AD7690 datasheet(6/25 Pages) AD

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Data Sheet

AD7690

TIMING SPECIFICATIONS

VDD = 4.75 V to 5.25 V, VIO = 2.3 V to VDD, VREF = VDD, all specifications TMIN to TMAX, unless otherwise noted.

Table 4.1

Parameter

Symbol

Min

Typ

Max

Unit

Conversion Time: CNV Rising Edge to Data Available

tCONV

0.5

2.1

µs

Acquisition Time

tACQ

400

Time Between Conversions

tCYC

2.5

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 D17 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

See Figure 3 and Figure 4 for load conditions.

Figure 3. Load Circuit for Digital Interface Timing

Figure 4. Voltage Levels for Timing

500

µA

IOL

500

µA

IOH

1.4V

TO SDO

50pF

30% VIO

70% VIO

2V OR VIO – 0.5V1

0.8V OR 0.5V2

2V OR VIO – 0.5V1

tDELAY

NOTES:

1. 2V IF VIO ABOVE 2.5V, VIO – 0.5V IF VIO BELOW 2.5V.

2. 0.8V IF VIO ABOVE 2.5V, 0.5V IF VIO BELOW 2.5V.

Rev. C | Page 5 of 24

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