參數(shù)資料
型號(hào)： EVAL-AD7984SDZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 13/24頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL FOR AD7984
標(biāo)準(zhǔn)包裝： 1
系列： PulSAR®
ADC 的數(shù)量： 1
位數(shù)： 18
采樣率（每秒）： 1.33M
數(shù)據(jù)接口： DSP，MICROWIRE?，QSPI?，串行，SPI?
輸入范圍： ±VREF
在以下條件下的電源（標(biāo)準(zhǔn)）： 10.5mW @ 1.33MSPS
工作溫度： -40°C ~ 85°C
已用 IC / 零件： AD7984
已供物品： 板
AD7984
Rev. A | Page 20 of 24
CS MODE, 4-WIRE WITH BUSY INDICATOR
This mode is usually used when a single AD7984 is connected
to an SPI-compatible digital host with an interrupt input and
when it is desired to keep CNV, which is used to sample the
analog input, independent of the signal used to select the data
reading. This independence is particularly important in
applications where low jitter on CNV is desired.
The connection diagram is shown in Figure 34, and the
corresponding timing is given in Figure 35.
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 can be
used to select other SPI devices, such as analog multiplexers,
but SDI must be returned low before the minimum conversion
time elapses and then held low for the maximum possible
conversion time to guarantee the generation of the busy signal
indicator. When the conversion is complete, SDO goes from
high impedance to low impedance. With a pull-up on the SDO
line, this transition can be used as an interrupt signal to initiate
the data readback controlled by the digital host. The AD7984
then enters the acquisition phase and goes into standby mode.
The data bits are then clocked out, MSB first, by subsequent
SCK falling edges. The data is valid on both SCK edges. Although
the rising edge can be used to 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 optional 19th SCK
falling edge or SDI going high (whichever occurs first), SDO
returns to high impedance.
AD7984
SDI
SDO
CNV
SCK
CONVERT
DATA IN
CLK
DIGITAL HOST
IRQ
VIO
47k
CS1
0
697
3-
0
24
Figure 34. CS Mode, 4-Wire with Busy Indicator Connection Diagram
SDO
D17
D16
D1
D0
tDIS
SCK
1
2
3
171819
tSCK
tSCKL
tSCKH
tHSDO
tDSDO
tEN
CONVERSION
ACQUISITION
tCONV
tCYC
tACQ
ACQUISITION
SDI
CNV
tSSDICNV
tHSDICNV
06
97
3-
0
25
Figure 35. CS Mode, 4-Wire with Busy Indicator Serial Interface Timing
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