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REF2925 bảng dữ liệu(PDF) 45 Page - Texas Instruments

tên linh kiện REF2925
Giải thích chi tiết về linh kiện  ADS8881x 18-Bit, 1-MSPS, Serial Interface, microPower, Miniature, True-Differential Input, SAR Analog-to-Digital Converter
PDF  62 Pages
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nhà sản xuất  TI2 [Texas Instruments]
Trang chủ  https://www.ti.com
Logo TI2 - Texas Instruments

REF2925 bảng dữ liệu(HTML) 45 Page - Texas Instruments

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tCONV
tACQ
tACQ
tCONV
tTHROUGHPUT
2 x tTHROUGHPUT
~50000X
IAVDD
Device Phase
~1200X
IREF
~2X
IAVG(AVDD+REF)
~50000X
~1200X
AVDD
AINP
AINN
GND
DIN
SCLK
DOUT
CONVST
REF
DVDD
1 µF
1 µF
Digital
Supply
Analog
Supply
45
ADS8881
www.ti.com
SBAS547D – MAY 2013 – REVISED AUGUST 2015
Product Folder Links: ADS8881
Submit Documentation Feedback
Copyright © 2013–2015, Texas Instruments Incorporated
12 Power-Supply Recommendations
The device has two separate power supplies: AVDD and DVDD. The internal circuits of the device operate on
AVDD; DVDD is used for the digital interface. AVDD and DVDD can be independently set to any value within the
permissible range.
12.1 Power-Supply Decoupling
Decouple the AVDD and DVDD pins with GND, using individual 1-µF decoupling capacitors placed in close
proximity to the pin, as shown in Figure 74.
Figure 74. Supply Decoupling
12.2 Power Saving
The device has an auto power-down feature that powers down the internal circuitry at the end of every
conversion. Referring to Figure 75, the input signal is acquired on the sampling capacitors when the device is in
a power-down state (tacq); at the same time, the result for the previous conversion is available for reading. The
device powers up on the start of the next conversion. During conversion phase (tconv), the device also consumes
current from the reference source (connected to the REF pin).
Figure 75. Power Scaling With Throughput



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