XtremeMac IA-AIR-00 User Manual

FCC ID: STQAIR00

Model: IA-AIR-00

Description: FM Transmitter

Date: 30.Nov.2004

Introduction

IA-AIR-00 is a stereo audio signal transmitter over FM band. It works as a slave device of

controlled by the digital command from
bands. The two bands are hardware programmable by factory jumper setting of open and short. One is 88.1 to 107.9

MHz for U.S. The other one is 76.0 to 96.0 MHz for Japan. Both are in the step of 200 kHz.

iPOD through UART interface. It operates in either one of the two frequency

iPOD

and

Features

a. A LCD displays 4 digits in 7-segment format with one decimal place. Digits show the transmission

frequency in the unit of MHz.

b. Two buttons to adjust the transmission frequency.

c. A DC power rates 3.3 Volts and 60mA whose is from the external device (No battery cell is needed or

built-in).

d. Stereo analog audio input is from external device.

e. The operation mode of IA-AIR-00 is controlled by external device.

FCC ID: STQAIR00

Description

The ID appearance of IA-AIR-00 is shown in Figure 1 and 2. The functional block diagram of IA-AIR-00 is

depicted in Figure 3. And the schematic is shown in Figure 4. The first stage is the transmitter plug-in
tuned with the selected frequency.

ID appearance

The front of IA-AIR-00 has the said LCD and two control buttons. The LCD shows the transmission frequency

in MHz with one decimal place and the display will switch off automatically for power saving purpose after no further key

operation in 3sec. One of the control button symbolic “
downward in 200kHz step. Another control button marked “

At the bottom side of IA-AIR-00, there are two connectors. The audio plug is the audio signal input connector.

And the dedicated 4 pins connector is the UART signal interface connection medium.

On the top of IA-AIR-00, a customer logo is silk-screen printed.

A brief product description is printed on the rear side of IA-AIR-00.

Block diagram

In the block diagram, there are totally six functional blocks, (1) Power management; (2) RF transmission; (3)

Micro-controller unit; (4) Input device and interface; (5) Output device; (6) Memory.

Schematic

The key components of power management have REG710NA-5TI and MMBT3906.

BH1415F is the key chips of RF transmission.

EM78P806A is the essential part of IA-AIR-00 as the centralized control block. The dedicated firmware is

resident inside the ROM part of the micro-controller.

The control buttons are the input device. The interface is the audio signal input and the UART interface.

The output device is LCD panel and the display backlight.

HT2201 works as the memory of IA-AIR-00. It stores the transmission frequency and provides the last

transmission frequency.

—“ has the function of tuning the transmission frequency

＋

” tunes the frequency upward in 200kHz.

iPOD and is