參數(shù)資料
型號： AD7985BCPZ-RL7
廠商： Analog Devices Inc
文件頁數(shù)： 16/28頁
文件大?。?/td> 0K
描述： IC ADC 16B 2.5MSPS PULSR 20LFCSP
標準包裝： 1,500
系列： PulSAR®
位數(shù)： 16
采樣率（每秒）： 2.5M
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）： 33mW
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： 20-VFQFN 裸露焊盤，CSP
供應(yīng)商設(shè)備封裝： 20-LFCSP-VQ
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 1 個偽差分，單極
AD7985
Rev. A | Page 23 of 28
CHAIN MODE WITHOUT BUSY INDICATOR
This mode can be used to daisy-chain multiple AD7985 devices on
a 3-wire serial interface. It is available only in normal conversion
mode (TURBO is low). This feature is useful for reducing com-
ponent count and wiring connections, for example, in isolated
multiconverter applications or for systems with a limited inter-
facing capacity. Data readback is analogous to clocking a shift
register. A connection diagram example using two AD7985
devices is shown in Figure 34, and the corresponding timing is
When SDI and CNV are low, SDO is driven low. With SCK low,
a rising edge on CNV initiates a conversion, selects chain mode,
and disables the busy indicator. In this mode, CNV is held high
during the conversion phase and the subsequent data readback.
When the conversion is complete, the MSB is output onto SDO,
and the AD7985 enters the acquisition phase and powers down.
The remaining data bits stored in the internal shift register are
clocked by subsequent SCK falling edges. For each ADC, SDI
feeds the input of the internal shift register and is clocked by the
SCK falling edge. Each ADC in the chain outputs its data MSB
first, and 16 × N clocks are required to read back the N ADCs.
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 and consequently more
AD7985 devices in the chain, provided that the digital host has
an acceptable hold time. The maximum conversion rate may be
reduced due to the total readback time.
CONVERT
DATA IN
CLK
DIGITAL HOST
AD7985
SDI
SDO
CNV
B
SCK
AD7985
SDI
SDO
CNV
A
SCK
TURBO
07947-
017
Figure 34. Chain Mode Without Busy Indicator Connection Diagram
TURBO = 0
SDOA = SDIB
DA15
DA14
DA13
SCK
1
2
3
30
31
32
tSSDISCK
tHSDISCK
tEN
CONVERSION
ACQUISITION
tCONV
tCYC
tACQ
ACQUISITION
CNV
DA1
14
15
tSCK
tSCKL
tSCKH
DA0
17
18
16
SDIA = 0
SDOB
DB15
DB14
DB13
DA1
DB1
DB0
DA15
DA14
tHSDO
tDSDO
tQUIET
tHSCKCNV
DA0
07947-
018
Figure 35. Chain Mode Without Busy Indicator Serial Interface Timing
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD7986 制造商:AD 制造商全稱:Analog Devices 功能描述:1 nV/√Hz, Low Power
AD7986BCPZ 功能描述:IC ADC 18BIT 2MSPS SAR 20LFCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標準包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 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:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個單端，單極；2 個差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6
AD7986BCPZ-RL7 功能描述:IC ADC 18BIT 2MSPS SAR 20LFCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個單端，雙極
AD7986BCPZ-U1 制造商:Analog Devices 功能描述:16-BIT, 10MSPS PULSAR DIFFERENTIAL ADC - Rail/Tube
AD7986XCPZ-U1 制造商:Analog Devices 功能描述:16-BIT, 10MSPS PULSAR DIFFERENTIAL ADC - Rail/Tube
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