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ADS5474IPFP Scheda tecnica(PDF) 22 Page - Texas Instruments

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Il numero della parte ADS5474IPFP
Spiegazioni elettronici  14-Bit, 400-MSPS Analog-to-Digital Converter
PDF  41 Pages
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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ADS5474IPFP Scheda tecnica(HTML) 22 Page - Texas Instruments

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ExternalVREFApplied
V
-
75
70
65
60
55
50
45
40
2.05 2.15 2.25 2.35 2.45
3.15
f =400MSPS
f
=70MHz
S
IN
2.55 2.65 2.75 2.85 2.95 3.05
A
= 4dBFS
-
IN
A
= 3dBFS
-
IN
A
= 2dBFS
-
IN
A
= 1dBFS
-
IN
A
= 5dBFS
-
IN
A
= 6dBFS
-
IN
ExternalVREFApplied
V
-
1.0
0.5
0
-0.5
-1.0
-1.5
-3.0
2.2
2.3
2.4
2.5
3.1
2.6
2.7
2.8
f =400MSPS
f
=70MHz
A
=< 1dBFS
S
IN
IN
-
2.9
3.0
BestFit:
y= 3.14x+7.5063
-
-2.0
-2.5
ExternalVREFApplied
V
-
90
80
70
60
50
40
2.05 2.15 2.25 2.35 2.45
3.15
f =400MSPS
f
=70MHz
S
IN
2.55 2.65 2.75 2.85 2.95 3.05
A
= 6dBFS
-
IN
A
= 4dBFS
-
IN
A
= 3dBFS
-
IN
A
= 5dBFS
-
IN
A
= 2dBFS
-
IN
A
= 1dBFS
-
IN
ADS5474
SLAS525C – JULY 2007 – REVISED JANUARY 2016
www.ti.com
Device Functional Modes (continued)
Figure 38. Signal Gain Adjustment vs External Reference
Figure 39. SFDR vs External VREF and AIN
(VREF)
Figure 40. SNR vs External VREF and AIN
For dc-coupled applications that use the VCM pin of the ADS5474 device as the common mode of the signal in
the analog signal gain path prior to the ADC inputs, the information in Figure 42 is useful to consider versus the
allowable common-mode range of the device that is receiving the VCM voltage, such as an operational amplifier.
Because it is pin-compatible, it is important to note that the ADS5463 does not have a VCM pin and primarily
uses the VREF pin to provide the common-mode voltage in dc-coupled applications. The ADS5463 (VCM = 2.4
V) and ADS5474 (VCM = 3.1V) devices do not have the same common-mode voltage. To create a board layout
that may accommodate both devices in dc-coupled applications, route VCM and VREF both to a common point
that can be selected via a switch, jumper, or a 0-
Ω resistor.
22
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Copyright © 2007–2016, Texas Instruments Incorporated
Product Folder Links: ADS5474



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