AD7922 Analog Devices, AD7922 Datasheet - Page 21

• Manufacturer Part Number: AD7922
• Description: 2-Channel, 2.35 V to 5.25 V, 1 MSPS, 12-Bit A/D Converter
• Manufacturer: Analog Devices

Specifications of AD7922

• Resolution (bits): 12bit
• # Chan: 2
• Sample Rate: 1MSPS
• Interface: Ser,SPI
• Analog Input Type: SE-Uni
• Ain Range: Uni Vdd
• Adc Architecture: SAR
• Pkg Type: SOP,SOT

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