AD7687

Data Sheet

Rev. E | Page 6 of 26

TIMING SPECIFICATIONS

−40°C to +85°C, VDD = 4.5 V to 5.5 V, VIO = 2.3 V to 5.5 V or VDD + 0.3 V, whichever is the lowest, unless otherwise stated.

See Figure 2 and Figure 3 for load conditions.

Table 4.

Parameter

Symbol

Min

Typ

Max

Unit

CONVERSION TIME: CNV RISING EDGE TO DATA AVAILABLE

0.5

2.2

µs

ACQUISITION TIME

1.8

µs

TIME BETWEEN CONVERSIONS

4

µs

CNV PULSE WIDTH (CS MODE)

10

ns

SCK PERIOD

CS Mode

15

ns

Chain Mode

VIO Above 4.5 V

17

ns

VIO Above 3 V

18

ns

VIO Above 2.7 V

19

ns

VIO Above 2.3 V

20

ns

SCK TIME

Low

7

ns

High

7

ns

SCK FALLING EDGE

To Data Remains Valid

5

To Data Valid Delay

VIO Above 4.5 V

14

ns

VIO Above 3 V

15

ns

VIO Above 2.7 V

16

ns

VIO Above 2.3 V

17

ns

CNV OR SDI

Low to SDO D15 MSB Valid (CS Mode)

VIO Above 4.5 V

15

ns

VIO Above 2.7 V

18

ns

VIO Above 2.3 V

22

ns

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

25

ns

SDI

Valid Setup Time from CNV Rising Edge (CS Mode)

15

ns

Valid Hold Time from CNV Rising Edge (CS Mode)

0

ns

Valid Setup Time from SCK Falling Edge (Chain Mode)

3

ns

Valid Hold Time from SCK Falling Edge (Chain Mode)

4

ns

High to SDO High (Chain Mode with BUSY indicator)

VIO Above 4.5 V

15

ns

VIO Above 2.3 V

26

ns

SCK

Valid Setup Time from CNV Rising Edge (Chain Mode)

5

ns

Valid Hold Time from CNV Rising Edge (Chain Mode)

5

ns