Rosen 9100452 Скачать руководство пользователя страница 3

Страница: 3 / 11

Rosen Entertainment Systems LLC

8/30/2005

Rosen FMT. Part # 9100458

General Description

Rosen’s FMT module, part# 9100458 is a 12-channel FM transmitter

designed to transmit audio signals over the FM frequency band to
enable users to listen to audio from an independent video system over

the existing car audio system via the radio.

Architectural Overview

The FMT transmitter is designed around the BH1417 from Rohm. Refer

to the datasheet for details on this part. The module runs off a 5VDC
supply, left and right audio signals should be at 1V RMS to achieve

maximum volume.

A 74HC161 counter is used to control the channel selection of the FM

transmitter. The interface to the counter is accomplished by way of a
3-wire communication bus consisting of CLOCK, CLEAR and GROUND

lines. A 5V pulse on the CLOCK line will step to the next channel. A 5V
pulse on the CLEAR line will reset back to the default channel.

FM transmission can be switched on and off by applying and removing

the 5VDC supply to the module itself.

Notice : The changes or modifications not expressly approved by the party

responsible for compliance could void the user’s authority to operate the

equipment.

THIS DEVICE COMPLIES WITH PART 15 OF THE FCCRULES. OPERATIONS IS

SUBJECT TO THE FOLLOWING TWO CONDITIONS: ( 1 ) THIS DEVICE MAY

NOT CAUSE HARMFUL INTERFERENCE AND ( 2 ) THIS DEVICE MUST

ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFEERENCE

THAT MAY CAUSE UNDESRIED OPERATION

Содержание 9100452

Страница 1: ...Rosen Entertainment Systems LLC 8 30 2005 Rosen FMT Part 9100458 Rosen Entertainment Systems Wireless FM Transmitter Part 9100458 User Guide...

Страница 2: ...2 General Description 3 Architectural Overview 3 Block Diagram 4 Operating Guide 5 Interface board wiring diagram 5 Interface Pinout Definition 6 Design considerations 6 Appendix 1 Frequency Table 7...

Страница 3: ...l selection of the FM transmitter The interface to the counter is accomplished by way of a 3 wire communication bus consisting of CLOCK CLEAR and GROUND lines A 5V pulse on the CLOCK line will step to...

Страница 4: ...2005 Rosen FMT Part 9100458 Block Diagram The block diagram below shows the main components of the FMT module and how they are interconnected Stereo TDM Pre Scalar Pre Scalar Divide Ratio BH1417F AMP...

Страница 5: ...ve and black should connect to Gnd Connect a stereo audio source with a maximum 1V RMS signal to Audio_R and Audio_L connectors Tune your radio receiver to 88 1Mhz Audio should be heard To step to th...

Страница 6: ...ence 7 SEL2_A Counter clock sets the output of the counter 8 SEL1_A Counter Clear resets the counter to 0 9 ANT Not Used for test purpose only Design considerations The module is intended to interface...

Страница 7: ...shows the value of the 74HC161 counter as well as the corresponding FM transmission frequency 2 88 1 MHz 3 88 3 MHz 4 88 5 MHz 5 88 7 MHz 6 88 9 MHz 7 no setting 7 is a meaningless value 8 106 7 MHz...

Страница 8: ...status of the FMT Example Code I O Name Function SEL1_A Clear SEL2_B Clock FMTLOAD Load reset INITIALIZATION PROCESS Initialization I O SEL1_A 1 SEL2_A 1 FMTLOAD 1 Reset Counters SEL1_A 0 delay 2 mic...

Страница 9: ...ems LLC 8 30 2005 Rosen FMT Part 9100458 do the following for each increment of the station example the following 3 lines should be done 3 times to set 88 3 SEL2_A 0 delay 2 microseconds SEL2_A 1 stor...

Страница 10: ...1 2 R22 10K 1 2 R6 4 7K 1 2 SEL1_A R23 10K 1 2 C12 1uF 10V 1 2 5V 5VA ANT 5V R20 10K 1 2 C23 0022uF 1 2 C36 0 01uF 1 2 Q3 2SD2142K 1 2 3 C27 27pF 1 2 C21 1000pF 1 2 C31 1000pF 1 2 LA D5 KV 1471E 1 2 D...

Страница 11: ...LC 8 30 2005 Rosen FMT Part 9100458 Appendix 4 Specifications Operation power supply voltage 4 8 5 2 V DC Transmission Frequency 88 1 88 9Mhz 106 7 107 9 Mhz Step 200Khz Operating Temperature 0 60 C D...