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AD4000 Datasheet(PDF) 29 Page - Analog Devices

Part # AD4000
Description  Precision, Pseudo Differential, SAR ADCs
Download  36 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD4000 Datasheet(HTML) 29 Page - Analog Devices

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Data Sheet
AD4000/AD4004/AD4008
Rev. C | Page 29 of 36
CS MODE, 3-WIRE WITHOUT BUSY INDICATOR
This mode is typically used when a single AD4000/AD4004/
AD4008 device is connected to an SPI-compatible digital host.
The connection diagram is shown in Figure 52, and the
corresponding timing diagram is shown in Figure 53.
With SDI tied to VIO, a rising edge on CNV initiates a
conversion, selects the CS mode, and forces SDO to high
impedance. After a conversion is initiated, it continues until
completion irrespective of the state of CNV. This feature can be
useful, for instance, to bring CNV low to select other SPI
devices, such as analog multiplexers; however, CNV must be
returned high before the minimum conversion time elapses and
then held high for the maximum possible conversion time to
avoid the generation of the busy signal indicator.
When the conversion is complete, the AD4000/AD4004/AD4008
enter the acquisition phase and power down. When CNV goes
low, the MSB is output onto SDO. The remaining data bits are
clocked by subsequent SCK falling edges. The data is valid on
both SCK edges. Although the rising edge can capture the data,
a digital host using the SCK falling edge allows a faster reading
rate, provided it has an acceptable hold time. After the 16th SCK
falling edge or when CNV goes high (whichever occurs first),
SDO returns to high impedance.
There must not be any digital activity on SCK during the
conversion.
AD4000/
AD4004/
AD4008
SDI
SDO
CNV
SCK
CONVERT
DATA IN
CLK
DIGITAL HOST
VIO
Figure 52. CS Mode, 3-Wire Without Busy Indicator Connection Diagram (SDI High)
SDO
D15
D14
D13
D1
D0
tDIS
SCK
1
2
3
14
15
16
tSCK
tSCKL
tSCKH
tHSDO
tDSDO
CNV
CONVERSION
ACQUISITION
tCYC
ACQUISITION
SDI = 1
tCNVH
tACQ
tEN
tQUIET2
tCONV
Figure 53. CS Mode, 3-Wire Without Busy Indicator Serial Interface Timing Diagram (SDI High)


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