Anaren A8520E24A91 Bedienungsanleitung PDF herunterladen (Seite 6)

Page 6 of 36 A8520E24A91 – User’s Manual

Release Date 01/23/15

Anaren Integrated Radio (AIR)

1.1. Features

Features:

 Un-Compressed Wireless Audio

Connectivity

 Pre-defined protocol

 Configurable human interface

 Autonomous or Hosted mode

 2.2 to 3.6 V operation

 Programmable output power up to +19

dBm

 RoHS compliant

 Very small package size:

11mm x 19mm x 2.5mm

Benefits Summary:

 Operating temperature -40 to +85

 100% RF tested in production for

repeatable performance

 No RF engineering experience

necessary

 No protocol experience necessary

 Only requires a 2 layer Host PCB

implementation

 FCC & IC certified, ETSI compliant

 No regulatory “Intentional radiator”

testing required for integrating module

into end product. Simple certification

labeling replaces testing.

1.2. Theory of Operation

The A8520E24A91 interfaces directly to an audio Codec chip through the I

S for audio data and

C for volume control and other Codec chip settings.

A block diagram is given for the A8520E24A91 module in Figure 1.

 Antenna

o The antenna couples energy between the air and the module. The integral

antenna (f

= 2441.75 MHz) provides a near omni-directional antenna pattern

with high efficiency such that the application will work equally well in any

direction. Note that the end radiation pattern depends not only on the antenna,

but also the ground plane, enclosure and installation environment.

 Filtering

o Filtering removes spurious signals to comply with regulatory intentional radiator

requirements, provides reduced susceptibility to power supply and digital noise,

and filters out RF and high frequency noise from the digital audio and control link

S, I

C).

 Matching

o Matching provides the correct loading of the transmit amplifier to achieve the

highest output power as well as the correct loading for the receive LNA to

achieve the best sensitivity.

 Protocol

o The protocol implements an entire wireless audio transport mechanism with

adaptive frequency usage, retransmission of lost packets as well as a low data

rate link for remote control purposes.

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