Datasheet

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, V
REF
= 4.096 V, T
A
= −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
1
See Figure 2 and Figure 3 for load conditions.
500µA I
OL
500µA I
OH
1.4V
TO SDO
C
L
20pF
07956-002
Figure 2. Load Circuit for Digital Interface Timing
90% VIO
10% VIO
V
IH
1
V
IL
1
V
IL
1
V
IH
1
t
DELAY
t
DELAY
1
MINIMUM V
IH
AND MAXIMUM V
IL
USED. SEE DIGITAL INPUTS
SPECIFICATIONS IN TABLE 3.
07956-003
Figure 3. Voltage Levels for Timing