AD7691BRMZ datasheet(6/28 Pages) AD

Part #	AD7691BRMZ

Description	18-Bit, 1.5 LSB INL, 250 kSPS PulSAR Differential ADC in MSOP/QFN

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AD7691

Rev. 0 | Page 6 of 28

VDD = 2.3 V to 4.5 V, VIO = 2.3 V to VDD, VREF = VDD, all specifications TMIN to TMAX, unless otherwise noted.

Table 5. 1

Parameter

Symbol

Min

Typ

Max

Unit

Conversion Time: CNV Rising Edge to Data Available

tCONV

0.5

3.7

μs

Acquisition Time

tACQ

1.8

ns

Time Between Conversions

tCYC

5.5

μs

CNV Pulse Width (CS Mode)

tCNVH

10

ns

SCK Period (CS Mode)

tSCK

25

ns

SCK Period (Chain Mode)

tSCK

VIO Above 3 V

29

ns

VIO Above 2.7 V

35

ns

VIO Above 2.3 V

40

ns

SCK Low Time

tSCKL

12

ns

SCK High Time

tSCKH

12

ns

SCK Falling Edge to Data Remains Valid

tHSDO

5

ns

SCK Falling Edge to Data Valid Delay

tDSDO

VIO Above 3 V

24

ns

VIO Above 2.7 V

30

ns

VIO Above 2.3 V

35

ns

CNV or SDI Low to SDO D17 MSB Valid (CS Mode)

tEN

VIO Above 2.7 V

18

ns

VIO Above 2.3 V

22

ns

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

tDIS

25

ns

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

tSSDICNV

30

ns

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

tHSDICNV

0

ns

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

tSSCKCNV

5

ns

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

tHSCKCNV

8

ns

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

tSSDISCK

8

ns

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

tHSDISCK

10

ns

SDI High to SDO High (Chain Mode with Busy Indicator)

tDSDOSDI

36

1 See Figure 3 and Figure 4 for load conditions.

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