參數(shù)資料
型號(hào): AD7980ARMZ
廠商: Analog Devices Inc
文件頁數(shù): 9/28頁
文件大?。?/td> 0K
描述: ADC 16BIT 1MSPS LP 10-MSOP
標(biāo)準(zhǔn)包裝: 1
系列: PulSAR®
位數(shù): 16
采樣率(每秒): 1M
數(shù)據(jù)接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 10mW
電壓電源: 單電源
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 10-TFSOP,10-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 10-MSOP
包裝: 管件
輸入數(shù)目和類型: 1 個(gè)偽差分,單極
Data Sheet
AD7980
Rev. C | Page 17 of 28
CS MODE, 3-WIRE, WITHOUT BUSY INDICATOR
This mode is usually used when a single AD7980 is connected
to an SPI-compatible digital host. The connection diagram is
shown in Figure 31, and the corresponding timing is given in
With SDI tied to VIO, a rising edge on CNV initiates a
conversion, selects the CS mode, and forces SDO to high
impedance. Once a conversion is initiated, it continues until
completion irrespective of the state of CNV. This can be useful,
for instance, to bring CNV low to select other SPI devices, such
as analog multiplexers; however, CNV 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 AD7980 enters the acquisition phase and powers down.
When CNV goes low, the MSB is output 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 that it has
an acceptable hold time. After the 16th SCK falling edge or
when CNV goes high, whichever is earlier, SDO returns to high
impedance.
06392-
015
AD7980 SDO
SDI
DATA IN
DIGITAL HOST
CONVERT
CLK
VIO
CNV
SCK
Figure 31. 3-Wire CS Mode Without Busy Indicator
Connection Diagram (SDI High)
06392-
016
SDI=1
tCNVH
tCONV
tCYC
CNV
AQUISITION
tACQ
tSCK
tSCKL
CONVERSION
SCK
SDO
D15
D14
D13
D1
D0
tEN
tHSDO
1
2
3
14
15
16
tDSDO
tDIS
tSCKH
Figure 32. 3-Wire CS Mode Without Busy Indicator Serial Interface Timing (SDI High)
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