ADIS16130

Rev. 0 | Page 10 of 16

CONFIGURATION OPTIONS

Synchronization Input

The SYNC pin can be used to synchronize the ADIS16130 with

other devices in the system. When the SYNC bit in the I/O port

register (IOP) is set and the SYNC pin is low, the ADIS16130

does not process any conversions. Instead, it waits until the

SYNC pin goes high, and then starts the operation. This allows

the conversion to start from a known point in time (for example,

the rising edge of the SYNC pin).

Self-Test Function

The self-test function enables system-level diagnostic checks for the

entire ADIS16130 sensor/signal conditioning circuit. To activate

the self-test function, there must be a logic high signal on all

ST pins (see Table 5). When activated, the self-test function results

in a rate measurement shift. By comparing the observed shift

with the limits specified in this data sheet, users can determine

the pass/fail criteria for system-level diagnostic routines.

For normal gyroscope operation, place a logic low input on

all ST pins. For systems that do not require this feature, tie all

ST pins to GND.

Analog Bandwidth

The typical −3 dB cutoff frequency for the ADIS16130 is

300 Hz, which is the combined response of two single-pole

filters, as shown in Figure 14. Pin ROA1 and Pin ROA2 provide

the opportunity for further bandwidth reduction in the first

filter stage, as shown in the following relationship:

()

ext

dB

C

C

R

f

+

×

×

π

×

=

−

2

1

3

where:

R = 25 kΩ.

C = 6800 pF.

The relationship between the −3 dB cutoff frequency and the

external capacitance of the ADIS16130 is shown in Table 7 and

Figure 15.

327Hz

1kHz

ADC

Figure 14. Frequency Response Block Diagram

1

10

100

1k

10k

FREQUENCY (Hz)

0

–1

–2

–3

–4

–5

–6

–7

–8

–9

–10

Table 7. Nominal Bandwidth for Standard Capacitor Values

BW (Hz)

BW (Hz)

BW (Hz)

1000

276.8

10,000

198.9

100,000

52.2

1200

274.4

12,000

187.2

120,000

44.8

1500

270.9

15,000

172.1

150,000

37.0

1800

267.5

18,000

159.2

180,000

31.5

2200

263.1

22,000

144.7

220,000

26.3

2700

257.7

27,000

129.9

270,000

21.8

3300

251.6

33,000

115.7

330,000

18.1

3900

245.8

39,000

104.4

390,000

15.5

4300

242.1

43,000

97.9

430,000

14.1

4700

238.4

47,000

92.3

470,000

12.9

5100

234.9

51,000

87.2

510,000

12.0

5600

230.7

56,000

81.6

560,000

10.9

6200

225.8

62,000

75.8

620,000

9.9

7500

215.8

75,000

65.6

750,000

8.2

8200

210.8

82,000

61.2

820,000

7.6

9100

204.7

91,000

56.3

910,000

6.8