Data Sheet

AD7988-1/AD7988-5

Rev. B | Page 5 of 24

TIMING SPECIFICATIONS

VDD = 2.37 V to 2.63 V, VIO = 3.3 V to 5.5 V, −40°C to +125°C unless otherwise stated. See Figure 2 and Figure 3 for load conditions.

Table 4.

Parameter

Symbol

Min

Typ

Max

Unit

AD7988-1

Throughput Rate

100

kHz

Conversion Time: CNV Rising Edge to Data Available

9.5

μs

Acquisition Time

500

ns

Time Between Conversions

10

μs

AD7988-5

Throughput Rate

500

kHz

Conversion Time: CNV Rising Edge to Data Available

1.6

μs

Acquisition Time

400

ns

Time Between Conversions

2

μs

CNV Pulse Width (CS Mode)

500

ns

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

CNV or SDI Low to SDO D15 MSB Valid (CS Mode)

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

5

ns

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

2

ns

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

0

ns

SCK Valid Setup Time from CNV Rising Edge (Chain Mode)

5

ns

SCK Valid Hold Time from CNV Rising Edge (Chain Mode)

5

ns

SDI Valid Setup Time from SCK Falling Edge (Chain Mode)

2

ns

SDI Valid Hold Time from SCK Falling Edge (Chain Mode)

3

ns