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LMH6517EVAL-R1

更新时间： 2024-11-24 11:37:15
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美国国家半导体 - NSC /
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10页 3713K
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Evaluation Board is designed to aid in the characterization of National

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National Semiconductor  
Application Note 2081  
Loren Siebert  
LMH6517EVAL-R1  
Evaluation Board  
October 5, 2010  
30130311  
FIGURE 1. LMH6517EVAL-R1 Evaluation Board  
to the board should preserve the operating points of the DV-  
GA and protect sensitive test equipment.  
General Description  
The LMH6517EVAL-R1 evaluation board is designed to aid  
in the characterization of National Semiconductor’s High  
Speed LMH6517 Digital Controlled Variable Gain Amplifier  
(DVGA).  
Transformers T1– T4 can provide both impedance matching  
as well as single ended to differential conversion. The board  
is shipped with 2:1 turns ratio transformers that will match  
50Ω equipment with the 200Ω input impedance of the  
LMH6517 DVGA . Do not connect the transformer secondary  
winding directly to ground since this will short the DVGA input  
voltage to ground.  
Use the evaluation board as a guide for high frequency layout  
and as a tool to aid in device testing and characterization.  
Basic Operation  
For differential operation the board must be modified by hand.  
The copper on the grounded input must be cut as illustrated  
in Figure 7. and additional SMA connectors need to be sol-  
dered to the board to complete the IN- and OUT- signal paths.  
The LMH6517EVAL-R1 Evaluation board is 0.63” thick and  
uses edge mounted SMA connectors. The board is built with  
Emerson part #142–0701–806 end launch, nickel plated SMA  
connectors.  
The LMH6517 DVGA has differential input and differential  
output. To aid evaluation with 50Ω, single ended test equip-  
ment the LMH6517EVAL-R1 evaluation board is shipped with  
transformers on both the input and output signal paths. The  
single ended signal path uses the IN+ and OUT+ marked  
connectors. The IN− and OUT− signal paths are grounded  
and the SMA connectors are not installed.  
The LMH6517EVAL-R1 evaluation board comes built with 1:1  
balun transformers and 10 Ohm series output resistors (R42,  
R43, R44 and R45). A 4.7pF load capacitor is placed between  
the resistors and the transformer (C14 and C15). The 10 Ohm  
resisters and 4.7pF capacitor form a snubber circuit that re-  
duces high frequency peaking and enhances stability. The  
The input and output pins of the LMH6517 will self bias to  
approximately mid supply (2.5V). The LMH6517EVAL-R1  
board has been designed with AC coupling on both input and  
output signal paths to protect test equipment and to ensure  
proper operation of the LMH6517 DVGA. Any modifications  
National Semiconductor® is a registered trademark of National Semiconductor Corporation.  
Windows® is a registered trademark of Microsoft Corporation.  
© 2010 National Semiconductor Corporation  
301303  
www.national.com  
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