AD5560JBCZ datasheet(49/68 Pages) AD

49 / 68 page

Data Sheet

AD5560

Rev. D | Page 49 of 68

The AD5560 has three compensation modes. The power-on default mode is SAFEMODE enabled. This ensures that the device is stable

into any load. Use Compensation Register 1 to configure the device for autocompensation, where the user inputs the CDUT and ESR

bits, and the AD5560 chooses the most appropriate compensation scheme for these load conditions.

Table 20. Compensation Register 1

Address

Default

Data Bits, MSB First

0x4

0x0000

Bit

Name

Function

CDUT[3:0]

Use these control bits to tell the device how much capacitive load there is so that the device can

optimize the compensation used. Do not overestimate CDUT because this can cause oscillations.

Underestimating CDUT gives suboptimal but stable performance.

CDUT

CDUT Min

CDUT Max

0 nF

50 nF

83 nF

138 nF

229 nF

380 nF

630 nF

1.1 µF

1.7 µF

2.9 µF

4.8 µF

7.9 µF

13 µF

22 µF

36 µF

60 µF

160 µF

ESR[3:0]

Use these control bits to tell the device how much ESR there is in series with CDUT so that the device can

optimize the compensation used. Do not underestimate ESR because this can cause oscillations.

Overestimating ESR gives suboptimal but stable performance.

ESR

ESR Min

ESR Max

0 mΩ

1 mΩ

1.8 mΩ

3.4 mΩ

6.3 mΩ

12 mΩ

21 mΩ

40 mΩ

74 mΩ

140 mΩ

250 mΩ

460 mΩ

860 mΩ

1500 mΩ

2900 mΩ

5400 mΩ

6400 mΩ

10,000 mΩ

SAFEMODE

SAFEMODE = 0 overrides values in Compensation Register 1 to make the force amplifier stable under

most load conditions. This mode is useful if it is unknown what the DPS is driving, but it does result in an

extremely slow response. The default operation on power-on or reset is SAFEMODE.

SAFEMODE settings are always gm[1:0] = 2, RP[2:0] = 0, RZ[2:0] = 0, CC[3:1] = 111, CF[2:0] = 5, and CC0 = 1.

Set this bit high to enable autocompensation.

6:0

Reserved

Set to 0.

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