PCD6003 datasheet(72/96 Pages) PHILIPS

72 / 96 page

2001 Apr 17

Philips Semiconductors

Product speciﬁcation

Digital telephone answering machine chip

PCD6003

16.1.3

GENERAL PURPOSE DAC

The on-chip DAC is a single channel 8-bit converter. The control of this converter is done via the GPDAR register. The

value written in this register triggers the conversion which will be present at the output pin after the digital-to-analog

conversion cycle (<25

µs). The range from the digital-to-analog output is 0 to 2000 mV (VREF).

The conversion principle for both analog-to-digital and digital-to-analog conversion is shown in Fig.34.

16.1.3.1

General Purpose DAC Register (GPDAR)

Table 67 General Purpose DC A Register (SFR address C4H); reset state 80H

76543210

D/A.7

D/A.6

D/A.5

D/A.4

D/A.3

D/A.2

D/A.1

D/A.0

handbook, full pagewidth

MGM796

VACM

RDAC

VADC

AVS

AAD

SYMOD.4 (MIC supply bit)

VMIC

Vref

DAOUT

AD0IN

AD1IN

VREFR

DCA

GPADC

GPDAR

GPADR

GPADC

(channel

request bit)

VBGP

Fig.33 The architecture of the auxiliary DAC and ADC.

handbook, full pagewidth

MGM797

time

pin GPDAR

represents output

GPADC SFR

has been changed

by the microcontroller

GPADC SFR

has been changed

by the micro

HW resets request bit.

Conversion finished.

Result in GPADR SFR

conversion cycle (

<30 µs)

analog-to-digital conversion

conversion cycle (

<10 µs)

digital-to-analog conversion

Fig.34 Analog-to-digital and digital-to-analog conversion principle.

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