ADC31RF80IRMP datasheet(29/136 Pages) TI1

29 / 136 page

Input Frequency (MHz)

100

200

300

500 700 1000

2000 3000

5000

-8

-7

-6

-5

-4

-3

-2

-1

D062

100 Ohm Source

50 Ohm Source

Input Frequency (MHz)

500

1000

1500

2000

2500

3000

-3

-2

-1

D063

Input Frequency (MHz)

500

1000

1500

2000

2500

3000

0.01

0.02

0.03

0.04

0.05

0.06

0.07

D001

D064

ADC31RF80

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SBAS860 – AUGUST 2017

Product Folder Links: ADC31RF80

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Feature Description (continued)

The input impedance of analog inputs can also be modelled as parallel combination of equivalent resistance and

capacitance. Figure 82 and Figure 83 show how equivalent impedance (CIN and RIN) vary over frequency.

Figure 82. Differential Input Capacitance vs

Input Frequency

Figure 83. Differential Input Resistance vs Input Frquency

Each input pin (INP, INM) must swing symmetrically between (CM + 0.3375 V) and (CM – 0.3375 V), resulting in

a 1.35-VPP (default) differential input swing. Figure 84 shows that the input sampling circuit has a 3-dB bandwidth

that extends up to approximately 3.2 GHz.

Figure 84. Input Bandwidth with a 100-Ω Source Resistance

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