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ADS5545 Datasheet(PDF) 32 Page - Texas Instruments

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Part No. ADS5545
Description  11-BIT, 200 MSPS ADC
Download  54 Pages
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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ADS5545 Datasheet(HTML) 32 Page - Texas Instruments

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Example Drive Circuits
WBC1-1TLB
1:1
1:1
0.1 F
m
INP
INM
VCM
25 W
100 W
25 W
3.3pF
0.1 F
m
15
(Note A)
W
15
(Note A)
W
WBC1-1TLB
100 W
33 W
33 W
Z andTFADC
i
-6
-5
-1
1
f − Frequency − MHz
0
1000
2
-4
100
200
500
700
-2
-3
0
400
300
600
800
900
0
50
250
350
f − Frequency − MHz
0
1000
500
100
100
200
500
700
200
150
300
400
300
600
800
900
400
450
ADS5517
SLWS203 – DECEMBER 2007
Using 10-
Ω series resistance and 25 Ω-3.3 pF-25 Ω as the R-C-R filter, high effective bandwidth (700 MHz) can
be achieved, (see Figure 35, transfer function from the analog input pins to the voltage across the sampling
capacitors).
In addition to the above ADC requirements, the drive circuit may have to be designed to provide a low insertion
loss over the desired frequency range and matched impedance to the source. For this, the ADC input impedance
has to be taken into account (Figure 36).
A suitable configuration using RF transformers and including the R-C-R filter is shown in Figure 34. Note the
15-
Ω series resistors and the low common-mode impedance (using 33-Ω resistors terminated to VCM).
A.
Use lower series resistance (
≈ 5 Ω to 10 Ω) at high input frequencies (> 100 MHz)
Figure 34. Example Drive Circuit With RF Transformers
Figure 35. Analog Input Bandwidth, TFADC (Actual
Figure 36. Input Impedance, ZI
Silicon Data)
32
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Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): ADS5517


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