ADS1271IPWR datasheet(23/40 Pages) TI2

23 / 40 page

ADS1271

SBAS306F − NOVEMBER 2004 − REVISED OCTOBER 2007

www.ti.com

−1

−2

−3

−4

−5

−6

−7

−8

−9

−10

Normalized Input Frequency (f

IN/fDATA)

0.45

0.47

0.49

0.51

0.53

0.55

Figure 56. Transition Band Response for

High-Speed and Low-Power Modes

−20

−40

−60

−80

−100

−120

−140

−160

Input Frequency (f

IN/fDATA)

016

4864

Figure 57. Frequency Response Out to fMOD for

High-Speed and Low-Power Modes

High-Resolution Mode

The oversampling ratio is 128 in High-Resolution mode.

Figure 58

shows

the

frequency

response

High-Resolution mode normalized to fDATA. Figure 59

shows the passband ripple, and the transition from

passband to stop band is illustrated in Figure 60. The

overall frequency response repeats at multiples of the

modulator frequency fMOD, (128 × fDATA), as shown in

Figure 61. The stop band of the ADS1271 provides 100dB

attenuation of frequencies that begin just beyond the

passband and continue out to fMOD. Placing an

antialiasing, low-pass filter in front of the ADS1271 inputs

recommended

limit

possible

high-amplitude

out-of-band signals and noise.

−20

−40

−60

−80

−100

−120

−140

0.50

Normalized Input Frequency (f

IN/fDATA)

00.25

0.75

Figure 58. Frequency Response for

High-Resolution Mode

0.02

−0.02

−0.04

−0.06

−0.08

−0.10

0.2

Normalized Input Frequency (f

IN/fDATA)

0.1

0.3

0.4

0.5

0.6

Figure 59. Passband Response for

High-Resolution Mode

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