MX574ASD datasheet(10/18 Pages) MAXIM

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Timing and Control

Convert Start Timing—Full Control Mode

R/C must be low before asserting both CE and CS. If it

is high, a brief read operation occurs possibly resulting in

system bus contention. To initiate a conversion, use either

CE or CS. CE is recommended since it is shorter by one

propagation delay than CS and is the faster input of the

two. CE is used to begin the conversion in Figure 4.

The STS output is high during the conversion indicating

the ADC is busy. During this period, additional convert

start commands will be ignored, so that the conversion

cannot be prematurely terminated or restarted. However,

if the state of A0 is changed after the beginning of the

conversion, any additional start conversion transitions will

latch the new state of A0, possibly resulting in an incorrect

conversion length (8 bits vs. 12 bits) for that conversion.

Read Timing—Full Control Mode

Figure 5 illustrates the read-cycle timing. While reading

data, access time is measured from when CE and R/C

are both high. Access time is extended 10ns if CS is used

to initiate a read.

Figure 4. Convert Start Timing

Figure 5. Read Timing

tHSC

tHEC

STS

D0–D11

tSSC

tHRC

tSRC

tHAC

tDSC

tSAC

HIGH IMPEDANCE

R/C

tSSR

tSRR

tSAR

tHAR

tHRR

tHSR

HIGH IMPEDANCE

tDD

tHD,tHL

STS

D0–D11

R/C

MAX174/MX574A/

MX674A

Industry-Standard, Complete 12-Bit ADCs

www.maximintegrated.com

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