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AS5304 Datasheet(PDF) 8 Page - ams AG

Part No. AS5304
Description  Integrated Hall ICs for Linear and Off-Axis Rotary Motion Detection
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Maker  AMSCO [ams AG]
Homepage  http://www.ams.com
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AS5304 Datasheet(HTML) 8 Page - ams AG

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AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection
Revision 1.5
www.austriamicrosystems.com
Page 8 of 13
7.4
Dynamic Non-Linearity (DNL)
The DNL (dynamic non-linearity) describes the non-linearity of the incremental outputs from one step to the next. In an ideal
system, every change of the incremental outputs would occur after exactly one LSB (e.g. 25µm on AS5304). In practice
however, this step size is not ideal, the output state will change after 1LSB +/-DNL. The DNL must be <+/- ½ LSB to avoid a
missing code. Consequently, the incremental outputs will change when the magnet movement over the IC is
minimum 0.5 LSB and maximum 1.5 LSB’s.
1 LSB + DNL
1 LSB - DNL
1 LSB
lateral magnet movement
37.5 µm
25 µm
12.5 µm
AS5304:
DNL (dynamic non-linearity)
1 LSB + DNL
1 LSB - DNL
1 LSB
lateral magnet movement
22.5 µm
15 µm
7.5 µm
AS5306:
DNL (dynamic non-linearity)
Figure 11:
DNL of AS5304 (left) and AS5306 (right)
8 The AO Output
The Analog Output (AO) provides an analog output voltage that represents the Automatic Gain Control (AGC) of the Hall
sensors signal control loop.
This voltage can be used to monitor the magnetic field strength and hence the gap between magnet and chip surface:
Short distance between magnet and IC → strong magnetic field → low loop gain → low AO voltage
Long distance between magnet and IC → weak magnetic field → high loop gain → high AO voltage
For ideal operation, the AO voltage should be between 1.0 and 4.0V (typical; see 9.5).
Figure 12:
AO output versus AGC, magnetic field strength, magnet-to-IC gap


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