AD7922_15 Datasheet, PDF (21/32 Pages) Analog Devices – 2-Channel, 2.35 V to 5.25 V, 1 MSPS, 10-/12-Bit ADCs

CS
1
SCLK
DIN
DOUT
DAISY-CHAIN CYCLE
10 12 14 16
1
AD7912/AD7922
NORMAL MODE
10 12 14 16
CH = STY
CHANNEL FOR NEXT CONVERSION
VALID DATA
CONVERSION RESULT
Figure 30. Exiting Daisy-Chain Mode with CH = STY in the DIN Pin
THE PART ENTERS
NORMAL MODE
CS
A₁
SCLK
10
13
16
NORMAL MODE
1
16
DIN
CHANNEL FOR NEXT CONVERSION
CHANNEL FOR NEXT CONVERSION
DOUT
INVALID DATA
CONVERSION RESULT
Figure 31. Exiting Daisy-Chain Mode
CONVERSION
CYCLE
NORMAL MODE
DOUT: CHN = MOD
CS HIGH BETWEEN
THE 10TH–13TH SCLK
CONVERSION CYCLE
CONVERSION CYCLE
DIN: CHN ≠ STY
DIN: CHN = STY
DAISY-CHAIN MODE
DOUT:CHN ≠ MOD
*CS HIGH BETWEEN
THE 10TH–12TH SCLK
CS HIGH BETWEEN
THE 2ND–10TH SCLK
POWER-UP TIME AND CS
HIGH AFTER THE 13TH SCLK
POWER-DOWN
MODE
CS HIGH BETWEEN
THE 2ND–10TH SCLK
POWER-UP TIME AND
CS HIGH BETWEEN
THE 10TH–12TH SCLK
*IF CS IS BROUGHT HIGH BETWEEN THE 10TH AND THE 12TH SCLK FALLING EDGE, THE DATA SHIFTED FROM ONE
ADC TO THE NEXT ONE IN THE CHAIN, WHILE THE PARTS ARE IN DAISY-CHAIN MODE, IS VALID DATA.
IF CS IS BROUGHT HIGH BETWEEN THE 12TH AND THE 13TH SCLK FALLING EDGE, THE DATA SHIFTED FROM ONE
ADC TO THE NEXT ONE IN THE CHAIN, WHILE THE PARTS ARE IN DAISY-CHAIN MODE, IS INVALID DATA.
Figure 32. Transitions between Modes of Operation
Rev. 0 | Page 21 of 32