AD7904 Analog Devices, AD7904 Datasheet - Page 24

• Manufacturer Part Number: AD7904
• Description: 4-Channel, 1 MSPS, 8-Bit A/D Converter with Sequencer in 16-Lead TSSOP
• Manufacturer: Analog Devices

Specifications of AD7904

• Resolution (bits): 8bit
• # Chan: 4
• Sample Rate: 1MSPS
• Interface: Ser,SPI
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref),Uni (Vref) x 2
• Adc Architecture: SAR
• Pkg Type: SOP

AD7904/AD7914/AD7924
DOUT
DOUT
SCLK
SCLK
DIN
DIN
CS
CS
PART IS IN
UNKNOWN MODE
AFTER POWER-ON
PART IS IN
UNKNOWN MODE
AFTER POWER-ON
DIN LINE HIGH FOR FIRST DUMMY CONVERSION
1
1
DIN LINE HIGH FOR FIRST DUMMY CONVERSION
Figure 25. Placing the AD7904/AD7914/AD7924 into Auto Shutdown Mode After Supplies Are First Applied
Figure 24. Placing the AD7904/AD7914/AD7924 into Full Shutdown Mode After Supplies Are First Applied
Figure 23. Placing the AD7904/AD7914/AD7924 into Normal Mode After Supplies Are First Applied
DOUT
SCLK
INVALID DATA
INVALID DATA
DIN
CS
PART IS IN
UNKNOWN MODE
AFTER POWER-ON
IF IN SHUTDOWN AT POWER-ON,
PART BEGINS TO POWER UP ON
CS RISING EDGE AS PM1 = PM0 = 1
CONTROL REGISTER IS LOADED ON
THE FIRST 12 CLOCKS. PM1 = 1, PM0 = 0
1
14
14
DATA IN TO CONTROL REGISTER
Rev. B | Page 24 of 32
16
16
INVALID DATA
t
12
PART ENTERS SHUTDOWN ON
CS RISING EDGE AS PM1 = 1, PM0 = 0
ALLOW
TO KEEP THE PART IN NORMAL MODE, LOAD
PM1 = PM0 = 1 IN CONTROL REGISTER
CONTROL REGISTER IS LOADED ON THE
FIRST 12 CLOCKS. PM1 = 0, PM0 = 1
1
1
CHANNEL IDENTIFIER BITS + CONVERSION RESULT
t
POWER
14
TO ELAPSE
16
DATA IN TO CONTROL REGISTER
DATA IN TO CONTROL REGISTER
INVALID DATA
PART ENTERS AUTO SHUTDOWN ON
CS RISING EDGE AS PM1 = 0, PM0 = 1
14
14
16
16