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ADS58C48IPFPR Datasheet(PDF) 48 Page - Texas Instruments |
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ADS58C48IPFPR Datasheet(HTML) 48 Page - Texas Instruments |
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48 / 70 page  INx_P INx_M VCM 10to15 0.1uF 10to15 Rin Cin ADS58C48 T1 50 50 3.3pF 25 25 1:1 1:1 0.1uF T2 5to10 0.1uF 5to10 T1 25 25 1:1 1:1 0.1uF T2 INx_P INx_M VCM Rin Cin ADS58C48 BANDPASS ORLOWPASS FILTER 10 0.1uF 10 100 100 1:4 INx_P INx_M VCM Rin Cin ADS58C48 Differential InputSignal ADS58C48 SLAS689 – MAY 2010 www.ti.com 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. An additional termination resistor pair may be required between the two transformers as shown in the figures. The center point of this termination is connected to ground to improve the balance between the P and M sides. The values of the terminations between the transformers and on the secondary side have to be chosen to get an effective 50 Ω (in the case of 50-Ω source impedance). Figure 54. Drive Circuit with Low Bandwidth (For low input frequencies) Figure 55. Drive Circuit with High Bandwidth (For high input frequencies) All these examples show 1:1 transformers being used with a 50- Ω source. As explained in the Drive Circuit Requirements, this helps to present a low source impedance to absorb the sampling glitches. With a 1:4 transformer, the source impedance will be 200 Ω. The higher impedance can lead to degradation in performance, compared to the case with 1:1 transformers. For applications where only a band of frequencies are used, the drive circuit can be tuned to present a low impedance for the sampling glitches. Figure 56 shows an example with 1:4 transformer, tuned for a band around 150 MHz. Figure 56. Drive Circuit with 1:4 Transformer 48 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s) :ADS58C48 |
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