LTC2630 datasheet(40/50 Pages) LINER

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LTC2373-18

237318f

For more information www.linear.com/LTC2373-18

Sleep Mode

The LTC2373-18 automatically naps and starts acquiring

the input once a conversion has completed. Only the ADC

core powers down in nap mode. As a result, the auto nap

feature provides limited power savings. To obtain greater

power savings, the LTC2373-18 provides a sleep mode.

Duringsleepmode,theentirepartispowereddownexcept

for a small standby current resulting in a 300μW power

dissipation. To enter sleep mode, toggle CNV twice with no

intervening rising edge on SCK as shown in Figure 28. The

part will enter sleep mode on the falling edge of BUSY from

the last conversion initiated. Once in sleep mode, a rising

edge on SCK will wake the part up. Upon emerging from

sleep mode, wait tWAKE ms before initiating a conversion

to allow the reference and reference buffer to wake-up and

charge the bypass capacitors at REFIN and REFBUF. The

serial data I/O bus is enabled or disabled by RDL during

sleep mode. Sleep mode does not affect the state of the

sequencer memory or memory pointer.

TiMing DiagraMs

Figure 28. Sleep Mode Timing Diagram

CNV

RDL = DON’T CARE

SDI = DON’T CARE

BUSY

SCK

tCNVH

tCONV

CONVERT

NAP

SLEEP

tBUSYLH

CONVERT

NAP

tCONV

237318 F28

CNV

RDL = DON’T CARE

SDI = DON’T CARE

BUSY

SCK

tCNVH

tCONV

CONVERT

SLEEP

tBUSYLH

CONVERT

NAP

tWAKE

LTC2630 Datasheet(PDF) 40 Page - Linear Technology

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