Datasheet

Data Sheet AD7988-1/AD7988-5
Rev. D | Page 5 of 24
TIMING SPECIFICATIONS
VDD = 2.37 V to 2.63 V, VIO = 3.3 V to 5.5 V, −40°C to +125°C unless otherwise stated. See Figure 2 and Figure 3 for load conditions.
Table 4.
Parameter Symbol Min Typ Max Unit
AD7988-1
Throughput Rate 100 kHz
Conversion Time: CNV Rising Edge to Data Available t
CONV
9.5 μs
Acquisition Time t
ACQ
500 ns
Time Between Conversions t
CYC
10 μs
AD7988-5
Throughput Rate 500 kHz
Conversion Time: CNV Rising Edge to Data Available t
CONV
1.6 μs
Acquisition Time t
ACQ
400 ns
Time Between Conversions t
CYC
2 μs
CNV Pulse Width (CS Mode)
t
CNVH
500 ns
SCK Period (CS Mode)
t
SCK
VIO Above 4.5 V 10.5 ns
VIO Above 3 V 12 ns
VIO Above 2.7 V 13 ns
VIO Above 2.3 V 15 ns
SCK Period (Chain Mode)
t
SCK
VIO Above 4.5 V 11.5 ns
VIO Above 3 V 13 ns
VIO Above 2.7 V 14 ns
VIO Above 2.3 V 16 ns
SCK Low Time t
SCKL
4.5 ns
SCK High Time
t
SCKH
4.5
ns
SCK Falling Edge to Data Remains Valid t
HSDO
3 ns
SCK Falling Edge to Data Valid Delay t
DSDO
VIO Above 4.5 V 9.5 ns
VIO Above 3 V 11 ns
VIO Above 2.7 V 12 ns
VIO Above 2.3 V 14 ns
CNV or SDI Low to SDO D15 MSB Valid (CS Mode)
t
EN
VIO Above 3 V 10 ns
VIO Above 2.3V 15 ns
CNV or SDI High or Last SCK Falling Edge to SDO High Impedance (CS Mode)
t
DIS
20 ns
SDI Valid Setup Time from CNV Rising Edge
t
SSDICNV
5
ns
SDI Valid Hold Time from CNV Rising Edge (CS Mode)
t
HSDICNV
2 ns
SDI Valid Hold Time from CNV Rising Edge (Chain 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
2 ns
SDI Valid Hold Time from SCK Falling Edge (Chain Mode) t
HSDISCK
3 ns