LC75348M Просмотр технического описания (PDF) - SANYO -> Panasonic

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Компоненты Описание

производитель

LC75348M

Single-Chip Electronic Volume and Tone Control System

SANYO -> Panasonic 

LC75348, 75348M

• Zero cross timer setting

If the input signal is lower than the zero cross comparator detection sensitivity, or if a low-frequency signal is input, the

state in which the circuit cannot detect a zero cross may continue and the input data will not be latched during that

period.

The zero cross timer sets a time for the data to be latched forcibly in states such as this where a zero cross cannot be

detected.

For example, to set a 25 ms time:

T = 0.69 CR

Assume C = 0.068 µF. The R will be:

R = ———2—5 ×—1—0–—3 —— ≈ 530 kΩ

0.69 × 0.068 × 10–6

Normally, a time in the range 10 to 50 ms is used.

• Notes on serial data transfer

(1) Cover the CL, DI, and CE signal lines with the ground pattern or use shielded lines to prevent the high-frequency

digital signals carried by these lines from entering the analog signal system.

(2) The LC75348 and LC75348M data format consists of 8 bits of address and 32 bits of data. When transmitting data

as an even multiple of 8 bits (when transferring 36 bits of data), use the data format shown below.

LC75348 and LC75348M Data Reception in Multiples of 8 Bits

X X X X D0 D1 D2 D3

Dummy data

Input switching control

D24 D25 D26 D27 D28 D29 D30 D31

Test mode control

X: don’t care

No. 7308 -18/21

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