LC75394中文资料

Overview

The LC75394NE is an electronic volume control system providing control over volume, balance, 5-band equalizer,and input switching based on serial inputs.

Functions

?Volume control:

The chip provides 25 levels of volume attenuation: in 2-dB steps between 0 dB and –20 dB, 3-dB steps between –20 dB and –32 dB, 4-dB steps between –32 dB and –52dB, 4.5-dB steps between –52 dB and –70 dB, and –∞.Independent control over left and right channels provides balance control.?Equalizer:

The chip provides control in 2-dB steps over the range between +10 dB and –10 dB. Four of the five bands have peaking equalization; the remaining one, shelving equalization.?Selector:

The left and right channels each offer a choice of four inputs. An external constant determines the amplification for the input signal.

Features

?Built-in buffer amplifiers reduce the number of external parts necessary.

?Silicon gate CMOS reduces switching noise.?Serial data input

—Supports CCB* format communication with the system controller.

?A built-in reference voltage circuit divides the supply voltage (V DD ) in half.

Package Dimensions

unit: mm 3159-QFP64E

CMOS LSI

Ordering number : EN5466

SANYO: QFP64E

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN

Specifications

Absolute Maximum Ratings at Ta = 25°C, V SS = 0 V

Conditions

Ratings

Unit

12

CL, DI, CE, L1 to L4, R1 to R4, LTIN, RTIN, LVRIN, V SS – 0.3 to V DD + 0.3

310

mW –30 to +85–40 to +125

CCB is a trademark of SANYO ELECTRIC CO., https://www.wendangku.net/doc/af19139787.html,B is SANYO’s original bus format and all the bus addresses are controlled by SANYO.

*

Allowable Operating Ranges at Ta = 25°C, V SS= 0 V

Electrical Characteristics at Ta = 25°C, V DD= 10 V, V SS= 0 V

Input Amplifier Characteristics at Ta = 25°C, V DD– V SS= 10 V

Equivalent Block Diagram and Sample Application Circuit

Test Circuits

1.Total Harmonic Distortion

2.Output Noise Voltage

3.Crosstalk

Pin Assignment

Pin Functions

Continued on next page.

Continued from preceding page.

Input Block Internal Equivalent Circuit Diagram

Volume Control Block Internal Equivalent Diagram

Equalizer Control Block Internal Equivalent Circuit (Bands F1 to F4)

Calculating the Size of External Capacitors

The LC75394NE supports four bands with peaking characteristics and one band with shelving characteristics

1.Peaking Characteristics (bands F1 to F4)

The external capacitor functions as the structural element of a simulated inductor. The equivalent circuit and the calculations required to achieve the desired center frequency are shown below.

?Equivalent circuit for the simulated inductor

?Calculation example

Specifications: Central frequency, F O= 107 Hz

Q factor at maximum boost, Q+10 dB= 0.8

—Calculate Q O, the sharpness of the simulated inductance itself.

Q O= (R1 + R4)/R1 ×Q+10dB Note: R4 is from the separately issued internal block diagram.

≠4.270

—Calculate C1

C1 = 1/2πF O R1Q O≠0.536 (μF)

—Calculate C2

C2 = Q O/2πF O R2 ≠0.021 (μF)

?Sample results

?Shelving characteristics (Band F5)

Achieving the desired control of 2-dB steps over the range between +10 dB to –10 dB requires choosing a capacitor, C3, with an impedance of 650 ?.

Control System Timing and Data Formats

The LC75394NE receives its control sequences via a serial interface comprised of pins CE, CL, and DI. Each sequence consists of 40 bits: an 8-bit address followed by 32 bits of data.

Usage Notes

1.When the power is first applied, the internal analog switches are in indeterminate states. The chip therefore requires

muting or other external measures until it has received the proper data.

2.Provide grounding patterns or shielding for the lines to the CL, DI, and CE pins so as to prevent their high-frequency

data signals from interfering with the operation of nearby analog circuits.

s 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.

s Anyone purchasing any products described or contained herein for an above-mentioned use shall: 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:

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.

s 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 September, 1996. Specifications and information herein are subject to change without notice.