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AD7989-1 Datasheet(PDF) 19 Page - Analog Devices

No. de Pieza. AD7989-1
Descripción  PulSAR ADCs in MSOP/LFCSP
Descarga  24 Pages
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Fabricante  AD [Analog Devices]
Página de inicio  http://www.analog.com
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AD7989-1 Datasheet(HTML) 19 Page - Analog Devices

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Data Sheet
AD7989-1/AD7989-5
Rev. B | Page 19 of 24
CHAIN MODE
This mode can daisy-chain multiple AD7989-1/AD7989-5
devices on a 3-wire serial interface. This feature reduces
component count and wiring connections, for example, 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 AD7989-1/AD7989-5
devices is shown in Figure 35, and the corresponding timing is
given in Figure 36.
When SDI/CS and CNV are low, SDO is driven low. With SCK
low, a rising edge on CNV initiates a conversion, and selects the
chain mode.
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 AD7989-1/
AD7989-5 enter the acquisition phase and power down. The
remaining data bits stored in the internal shift register are
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 read back the N ADCs.
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 and, consequently, more AD7989-1/
AD7989-5 devices in the chain, provided that the digital host has
an acceptable hold time. The maximum conversion rate may be
reduced due to the total readback time.
Figure 35. Chain Mode Connection Diagram
Figure 36. Chain Mode Serial Interface Timing
CONVERT
DATA IN
CLK
DIGITAL HOST
AD7989-1/
AD7989-5
SDO
CNV
B
SCK
AD7989-1/
AD7989-5
SDO
CNV
A
SCK
SDI/CS
SDI/CS
DA17
DA16
DA15
SCK
123
34
35
36
tSSDISCK
tHSDISCK
tEN
CONVERSION
ACQUISITION
tCONV
tCYC
tACQ
ACQUISITION
CNV
DA1
16
17
tSCK
tSCKL
tSCKH
DA0
19
20
18
SDOB
DB17
DB16
DB15
DA1
DB1DB0DA17
DA16
tHSDO
tDSDO
tSSCKCNV
tHSCKCNV
DA0
SDI/CSA = 0
SDOA = SDI/CSB


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