EWM-900-FDTC
Embedding the wireless future..
Low Cost 902-928MHz Full Duplex
Audio/Data Transceiver
Typical Applications
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Automated Meter Reading
Wireless Handsets
On-Site Paging
Asset Tracking
Wireless Alarm and Security Systems
Long Range RFID
Automated Resource Management
Features
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Low Cost
56 Channels
3V Operation
Small Size: 1.22” x 0.82”
No External Parts are required
Simple serial programming interface
RSSI
Description
The EWM-900-FDTC is ideal for unlicensed voice
and data applications. The transceiver module
requires no external RF components except for the
antenna. It is designed to make FCC and ETSI
approvals easy.
The transceiver operates in full duplex. It can
transmit and receive data and/or voice
simultaneously. The receiver section employs a
direct-conversion, zero IF architecture, eliminating
image frequency interference. The manufacturing-
friendly DIP style package and low-cost make the
EWM-900-FDTC suitable for high volume
applications.
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Document Control
Created By
Engineering Review
Marketing Review
Approved -
Engineering
Approved - Marketing
Steve Montgomery
10/30/02
Revision History
Revision
1.0
1.1
1.2
1.3
1.4
Author
SJM
SJM
GWH
TRM
GWH
Date
10/30/01
11/18/02
01/22/03
11/26/03
2/10/04
Description
Document Created
Module pin-out diagram and table corrected
Updated.
Fixed erroneous frequency table headers
Updated to reflect Rev D hardware.
- ii -
Table of Contents
Typical Applications ............................................................................................ i
Features................................................................................................................ i
Description ........................................................................................................... i
Document Control............................................................................................... ii
Revision History.................................................................................................. ii
Table of Figures ................................................................................................. iii
Pin Out Diagram.................................................................................................. 1
Pin Description.................................................................................................... 1
Mechanical Drawing ........................................................................................... 2
Absolute Maximum Ratings ............................................................................... 2
Detailed Electrical Specifications...................................................................... 2
Notes:................................................................................................................... 3
Circuit Description.............................................................................................. 5
Theory of Operation............................................................................................ 5
Configuration ...................................................................................................... 6
Reference Frequency Control Register .............................................................6
Applications Information.................................................................................. 11
Power Supply ..................................................................................................11
Ground ............................................................................................................11
Transmitter Start-Up Time ...............................................................................11
Transmitter Channel-Change Time .................................................................11
Transmitter Audio/Data Input Requirements ...................................................11
Receiver Start-Up Time...................................................................................12
Receiver Channel-Change Time .....................................................................12
Receiver Audio Output ....................................................................................12
Receiver Data Output......................................................................................12
RSSI................................................................................................................12
Ordering Information ........................................................................................ 12
- ii -
Table of Figures
Figure 1, Module Pin Diagram......................................................................................................... 1
Table 1, EWM-900-FDTC Module Pin Description.......................................................................... 1
Figure 2, Mechanical Drawing of EWM-900-FDTC ......................................................................... 2
Table 2, Absolute Maximum Ratings............................................................................................... 2
Table 3, Detailed Electrical Specifications ...................................................................................... 3
Figure 3, Block Diagram of Module ................................................................................................. 4
Figure 4, Serial Programming Waveforms. ..................................................................................... 6
Table 4, Reference Frequency Register ......................................................................................... 6
Table 5, Register Address Bits ........................................................................................................ 6
Table 6, Receive VCO Register ...................................................................................................... 7
Table 7, Transmit VCO Register ..................................................................................................... 7
Table 8, Mode Control Register....................................................................................................... 8
Table 9, Receive/Transmit Channel Programming Table ............................................................... 9
Figure 5, Evaluation Board Schematic Diagram ........................................................................... 10
Table 10, Ordering Information...................................................................................................... 12
- iii -
EWM-900-FDTC Full Duplex Voice/Data Transceiver
Data Sheet
Pin Out Diagram
Figure 1, Module Pin Diagram
Pin Description
Pin No.
Pin Name
Description
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
GND
ANT
GND
GND
GND
GND
AUDIO
NC
GND
CLK
DAT
LE
RSSI
RXD
TXD/AUDIN
VCC
Transceiver Ground. Connect to Ground Plane.
50 ohm Antenna Input.
Transceiver Ground. Connect to Ground Plane.
Transceiver Ground. Connect to Ground Plane.
Transceiver Ground. Connect to Ground Plane.
Transceiver Ground. Connect to Ground Plane.
Receive Audio Output.
No Connection.
Transceiver Ground. Connect to Ground Plane.
Serial programming interface clock.
Serial programming interface data.
Serial programming interface latch enable.
Receive Signal Strength Indicator.
Receive Data Output.
Transmit Data/Audio Input.
Power Supply. Vcc should be bypassed with a .01uF ceramic
capacitor and filtered with a 4.7uF tantalum capacitor. Noise on the
power supply will degrade receiver sensitivity.
Table 1, EWM-900-FDTC Module Pin Description
EWM-900-FDTC Data Sheet
Page 1
Revision 1.2 - 2/11/2004
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