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| Ordering number : EN5835 CMOS IC LC75374E Electronic Volume and Tone Control for Car Stereos Overview 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. Features * 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. * CCB is a trademark of SANYO ELECTRIC CO., LTD. Package Dimensions unit: mm 3148-QIP44MA [LC75374E] SANYO: QIP44MA * 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 = 25C, VSS = 0 V Parameter Maximum supply voltage Maximum input voltage Allowable power dissipation Operating temperature Storage temperature Symbol VDD max VIN max Pd max Topr Tstg VDD CL, DI, CE When Ta 85C and mounted on a printed circuit board Conditions Ratings 11 VSS - 0.3 to VDD + 0.3 720 -40 to +85 -50 to +125 Unit V V mW C C Allowable Operating Ranges at Ta = -40 to +85C, VSS = 0 V Parameter Supply voltage High-level input voltage Low-level input voltage Input voltage amplitude Input pulse width Setup time Hold time Operating frequency Symbol VDD VIH VIL VIN t W tsetup thold fopg VDD CL, DI, CE CL, DI, CE CL, DI, CE, LVRIN, RVRIN, L1 to L4, R1 to R4, LFIN, RFIN, LSIN, RSIN CL CL, DI, CE CL, DI, CE CL Conditions Ratings min 7.5 4.0 VSS VSS 1 1 1 500 typ max 9.7 VDD 1.0 VDD Unit V V V Vp-p s s s kHz Electrical Characteristics at Ta = 25C, VDD = 8 V, VSS = 0 V Parameter [Input Block] Maximum input gain Step resolution Output load resistance Output impedance [Output Block] Maximum output gain Output load resistance Output impedance [Volume Control Block] Step resolution Step error Output load resistance Output impedance [Fader Volume Control Block] STEP = 0 dB to -20 dB Step resolution ATstep STEP = -20 dB to -25 dB STEP = -25 dB to -45 dB Step error Output load resistance Output impedance [Bass and Treble Control Block] Bass control range Treble control range Output load resistance Output impedance Gbass Gtre RL RO LTOUT, RTOUT : RL = 10 k, f =1 k, VIN = 1 Vrms Max. Boost/Cut Max. Boost/Cut 8 8 10 46 11.9 11.9 13 13 dB dB k ATerr RL RO LFOUT, LROUT, RFOUT, RROUT : RL = 10 k, f = 1 kHz, VIN = 1 Vrms STEP = 0 dB to -45 dB STEP = -45 dB to -60 dB -2 -3 10 46 2 5 10 0 0 +2 +3 dB dB dB dB dB k ATstep ATerr RL RO LTOUT, RTOUT : RL = 10 k, f = 1 kHz, VIN = 1 Vrms STEP = 0 dB to -20 dB STEP = -20 dB to -50 dB -1 -3 10 46 1 0 0 +1 +3 dB dB dB k Gout max RL RO LFOUT, LROUT, RFOUT, RROUT : RL = 10 k, f = 1 kHz, VIN = 1 Vrms 10 35 +8.5 dB k Gin max Gstep RL RO LSEL0, RSEL0 : RL = 10 k, f = 1 kHz, VIN = 1 Vrms 10 46 +18.75 +1.25 dB dB k Symbol Conditions Ratings min typ max Unit Continued on next page. No. 5835-2/17 LC75374E Continued from preceding page. Electrical Characteristics at Ta = 25C, VDD = 8 V, VSS = 0 V Parameter [Super-Bass Block] (T type) Control range Step resolution Output load resistance Output impedance [Overall] Total harmonic distortion Crosstalk Output at maximum attenuation Output noise voltage High-level input voltage Low-level input voltage THD CT Vo min VN1 VN2 IIH IIL VIN = 1 Vrms, f = 1 kHz, All controls flat overall VIN = 1 Vrms, f = 1 kHz, All controls flat overall, Rg = 1 k VIN = 1 Vrms, f = 1 kHz, Main volume setting: - All controls flat overall, (IHF-A), Rg = 1 k All controls flat overall, (DIN-AUDIO), Rg = 1 k CL, DI, CE, VIN = 8 V CL, DI, CE, VIN = 0 V -10 0.003 80.5 -80 8 10 10 0.01 % dB dB V V A A Crange ATstep RL RO LSB2, RSB2 : RL = 10 k, f = 1 kHz, VIN = 1 Vrms 10 70 Max. Boost +20 +2.0 dB dB k Symbol Conditions Ratings min typ max Unit 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 1dB step control Fader rear/front control Rear Front Input switching control Input muting control Input gain control 4dB step control Channel selection 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 Description Notes 19 Vref * Supply voltage generator (0.525 x VDD) used for the analog ground. A capacitor must be connected between Vref and VSS to remove power supply ripple. 20 21 14 13 LROUT LFOUT RROUT RFOUT * Fader outputs. The front and rear outputs can be attenuated independently. 