Ordering number : EN5835 CMOS IC LC75374E Electronic Volume and Tone Control for Car Stereos Overview Features The LC75374E is an electronic volume and tone control circuit that provides volume, balance, fader, bass and treble, super bass, input switching, and input and output level controls and requires a minimal number of external components to implement these functions. • On-chip buffer amplifiers minimizes the number of external components. • Built-in reference voltage generator for the analog ground. • All controls can be set using the serial data input circuit (CCB). Functions • Volume: 0dB to –79dB (in 1-dB steps) and –∞dB for a total of 81 positions. A balance function can be implemented by controlling the left and right channels independently. • Fader: Allows either the rear or the front channel outputs to be attenuated over 16 positions. (0 to –20dB in 2dB steps, –20 to –25dB in a 5dB step, –25 to –45dB in 10dB steps, –60dB, and –∞dB for a total of 16 positions.) • Bass and treble: NF-type tone control circuits are form– ed using external CR circuits. The bass and treble can be controlled from 0dB to +11.9dB (in 1.7dB steps) for a total of 15 positions. • Input gain: The input signal can be amplified by 0dB to +18.75dB (in 1.25dB steps). • Output gain: The fader output can be set to one of three settings: 0dB, +6.5dB, or +8.5dB. • Input switching: Both the left and right channels can be selected from one of four inputs. • Super bass: This circuit provides peaking characteristics (T type characteristics) and 11 position sett– ings. Package Dimensions unit: mm 3148-QIP44MA [LC75374E] SANYO: QIP44MA • 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. Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft’s control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein. SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN N3098RM (OT) No. 5835-1/17 LC75374E Specifications Absolute Maximum Ratings at Ta = 25°C, VSS = 0 V Parameter Symbol Conditions Maximum supply voltage VDD max VDD Maximum input voltage VIN max CL, DI, CE Allowable power dissipation Pd max When Ta ≤ 85°C and mounted on a printed circuit board Ratings Unit 11 VSS – 0.3 to VDD + 0.3 720 V V mW Operating temperature Topr –40 to +85 °C Storage temperature Tstg –50 to +125 °C Allowable Operating Ranges at Ta = –40 to +85°C, VSS = 0 V Parameter Symbol Conditions Ratings min typ max Unit Supply voltage VDD VDD 7.5 9.7 V High-level input voltage VIH CL, DI, CE 4.0 VDD V Low-level input voltage VIL CL, DI, CE VSS 1.0 V VIN CL, DI, CE, LVRIN, RVRIN, L1 to L4, R1 to R4, LFIN, RFIN, LSIN, RSIN VSS VDD Vp-p Input pulse width tφ W CL 1 µs Setup time tsetup CL, DI, CE 1 µs Hold time thold CL, DI, CE 1 Operating frequency fopg CL Input voltage amplitude µs 500 kHz Electrical Characteristics at Ta = 25°C, VDD = 8 V, VSS = 0 V Parameter Symbol Conditions Ratings min typ max Unit [Input Block] Maximum input gain Step resolution Gin max +18.75 dB Gstep +1.25 dB Output load resistance RL Output impedance RO 10 LSEL0, RSEL0 : RL = 10 kΩ, f = 1 kHz, VIN = 1 Vrms kΩ Ω 46 [Output Block] Maximum output gain Gout max Output load resistance RL Output impedance RO +8.5 dB 10 LFOUT, LROUT, RFOUT, RROUT : RL = 10 kΩ, f = 1 kHz, VIN = 1 Vrms kΩ Ω 35 [Volume Control Block] Step resolution Step error ATstep ATerr Output load resistance RL Output impedance RO 1 dB STEP = 0 dB to –20 dB –1 0 +1 STEP = –20 dB to –50 dB –3 0 +3 10 dB dB kΩ 46 Ω STEP = 0 dB to –20 dB 2 dB STEP = –20 dB to –25 dB 5 dB STEP = –25 dB to –45 dB 10 LTOUT, RTOUT : RL = 10 kΩ, f = 1 kHz, VIN = 1 Vrms [Fader Volume Control Block] Step resolution Step error ATstep ATerr Output load resistance RL Output impedance RO dB STEP = 0 dB to –45 dB –2 0 +2 STEP = –45 dB to –60 dB –3 0 +3 10 LFOUT, LROUT, RFOUT, RROUT : RL = 10 kΩ, f = 1 kHz, VIN = 1 Vrms dB dB kΩ Ω 46 [Bass and Treble Control Block] Bass control range Treble control range Gbass Max. Boost/Cut ±8 ±11.9 ±13 Gtre Max. Boost/Cut ±8 ±11.9 ±13 Output load resistance RL Output impedance RO 10 LTOUT, RTOUT : RL = 10 kΩ, f =1 kΩ, VIN = 1 Vrms dB dB kΩ 46 Ω Continued on next page. No. 5835-2/17 LC75374E Continued from preceding page. Electrical Characteristics at Ta = 25°C, VDD = 8 V, VSS = 0 V Parameter Symbol Conditions Ratings min typ max Unit [Super-Bass Block] (T type) Control range Crange Step resolution ATstep Output load