 4 (3) 33 (28) INAO2 INAO1 — VCT Input selector output GND Vcc 5 (4) 32 (27) VRIN2 VRIN1 50kΩ VCT Volume input GND –4– CXA1646Q/CXA1767Q Pin No. Symbol I/O resistance Pin voltage Equivalent circuit Description Vcc 6 (5) 31 (26) TCHC2 TCHC1 Sets tone high frequency. 5kΩ VCT GND Vcc 7 (6) 30 (25) TCLC21 TCLC11 Sets tone low frequency. 8kΩ VCT GND Vcc 8 (7) 29 (24) TCLC22 TCLC12 Sets tone low frequency. 8kΩ VCT GND Vcc 9 (8) 28 (23) TCO2 TCO1 — VCT Tone control output GND –5– CXA1646Q/CXA1767Q Pin No. Symbol I/O resistance Pin voltage Equivalent circuit Description Vcc 10 (9) 27 (22) FDIN2 FDIN1 24kΩ VCT Fader input GND Vcc 11 (10) 26 (21) FNTO2 FNTO1 — VCT Front output GND Vcc 13 (11) 24 (20) REO2 REO1 — VCT Rear output GND Vcc 14 (12) INIT — — System reset GND –6– CXA1646Q/CXA1767Q Pin No. Symbol I/O resistance Pin voltage Equivalent circuit Description Vcc 15 (13) DATA ~ –∞ — Serial data input GND 16 (14) VCT — VCT 1 VCC 2 17 (15) VCC VCC +power supply 20 (16) GND GND GND Vcc 21 (17) CLK ~ –∞ — Serial clock GND 22 (18) TEST — — Test. Leave open. Vcc 23 (19) CE ~ –∞ — Latch enable GND –7– CXA1646Q/CXA1767Q Pin No. Symbol I/O resistance Pin voltage Equivalent circuit Description Vcc 37 (31) 48 (40) GAIN1 GAIN2 10kΩ VCT Sets input amplifier gain to 6dB by connecting to VCT. 0dB at open. 10kΩ 10kΩ GND Vcc 38 (32) 39 (33) 40 (34) 41 (35) 44 (36) 45 (37) 46 (38) 47 (39) IN14 IN13 IN12 IN11 IN21 IN22 IN23 IN24 50kΩ VCT Signal input GND Reset Reset is performed by lowering the INIT pin below 1V when CLK is High. Reset is disabled when CLK is Low. The following table shows the reset status. Mode INPUT VRC1 VRF1 VRC2 VRF2 LOUD TONE BASS TONE TREBLE FADER Set value 1 –∞ –7dB –∞ –7dB OFF 0dB 0dB 0dB, REAR –8– CXA1646Q/CXA1767Q Data Format (a) Data allocation FAST BIT LAST BIT MSB D1 D2 NOP D3 D4 ISW D5 LOUD D6 D7 D8 D9 VRC1 D10 D11 D12 VRF1 D13 D14 D15 D16 VRC2 D17 D18 D19 VRF2 D20 D21 D22 D23 TONE BASS D24 D25 D26 D27 TONE TREBLE D28 D29 D30 D31 FADER D32 FADER SELECT LSB –9– CXA1646Q/CXA1767Q (b) Set table • NOP Set value D1 D2 — 0 0 Set value D1 D2 IN14/IN24 IN13/IN23 IN12/IN22 IN11/IN21 1 1 0 0 1 0 1 0 • ISW • LOUD Set value ON OFF D5 1 0 • VRC1/VRC2 Set value O –8 –16 –24 –32 –40 –48 –56 –64 –72 –80 –∞ –∞ D6/D13 D7/D14 D8/D15 D9/D16 1 1 1 1 1 1 1 1 0 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 1 1 0 0 1 1 0 0 1 1 0 0 0 1 0 1 0 1 0 1 0 1 0 1 0 0 D10/D17 D11/D18 D12/D19 1 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 • VRF1/VRF2 Set value O –1 –2 –3 –4 –5 –6 –7 – 10 – CXA1646Q/CXA1767Q • TONE BASS/TREBLE Set value D20/D24 D21/D25 D22/D26 1 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 D28 D29 D30 D31 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 1 1 1 0 0 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 1 0 1 0 1 0 1 0 14 12 10 8 6 4 2 0 • BOOST/CUT Set value BOOST CUT D23/D27 1 0 • FADER Set value –∞ –60 –45 –35 –25 –20 –18 –16 –14 –12 –10 –8 –6 –4 –2 0 • FADER SELECT Set value D32 Attenuation of front signal Attenuation of rear signal 1 0 – 11 – CXA1646Q/CXA1767Q • DATA TIMING CE DATA D1 D2 D3 D31 D32 CLK min 0.5µs max 1MHz min 0.5µs CE min 4µs – 12 – CXA1646Q/CXA1767Q Electrical Characteristics Item (VCC = 8V, Ta = 25°C unless otherwise specified) Symbol Conditions Min. Typ. Max. Unit Circuit current ICC No signal — 17 21 mA Total harmonic distortion factor THD 1kHz, 5dBm — 0.005 0.01 % Output noise voltage Vn Shortcircuit at input, Aweight — 7 10 µVrms Maximum output voltage Vom 1kHz 8 — — dBm