
AD7986
Rev. B | Page 5 of 28
TIMING SPECIFICATIONS
AVDD = DVDD = 2.5 V, BVDD = 5 V, VIO = 1.8 V to 2.7 V, VREF = 4.096 V, TA = 40°C to +85°C, unless otherwise noted.1 Table 4.
Parameter
Symbol
Min
Typ
Max
Unit
Conversion Time: CNV Rising Edge to Data Available (Turbo Mode/Normal Mode)
t
CONV
400/500
ns
Acquisition Time
t
ACQ
100
ns
Time Between Conversions (Turbo Mode/Normal Mode)
t
CYC
500/660
ns
CNV Pulse Width (CS Mode)
t
CNVH
10
ns
Data Read During Conversion (Turbo Mode/Normal Mode)
t
DATA
200/300
ns
Quiet Time During Acquisition from Last SCK Falling Edge to CNV Rising Edge
t
QUIET
20
ns
SCK Period (CS Mode)
t
SCK
9
ns
SCK Period (Chain Mode)
t
SCK
11
ns
SCK Low Time
t
SCKL
3.5
ns
SCK High Time
t
SCKH
3.5
ns
SCK Falling Edge to Data Remains Valid
t
HSDO
2
ns
SCK Falling Edge to Data Valid Delay
t
DSDO
6
ns
CNV or SDI Low to SDO D17 MSB Valid (CS Mode)
t
EN
10
ns
CNV or SDI High or Last SCK Falling Edge to SDO High Impedance (CS Mode)
t
DIS
8
ns
SDI Valid Setup Time from CNV Rising Edge
t
SSDICNV
4
ns
SDI Valid Hold Time from CNV Rising Edge (CS Mode)
t
HSDICNV
0
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
SDI High to SDO High (Chain Mode with Busy Indicator)
t
DSDOSDI
5
ns
500A
IOL
500A
IOH
1.4V
TO SDO
CL
20pF
07956-
002
Figure 2. Load Circuit for Digital Interface Timing
90% VIO
10% VIO
VIH1
VIL1
VIH1
tDELAY
1MINIMUM VIH AND MAXIMUM VIL USED. SEE DIGITAL INPUTS
SPECIFICATIONS IN TABLE 3.
07956-
003
Figure 3. Voltage Levels for Timing