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AD7982 Datasheet(PDF) 19 Page - Analog Devices

Part No. AD7982
Description  18-bit, 1 MSPS PulSAR ADC in MSOP/QFN
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7982 Datasheet(HTML) 19 Page - Analog Devices

 
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Preliminary Technical Data
AD7982
Rev PrC | Page 19 of 23
CHAIN MODE, NO BUSY INDICATOR
This mode can be used to daisy chain multiple AD7982s on a 3-
wire serial interface. This feature is useful for reducing
component count and wiring connections, e.g., in isolated
multiconverter applications or for systems with a limited
interfacing capacity. Data readback is analogous to clocking a
shift register.
A connection diagram example using two AD7982s is shown in
Figure 24 and the corresponding timing is given in Figure 25.
When SDI and CNV are low, SDO is driven low. With SCK low,
a rising edge on CNV initiates a conversion, selects the chain
mode, and disables the BUSY indicator. In this mode, CNV is
held high during the conversion phase and the subsequent data
readback. When the conversion is complete, the MSB is output
onto SDO and the AD7982 enters the acquisition phase and
powers down. The remaining data bits stored in the internal
shift register are then clocked by subsequent SCK falling edges.
For each ADC, SDI feeds the input of the internal shift register
and is clocked by the SCK falling edge. Each ADC in the chain
outputs its data MSB first, and 18 × N clocks are required to
readback the N ADCs. The data is valid on both SCK edges.
Although the rising edge can be used to capture the data, a
digital host using the SCK falling edge will allow a faster
reading rate and, consequently more AD7982s in the chain,
provided the digital host has an acceptable hold time. The
maximum conversion rate may be reduced due to the total
readback time.
CNV
SCK
SDO
SDI
CLK
CONVERT
DATA IN
DIGITAL HOST
B
CNV
SCK
SDO
SDI
A
AD7982
AD7982
Figure 24. Chain Mode, No BUSY Indicator Connection Diagram
SDOA = SDIB
DA17
DA16
DA15
SCK
12
3
34
35
36
tSSDISCK
tHSDISC
tEN
CONVERSION
ACQUISITION
tCONV
tCYC
tACQ
ACQUISITION
CNV
DA1
16
17
tSCK
tSCKL
tSCKH
DA0
19
20
18
SDIA = 0
SDOB
DB17
DB16
DB15
DA1
DB1DB0DA17
DA16
tHSDO
tDSDO
tSSCKCNV
tHSCKCNV
DA0
Figure 25. Chain Mode, No BUSY Indicator Serial Interface Timing


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