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AD7942BCPZRL7 Arkusz danych(PDF) 7 Page - Analog Devices

Numer części AD7942BCPZRL7
Szczegółowy opis  Pseudo Differential ADC in MSOP/LFCSP
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Strona internetowa  http://www.analog.com
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AD7942
Data Sheet
Rev. C | Page 6 of 24
VDD = 2.3 V to 4.5 V1, VIO = 2.3 V to 4.5 V or VDD + 0.3 V, whichever is the lowest, unless otherwise stated, TA = −40°C to +85°C.
Table 4.
Parameter
Symbol
Min
Typ
Max
Unit
Conversion Time: CNV Rising Edge to Data Available
tCONV
0.7
3.2
μs
Acquisition Time
tACQ
1.8
μs
Time Between Conversions
tCYC
5
μs
CNV Pulse Width (CS Mode)
tCNVH
10
ns
SCK Period (CS Mode)
tSCK
25
ns
SCK Period (Chain Mode)
tSCK
VIO ≥ 3 V
29
ns
VIO ≥ 2.7 V
35
ns
VIO ≥ 2.3 V
40
ns
SCK Low Time
tSCKL
12
ns
SCK High Time
tSCKH
12
ns
SCK Falling Edge to Data Remains Valid
tHSDO
5
ns
SCK Falling Edge to Data Valid Delay
tDSDO
VIO ≥ 3 V
24
ns
VIO ≥ 2.7 V
30
ns
VIO ≥ 2.3 V
35
ns
CNV or SDI Low to SDO D13 MSB Valid (CS Mode)
tEN
VIO ≥ 2.7 V
18
ns
VIO ≥ 2.3 V
22
ns
CNV or SDI High or Last SCK Falling Edge to SDO High Impedance (CS Mode)
tDIS
25
ns
SDI Valid Setup Time from CNV Rising Edge (CS Mode)
tSSDICNV
30
ns
SDI Valid Hold Time from CNV Rising Edge (CS Mode)
tHSDICNV
0
ns
SCK Valid Setup Time from CNV Rising Edge (Chain Mode)
tSSCKCNV
5
ns
SCK Valid Hold Time from CNV Rising Edge (Chain Mode)
tHSCKCNV
8
ns
SDI Valid Setup Time from SCK Falling Edge (Chain Mode)
tSSDISCK
5
ns
SDI Valid Hold Time from SCK Falling Edge (Chain Mode)
tHSDISCK
4
ns
SDI High to SDO High (Chain Mode with Busy Indicator)
tDSDOSDI
36
ns
1 See Figure 2 and Figure 3 for load conditions.
Timing Diagrams
500µA
IOL
500µA
IOH
1.4V
TO SDO
CL
50pF
Figure 2. Load Circuit for Digital Interface Timing
30% VIO
70% VIO
2V OR VIO – 0.5V1
0.8V OR 0.5V2
0.8V OR 0.5V2
2V OR VIO – 0.5V1
tDELAY
tDELAY
NOTES
1 2V IF VIO ABOVE 2.5V, VIO – 0.5V IF VIO BELOW 2.5V.
2 0.8V IF VIO ABOVE 2.5V, 0.5V IF VIO BELOW 2.5V.
Figure 3. Voltage Reference Levels for Timing


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