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AD7903BRQZ-RL7 Datasheet(PDF) 19 Page - Analog Devices

No. de pieza AD7903BRQZ-RL7
Descripción Electrónicos  Dual Differential 16-Bit, 1 MSPS PulSAR ADC 12.0 mW in QSOP
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AD7903BRQZ-RL7 Datasheet(HTML) 19 Page - Analog Devices

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AD7903
Data Sheet
Rev. B | Page 18 of 28
CS MODE
CS Mode, 3-Wire Interface Without Busy Indicator
CS mode, using a 3-wire interface without a busy indicator, is
usually used when a single AD7903 is connected to a SPI-
compatible digital host.
The connection diagram is shown in Figure 39, and the
corresponding timing diagram is shown in Figure 40.
With SDIx tied to VIOx, a rising edge on CNVx initiates a
conversion, selects CS mode, and forces SDOx to high
impedance. When a conversion is initiated, it continues until
completion, irrespective of the state of CNVx. This can be
useful, for instance, to bring CNVx low to select other SPI
devices, such as analog multiplexers.
However, to avoid generation of the busy signal indicator, CNVx
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 AD7903 enters the
acquisition phase and powers down. When CNVx goes low, the
MSB is automatically output onto SDOx. The remaining data bits
are clocked by subsequent SCKx falling edges. The data is valid on
both SCKx edges. Although the rising edge can be used to capture
the data, a digital host using the falling edge of SCKx allows a
faster reading rate, provided that it has an acceptable hold time.
After the 16th SCKx falling edge or when CNVx goes high
(whichever occurs first), SDOx returns to high impedance.
Figure 39. CS Mode, 3-Wire Interface Without Busy Indicator Connection Diagram (SDIx High)
Figure 40. CS Mode, 3-Wire Interface Without Busy Indicator Serial Interface Timing (SDI High)
AD7903
SDIx
SDOx
CNVx
SCKx
CONVERT
DATA IN
CLK
DIGITAL HOST
VIOx
SDIx = 1
tCNVH
tCONV
tCYC
CNVx
ACQUISITION
ACQUISITION
tACQ
tSCK
tSCKL
CONVERSION
SCKx
tEN
tHSDO
12
3
14
15
16
tDSDO
tDIS
tSCKH
SDOx
D15
D14
D13
D1
D0


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