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Application Note

Broadcom

AS-22-Kit-Encoder-AN101

December 15, 2017

Introduction

The Broadcom

®

 AS22 Series kit encoder solution offers a 

compact size with an overall diameter of 22 mm and height 
of 10.9 mm for the space-constrained application. 

To meet the growing demand for high-precision application, 
the AS22 Series offers a wide range of incremental 
resolution, ranging from 360 to 2048 counts per revolution 
(cpr). 

The encoder provides A and B channel of incremental digital 
signal output, as well as a digital index pulse per revolution 
enabling the homing positioning operation. The 
three-channel solution comes with the optional RS 422 
compatible differential output offering the high transmission 
noise immunity for signal over cable.

To cater to a wide selection of industrial applications, this 
encoder is design to operate in a robust environment with 
the operating temperature ranging from –20°C to +100°C.

The AS22 Series is designed for ease of use. The kit 
solution is engineered with the hassle-free installation, 
eliminating the need for a tedious alignment process. 

This application note provides step-by-step mounting 
instructions on how to install the AS22 series encoder onto 
a motor.

Encoder Mounting and Assembly 
Instruction

Step 1: Base Plate Centering

Place the base plate over the motor shaft, and make sure it 
sits flat on the mounting surface. Slide the alignment sleeve 
to the motor shaft with the taper surface facing the base 
plate. Ensure the alignment sleeve is aligned to the hole on 
the base plate. Align the two holes on the base plate to the 
screw holes on mounting surface. Slightly pressing the 
alignment sleeve, and tighten the 2x M2.5 screw with 
0.10 Nm to 0.23 Nm (0.9 in.lb to 2.0 in.lb) to secure the 
base plate. It is recommended that you apply adhesive to 
the screw-baseplate interface to prevent screw loosening 
due to effects of high temperatures on plastic.

Figure 1:  Base Plate Assembly

Base plate

Alignment sleeve

AS22 Series

Miniature Kit Encoder

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