Ordering number : EN5002A CMOS LSI LC75383E Electronic Volume Control for Car Audio Systems Overview Package Dimensions The LC75383E is an electronic volume control that provides volume, balance, fader, bass/treble, input switching and input level controls. The LC75383E supports all these functions while requiring a minimum number of external components. unit: mm 3159-QFP64E [LC75383E] Features • Volume: 0 dB to –79 dB (in 1 dB steps) and –∞; 81 positions. A balance function can be implemented using the LC75383E independent left and right volume control functions. • Fader: The rear channels or the front channels can be attenuated over 16 positions: from 0 dB to –20 dB in 2 dB steps, from –20 dB to –25 dB in one 5 dB step, from –25 dB to –45 dB in 10 dB steps, –60 dB, and –∞ for a total of 16 positions. • Bass/treble: The LC75383E supports 21 position bass and treble controls using external capacitors. • Input selector: The LC75383E can select one of four L/R inputs. The selected input signal can be amplified from 0 dB to +18 dB in 6 dB steps. • Built-in operational amplifiers mean that few external components are required. • Silicon gate process for minimal switching noise. • All controls can be set from serial input data (CCB). SANYO: QIP64E • CCB is a trademark of SANYO ELECTRIC CO., LTD. • CCB is SANYO’s original bus format and all the bus addresses are controlled by SANYO. Specifications Absolute Maximum Ratings at Ta = 25°C, VSS = 0 V Parameter Maximum supply voltage Symbol Conditions Ratings VDD max VDD Maximum input voltage VIN max CL, DI, CE, LTIN, RTIN, L10dBIN, R10dBIN, L1dBIN, R1dBIN, LFIN, RFIN, L1 to L4, R1 to R4 Allowable power dissipation Pd max Ta ≤ 85°C Unit 12 V VSS – 0.3 to VDD + 0.3 V 310 mW Operating temperature Topr –40 to +85 °C Storage temperature Tstg –50 to +125 °C SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN N2095HA (OT)/62895HA (OT) No. 5002-1/17 LC75383E Allowable Operating Ranges at Ta = 25°C, VSS = 0 V Parameter Symbol Conditions min typ max Unit Supply voltage VDD VDD 6.0 11.0 V Input high level voltage VIH CL, DI, CE 4.0 VDD V Input low level voltage VIL CL, DI, CE VSS 1.0 V Input voltage amplitude VIN LTIN, RTIN, L10dBIN, R10dBIN, L1dBIN, R1dBIN, LFIN, RFIN, L1 to L4, R1 to R4 VSS VDD Vp-p tøW Input pulse width CL 1 µs Setup time tSETUP CL, DI, CE 1 µs Hold time tHOLD CL, DI, CE 1 Operating frequency fopg µs CL 500 kHz max Unit Electrical Characteristics at Ta = 25°C, VDD = 9 V, VSS = 0 V Parameter Symbol Conditions min typ [Input Block] Input resistance Rin L1, L2, L3, L4, R1, R2, R3, R4 1 Clipping level Vcl LSELO, RSELO: THD = 1.0% 2.35 RL LSELO, RSELO Output load resistance MΩ Vrms 10 kΩ Minimum input gain Gin min –2 0 +2 dB Maximum input gain Gin max +16.0 +18.0 +20.0 dB Step resolution Gstep +6.0 dB [Volume Block] Input resistance Step resolution Step error Rv10 L10dBIN, R10dBIN: 10 dB steps Rv1 L1dBIN, R1dBIN: 1 dB steps 21 35 49 kΩ 6 10 14 kΩ ATstep ATerr 1 dB Step = 0 to –40 dB, –40 to –60 dB –1 0 +1 dB LFIN, RFIN 12 20 28 kΩ [Fader Volume Block] Input resistance Step resolution Rfed ATstep Step = 0 to –20 dB 2 dB Step = –20 to –25 dB 5 dB Step = –25 to –45 dB Step error Output load resistance 10 ATerr Step = 0 to –40 dB, –40 to –60 dB –2 RL LFOUT, LROUT, RFOUT, RROUT 10 0 dB +2 dB kΩ [Bass/Treble Control Block] Control range Gbass Gtre Max. boost/cut ±15 ±17 ±19 dB Step resolution Bstep 0.7 1.7 2.7 dB Internal feedback resistance Rfeed 46 76 107 kΩ % [Overall] Total harmonic distortion Crosstalk Maximum attenuation Output noise voltage THD (1) VIN = 300 mVrms, f = 1 kHz, all controls flat overall 0.005 0.01 THD (2) VIN = 300 mVrms, f = 20 kHz, all controls flat overall 0.008 0.02 CT VIN = 1 Vrms, f = 1 kHz, all controls flat overall, Rg = 1 kΩ 60 84.5 –65 –80 % dB Vo min VIN = 1 Vrms, f = 1 kHz, main volume at –∞ VN (1) All controls flat overall (IHF-A), Rg = 1 kΩ 5.2 12 µV VN (2) All controls flat overall (DIN-AUDIO), Rg = 1 kΩ 7.2 16 µV VN (3) All controls flat overall (NO-FILTER), Rg = 1 kΩ 9.2 20 µV VN (4) Gv = +18 dB (IHF-A), Rg = 1 kΩ 23 50 µV VN (5) Bass = max. boost, treble = max. boost (IHF-A), Rg = 1 kΩ 48 120 µV 28 33 mA 10 µA Current drain IDD VDD – VSS = 11 V Input high level current IIH CL, DI, CE, VIN = 9 V Input low level current IIL CL, DI, CE, VIN = 0 V –10 dB µA No. 5002-2/17 LC75383E Equivalent Circuit Block Diagram No. 5002-3/17 LC75383E Electrical Characteristics Test Circuits 1. Total Harmonic Distortion No. 5002-4/17 LC75383E 2. Output Noise Voltage No. 5002-5/17 LC75383E 3. Crosstalk No. 5002-6/17 LC75383E Pin Assignment Pin Functions Pin No. Symbol 58 LROUT 60 LFOUT 55 RROUT 53 RFOUT Function Note Fader block outputs. Only the front or rear channels are attenuated. The left and right attenuations are identical. Since these are operational amplifier outputs, the output is low impedance. 61 LFIN Fader block inputs. 52 RFIN Must be driven by low impedance circuits. 