MAX1021 datasheet(33/40 Pages) MAXIM

33 / 40 page

10-Bit, Multichannel ADCs/DACs with FIFO,

Temperature Sensing, and GPIO Ports

______________________________________________________________________________________

Initiate a scan by writing a command byte to the conver-

sion register. The MAX1021/MAX1043 then power up,

scan all requested channels, store the results in the

FIFO, and shut down. After the scan is complete,

EOC is

pulled low and the results are available in the FIFO. If a

temperature measurement is requested, the tempera-

ture result precedes all other FIFO results. Temperature

results are available in 12-bit format.

EOC stays low until

CS is pulled low again. Wait until all conversions are

complete before reading the FIFO. SPI communications

to the DAC and GPIO registers are permitted during

conversion. However, coupled noise may result in

degraded ADC SNR.

Externally Clocked Acquisitions and

Conversions Using the Serial Interface

ADC Conversions in Clock Mode 11

In clock mode 11, acquisitions and conversions are

initiated by writing a command byte to the conversion

as the conversion clock. Scanning, averaging, and the

FIFO are disabled, and the conversion result is avail-

able at DOUT during the conversion. Output data is

updated on the rising edge of SCLK in clock mode 11.

See Figure 9 for clock mode 11 timing.

Initiate a conversion by writing a command byte to the

conversion register followed by 16 SCLK cycles. If

is pulsed high between the eighth and ninth cycles, the

pulse width must be less than 100µs. To continuously

convert at 16 cycles per conversion, alternate 1 byte of

(UP TO 514 INTERNALLY CLOCKED ACQUISITIONS AND CONVERSIONS)

DOUT

MSB1

tRDS

LSB1

MSB2

SCLK

CNVST

EOC

Figure 6. Clock Mode 00—After writing a command byte, set

CNVST low for at least 40ns to begin a conversion.

(CONVERSION 2)

tCSW

tDOV

(ACQUISITION 2)

(ACQUISITION 1)

(CONVERSION 1)

DOUT

MSB1

LSB1

MSB2

SCLK

CNVST

EOC

Figure 7. Clock Mode 01—After writing a command byte, request multiple conversions by setting

CNVST low for each conversion.

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