AD79821 datasheet(5/24 Pages) AD

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AD7946

Rev. A | Page 5 of 24

TIMING SPECIFICATIONS

TA = −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

tCONV

0.5

1.6

μs

Acquisition Time

tACQ

400

Time Between Conversions

tCYC

μs

CNV Pulse Width (CS Mode)

tCNVH

SCK Period (CS Mode)

tSCK

SCK Period (Chain Mode)

tSCK

VIO Above 4.5 V

VIO Above 3 V

VIO Above 2.7 V

VIO Above 2.3 V

SCK Low Time

tSCKL

SCK High Time

tSCKH

SCK Falling Edge to Data Remains Valid

tHSDO

SCK Falling Edge to Data Valid Delay

tDSDO

VIO Above 4.5 V

VIO Above 3 V

VIO Above 2.7 V

VIO Above 2.3 V

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

tEN

VIO Above 4.5 V

VIO Above 2.7 V

VIO Above 2.3 V

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

tDIS

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

tSSDICNV

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

tHSDICNV

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

tSSCKCNV

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

tHSCKCNV

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

tSSDISCK

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

tHSDISCK

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

tDSDOSDI

VIO Above 4.5 V

VIO Above 2.3 V

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