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AD7982 Datasheet(PDF) 20 Page - Analog Devices

Part No. AD7982
Description  18-bit, 1 MSPS PulSAR ADC in MSOP/QFN
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7982 Datasheet(HTML) 20 Page - Analog Devices

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AD7982
Preliminary Technical Data
Rev PrC | Page 20 of 23
CHAIN MODE WITH BUSY INDICATOR
This mode can also be used to daisy chain multiple AD7982s on
a 3-wire serial interface while providing a BUSY indicator. 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 three AD7982s is shown
in Figure 26 and the corresponding timing is given in Figure 27.
When SDI and CNV are low, SDO is driven low. With SCK
high, a rising edge on CNV initiates a conversion, selects the
chain mode, and enables the BUSY indicator feature. In this
mode, CNV is held high during the conversion phase and the
subsequent data readback. When all ADCs in the chain have
completed their conversions, the nearend ADC ( ADC C in
Figure 26) SDO is driven high. This transition on SDO can be
used as a BUSY indicator to trigger the data readback controlled
by the digital host. The AD7982 then enters the acquisition
phase and powers down. The data bits stored in the internal
shift register are then clocked out, MSB first, 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 +
1 clocks are required to readback the N ADCs. Although the
rising edge can be used to capture the data, a digital host using
the SCK falling edge allows a faster reading rate and,
consequently more AD7982s in the chain, provided the digital
host has an acceptable hold time.
CNV
SCK
SDO
SDI
CLK
CONVERT
DATA IN
IRQ
DIGITAL HOST
C
CNV
SCK
SDO
SDI
B
CNV
SCK
SDO
SDI
A
AD7982
AD7982
AD7982
Figure 26. Chain Mode with BUSY Indicator Connection Diagram
SDOA = SDIB
DA17 DA16 DA15
SCK
123
39
53
54
tEN
CONVERSION
ACQUISITION
tCONV
tCYC
tACQ
ACQUISITION
CNV = SDIA
DA1
417
tSCK
tSCKH
tSCKL
DA0
19
38
18
SDOB = SDIC
DB17 DB16 DB15
DA1
DB1DB0DA17 DA16
55
tSSDISCK
tHSDISC
tHSDO
tDSDO
SDOC
DC17 DC16 DC15
DA1DA0
DC1DC0DA16
21
35
36
20
37
DB1DB0DA17
DB17 DB16
tDSDOSDI
tSSCKCNV
tHSCKCNV
DA0
tDSDOSDI
tDSDOSDI
tDSDOSDI
tDSDOSDI
Figure 27. Chain Mode with BUSY Indicator Serial Interface Timing


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