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AD7980 Datasheet(PDF) 19 Page - Analog Devices

Part No. AD7980
Description  16-bit, 1 MSPS PulSAR ADC in MSOP/QFN
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD7980 Datasheet(HTML) 19 Page - Analog Devices

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Preliminary Technical Data
AD7980
Rev Pr C | Page 19 of 22
CHAIN MODE WITH BUSY INDICATOR
This mode can also be used to daisy chain multiple AD7980s 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 AD7980s is shown
in Figure 25 and the corresponding timing is given in Figure 26.
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 25) 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 AD7980 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 16 × 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 AD7980s 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
AD7980
AD7980
AD7980
Figure 25. Chain Mode with BUSY Indicator Connection Diagram
SDOA = SDIB
DA15 DA14 DA13
SCK
123
35
47
48
tEN
CONVERSION
ACQUISITION
tCONV
tCYC
tACQ
ACQUISITION
CNV = SDIA
DA1
415
tSCK
tSCKH
tSCKL
DA0
17
34
16
SDOB = SDIC
DB15 DB14 DB13
DA1
DB1DB0DA15 DA14
49
tSSDISCK
tHSDISC
tHSDO
tDSDO
SDOC
DC15 DC14 DC13
DA1DA0
DC1DC0DA14
19
31
32
18
33
DB1DB0DA15
DB15 DB14
tDSDOSDI
tSSCKCNV
tHSCKCNV
DA0
tDSDOSDI
tDSDOSDI
tDSDOSDI
tDSDOSDI
Figure 26. Chain Mode with BUSY Indicator Serial Interface Timing


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