ADS62P45 Datasheet, PDF (42/67 Pages) Texas Instruments – Dual Channel 14-Bit, 125/105/80/65 MSPS ADC with Parallel CMOS/DDR LVDS outputs

ADS62P45, ADS62P44
ADS62P43, ADS62P42
REV1P0 SEP 2007
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Figure 12 Drive circuit at low input frequencies
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 13 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 13 Drive circuit at high input frequencies
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the formative or design phase of development.
Characteristic data and other specifications are design
goals. Texas Instruments reserves the right to change or
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discontinue these products without notice.
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