Datasheet

AD7946
Rev. A | Page 5 of 24
TIMING SPECIFICATIONS
T
A
= −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 t
CONV
0.5 1.6 μs
Acquisition Time t
ACQ
400 ns
Time Between Conversions t
CYC
2 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
5 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 D15 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
5 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