ADC3441 Datasheet, PDF (70/83 Pages) Texas Instruments – Analog-to-Digital Converter

ADC3441, ADC3442, ADC3443, ADC3444
SBAS670A – JULY 2014 – REVISED OCTOBER 2015
10 Applications and Implementation
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NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
10.1 Application Information
Typical applications involving transformer-coupled circuits are discussed in this section. Transformers (such as
ADT1-1WT or WBC1-1) can be used up to 250 MHz to achieve good phase and amplitude balances at ADC
inputs. While designing the dc driving circuits, the ADC input impedance must be considered. Figure 185 and
Figure 186 show the impedance (Z_in = R_in || C_in) across the ADC input pins.
10
6
5
1
4
3
0.1
2
0.01
0
100 200 300 400 500 600 700 800 900 1000
Frequency (MHz)
D024
Figure 185. Differential Input Resistance, R_IN
1
0 100 200 300 400 500 600 700 800 900 1000
Frequency (MHz)
D02051
Figure 186. Differential Input Capacitance, C_IN
70
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