參數(shù)資料
型號(hào)： AD7687BCPZRL7
廠(chǎng)商： Analog Devices Inc
文件頁(yè)數(shù)： 13/28頁(yè)
文件大小： 0K
描述： IC ADC 16BIT SAR 250KSPS 10LFCSP
標(biāo)準(zhǔn)包裝： 1
系列： PulSAR®
位數(shù)： 16
采樣率（每秒）： 250k
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）： 12.5mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 10-WFDFN 裸露焊盤(pán)，CSP
供應(yīng)商設(shè)備封裝： 10-LFCSP-WD（3x3）
包裝： 標(biāo)準(zhǔn)包裝
輸入數(shù)目和類(lèi)型： 1 個(gè)差分，雙極
產(chǎn)品目錄頁(yè)面： 778 (CN2011-ZH PDF)
配用： EVAL-AD7687CBZ-ND - BOARD EVALUATION FOR AD7687
其它名稱(chēng)： AD7687BCPZRL7DKR
AD7687
Data Sheet
Rev. B | Page 20 of 28
CS MODE 4-WIRE, NO BUSY INDICATOR
This mode is usually used when multiple AD7687s are
connected to an SPI-compatible digital host.
A connection diagram example using two AD7687s is shown in
Figure 39 and the corresponding timing is given in Figure 40.
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 AD7687 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 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 AD7687 can be read.
DATA IN
CLK
CS1
CONVERT
CS2
DIGITAL HOST
02972-
038
CNV
SCK
SDO
SDI
AD7687
CNV
SCK
SDO
SDI
AD7687
Figure 39. CS Mode 4-Wire, No BUSY Indicator Connection Diagram
SDO
D15
D14
D13
D1
D0
tDIS
SCK
12
3
30
31
32
tHSDO
tDSDO
tEN
CONVERSION
ACQUISITION
tCONV
tCYC
tACQ
ACQUISITION
SDI(CS1)
CNV
tSSDICNV
tHSDICNV
D1
14
15
tSCK
tSCKL
tSCKH
D0
D15
D14
17
18
16
SDI(CS2)
02972-
039
Figure 40. CS Mode 4-Wire, No BUSY Indicator Serial Interface Timing
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