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參數(shù)資料
| 型號(hào)： | AD7942BCPRL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 14-Bit, 250 kSPS PulSAR ADC in MSOP/QFN |
| 中文描述： | 1-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, DSO10 |
| 封裝： | 3 X 3 MM, QFN-10 |
| 文件頁數(shù)： | 9/28頁 |
| 文件大?。?/td> | 633K |
| 代理商： | AD7942BCPRL7 |
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Preliminary Technical Data
AD7942
Rev Pr B | Page 17 of 28
Power Supply
The AD7942 is specified over a wide operating range from 2.3 V
to 5.5 V. It has, unlike other low voltage converters, a noise low
enough to design a low supply (2.5V) 14-bit resolution system
with respectable performance. It uses two power supply pins: a
core supply VDD and a digital input/output interface supply
VIO. VIO allows direct interface with any logic between 1.8 V
and VDD. To reduce the supplies needed, the VIO and VDD can
be tied together. The AD7942 is independent of power supply
sequencing between VIO and VDD. Additionally, it is very
insensitive to power supply variations over a wide frequency
range, as shown in Figure 26, which represents PSRR over
frequency.
Figure 26. PSRR vs. Frequency
The AD7942 powers down automatically at the end of each
conversion phase and, therefore, the power scales linearly with
the sampling rate as shown in see Figure 27. This makes the part
ideal for low sampling rate (even a few Hz) and low battery-
powered applications.
Figure 27. Operating Currents vs. Sampling Rate
Supplying the ADC from the Reference
For simplified applications, the AD7942, with its low operating
current, can be supplied directly using the reference circuit, as
shown in Figure 28. The reference line can be driven by either:
The system power supply directly
A reference voltage with enough current output
capability, such as the ADR43x
A reference buffer, such as the AD8031, that can also
filter the system power supply, as shown in Figure 28.
AD8031
AD7942
VIO
REF
VDD
10
F
1
F
10
10k
5V
1
F
(NOTE 1)
NOTE 1: OPTIONAL REFERENCE BUFFER AND FILTER
Figure 28. Example of Application Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AD7942BCPWP | 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit, 250 kSPS PulSAR ADC in MSOP/QFN |
| AD7942BCPZRL | 功能描述:IC ADC 14BIT SAR 250KSPS 10LFCSP 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):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個(gè)單端，單極 |
| AD7942BCPZRL1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit, 250 kSPS PulSAR, Pseudo Differential ADC in MSOP/QFN |
| AD7942BCPZRL7 | 功能描述:IC ADC 14BIT 250KSPS 10-LFCSP 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® 其它有關(guān)文件:TSA1204 View All Specifications 標(biāo)準(zhǔn)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(gè)單端，單極；2 個(gè)差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD7942BCPZRL71 | 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit, 250 kSPS PulSAR, Pseudo Differential ADC in MSOP/QFN |
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