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參數(shù)資料
| 型號： | XE1218AS000BF |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Low Power single die FM receiver |
| 中文描述： | 低功耗單芯片F(xiàn)M接收器 |
| 文件頁數(shù)： | 3/11頁 |
| 文件大?。?/td> | 192K |
| 代理商： | XE1218AS000BF |
3
D0204-157
Datasheet XE1218A: Low
Power single die FM receiver
1. Functional description
1.1
The XE1218A is an integrated FM receiver including all the necessary functions to process a modulated RF
signal at its input and deliver a “speech quality” audio signal at its output. The XE1218A was designed for
maximum system simplicity thus it requires only 12 external components to offer antenna in, audio out
functionality. The XE1218A also offers design flexibility. A direct connection to an earphone is possible through
the pin EAR, this takes advantage of the internal audio power amplifier or an external audio amplifier, or an
audio processing device can be connected via the OUT (line out) pin.
General description
1.2
The FM signal received through the antenna is delivered to an integrated LNA via an external matching circuit.
A low IF architecture is implemented to down-convert the incoming signal to an intermediate frequency (IF) of
25kHz. This IF signal is then filtered to remove any DC components and equalized to offer a clean digital signal
to the demodulator. The FM demodulator uses digital delay line architecture to convert the signal to a pulse
width modulated signal at twice the IF frequency. The XE1218A has an integrated AFC which is used for the
demodulator to have its clock frequency track the IF frequency.
RF front end
1.2.1
The noise figure (NF) for this block is less than 6dB, for an antenna impedance in the 1 to 2 k
range. Out of
the 6dB, 3dB is due to the noise of the image frequency that is not rejected. The sensitivity is –100dBm
(SINAD=10 dB, fdev = 3kHz).
LNA
1.2.2
The down-conversion is implemented as a Gilbert cell. This implementation uses low IF and does not have
provisions for integrated image rejection. The incoming audio channel will be demodulated at F
lo
= F
IN
– 25kHz.
This is to say that the image frequency will be located at F
IN
– 50kHz and will not be attenuated by the
XE1218A’s RF receiving circuitry. For multi-channel operation within reception range of several XE1218A
receivers, it is recommended that the various carrier frequencies be spaced by at least 100kHz, better yet
200kHz.
Mixer, down-conversion
1.2.3
DC components are attenuated in an off-set cancellation block. An on-chip low pass filter provides attenuation
greater than 65dBm measured F
IF
+ 100kHz
DC offset cancellation, IF amplifier chain
1.2.4
The demodulator converts the signal from the IF amplifier into a pulse width modulated signal at twice the IF
frequency. A follow-on block generates the AFC to track the IF frequency. Proper tracking of the IF frequency is
necessary for the stability of the RF link as the XE1218A operates in narrow band mode.
Demodulation and AFC circuitry
1.2.5
The local oscillator provides the XE1218A’s down-converter mixer with the proper frequency: F
lo
. It is
implemented with a crystal oscillator working on the external crystal’s overtone harmonic.
Crystal and local oscillator
1.3
Audio stage
1.3.1
The XE1218A integrated audio processing circuitry filters the input pulse width modulated (PWM) signal from
the demodulator and provides for two different output feeds. All necessary bias currents and voltages for this
analog block are on-chip, including a voltage multiplier circuit. When the incoming RF signal becomes low, the
signal to noise ratio at the audio output decreases, which drastically reduces the sound quality and intelligibility.
For user convenience, a mute function is implemented in the audio section. When the signal to noise ratio at the
output is too low (typ. 10 to 15 dB) the audio output is shut down.
Audio processing
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