Separation CS 1kHz 72 90 — dB Maximum attenuation factor ATTm 85 90 — dB Loudness LOW Glb 100Hz, VRC = –16dB 7 8 9 dB HIGH Glh 10kHz, VRC = –16dB 7 8 9 dB Bass max. boost gain Gbb 12 14 16 dB Bass max. cut gain Gbc 12 14 16 dB Treble max. boost gain Gtb 12 14 16 dB Treble max. cut gain Gtc 12 14 16 dB Gain switching Gh GAIN = VCT 5 6 7 dB H Vsh 3 — 6 V L Vsl DATA, INIT CLK, CE 0 — 1.5 V 1 — VCC – 1 V Input voltage Input voltage range Vin IN11 to 14 IN21 to 24 VRIN1, 2 FDIN1, 2 – 13 – AC V24 AC V23 AC V22 AC V21 AC V11 AC V12 AC V13 S25 S24 S23 S22 S21 S11 S12 S13 48 GAIN2 47 IN24 46 IN23 45 IN22 44 IN21 43 NC 42 NC 41 IN11 40 IN12 39 IN13 38 IN14 C21 0.047µ 1 NC AC V14 2 C22 0.0047µ 3 4 C23 7 6 5 C24 CXA1646Q VRIN2 S14 TCHC2 37 GAIN1 TCLC21 – 14 – 8 C25 0.22µ 9 10 C27 11 REO2 13 12 R21 10k INIT 14 DATA 15 VCT 16 VCC 17 NC 18 NC 19 GND 20 CLK 21 TEST 22 CE 23 REO1 24 NC S15 25 26 27 28 29 30 31 32 33 34 35 36 S2 R11 10k NC C14 10µ LDLC1 C13 LDHC1 C11 0.047µ INAO1 LDLC2 VRIN1 C12 0.047µ TCHC1 LDHC2 TCLC11 INAO2 TCLC12 TCLC22 TCO1 TCO2 FDIN1 FDIN2 FNTO1 FNTO2 NC C15 0.22µ C17 10µ R22 10k R6 1k R7 1k R12 V1 V2 V5 V4 AC V5 R5 1k OP AMP C1 0.001µ C2 10µ R1 RV1 R3 1k S1 C1 220p OP AMP DATA CLK CE 0V 5V 0V 5V 0V 5V CXA1646Q/CXA1767Q Electrical Characteristic Test Circuit 35 LDLC1 36 NC GND 20 NC 19 41 IN11 42 NC 6DB 0DB 48 GAIN2 47 IN24 46 IN23 45 IN22 44 IN21 C21 0.047µ 1 NC LDLC2 2 LDHC2 C22 0.0047µ 3 INAO2 C23 10µ 4 C25 C24 10µ 0.0068µ 7 6 5 TCLC22 8 TCO2 FDIN2 10 C27 C26 10µ 0.22µ 9 11 REO2 13 INIT 14 DATA 15 VCT 16 VCC 17 NC 18 CLK 21 40 IN12 VRIN2 43 NC TEST 22 39 IN13 TCHC2 CXA1646Q CE 23 38 IN14 FNTO2 12 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. ON OFF 34 LDHC1 REO1 24 33 INAO1 37 GAIN1 25 26 27 28 29 30 31 32 VRIN1 C11 0.047µ TCHC1 6DB 0DB TCLC11 C17 10µ TCLC12 C15 10µ TCO1 TCLC21 – 15 – NC ON OFF C12 0.0047µ FDIN1 C14 0.0068µ FNTO1 C16 0.22µ NC C13 10µ C1 0.001µ C2 10µ C3 33µ CXA1646Q/CXA1767Q Application Circuit CXA1646Q/CXA1767Q CXA1646Q/CXA1767Q Tone control characteristics +14dB +12dB 10 +10dB +8dB Response [dB] +6dB +4dB +2dB 0 0dB –2dB –4dB –6dB –8dB –10 –10dB –12dB –14dB 10 100 1k 10k 100k Frequency [Hz] CXA1646Q/CXA1767Q Loud characteristics VRC = 0dB 0 Response [dB] VRC = –8dB VRC = –16dB 10 VRC = –24dB –20 10 100 1k Frequency [Hz] – 16 – 10k CXA1646Q/CXA1767Q Setting Constants • LOUD The loudness function achieves the necessary frequency characteristics by passing through filter shown below. The resistor is built in the IC so that fL and fH are set by selecting CLDLC and CLDHC. I/fL = 2π CLDLCR1 I/fH = 2π CLDHCR2 CLDHC R2 7.97k 28k 13.2k R1 5.28k CLDLC AGND AGND fH fL – 17 – CXA1646Q/CXA1767Q • TONE CONTROL The tone control function achieves the necessary frequency characteristics by passing through LPF and HPF shown below. The resistor is built in the IC so that fL and fH are set by selecting CTLC12 and CTCHC. I/fL = 2π CTCLC12 (R3//R4) I/fH = 2π CTCHCR3 LPF R4 8k 8k R3 8k CTCLC12 8k AGND AGND AGND HPF 10k 10k 10k 10k R3 5k CTCHC AGND AGND fL fH – 18 – CXA1646Q/CXA1767Q • 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 45k VCT 45k GND – 19 – CXA1646Q/CXA1767Q Package Outline Unit: mm CXA1646Q 48PIN QFP (PLASTIC) 15.3 ± 0.4 + 0.1 0.15 – 0.05 + 0.4 12.0 – 0.1 36 25 0.15 24 48 13 13.5 37 12 0.8 + 0.15 0.3 – 0.1 ± 0.12 M 0.9 ± 0.2 1 + 0.2 0.1 – 0.1 + 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). – 20 – CXA1646Q/CXA1767Q CXA1767Q 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 – 21 –