Datasheet

AD7887
Rev. D | Page 16 of 24
SCLK
CS
DOUT
DIN
THE PART POWERS UP FROM
SHUTDOWN ON SCLK FALLING EDGE AS
PM1 = 1 AND PM0 = 0
1
16
1
16
2
t
10
= 5µs
THE PART ENTERS
SHUTDOWN AT THE END OF
CONVERSION AS PM1 = 1 AND PM0 = 0
CONTROL REGISTER DATA IS LOADED ON THE
FIRST EIGHT CLOCKS. PM1 = 1 AND PM0 = 0
PM1 = 1 AND PM0 = 0 TO KEEP THE
PART IN THIS MODE
DATA IN
DATA IN
FOUR LEADING ZEROS + CONVERSION RESULT
FOUR LEADING ZEROS + CONVERSION RESULT
0
6191-018
Figure 18. Mode 3 Operation (Microcontroller for Slow SCLKs)
SCLK
CS
DOUT
DIN
1
168
1
168
1
16
8
PM1 = 0 AND PM0 = 1 TO PLACE
THE PART IN NORMAL MODE
PM1 = 1 AND PM0 = 0 TO PLACE
THE PART BACK IN MODE 3
CONTROL REGISTER DATA IS LOADED ON
THE FIRST EIGHT CLOCKS. PM1 = 1 AND PM0 = 0
THE PART ENTERS
SHUTDOWN AT THE END
OF CONVERSION AS
PM1 = 1 AND PM0 = 0
THE PART REMAINS POWERED UP
AS PM1 = 0 AND PM0 = 1
THE PART BEGINS TO POWER
UP FROM SHUTDOWN
THE PART ENTERS
SHUTDOWN AT THE END OF
CONVERSION AS PM1 = 1
AND PM0 = 0
DATA IN
DATA IN
FOUR LEADING ZEROS
+ CONVERSION RESULT
FOUR LEADING ZEROS
+ CONVERSION RESULT
FOUR LEADING ZEROS
+ CONVERSION RESULT
DATA IN
0
6191-019
Figure 19. Mode 3 Operation (Microcontroller for High Speed SCLKs)
SCLK
CS
DOUT
DIN
CONTROL REGISTER DATA IS LOADED ON
THE FIRST EIGHT CLOCKS. PM1 = 1 AND PM0 = 1
1
16
PM1 = 1 AND PM0 = 1 TO KEEP
THE PART IN THIS MODE
1
16
THE PART POWERS UP
FROM STANDBY ON SCLK
FALLING EDGE AS PM1 = 1
AND PM0 = 1
THE PART ENTERS
STANDBY AT THE END OF
CONVERSION AS
PM1 = 1 AND PM0 = 1
FOUR LEADING ZEROS + CONVERSION RESULT
DATA IN
FOUR LEADING ZEROS + CONVERSION RESULT
DATA IN
0
6191-020
Figure 20. Mode 4 Operation