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AD7949 データシート(PDF) 6 Page - Analog Devices

部品番号 AD7949
部品情報  16-Bit, 8-Channel, 250 kSPS PulSAR짰 ADC.
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

AD7949 データシート(HTML) 6 Page - Analog Devices

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AD7689
Preliminary Technical Data
Rev. PrC | Page 6 of 20
VDD = 2.5 V to 4.5 V, VIO = 2.3 V to VDD, all specifications TMIN to TMAX, unless otherwise noted.
Table 5. 1
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
tCNVH
10
ns
SCK Period
tSCK
25
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 Above 3 V
24
ns
VIO Above 2.7 V
30
ns
VIO Above 2.3 V
35
ns
CNV Low to SDO D15 MSB Valid
tEN
VIO Above 2.7 V
18
ns
VIO Above 2.3 V
22
ns
CNV High or Last SCK Falling Edge to SDO High Impedance
tDIS
25
ns
CNV High to SCK Low
tCSCK
10
ns
SDI Valid Setup Time from SCK Falling Edge
tSDIN
5
ns
SDI Valid Hold Time from SCK Falling Edge
tHDIN
4
ns
1 See Figure 2 and Figure 3 for load conditions.
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
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 Levels for Timing


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