參數(shù)資料
型號(hào): AD7944BCPZ
廠商: Analog Devices Inc
文件頁數(shù): 14/28頁
文件大?。?/td> 0K
描述: IC ADC 14BIT 2.5MSPS 20LFCSP
標(biāo)準(zhǔn)包裝: 1
系列: PulSAR®
位數(shù): 14
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: 托盤
輸入數(shù)目和類型: 1 個(gè)偽差分,單極
產(chǎn)品目錄頁面: 780 (CN2011-ZH PDF)
AD7944
Rev. A | Page 21 of 28
CS MODE, 4-WIRE WITHOUT BUSY INDICATOR
This mode is usually used when multiple AD7944 devices are
connected to an SPI-compatible digital host. A connection dia-
gram example using two AD7944 devices 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 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 multi-
plexers, but SDI must be returned high before the minimum
conversion time elapses and then held high for the maximum
possible conversion time to avoid the generation of the busy
signal indicator.
When the conversion is complete, the AD7944 enters the
acquisition phase and, if the part is in normal mode (TURBO
low), powers down. 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 that it
has an acceptable hold time. After the 14th SCK falling edge, SDO
returns to high impedance and another AD7944 can be read.
AD7944
SDI
SDO
CNV
SCK
CONVERT
DATA IN
CLK
DIGITAL HOST
CS1
CS2
AD7944
SDO
CNV
SCK
04658-
013
Figure 30. CS Mode, 4-Wire Without Busy Indicator Connection Diagram
ACQUISITION (n)
ACQUISITION
(n – 1)
ACQUISITION
(n + 1)
1
2
BEGIN DATA (n – 1)
CONVERSION (n)
END DATA (n – 1)
SCK
CNV
SDO
12
13
CONVERSION (n – 1)
END DATA (n – 2)
tCONV
tDATA
0
(I/O QUIET
TIME)
(I/O QUIET
TIME)
14
12
13
14
1
13
12
11
2
0
1
2
SDI
(I/O QUIET
TIME)
tCYC
tACQ
tQUIET
tSCK
tDIS
tHSDO
tHSDICNV
tSSDICNV
tEN
tDSDO
tHSDO
tDATA
tCONV
04658-
014
Figure 31. CS Mode, 4-Wire Without Busy Indicator Serial Interface Timing
相關(guān)PDF資料
PDF描述
AD7946BCPZRL7 IC ADC 14BIT 500KSPS 10-LFCSP
AD7948BN IC DAC 12BIT MULT PARALL 20-DIP
AD7949BCPZRL7 IC ADC 14BIT 250KSPS 8CH 20LFCSP
AD7951BSTZRL IC ADC 14BIT 1MSPS 48-LQFP
AD7952BCPZ IC ADC 14BIT DIFF 1MSPS 48LFCSP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD7944BCPZ-RL7 功能描述:IC ADC 14B 2.5MSPS PULSR 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:PulSAR® 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):12 采樣率(每秒):300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散(最大):75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC(0.295",7.50mm 寬) 供應(yīng)商設(shè)備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個(gè)單端,單極;1 個(gè)單端,雙極
AD7945 制造商:AD 制造商全稱:Analog Devices 功能描述:+3.3 V/+5 V Multiplying 12-Bit DACs
AD7945AN-B 功能描述:IC DAC 12BIT MULT PARALL 20-DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:2,400 系列:- 設(shè)置時(shí)間:- 位數(shù):18 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:3 電壓電源:模擬和數(shù)字 功率耗散(最大):- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:36-TFBGA 供應(yīng)商設(shè)備封裝:36-TFBGA 包裝:帶卷 (TR) 輸出數(shù)目和類型:* 采樣率(每秒):*
AD7945ANZ-B 功能描述:IC DAC 12BIT MULT PARALL 20DIP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:47 系列:- 設(shè)置時(shí)間:2µs 位數(shù):14 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:單電源 功率耗散(最大):55µW 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP(0.209",5.30mm 寬) 供應(yīng)商設(shè)備封裝:28-SSOP 包裝:管件 輸出數(shù)目和類型:1 電流,單極;1 電流,雙極 采樣率(每秒):*
AD7945ARS-B 功能描述:IC DAC 12BIT MULT PARALL 20-SSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:47 系列:- 設(shè)置時(shí)間:2µs 位數(shù):14 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:單電源 功率耗散(最大):55µW 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP(0.209",5.30mm 寬) 供應(yīng)商設(shè)備封裝:28-SSOP 包裝:管件 輸出數(shù)目和類型:1 電流,單極;1 電流,雙極 采樣率(每秒):*