LC78836M 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LC78836M

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

SANYO -> Panasonic 

LC78836M

5. D/A Converter Block

The LC78836M incorporates an independent 16-bit D/A converter and an operational amplifier for signal output for

each channel (CH1 and CH2). It adopts a dynamic level shifting conversion technique that uses a resistor-string D/A

converter, a PWM (pulse width modulation) D/A converter, and a level shifting D/A converter. (See figure.)

• Resistor-string D/A converter

This is an 8-bit D/A converter in which a total of 256 (= 28) unit-resistance resistors are connected in series and the

potential applied to the ends of that resistor string is voltage divided into 256 equal intervals. Of these resistor-

divided potentials, two adjacent potentials, V1 and V2, are selected by a switching circuit according to the value of

the upper 8 bits of the data. These two potentials are output to the PWM D/A converter. Note that these potentials

are related as follows:

V2 – V1 = (VH – VL)/256

• PWM D/A converter

This is a 4-bit D/A converter that divides (by 16) the interval between the two potentials, V1 and V2, output by the

resistor-string D/A converter. This circuit outputs one or the other of the V1 and V2 potentials from the CH1OUT

(or CH2OUT) pin according to the value of the middle 4 bits of the data (D7 to D4).

No. 5127-8/12

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