LTC6652 datasheet(38/50 Pages) LINER

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LTC2373-18

237318f

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

TiMing DiagraMs

Single Device, Sequencer Programmed

Figure 26 shows the timing for a single device being

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 available at the

falling edge of BUSY. The start-of-sequence (SOS) bit

followed by the configuration used for the conversion just

performed is shifted out after the new conversion data.

When SDI is high at the first rising edge of SCK after

the falling edge of BUSY as shown, the sequencer pro-

gramming window stays open, allowing the sequencer to

beprogrammed.Withthesequencerprogrammingwindow

open, a valid input configuration is detected on the 8th

rising edge of SCK. At this point, the MUX turns OFF and

resets and sequencer memory is reset and updated with

the new configuration. The new channel configuration is

applied when the MUX turns ON, marking the beginning

of a new acquisition period.

‘On the Fly’ Device Programming

The sequencer may be programmed with one control

word as shown in Figure 26 every conversion cycle to

achieve complete flexibility in the multiplexer configura-

tion, input range and digital gain compression setting on

each conversion.

Figure 26. Using a Single LTC2373-18 Programming the Sequencer

CNV

RDL = 0

RESET = 0

NAP

BUSY

tCNVH

tCONV

CONVERT

NAP

tBUSYLH

SCK

SDO

237318 F26

D17

D16

D15

D13

D14

D12

D11

D10

R[1] R[0] SEL

tQUIET

tSCK

tCNVL

tVLDMRST + tMRST2 + tACQ

CONVERT

tDSDOBUSYL

tHSDISCK

tSSDISCK

tSCKL

tSCKH

tDSDO

tHSDO

SDI

C[7]

C[6] C[5] C[4]

C[3]

C[2] C[1] C[0]

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