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AN-2195 Datasheet(PDF) 5 Page - Texas Instruments

Part No. AN-2195
Description  AN-2195 Driving High Speed ADCs with the LMH6521 DVGA for High IF AC-Coupled Applications
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Maker  TI [Texas Instruments]
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AN-2195 Datasheet(HTML) 5 Page - Texas Instruments

   
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Optimal Performance
With a 2-tone large input signal with the LMH6521 set to maximum gain (26dB) to drive an input signal
level at the ADC of
−1 dBFS, the SNR and SFDR results are shown in Table 1 compared to the stand
alone ADC16DV160 specifications.
Table 1. SNR and SFDR Results
Configuration
ADC Input
SNR (dBFS)
SFDR (dBFS)
LMH6521 + BPF + ADC16DV160
−1 dBFS
75.5
82
ADC16DV160 only
−1 dBFS
76
89
6
Optimal Performance
Placement of the LMH6521 relative to the ADC16DV160 is essential for optimal performance. It is
recommended that the amplifier be placed as close the ADC as possible and with excellent layout and
decoupling techniques to achieve the desired system performance. One way to improve channel isolation
is to place the output inductors of each channel of the LMH6521 90 degrees to reduce magnetic coupling
as shown in Figure 7. As a minimum, a 4-layer board should be utilized with one ground, one power, and
two signal layers. However, by adding more layers, thicker top and bottom metal layers, and additional
through vias will improve heat dissipation of the LMH6521 and improve performance.
The LMH6521 DVGA is well suited to drive Texas Instruments family of high speed MSPS data
converters: ADC10DV200, ADC12EU050, ADC12C170, ADC16V130, and ADC16DV160. Contact a
Texas Instruments representative to obtain documentation on the SP16160CH2RB reference design files.
Figure 7. Output Inductors at 90 Degrees
5
SNOA569A – November 2011 – Revised April 2013
AN-2195 Driving High Speed ADCs With the LMH6521 DVGA for High IF
AC-Coupled Applications
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Copyright © 2011–2013, Texas Instruments Incorporated


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