參數(shù)資料
型號(hào): AD7946BCPRL7
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: 14-Bit, 500 kSPS PulSAR⑩ ADC in MSOP/QFN
中文描述: 1-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO10
封裝: 3 X 3 MM, QFN-10
文件頁(yè)數(shù): 13/27頁(yè)
文件大小: 301K
代理商: AD7946BCPRL7
AD7946
Preliminary Technical Data
Rev Pr D | Page 20 of 27
CS Mode 4-Wire, No BUSY Indicator
This mode is usually used when multiple AD7946s are
connected to an SPI compatible digital host.
A connection diagram example using two AD7946s 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 the 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 and CNV are low, SDO is
driven low). Prior to the minimum conversion time, SDI could
be used to select other SPI devices, such as analog multiplexers,
but SDI must be returned high before the minimum conversion
time and held high until the maximum conversion time to
avoid the generation of the BUSY signal indicator. When the
conversion is complete, the AD7946 enters the acquisition
phase and powers down. Each ADC result can be read by
bringing low its SDI input which consequently outputs the MSB
onto SDO. The remaining data bits are then clocked by
subsequent SCK driving edges. The data is valid on both SCK
edges. Although the nondriving edge can be used to capture the
data, a digital host also using the SCK falling edge will allow a
faster reading rate provided it has an acceptable hold time. After
the 14th SCK falling edge, or when SDI goes high, whichever is
earlier, SDO returns to high impedance and another AD7946
can be read.
CNV
SCK
SDO
SDI
DATA IN
CLK
CS1
CONVERT
CS2
DIGITAL HOST
AD7946
CNV
SCK
SDO
SDI
AD7946
Figure 33. CS Mode 4-Wire, No BUSY Indicator Connection Diagram
04656-P
rC-012
SDO
D13
D12
D11
D1
D0
tDIS
SCK
12
3
26
27
28
tHSDO
tDSDO
tEN
CONVERSION
ACQUISITION
tCONV
tCYC
tACQ
ACQUISITION
SDI(CS1)
CNV
tSSDICNV
tHSDICNV
D1
12
13
tSCK
tSCKL
tSCKH
D0
D13
D12
15
16
14
SDI(CS2)
Figure 34. CS Mode 4-Wire, No BUSY Indicator Serial Interface Timing
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