Datasheet

www.ti.com
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
ADS6424
ADS6423
ADS6422
SLAS532A – MAY 2007 – REVISED JUNE 2007
APPLICATION INFORMATION (continued)
Figure 67. 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 68 shows an
example using two transformers (Coilcraft WBC1-1). An additional termination resistor pair (enclosed within the
shaded box) 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 68. Two Transformer Drive Circuit
42 Copyright © 2007, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Link(s): ADS6424 ADS6423 ADS6422