resistance RL Output impedance RO Max. Boost +20 dB +2.0 dB 10 LSB2, RSB2 : RL = 10 kΩ, f = 1 kHz, VIN = 1 Vrms kΩ Ω 70 [Overall] Total harmonic distortion Crosstalk Output at maximum attenuation Output noise voltage THD CT Vo min VN1 VN2 VIN = 1 Vrms, f = 1 kHz, All controls flat overall 0.003 0.01 % VIN = 1 Vrms, f = 1 kHz, All controls flat overall, Rg = 1 kΩ 80.5 VIN = 1 Vrms, f = 1 kHz, Main volume setting: –∞ –80 dB 8 µV All controls flat overall, (IHF-A), Rg = 1 kΩ All controls flat overall, (DIN-AUDIO), Rg = 1 kΩ High-level input voltage IIH CL, DI, CE, VIN = 8 V Low-level input voltage IIL CL, DI, CE, VIN = 0 V dB 10 µV 10 –10 µA µA Pin Assignment No. 5835-3/17 LC75374E Equivalent Circuit No. 5835-4/17 LC75374E Control System Timing and Data Format Applications must input the stipulated serial data to the CE, CL, and DI pins to control the LC75374E. The data consists of a total of 52 bits, of which 8 bits are address and 44 bits are data. Address code Fader step control Bass control Fader rear/front control 1dB step control Rear Front Input muting control Input switching control Input gain control Channel selection 4dB step control Initial setting Lch Rch Left and right at the same time Treble control Super bass/super treble control Output gain control Note: Bits D36 to D38 and bits D40 to D43 are IC test data. Applications must set all these bits to 0. No. 5835-5/17 LC75374E Pin Functions Pin No. Pin 19 Vref 20 LROUT 21 LFOUT 14 RROUT 13 RFOUT Description Notes • Supply voltage generator (0.525 × VDD) used for the analog ground. A capacitor must be connected between Vref and VSS to remove power supply ripple. • Fader outputs. The front and rear outputs can be attenuated independently. 22 LFIN • Fader inputs 12 RFIN • These inputs must be driven by low-impedance circuits. 24 LSB1 • Left channel super bass compensation capacitor connection 23 LSB2 • Left channel super bass output and compensation capacitor connection 10 RSB1 11 RSB2 • Right channel super bass output and compensation capacitor connection 22 LSIN • Super bass input 7 RSIN • These inputs must be driven by low-impedance circuits. • Right channel super bass compensation capacitor connection 28 LTOUT 6 RTOUT • Tone control outputs Continued on next page. No. 5835-6/17 LC75374E Continued from preceding page. Pin No. Pin 31 LT1 30 LT2 29 LT3 3 RT1 4 RT2 5 RT3 32 LCOM 2 RCOM Description • Tone control circuit bass and treble compensation capacitor connections. Connect the high band compensation capacitors between the pins T1 and T2. Connect the low band compensation capacitors between the pins T2 and T3. • 1dB volume control common connections 33 LVRIN • 4dB volume control inputs 1 RVRIN • These inputs must be driven by low-impedance circuits. 34 LSEL0 44 RSEL0 38 L1 37 L2 36 L3 • Input selector outputs 35 L4 40 R1 41 R2 42 R3 43 R4 39 VDD • Power supply 15 VSS • Ground 16 CL 17 DI 18 CE 8, 26 9, 25 NC Notes • Signal inputs • Serial data and clock inputs used for transferring control data • Chip enable input. Data is written into the internal latches and the analog switches operate when this pin goes from high to low. Data transfers are enabled when this pin is high. • Unused pins. These pins must be connected to VSS. • Unused pins. These pins must be left open. No. 5835-7/17 LC75374E Input Block Equivalent Circuit The right channel is identical. No. 5835-8/17 LC75374E Main Volume Control Block Equivalent Circuit To the tone control block Switch used for initial settings Switch used for initial settings The right channel is identical. No. 5835-9/17 LC75374E Tone Block Equivalent Circuit From the main volume control block The right channel is identical. No. 5835-10/17 LC75374E Super Bass Block Equivalent Circuit The right channel is identical. No. 5835-11/17 LC75374E Sample external constant calculations for the super bass (T type) circuit when full boost is used The external constants required when full boost is used with the super bass block (T type) are calculated as follows. • Super bass (T type) equivalent circuit Sample calculation Assume: R1 = 64.5 kΩ, and G = 20.65 dB, and f0 = 72.7 Hz. • Calculation (1) Center frequency 1 f0 = ———————————— 2× π × R1 × R2 × C × C (2) Gain G = 20log R1 1 + ——— 2 × R2 (3) Q C × C × R1 1 Q = ————— × ———————— 2×C R1 × R2 × C × C • Determine R2 Determine R2 from formula (2). 