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AD7985BCPZ датащи(PDF) 6 Page - Analog Devices

номер детали AD7985BCPZ
подробное описание детали  16-Bit, 2.5 MSPS, PulSAR 15.5 mW ADC in LFCSP
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домашняя страница  http://www.analog.com
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Data Sheet
AD7985
Rev. C | 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
Test Conditions/Comments
Min
Typ
Max
Unit
Conversion Time: CNV Rising Edge
to Data Available
tCONV
Turbo mode/normal mode
320/420
ns
Acquisition Time
tACQ
80
ns
Time Between Conversions
tCYC
Turbo mode/normal mode
400/500
ns
CNV Pulse Width
tCNVH
CS mode
10
ns
Data Read During Conversion
tDATA
Turbo mode/normal mode
190/290
ns
Quiet Time During Acquisition from Last SCK
Falling Edge to CNV Rising Edge
tQUIET
20
ns
SCK Period
tSCK
CS mode
9
ns
tSCK
Chain mode
11
ns
SCK Low Time
tSCKL
3.5
ns
SCK High Time
tSCKH
3.5
ns
SCK Falling Edge to Data Remains Valid
tHSDO
2
ns
SCK Falling Edge to Data Valid Delay
tDSDO
4
ns
CNV or SDI Low to SDO D15 MSB Valid
tEN
5
ns
CNV or SDI High or Last SCK Falling Edge
to SDO High Impedance
tDIS
CS mode
8
ns
SDI Valid Setup Time from CNV Rising Edge
tSSDICNV
4
ns
SDI Valid Hold Time from CNV Rising Edge
tHSDICNV
CS mode
0
ns
tHSDICNV
Chain mode
0
ns
SCK Valid Setup Time from CNV Rising Edge
tSSCKCNV
Chain mode
5
ns
SCK Valid Hold Time from CNV Rising Edge
tHSCKCNV
Chain mode
5
ns
SDI Valid Setup Time from SCK Falling Edge
tSSDISCK
Chain mode
2
ns
SDI Valid Hold Time from SCK Falling Edge
tHSDISCK
Chain mode
3
ns
SDI High to SDO High
tDSDOSDI
Chain mode with busy indicator
15
ns
1
See Figure 2 and Figure 3 for load conditions.
500µA
IOL
500µA
IOH
1.4V
TO SDO
CL
20pF
Figure 2. Load Circuit for Digital Interface Timing
90% VIO
10% VIO
VIH1
VIL1
VIL1
VIH1
tDELAY
tDELAY
1MINIMUM VIH AND MAXIMUM VIL USED. SEE DIGITAL INPUTS
SPECIFICATIONS IN TABLE 3.
Figure 3. Voltage Levels for Timing


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