[Photo] BA1404 / 1404F FM stereo transmitter circuit

â—† Function introduction
BA1404 / 1404F is an FM stereo transmitter integrated circuit produced by Japan Toyo Electric Manufacturing Co., Ltd. (Rohm Co. Ltd.). This circuit integrates functions such as stereo modulation, FM modulation, and RF amplifier on a single chip. Only a few external components are needed to obtain a good stereo FM signal.
â—† Features
Adopt low voltage, low power consumption design, the voltage is between 1V and 3V, the typical value is 1.25V, the maximum power consumption is 500mW, the quiescent current is 3mA.
Stereo modulation, FM modulation, RF amplification and other functions are integrated on a country's chip, requiring fewer peripheral components.
The separation between the two channels is high, with a typical value of 45dB.
The input impedance is 540Ω (fin = 1kHz), and the input gain is 377dB (Vin = 0.5mV).
The typical RF output voltage is 600mV.
â—† Packaging form
BA1404: DIP18, BA1404F: SIP18
â—† Pin function
Pin name Features
1 R-CH INPUT Right channel audio input
2 AF BIAS Audio amplifier bias
3 AF GND Audio amplifier
4 OSC BIAS 38kHz oscillator bias
5, 6 XTAL Crystal oscillator
7 RF OUT RF amplifier output
8 RF GND RF amplifier ground
9, 10 OSC Radio Frequency Oscillation Network
11 VREF Reference voltage
12 MOD IN Modulation signal input
13 PILOT OUT Pilot signal output
14 MPX OUT Two-channel composite signal output
15 VCC power supply
16, 17 MPX BALANCE Channel balance
18 L-CH INPUT Right channel audio input

â—† Structure diagram
BA1404 block diagram (5,475 bytes)

 â—† Limit parameters
parameter symbol Limit value unit
voltage VCC 3.6 V
Power dissipation Pd 500 (Note) mW
range of working temperature Topr -25 to 75 ℃
Store document scope Tstg -50 to 125 ℃
Note: When the working temperature is higher than 25 ℃, decrease it by 5mW / ℃.

â—† Recommended working conditions
parameter symbol Minimum value Typical value Maximum unit
voltage VCC 1 1.25 3 V

â—† Electrical parameters
parameter symbol unit Test Conditions Minimum value Typical value Maximum
Quiescent Current IQ mA 0.5 3 5
Input resistance ZIN Ω f = 1kHz 360 540 720
Input gain GV dB VIN = 0.5mV 30 37
Channel balance CB dB VIN = 0.5mV 2
Mixer maximum output voltage VOM mVp-p THD≤3% 200
38kHz leakage voltage of the mixer VOO mV Static 1
Pilot output voltage VOP mVp-p No load 460 580
Channel separation Sep dB Standard demodulator 25 45
Equivalent input noise voltage VNIN μVrms IHF-A stops at 38kHz 1
High output maximum output voltage VOSC mV 350 600

â—† Typical circuit
BA1404 typical circuit (9,345 bytes)

 â—† Reference materials
"Foreign electronic components" 2000 4 on page 10, "Principles and Applications of BA1404 FM stereo transmitter chip", author: Zhejiang University of Technology, Zhu Yonghui "newsletter bound volume" 1995 album Nianxia 164 " BA1404 to do with wireless microphones ", author: Huizhou Zhusi Zhong" newsletter bound volume "1996 Nianxia album page 12," electric guitar wireless transmitter receiver ", author: Gansu Zhou Jun" Beijing Newsletter bound volume "1994 on page 188, "small, low-power personal communication machine", the author: Shandong Yangying Bo
In-depth analysis of the first-level cache and second-level cache of the technical zone CPU eMMC mass burning dilemma, do you really know? Isolation flyback and non-isolated BUCK application design plan Schottky barrier diode selection and application guide How to use Altium in program design Designer puzzle?

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