AD5560JBCZ datasheet(50/68 Pages) AD

50 / 68 page

AD5560

Data Sheet

Rev. D | Page 50 of 68

Table 21. Compensation Register 2

Address

Default

Data Bits, MSB First

0x5

0x0110

Bit

Name

Function

Manual

compensation

The AD5560 can be manually configured to compensate the force amplifier into a wide range of load

conditions. When this bit is high, manual compensation mode is active, and it overrides the settings of

Compensation Register 1. Readback when in manual compensation mode returns the compensation

settings loaded to the force amplifier and loaded to this register. Similarly, when in autocompensation

mode, readback of this register address returns the compensation settings of the force amplifier. However,

readback of this register address when in safe mode does not reflect SAFEMODE settings. SAFEMODE

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

RZ[2:0]

Set the value of RZ to add a zero at the following frequencies. This calculation assumes that CC0 = 100 pF.

RZx(Ω)

FZ (Hz)

500

3.2 M

1.6 k

1 M

5 k

320 k

16 k

100 k

50 k

32 k

160 k

10 k

500 k

3.2 k

1.6 M

1 k

RP[2:0]

Set the value of RP to add an additional pole. There is an internal 8 pF capacitor to provide an RC filter,

creating a pole at one of the following frequencies.

RP[2:0]

RP (Ω)

FP (Hz)

200

100 M

675

29 M

2280

8.7 M

7700

2.6 M

26 k

760 k

88 k

220 k

296 k

67 k

1 M

20 k

gm[1:0]

Set the transconductance of the force amplifiers input stage. The gain bandwidth (GBW) of the force

voltage loop is equal to gmx/CC0. The following values assume CC0 = 100 pF.

gmx

gmx (µA/V)

GBW (Hz)

64 k

130 k

300

480 k (default)

900

1.3 M

CF[2:0]

These bits determine which feedforward capacitor CFx is switched in.

CFx

Action

None

CF0

CF1

CF2

CF3

CF4

None

CC3

Connect CC3 in series with 100 kΩ1

CC2

Connect CC2 in series with 25 kΩ1

CC1

Connect CC1 in series with 6 kΩ1

Reserved

1 This item corresponds to a SAFEMODE setting (SAFEMODE is the power-on default setting).

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