64 LVref 49 RVref Common connections for the main volume, fader block, tone block and gain control block. 56 Vref Capacitors of about 100 µF must be inserted between Vref and AVSS (VSS) to reduce power supply ripple in the VDD/2 voltage generation block. Continued on next page. No. 5002-7/17 LC75383E Continued from preceding page. Pin No. Symbol 6 L1dBOUT 43 R1dBOUT Function Main volume 1 dB step attenuator outputs 8 L1dBIN Main volume 1 dB step attenuator inputs 41 R1dBIN Must be driven by low impedance circuits. 9 L10dBOUT 40 R10dBOUT Note Main volume 10 dB step attenuator outputs 11 L10dBIN Main volume 10 dB step attenuator inputs 38 R10dBIN Must be driven by low impedance circuits. 62 LTOUT 51 RTOUT 4 LT1 3 LT2 2 LT3 45 RT1 46 RT2 47 RT3 1 LT4 48 RT4 63 LT5 50 RT5 Unnecessary frequencies can be excluded by inserting capacitors of desired values between the T5 and TOUT pin pairs. 5 LTIN Tone control circuit inputs 44 RTIN Must be driven by low impedance circuits. Tone control outputs Connections for the capacitors that form the low frequency (bass) tone control filters Low frequency compensation capacitors must be connected between T1 and T2 and between T2 and T3. Connections for the capacitors that form the high frequency (treble) tone control filters High frequency compensation capacitors must be connected between the T4 pins and Vref. Inverting inputs for the operational amplifiers that form the tone control circuit filters Continued on next page. No. 5002-8/17 LC75383E Continued from preceding page. Pin No. Symbol 57 VDD 27 A. VSS 22, 26 VSS 21 L1 19 L2 17 L3 15 L4 28 R1 30 R2 32 R3 34 R4 12 LSELO 37 RSELO 25 CE 24 DI 23 CL 13 LV1 36 RV1 7, 10, 14, 16, 18, 20, 29, 31, 33, 35, 39, 42, 54, 59 NC Function Note Power supply Ground for internal operational amplifiers Ground for the internal logic system Audio signal inputs Input selector outputs Chip enable. Data is written to the internal latch when this pin goes from high to low. The analog switches operate at that point also. Data transfer is enabled when this pin is high. Serial data and clock pins for IC control Test pins. These pins must be left open. No connection pins. These pins must be left open or tied to VSS. No. 5002-9/17 LC75383E Equivalent Circuit Details Input Block Equivalent Circuit 10 dB Step Volume Control Equivalent Circuit No. 5002-10/17 LC75383E 1 dB Step Volume Control Equivalent Circuit Tone Block Equivalent Circuit No. 5002-11/17 LC75383E Sample Calculation for the Tone Block External Capacitors The external capacitors used with the LC75383E are the structural components in semiconductor inductors, i.e., simulated inductors. Here we present the equivalent circuit and the formulas required to acquire the desired center frequency. 1. Semiconductor inductor equivalent circuit 2. Sample calculation Specifications: 1) Center frequency: Fo = 100 Hz 2) Q at maximum boost: Qmax = 1.05 • Derive the sharpness, Qo, of the semiconductor inductor itself Qo = (RT4 + Rfeed) × Qmax ≈ 2.6481 RT4 • Calculate C1 C1 = 1/2πFoRT4Qo ≠ 0.60 (µF) • Calculate C2 C2 =Qo/2πFoRT3 ≠ 0.014 (µF) Note: See the tone block equivalent circuit for the internal resistance. Technique for Reducing Noise in the Tone Circuit Output The output noise can be improved by about 6 dB by providing an external impedance at resonance of Zo and adding the capacitor C3 with a value of about 100 pF. An even larger noise reduction effect can be acquired by using a low noise operational amplifier in the external circuit. No. 5002-12/17 LC75383E Fader Volume Control Equivalent Circuit When the main volume 1dBSTEP setting is set to the data value for –∞, S1 and S2 will be open and at the same time S3 and S4 will be on. No. 5002-13/17 LC75383E Control System Timing and Data Format The LC75383E is controlled by inputting the stipulated serial data to the CE, CL and DI pins. The data structure consists of a total of 40 bits, of which 8 bits are address and 32 bits are setting data. No. 5002-14/17 LC75383E Sample Application Circuit Usage Notes 1. The states of the internal analog switches are undefined when power is first applied. Muting should be applied externally until control data has been transferred and stored. 2. The signal lines for the CL, DI and CE pins should either be covered by the pattern ground or be formed from shielded cable to prevent the high-frequency digital signals transmitted over these lines from entering the analog system. No. 5002-15/17 LC75383E No. 5002-16/17 LC75383E ■ No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. ■ Anyone purchasing any products described or contained herein for an above-mentioned use shall: ➀ Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: ➁ Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. ■ Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of February, 1997. Specifications and information herein are subject to change without notice. No. 5002-17/17