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ADS5295IPFP Datasheet(PDF) 62 Page - Texas Instruments

Part # ADS5295IPFP
Description  12-Bit, 100-MSPS, 8-Channel Analog-to-Digital Converter
PDF  91 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

ADS5295IPFP Datasheet(HTML) 62 Page - Texas Instruments

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Sampling Frequency (MSPS)
SNR in External Reference
SNR in Internal Reference
G045
Device
Precision
Reference
REFT
REFB
R
S
1
F
m
V
T
V
B
+
-
+
-
R
S
1
F
m
ADS5295
SBAS595 – DECEMBER 2012
www.ti.com
Figure 56 shows an example of driving the reference pins. The 1-µF bypass capacitor helps provide the
switching current drawn by the REFT and REFB pins. The external amplifier must provide an average current of
5 mA or less at 100 MSPS. The performance in the external reference mode depends on the sampling speed. At
low sampling speeds (20 MSPS), the performance is the same as that of an internal reference. At higher speeds,
the performance degrades because of the effect of the parasitic bond-wire inductance of the REF pins. Figure 57
highlights the difference in SNR between the external and internal reference modes.
Figure 56. Driving Reference Inputs in External Reference Mode
Figure 57. SNR in Internal and External Reference Mode
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Copyright © 2012, Texas Instruments Incorporated
Product Folder Links: ADS5295



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