LTC6652 datasheet(37/50 Pages) LINER

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LTC2373-18

237318f

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

TiMing DiagraMs

Figure 25. Using a Single LTC2373-18 without Programming the Sequencer

Single Device, Sequencer Not Programmed

RDL enables or disables the serial data I/O bus. If RDL is

high, the serial data I/O bus is disabled and the serial shift

clock SCK is ignored. If RDL is low, SDO is driven and

serial input data may be shifted in at SDI. Figure 25 shows

a single LTC2373-18 operated with RDL and RESET tied

to ground. With RDL grounded, the serial data I/O bus is

enabled and the MSB(D17) of the new conversion data is

availableatthefallingedgeofBUSY.Thestart-of-sequence

(SOS) bit followed by the current configuration is shifted

out after the conversion data.

Bringing SDI low during data readback as shown closes

the sequencer programming window at the first rising

edge of SCK after the falling edge of BUSY since C[7] = 0.

As a result, the sequencer is not programmed.

CNV

RDL = 0

RESET = 0

NAP AND

ACQUIRE

CONVERT

NAP AND ACQUIRE

BUSY

tCNVH

tCONV

tBUSYLH

SCK

SDO

237318 F25

D17

D16

D15

SOS

tDSDO

tHSDO

tSCK

A[3] A[2] A[1]

A[0] R[1] R[0] SEL

SDI

tQUIET

tCNVL

tCYC

tACQ

tACQ = tCYC – tCONV – tBUSYLH

tDSDOBUSYL

tSCKH

tSCKL

CONVERT

DIGITAL HOST

IRQ

DATA IN

SDI

CLK

CNV

BUSY

SDO

SDI

SCK

RDL

RESET

LTC2373-18

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