64.5 R2 = ——————— ≈ 3.3 (kΩ) 2 × (10.78 – 1) • Determine C Determine C from formula (1). 1 C = ——————————————— ≈ 0.15 (µF) R1 × R2 × (2 × π × f0) × (2 × π × f0) • Determine Q Determine Q from formula (3). Here, Q will be 2.21. Fader Volume Control Block Equivalent Circuit S2 and S3 will be on when FADER = 1. S1 and S4 will be on when FADER = 0. The right channel is identical. At the point that data corresponding to –∞ is transferred to the 1dB –step main volume control block, S1 and S2 will go to the open state. S3 and S4 will go to the on state at the same time. No. 5835-12/17 LC75374E Sample Application Circuit Usage Notes • The internal analog switches are in undefined states when power is first applied. Applications must therefore use external circuits to mute the output until control data has been transferred. • When setting up the initial data after power is first applied, applications must first transfer a set of IC initialization data. This initialization data consists of an address field of (10000001) and a data field of all zeros (D0 to D43 = 0). Applications must only send the actual initial data after this initialization data has been sent. • Applications must either cover the CL, DI, and CE lines with the ground pattern or use shielded cables for these lines to prevent the high-frequency digital signals that are transmitted over these lines from entering the analog signal system. No. 5835-13/17 LC75374E Fader Volume Control Step Characteristics Main volume attenuation — dB Main volume attenuation — dB Main Volume Control Step Characteristics Overall Overall Volume set level — dB Volume set level — dB Selector + gain control block Main volume + tone control block Super bass block Selector + gain control block Fader volume control block Gain step output level — dB Gain step output level — dB Main volume + tone control block Super bass block Fader volume control block Overall Set level — dB Selector + gain control block Super bass block Output Gain Control Step Characteristics Input Gain Control Step Characteristics Overall Main volume + tone control block Set level — dB Fader volume control block Selector + gain control block Main volume + tone control block Super bass block Fader volume control block No. 5835-14/17 LC75374E Total Harmonic Distortion - Input Level Characteristics Total harmonic distortion, THD — % Total harmonic distortion, THD — % Total Harmonic Distortion - Frequency Characteristics low-pass weighting position Input level, VIN — dBV Frequency, f — Hz Selector + gain control block Main volume + tone control block Super bass block Fader volume control block Total Harmonic Distortion - Supply Voltage Characteristics (2) Total harmonic distortion, THD — % Total harmonic distortion, THD — % Total Harmonic Distortion - Supply Voltage Characteristics (1) Supply voltage, VDD — V Supply voltage, VDD — V Selector + gain control block Main volume + tone control block Super bass block Fader volume control block Selector + gain control block Main volume + tone control block Super bass block Fader volume control block No. 5835-15/17 LC75374E Total harmonic distortion, THD — % Total Harmonic Distortion – Main Volume Control Step Characteristics Super Bass Characteristics Output level — dB Overall Step — dB Selector + gain control block Main volume + tone control block Frequency, f — Hz Selector + gain control block Fader volume control block Super bass block Bass Characteristics Main volume + tone control block Fader volume control block Treble Characteristics Output level — dB Output level — dB Overall Frequency, f — Hz Selector + gain control block Main volume + tone control block Frequency, f — Hz Super bass block Fader volume control block Selector + gain control block Main volume + tone control block Super bass block Fader volume control block No. 5835-16/17 LC75374E Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer’s products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer’s products or equipment. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO products (including technical data, services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the “Delivery Specification” for the SANYO product that you intend to use. 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 November, 1998. Specifications and information herein are subject to change without notice. PS No. 5835-17/17