MAX1021 datasheet(25/47 Pages) MAXIM

25 / 47 page

10-Bit, Multichannel ADCs/DACs with FIFO,

Temperature Sensing, and GPIO Ports

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Table 5. Setup Register*

BIT NAME

BIT

FUNCTION

—7 (MSB)

Set to zero to select setup register.

—6

Set to one to select setup register.

CKSEL1

Clock mode and CNVST configuration; resets to one at power-up.

CKSEL0

Clock mode and CNVST configuration.

REFSEL1

Reference-mode configuration.

REFSEL0

Reference-mode configuration.

DIFFSEL1

Unipolar-/bipolar-mode register configuration for differential mode.

DIFFSEL0

0 (LSB)

Unipolar-/bipolar-mode register configuration for differential mode.

Table 5a. Clock Modes (see the Clock Mode section)

CKSEL1

CKSEL0

CONVERSION CLOCK

ACQUISITION/SAMPLING

CNVST CONFIGURATION

Internal

Internally timed.

CNVST

Internal

Externally timed by CNVST.

CNVST

Internal

Internally timed.

AIN15/AIN11/AIN7

External (4.8MHz max)

Externally timed by SCLK.

AIN15/AIN11/AIN7

Table 5b. Clock Modes 00, 01, and 10

REFSEL1

REFSEL0

VOLTAGE

REFERENCE

OVERRIDE

CONDITIONS

AUTOSHUTDOWN

REF2

CONFIGURATION

AIN

Internal reference turns off after scan is complete. If

internal reference is turned off, there is a programmed

delay of 218 internal-conversion clock cycles.

Internal (DAC

and ADC)

Temperature

Internal reference required. There is a programmed

delay of 244 internal-conversion clock cycles for the

internal reference to settle after wake-up.

AIN14/AIN10/AIN6

AIN

Internal reference not used.

External single-

ended (REF1

for DAC and

REF2 for ADC)

Temperature

Internal reference required. There is a programmed

delay of 244 internal-conversion clock cycles for the

internal reference to settle after wake-up.

REF2

AIN

Default reference mode. Internal reference turns off

after scan is complete. If internal reference is turned

off, there is a programmed delay of 218 internal-

conversion clock cycles.

Internal (ADC)

and external

REF1 (DAC)

Temperature

Internal reference required. There is a programmed

delay of 244 internal-conversion clock cycles for the

internal reference to settle after wake-up.

AIN14/AIN10/AIN6

AIN

Internal reference not used.

External

differential

(ADC), external

REF1 (DAC)

Temperature

Internal reference required. There is a programmed

delay of 244 internal-conversion clock cycles for the

internal reference to settle after wake-up.

REF2

*See below for bit details.

MAX1021 Datasheet(PDF) 25 Page - Maxim Integrated Products

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