AS5306AATSU austriamicrosystems, AS5306AATSU Datasheet - Page 8

• Manufacturer Part Number: AS5306AATSU
• Description: IC, LINEAR ENCODER, 12.3BIT, 20-TSSOP
• Manufacturer: austriamicrosystems
• Type: Linear Magneticr

Specifications of AS5306AATSU

• Ic Function: Encoder IC
• Supply Voltage Range: 4.5V To 5.5V
• Operating Temperature Range: -40°C To +125°C
• Digital Ic Case Style: TSSOP
• No. Of Pins: 20
• Termination Type: SMD
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Package / Case: 20-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection
7.4
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.
8
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:
For ideal operation, the AO voltage should be between 1.0 and 4.0V (typical; see 9.5).
Revision 1.5
•
•
The AO Output
Dynamic Non-Linearity (DNL)
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
AS5304:
DNL (dynamic non-linearity)
1 LSB + DNL
37.5 µm
lateral magnet movement
1 LSB
25 µm
Figure 12:
1 LSB - DNL
Figure 11:
AO output versus AGC, magnetic field strength, magnet-to-IC gap
12.5 µm
www.austriamicrosystems.com
DNL of AS5304 (left) and AS5306 (right)
AS5306:
DNL (dynamic non-linearity)
1 LSB + DNL
22.5 µm
lateral magnet movement
1 LSB
15 µm
1 LSB - DNL
7.5 µm
Page 8 of 13