DB1065 Datasheet, PDF (2/23 Pages) CML Microcircuits – CTCSS Encoder / Decoder Development Kit

Table of Contents
1. General Information __________________________________________________ 3
1.1 Introduction _____________________________________________________________ 3
1.2 Warranty _______________________________________________________________ 3
1.3 DB1065 Features_________________________________________________________ 4
1.4 Handling Precautions _____________________________________________________ 4
1.4.1 Static Protection _____________________________________________________________ 4
1.4.2 Cleanliness _________________________________________________________________ 4
1.5 Unpacking ______________________________________________________________ 4
2. Electrical Performance ________________________________________________ 4
2.1 Absolute Maximum Ratings ________________________________________________ 4
2.2 Operating Characteristics __________________________________________________ 5
2.3 Prerequisites and Required Equipment ________________________________________ 6
2.3.1 Prerequisites ________________________________________________________________ 6
2.3.2 Power Supply _______________________________________________________________ 6
2.4 Limitations _____________________________________________________________ 6
3. Quick Start __________________________________________________________ 6
3.1 Introduction _____________________________________________________________ 6
3.2 First... _________________________________________________________________ 6
3.3 Second - Setup___________________________________________________________ 6
3.4 Third - Select and Execute a Test ____________________________________________ 7
3.4.1 CTCSS encoder verification ____________________________________________________ 7
3.4.2 Transmit audio path verification_________________________________________________ 8
3.4.3 CTCSS decoder verification ____________________________________________________ 8
3.4.4 Receive audio path verification _________________________________________________ 8
4. Fourth - Explore______________________________________________________ 9
4.1 Measuring CTCSS Encoder response time _____________________________________ 9
4.2 Measuring CTCSS Decoder response time_____________________________________ 9
4.3 Measuring CTCSS Decoder band width _______________________________________ 9
4.4 Measuring CTCSS response at different SINADs _______________________________ 9
4.5 Performance at other operating voltages______________________________________ 10
4.6 Connecting the DB1065 to a system _________________________________________ 12
4.7 TIA / EIA 603 __________________________________________________________ 13
5. Hardware __________________________________________________________ 14
5.1 Introduction ____________________________________________________________ 14
5.2 Description ____________________________________________________________ 14
5.2.1 Functional Layout of Circuitry _________________________________________________ 14
5.2.2 Connectors ________________________________________________________________ 14
6. Logic Table for operation______________________________________________ 16
6.1 I/O Conditions __________________________________________________________ 16
6.2 CTCSS Programming ____________________________________________________ 16
7. Troubleshooting _____________________________________________________ 17
7.1 Suggestions ____________________________________________________________ 17
7.2 If you still need help _____________________________________________________ 18
8. Retrofitting from older designs _________________________________________ 18
8.1 Comparison Specifications ________________________________________________ 18
8.2 External Components Comparison __________________________________________ 19
20480150.001 MX-COM
1996
Page 2