Data Sheet

AD7989-1/AD7989-5

Rev. B | Page 5 of 24

TIMING SPECIFICATIONS

Table 4.

Parameter

Symbol

Min

Typ

Max

Unit

THROUGHPUT RATE

AD7989-1

100

kSPS

AD7989-5

500

kSPS

CONVERSION AND ACQUISITION TIMES

Conversion Time: CNV Rising Edge to Data Available

AD7989-1

9500

ns

AD7989-5

1600

ns

Acquisition Time

AD7989-1

500

ns

AD7989-5

400

ns

Time Between Conversions

AD7989-1

10

μs

AD7989-5

2

μs

CNV PULSE WIDTH (CS MODE)

500

ns

SCK

SCK Period (CS Mode)

VIO Above 4.5 V

10.5

ns

VIO Above 3 V

12

ns

VIO Above 2.7 V

13

ns

VIO Above 2.3 V

15

ns

SCK Period (Chain Mode)

VIO Above 4.5 V

11.5

ns

VIO Above 3 V

13

ns

VIO Above 2.7 V

14

ns

VIO Above 2.3 V

16

ns

SCK Low Time

4.5

ns

SCK High Time

4.5

ns

SCK Falling Edge to Data Remains Valid

3

ns

SCK Falling Edge to Data Valid Delay

VIO Above 4.5 V

9.5

ns

VIO Above 3 V

11

ns

VIO Above 2.7 V

12

ns

VIO Above 2.3 V

14

ns

CS MODE

CNV or SDI Low to SDO D17 MSB Valid

VIO Above 3 V

10

ns

VIO Above 2.3V

15

ns

CNV or SDI High or Last SCK Falling Edge to SDO High Impedance (CS Mode)

20

ns

SDI Valid Setup Time from CNV Rising Edge (CS Mode)

5

ns

SDI Valid Hold Time from CNV Rising Edge (CS Mode)

2

ns

CHAIN MODE

SCK Valid Setup Time from CNV Rising Edge

5

ns

SCK Valid Hold Time from CNV Rising Edge

5

ns

SDI Valid Setup Time from SCK Falling Edge

2

ns

SDI Valid Hold Time from SCK Falling Edge

3

ns