AD7853_15 datasheet(27/34 Pages) AD

27 / 34 page

REV. B

–27–

AD7853/AD7853L

CONFIGURING THE AD7853/AD7853L

AD7853/AD7853L as a Read-Only ADC

The AD7853/AD7853L contains fourteen on-chip registers

which can be accessed via the serial interface. In the majority of

applications it will not be necessary to access all of these regis-

ters. Figure 38 outlines a flowchart of the sequence which is

used to configure the AD7853/AD7853L as a Read-Only ADC.

In this case there is no writing to the on-chip registers and only

the conversion result data is read from the part. Interface Mode

1 cannot be used in this case as it is necessary to write to the

control register to set Interface Mode 1. Here the CLKIN signal

is applied directly after power-on, the CLKIN signal must be

present to allow the part to perform a calibration. This auto-

matic calibration will be completed approximately 32 ms after

the AD7853 has powered up (4 MHz CLK).

SERIAL

INTERFACE

MODE

POWER-ON, APPLY CLKIN SIGNAL,

WAIT FOR AUTOMATIC CALIBRATION

DIN CONNECTED TO DGND

YES

START

WAIT FOR BUSY SIGNAL

TO GO LOW

PULSE

CONVST PIN

READ

DATA

DURING

CONVERSION

WAIT APPROXIMATLY 200ns

AFTER

CONVST RISING EDGE

APPLY

SYNC (IF REQUIRED), SCLK AND READ

CONVERSION RESULT ON DOUT PIN

PULSE

CONVST PIN

SYNC AUTOMATICALLY GOES LOW

AFTER

CONVST RISING EDGE

SCLK AUTOMATICALLY ACTIVE, READ

CONVERSION RESULT ON DOUT PIN

4, 5

2, 3

Figure 40. Flowchart for Setting Up and Reading from the AD7853/AD7853L

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