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AD2S1210

Rev. A | Page 20 of 36

CONFIGURATION OF AD2S1210

MODES OF OPERATION

The AD2S1210 has two modes of operation: configuration mode

and normal mode. The configuration mode is used to program

the registers that set the excitation frequency, the resolution,

and the fault detection thresholds of the AD2S1210. Configuration

mode is also used to read back the information in the fault register.

The data in the position and velocity registers can also be read

back while in configuration mode. The AD2S1210 can be operated

entirely in configuration mode or, when the initial configuration is

completed, the part can be taken out of configuration mode and

operated in normal mode. When operating in normal mode, the

data outputs can provide angular position or angular velocity

data. The A0 and A1 inputs are used to determine whether the

AD2S1210 is in configuration mode and to determine whether

the position or velocity data is supplied to the output pins, see

Table 8.

Setting the Excitation Frequency

The excitation frequency of the AD2S1210 is set by writing a

frequency control word to the excitation frequency register,

Address 0x91 (see the Register Map section).

(

)

CLKIN

FCW

Frequency

Excitation

where FCW is the frequency control word and fCLKIN is the clock

frequency of the AD2S1210.

The specified range of the excitation frequency is from 2 kHz to

20 kHz and can be set in increments of 250 Hz. To achieve the

angular accuracy specifications in Table 1, the excitation frequency

should be selected as outlined in Table 7.

Table 7. Recommended Excitation Frequency vs. Resolution

(fCLKIN = 8.192 MHz)

Resolution

Typical

Bandwidth

Min Excitation

Frequency

Max Excitation

Frequency

10 Bits

4100 Hz

10 kHz

20 kHz

12 Bits

1700 Hz

6 kHz

20 kHz

14 Bits

900 Hz

3 kHz

12 kHz

16 Bits

250 Hz

2 kHz

10 kHz

Note that the recommended frequency range for each resolution

and bandwidth, as outlined in Table 7, are defined for a clock

frequency of 8.192 MHz. The recommended excitation frequency

range scales with the clock frequency of the AD2S1210. The

default excitation frequency of the AD2S1210 is 10 kHz when

operated with a clock frequency of 8.192 MHz.

A0, A1 Inputs

The AD2S1210 allows the user to read the angular position or

the angular velocity data directly from the parallel outputs or

through the serial interface. The required information can be

selected using the A0 and A1 inputs. These inputs should also

be used to put the part into configuration mode. The data from

the fault register and the remaining on-chip registers can be

accessed in configuration mode.

Table 8. Configuration Mode Settings

Result

Normal mode—position output

Normal mode—velocity output

Reserved

Configuration mode

RES0, RES1 Inputs

In normal mode, the resolution of the digital output is selected

using the RES0 and RES1 input pins. In configuration mode,

the resolution is selected by setting the RES0 and RES1 bits in

the control register. When switching between normal mode and

configuration mode, it is the responsibility of the user to ensure

that the resolution set in the control register matches the resolution

set by the RES0 and RES1 input pins. Failure to do so may result

in incorrect data on the outputs, caused by the differences

between the resolution settings.

Table 9. Resolution Settings

RES0

RES1

Resolution

(Bits)

Position LSB

(Arc min)

Velocity LSB

(rps)1

21.1

4.88

5.3

0.488

1.3

0.06

0.3

0.004

1 CLKIN = 8.192 MHz. The velocity LSB size and maximum tracking rate scale

linearly with the CLKIN frequency.

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