Datasheet

Data Sheet AD7691
Rev. C | Page 5 of 28
TIMING SPECIFICATIONS
VDD = 4.5 V to 5.25 V, VIO = 2.3 V to VDD, V
REF
= VDD, all specifications T
MIN
to T
MAX
, unless otherwise noted.
1
Table 4.
Parameter Symbol Min Typ Max Unit
Conversion Time: CNV Rising Edge to Data Available t
CONV
0.5 2.2 µs
Acquisition Time t
ACQ
1.8 µs
Time Between Conversions t
CYC
4 µs
CNV Pulse Width (CS Mode)
t
CNVH
10 ns
SCK Period (CS Mode)
t
SCK
15 ns
SCK Period (Chain Mode) t
SCK
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 Low Time t
SCKL
7 ns
SCK High Time t
SCKH
7 ns
SCK Falling Edge to Data Remains Valid t
HSDO
4 ns
SCK Falling Edge to Data Valid Delay t
DSDO
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 D17 MSB Valid (CS Mode)
t
EN
VIO Above 4.5 V 15 ns
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)
t
DIS
25 ns
SDI Valid Setup Time from CNV Rising Edge (CS Mode)
t
SSDICNV
15 ns
SDI Valid Hold Time from CNV Rising Edge (CS Mode)
t
HSDICNV
0 ns
SCK Valid Setup Time from CNV Rising Edge (Chain Mode) t
SSCKCNV
5 ns
SCK Valid Hold Time from CNV Rising Edge (Chain Mode) t
HSCKCNV
10 ns
SDI Valid Setup Time from SCK Falling Edge (Chain Mode) t
SSDISCK
3 ns
SDI Valid Hold Time from SCK Falling Edge (Chain Mode) t
HSDISCK
4 ns
SDI High to SDO High (Chain Mode with Busy Indicator) t
DSDOSDI
VIO Above 4.5 V 15 ns
VIO Above 2.3 V 26 ns
1
See Figure 3 and Figure 4 for load conditions.