22 12 LFIN RFIN * Fader inputs * These inputs must be driven by low-impedance circuits. 24 23 LSB1 LSB2 * Left channel super bass compensation capacitor connection * Left channel super bass output and compensation capacitor connection * Right channel super bass compensation capacitor connection 10 11 RSB1 RSB2 * Right channel super bass output and compensation capacitor connection 22 7 LSIN RSIN * Super bass input * These inputs must be driven by low-impedance circuits. 28 6 LTOUT RTOUT * Tone control outputs Continued on next page. No. 5835-6/17 LC75374E Continued from preceding page. Pin No. Pin Description Notes 31 30 29 3 4 5 LT1 LT2 LT3 RT1 RT2 RT3 * 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. 32 2 LCOM RCOM * 1dB volume control common connections 33 1 LVRIN RVRIN * 4dB volume control inputs * These inputs must be driven by low-impedance circuits. 34 44 LSEL0 RSEL0 * Input selector outputs 38 37 36 35 40 41 42 43 39 15 16 17 L1 L2 L3 L4 R1 R2 R3 R4 VDD VSS CL DI * Power supply * Ground * Serial data and clock inputs used for transferring control data * Signal inputs 18 CE * 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. 8, 26 9, 25 NC * 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 k, and G = 20.65 dB, and f0 = 72.7 Hz. * Calculation (1) Center frequency 1 f0 = ------------------------ 2x x R1 x R2 x C x C (2) Gain G = 20log (3) Q C x C x R1 1 Q = ---------- x ---------------- 2xC R1 x R2 x C x C Fader Volume Control Block Equivalent Circuit R1 1 + ------ 2 x R2 * Determine R2 Determine R2 from formula (2). 64.5 R2 = -------------- 3.3 (k) 2 x (10.78 - 1) * Determine C Determine C from formula (1). 1 C = ------------------------------ 0.15 (F) R1 x R2 x (2 x x f0) x (2 x x f0) * Determine Q Determine Q from formula (3). Here, Q will be 2.21. 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 Main Volume Control Step Characteristics Fader Volume Control Step Characteristics Main volume attenuation -- dB Overall Main volume attenuation -- dB Overall Volume set level -- dB Selector + gain control block Main volume + tone control block Super bass block Fader volume control block Selector + gain control block Volume set level -- dB Main volume + tone control block Super bass block Fader volume control block Input Gain Control Step Characteristics Output Gain Control Step Characteristics Gain step output level -- dB Gain step output level -- dB Set level -- dB Overall Overall Set level -- dB Fader volume control block 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 No. 5835-14/17 LC75374E Total Harmonic Distortion - Frequency Characteristics Total harmonic distortion, THD -- % Total harmonic distortion, THD -- % Total Harmonic Distortion - Input Level Characteristics low-pass weighting position Frequency, f -- Hz Selector + gain control block Input level, VIN -- dBV Main volume + tone control block Super bass block Fader volume control block Total Harmonic Distortion - Supply Voltage Characteristics (1) Total harmonic distortion, THD -- % Total harmonic distortion, THD -- % Total Harmonic Distortion - Supply Voltage Characteristics (2) Supply voltage, VDD -- V Selector + gain control block Main volume + tone control block Fader volume control block Selector + gain control block Supply voltage, VDD -- V Main volume + tone control block Fader volume control block Super bass block Super bass block No. 5835-15/17 LC75374E Total Harmonic Distortion - Main Volume Control Step Characteristics Total harmonic distortion, THD -- % Super Bass Characteristics Overall Step -- dB Selector + gain control block Main volume + tone control block Fader volume control block Selector + gain control block Main volume + tone control block Output level -- dB Frequency, f -- Hz Fader volume control block Super bass block Bass Characteristics Treble Characteristics Overall Output level -- dB Frequency, f -- Hz Selector + gain control block Main volume + tone control block Output level -- dB 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 |
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