EM2 Transmissive Optical Encoder0 pages

EM2

Transmissive Optical Encoder Module
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Description
The EM2 is a transmissive optical encoder module designed to offer 2x or 4x
higher resolution than the EM1 encoder module. This module is designed to
detect rotary position when used with a US Digital code wheel. The EM2 consists
of a lensed LED source and a monolithic detector IC enclosed in a small polymer
package that is identical to the EM1. The EM2 uses phased array detector
technology to provide superior performance and greater tolerances over
traditional aperture mask type encoders.
The EM2 provides digital A & B quadrature outputs with a third output index
channel. Each EM2 module is resolution specific and is matched to the
resolution of a code wheel. The EM2 operates with a single 5V supply and
provides single ended outputs which are capable of both sinking and sourcing
5mA. An internal 0.1 uF decoupling capacitor is designed into the EM2 to provide
enhanced noise immunity.
For open collector and higher voltage applications, add the PC3 cable driver, or
for differential cable driver outputs, add the PC4 cable driver. Encoder disks,
quadrature decoder chips, counter chips, computer interface boards, mating
connectors and cables are also available.
Download the EM2/EM1 comparison chart.

Features
Two channel quadrature with index
High resolution version of EM1
Single 5V supply
Rotary versions up to 10000 CPR
Linear versions up to 2000 CPI
Internal decoupling capacitor
Outputs source/sink 5 mA

Rev. 150813130929