參數(shù)資料
型號(hào): EVAL-AD7983SDZ
廠商: Analog Devices Inc
文件頁(yè)數(shù): 11/24頁(yè)
文件大小: 0K
描述: BOARD EVAL FOR AD7983
標(biāo)準(zhǔn)包裝: 1
系列: PulSAR®
ADC 的數(shù)量: 1
位數(shù): 16
采樣率(每秒): 1.33M
數(shù)據(jù)接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
輸入范圍: 0 ~ 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: AD7983
已供物品:
AD7983
Rev. A | Page 19 of 24
CS MODE, 4-WIRE WITHOUT BUSY INDICATOR
This mode is usually used when multiple AD7983s are
connected to an SPI-compatible digital host.
A connection diagram example using two AD7983s is shown in
Figure 30, and the corresponding timing is given in Figure 31.
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 high before the minimum conversion
time elapses and then held high for the maximum conversion
time to avoid the generation of the busy signal indicator.
When the conversion is complete, the AD7983 enters the
acquisition phase and goes into standby mode. Each ADC result
can be read by bringing its SDI 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 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
16th SCK falling edge or when SDI goes high, whichever is
earlier, SDO returns to high impedance and another AD7983
can be read.
DIGITAL HOST
CONVERT
CS2
CS1
CLK
DATA IN
AD7983 SDO
SDI
CNV
SCK
AD7983 SDO
SDI
CNV
SCK
06
97
4-
01
6
Figure 30. CS Mode, 4-Wire Without Busy Indicator Connection Diagram
tCONV
tCYC
ACQUISITION
tACQ
tSCK
tSCKH
tSCKL
CONVERSION
SCK
CNV
tSSDICNV
tHSDICNV
SDO
D15
D13
D14
D1
D0
D15
D14
D1
D0
tHSDO
tEN
1
2
3
14
15
16
17
18
30
31
32
tDSDO
tDIS
SDI(CS1)
SDI(CS2)
06
97
4-
0
17
Figure 31. CS Mode, 4-Wire Without Busy Indicator Serial Interface Timing
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