參數(shù)資料
型號: AD7688BCPZRL7
廠商: Analog Devices Inc
文件頁數(shù): 9/28頁
文件大小: 0K
描述: IC ADC 16BIT SAR 500KSPS 10LFCSP
標準包裝: 1
系列: PulSAR®
位數(shù): 16
采樣率(每秒): 500k
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): 21.5mW
電壓電源: 模擬和數(shù)字
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 10-WFDFN 裸露焊盤,CSP
供應商設(shè)備封裝: 10-LFCSP-WD(3x3)
包裝: 標準包裝
輸入數(shù)目和類型: 2 個單端,單極;2 個單端,雙極;1 個差分,單極;1 個差分,雙極
其它名稱: AD7688BCPZRL7DKR
AD7688
Rev. A | Page 17 of 28
CS MODE 3-WIRE, NO BUSY INDICATOR
This mode is usually used when a single AD7688 is connected
to an SPI-compatible digital host. The connection diagram is
shown in Figure 34 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 to
completion irrespective of the state of CNV. For instance, it
could be useful to bring CNV low to select other SPI devices,
such as analog multiplexers, but CNV 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 AD7688
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 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.
CNV
SCK
SDO
SDI
DATA IN
CLK
CONVERT
VIO
DIGITAL HOST
AD7688
02973-
033
Figure 34. CS Mode 3-Wire, No BUSY Indicator
Connection Diagram (SDI High)
SDO
D15
D14
D13
D1
D0
tDIS
SCK
1
2
3
14
15
16
tSCK
tSCKL
tSCKH
tHSDO
tDSDO
CNV
CONVERSION
ACQUISITION
tCONV
tCYC
ACQUISITION
SDI = 1
tCNVH
tACQ
tEN
02973-
034
Figure 35. CS Mode 3-Wire, No BUSY Indicator Serial Interface Timing (SDI High)
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