AD7887ARM datasheet(16/24 Pages) AD

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AD7887

Rev. D | Page 16 of 24

SCLK

DOUT

DIN

THE PART POWERS UP FROM

SHUTDOWN ON SCLK FALLING EDGE AS

PM1 = 1 AND PM0 = 0

t10 = 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

FOUR LEADING ZEROS + CONVERSION RESULT

Figure 18. Mode 3 Operation (Microcontroller for Slow SCLKs)

SCLK

DOUT

DIN

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

FOUR LEADING ZEROS

+ CONVERSION RESULT

FOUR LEADING ZEROS

+ CONVERSION RESULT

FOUR LEADING ZEROS

+ CONVERSION RESULT

DATA IN

Figure 19. Mode 3 Operation (Microcontroller for High Speed SCLKs)

SCLK

DOUT

DIN

CONTROL REGISTER DATA IS LOADED ON

THE FIRST EIGHT CLOCKS. PM1 = 1 AND PM0 = 1

PM1 = 1 AND PM0 = 1 TO KEEP

THE PART IN THIS MODE

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

Figure 20. Mode 4 Operation

AD7887ARM 数据表(PDF) 16 Page - Analog Devices

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