AN4650 datasheet(25/102 Pages) STMICROELECTRONICS

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AN4650

Operating modes

102

2.7

Gyroscope bandwidth

The gyroscope sampling chain is represented by a cascade of four blocks: analog low-pass

anti-aliasing filter, ADC converter, digital low-pass filter and a selectable high-pass filter

(Figure 4).

Figure 4. Gyroscope sampling chain diagram

The analog signal coming from the mechanical parts is filtered by a low-pass anti-aliasing

filter (having a constant bandwidth) before being converted by the ADC. The digital signal is

then filtered by a low-pass digital filter whose cutoff frequency depends on the selected

gyroscope ODR: the cutoff values in Low-Power and Normal mode are shown in Table 13;

the cutoff values related to High-Performance mode are indicated in Table 14.

Table 13. Gyroscope digital low-pass filter cutoff in Low-Power / Normal mode

Gyroscope ODR [Hz]

Cutoff [Hz]

13 Hz (Low Power)

3.9

26 Hz (Low Power)

7.9

52 Hz (Low Power)

15.8

104 Hz (Normal mode)

31.4

208 Hz (Normal mode)

60.2

Table 14. Gyroscope digital low-pass filter cutoff in High-Performance mode

Gyroscope ODR [Hz]

Cutoff [Hz]

13 Hz (High Perf.)

4.2

26 Hz (High Perf.)

8.3

52 Hz (High Perf.)

16.6

104 Hz (High Perf.)

33.4

208 Hz (High Perf.)

66.7

416 Hz (High Perf.)

135.9

833 Hz (High Perf.)

295.4

1.66 kHz (High Perf.)

1057.0

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