LC78836 Просмотр технического описания (PDF) - SANYO -> Panasonic

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LC78836

Digital Audio 16-Bit D/A Converter with On-Chip Digital Filters

SANYO -> Panasonic 

LC78836M

Operating Description

1. Digital Filters

The LC78836M performs the following calculations.

• Oversampling

The oversampling circuit consists of 2× interpolation filters (implemented as FIR filters) connected in series.

In standard-speed operation, the circuit implements 8× oversampling by connecting three stages of FIR filters

(33rd,13th, and ninth orders) in series. In double speed operation, the circuit implements 4× oversampling by

connecting two stages of FIR filters (33rd and ninth orders) in series. See page 9 for the filter characteristics.

• De-emphasis

The LC78836M implements digital de-emphasis with a first-order IIR filter. The filter coefficients correspond to

sampling frequencies (fs) of 32, 44.1, and 48 kHz. (The frequencies are doubled in double-speed operation.)

See page 10 for the filter characteristics when de-emphasis is on.

— De-emphasis on/off switching

De-emphasis on: EMP = high

De-emphasis off: EMP = low

— Filter coefficient selection

FS1

L

H

H

L

FS2

L

L

H

H

fs

44.1 kHz

32 kHz

48 kHz

No. 5127-5/12

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