AD7928(RevA) Ver la hoja de datos (PDF) - Analog Devices

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AD7928
(Rev.:RevA)

8-Channel, 1 MSPS, 8-/10-/12-Bit ADCs with Sequencer in 20-Lead TSSOP

Analog Devices 

AD7908/AD7918/AD7928

CS

t2

SCLK

tCONVERT

t6

1

2

3

4

5

6

t3

t4

t7

DOUT

DIN

ADD2 ADD1 ADD0

THREE-

STATE ZERO

3 IDENTIFICATION

t9

BITS

WRITE SEQ1 DONTC ADD2

DB7

ADD1

DB6

t10

ADD0

B

11

12

13

14

15

16

t5

t11

t8

tQUIET

DB0

ZERO ZERO ZERO

4 TRAILING ZEROS

ZERO

THREE-

STATE

CODING DONTC DONTC DONTC DONTC

Figure 17. AD7908 Serial Interface Timing Diagram

CS

t2

SCLK

tCONVERT

t6

1

2

3

4

5

6

t3

t4

t7

DOUT

DIN

ADD2 ADD1 ADD0

THREE-

STATE ZERO

3 IDENTIFICATION

t9

BITS

WRITE SEQ DONTC ADD2

DB9

ADD1

DB8

t10

ADD0

11

12

DB2

DB1

B

13

14

15

16

t5

t11

t8

tQUIET

DB0

ZERO ZERO

2 TRAILING ZEROS

THREE-

STATE

CODING DONTC DONTC DONTC DONTC

Figure 18. AD7918 Serial Interface Timing Diagram

CS

SCLK

tCONVERT

t2

t6

1

2

3

4

5

DOUT

DIN

t3

t7

t4

ADD2 ADD1 ADD0

THREE-

STATE

3 IDENTIFICATION BITS

ZERO t9

DB11 DB10

t10

WRITE SEQ DONTC ADD2 ADD1 ADD0

B

13

14

t5

DB2

DB1

tQUIET

15

16

t8

DB0

t11

THREE-

STATE

DONTC DONTC DONTC

Figure 19. AD7928 Serial Interface Timing Diagram

CS

tCONVERT

t2

t6

SCLK

1

2

3

4

5

t3

t4

t7

DOUT

ADD2 ADD1 ADD0

THREE-

STATE

3 IDENTIFICATION BITS

ZERO t9

DB11 DB10

t10

DIN

VIN0

VIN1

VIN2

VIN3

VIN4

VIN5

SEQUENCE 1

C

13

DB2

14

t5

DB1

15

16

t8

DB0

t11

THREE-

STATE

VIN5

VIN6

SEQUENCE 2

VIN7

Figure 20. AD7928 Writing to SHADOW Register Timing Diagram

–22–

REV. A

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