AS5030 8-bit Programmable Magnetic Rotary Encoder

Rev. 1.8

www.austriamicrosystems.com

Page 13 of 33

4.19 Analog Output

This configuration is similar to the PWM connection (only three

lines including supply are required). With the addition of a lowpass

filter at the PWM output, this configuration produces an analog

voltage that is proportional to the angle.

This filter can be either passive (as shown) or active. The lower

the bandwidth of the filter, the less ripple of the analog output can

be achieved.

If the AS5030 angular data is invalid, the PWM output will remain

at low state and thus the analog output will be 0V. Pins that are

not shown may be left open.

Note that the PWM output is invalid when the AGC is disabled

(see 5.2.2).

Figure 14: Data transmission with pulse width modulated (PWM) output

Figure 15: Relation of PWM/Analog output with angle

4.20 Analog Sin/Cos outputs with external interpolator

By connecting C1 to VDD, the AS5030 provides analog

Sine and Cosine outputs (Sin, Cos) of the Hall array

front-end for test purposes. These outputs allow the user

to perform the angle calculation by an external ADC +

µC, e.g. to compute the angle with a high resolution.

In addition, the inverted Sine and Cosine signals (Sinn,

Cosn; see dotted lines) are available for differential

signal transmission.

The input resistance of the receiving amplifier or ADC

should be greater than 100kΩ. The signal lines should be

kept as short as possible, longer lines should be shielded

in order to achieve best noise performance.

Figure 16: Sine and Cosine outputs for external angle calculation

The SIN / COS / SINn / COSn signals are amplitude controlled to ~1.3Vp (differential) by the internal AGC controller. The DC

bias voltage is 2.25 V.

If the SIN(n)- and COS(n)- outputs cannot be sampled simultaneously, it is recommended to disable the automatic gain control

(see 5.2.2) as the signal amplitudes may be changing between two readings of the external ADC. This may lead to less accurate

results.

AS5030

100n

CS

PWM

+5V

VDD

VSS

C2

VDD

13

11

16

15

C1

VSS

3

14

>=4k7

>=4k7

>=1µF

>=1µF

Analog

out

AS5030

micro

controller

100n

Sin

Cos

+5V

VDD

VSS

VSS

VSS

VDD

VDD

D A

D A

Sinn

Cosn

C1

C2

14

13

3

15

5

4

7

6