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AD7989-1 Datasheet(PDF) 18 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) 18 Page - Analog Devices

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AD7989-1/AD7989-5
Data Sheet
Rev. B | Page 18 of 24
CS MODE, 4-WIRE
This mode is usually used when multiple AD7989-1/AD7989-5
devices are connected to an SPI-compatible digital host.
A connection diagram example using two AD7989-1/AD7989-5
devices is shown in Figure 33, and the corresponding timing is
given in Figure 34.
With SDI high, a rising edge on CNV initiates a conversion,
selects SDI/CS mode, and forces SDO to high impedance. In
this mode, CNV must be held high during the conversion phase
and the subsequent data readback. If SDI/CS and CNV are low,
SDO is driven low.
Prior to the minimum conversion time, SDI/CS can select other
SPI devices, such as analog multiplexers, but SDI/CS must be
returned high before the minimum conversion time elapses and
then held high for the maximum possible conversion time.
When the conversion is complete, the AD7989-1/AD7989-5
enter the acquisition phase and power down. Each ADC result
can be read by bringing its SDI/CS input low, which consequently
outputs the MSB onto SDO. The remaining data bits are then
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 18th SCK
falling edge or when SDI/CS goes high (whichever occurs first),
SDO returns to high impedance and another AD7989-1/AD7989-5
can be read.
Figure 33. CS Mode, 4-Wire Connection Diagram
Figure 34. CS Mode, 4-Wire Serial Interface Timing
AD7989-1/
AD7989-5
SDO
CNV
SCK
CONVERT
DATA IN
CLK
DIGITAL HOST
CS1
CS2
AD7989-1/
AD7989-5
SDO
CNV
SCK
SDI/CS
SDI/CS
SDO
D17
D16
D15
D1
D0
tDIS
SCK
12
3
34
35
36
tHSDO
tDSDO
tEN
CONVERSION
ACQUISITION
tCONV
tCYC
tACQ
ACQUISITION
CNV
tSSDICNV
tHSDICNV
D1
16
17
tSCK
tSCKL
tSCKH
D0
D17
D16
19
20
18
SDI/CS (CS1)
SDI/CS (CS2)


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