LT6236 datasheet(35/50 Pages) LINER

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LTC2372-16

237216f

For more information www.linear.com/LTC2372-16

Figure 23. Sequencer Memory Before, During and After Programming

Figure 22. Sequencer Programmed with Two Control Words

Programming the Sequencer with Two Configurations

Figure 22 illustrates the sequencer memory being pro-

grammed while reading out a conversion result. C[7] of

the first two input control words is 1, so these control

words are valid and are written to sequencer memory

in succession. C[7] of the third control word is 0, so the

input transaction is terminated at this point. Since there

were only two valid control words entered, the sequencer

memory is programmed with a depth of two. Figure 23

shows the state of the sequencer memory before, dur-

ing and after the programming process. The first stored

configuration will instruct the converter to sample a fully

differential signal on the CH7+/CH6– pair with digital gain

compression disabled, and the second stored configura-

tion will instruct the converter to sample a unipolar signal

on the CH3/COM pair with digital gain compression dis-

abled. The converter will then alternate between the two

programmed configurations on successive conversions.

Note that configurations stored in sequencer memory are

retained until the power is cycled, the part is reset, or a

newseriesofconfigurationprogrammingwordsareinput.

applicaTions inForMaTion

SEQUENCER MEMORY

AFTER PROGRAMMING

1ST CONTROL WORD

SEQUENCER MEMORY

AFTER PROGRAMMING

2ND CONTROL WORD

MEMORY POINTER

LOCATION

....

C0[6:0] = 0111100

1ST CONVERSION

2ND CONVERSION

3RD CONVERSION

4TH CONVERSION

237216 F18b

C0[6:0] = 0111100

C1[6:0] = 1011000

SEQUENCER MEMORY

FROM PREVIOUS

PROGRAMMING

C0[6:0]

C1[6:0]

C2[6:0]

C3[6:0]

C4[6:0]

C5[6:0]

C6[6:0]

C7[6:0]

C8[6:0]

C9[6:0]

C10[6:0]

C11[6:0]

C12[6:0]

C13[6:0]

C14[6:0]

C15[6:0]

CNV

BUSY

RDL

SCK

C[7]

A[3]

C[7]

A[3]

A[2] A[1]

R[1]

A[0]

A[2] A[1]

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

SEL

R[0]

SEL

SDI

DON’T CARE

START OF NEW

TRANSACTION

WINDOW

TRANSACTION

WINDOW CLOSED

CONTROL WORD #1

CONTROL WORD #2

Hi-Z

1ST VALID CONTROL WORD ENTERED

SEQUENCER MEMORY CLEARED AND UPDATED

NEW CONFIGURATION APPLIED

NEW ACQUISITION PERIOD BEGINS

2ND VALID CONTROL WORD ENTERED

SEQUENCER MEMORY UPDATED

SDO

237216 F22

D15

D14

D13

D12

D11

D10

Hi-Z

S0S

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