Datasheet

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INP
INM
VCM
1:1
5 W
25 W
25 W
5 W
0.1 Fm
0.1 Fm
TF_ADC
S0256-01
ADS6xxx
INP
INM
VCM
1:1 1:1
5 W
50 W
50 W
50 W
50 W
5 W
0.1 Fm
0.1 Fm
S0164-04
ADS6xxx
ADS6245 , ADS6244
ADS6243 , ADS6242
SLAS542A – MAY 2007 – REVISED JULY 2007
Figure 85. Single Transformer Drive Circuit
At high input frequencies, the mismatch in the transformer parasitic capacitance (between the windings) results
in degraded even-order harmonic performance. Connecting two identical RF transformers back-to-back helps
minimize this mismatch, and good performance is obtained for high frequency input signals. Figure 86 shows an
example using two transformers (Coilcraft WBC1-1). An additional termination resistor pair (enclosed within the
shaded box in Figure 86 ) may be required between the two transformers to improve the balance between the P
and M sides. The center point of this termination must be connected to ground.
Figure 86. Two Transformer Drive Circuit
44 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): ADS6245 ADS6244 ADS6243 ADS6242