參數(shù)資料
型號(hào)： AD7942BRMRL7
廠商： ANALOG DEVICES INC
元件分類(lèi)： 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, PDSO10
封裝： MO-187BA, MSOP-10
文件頁(yè)數(shù)： 9/28頁(yè)
文件大?。?/td> 633K
代理商： AD7942BRMRL7
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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參數(shù)描述
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