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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)： | 4/11頁 |
| 文件大小： | 192K |
| 代理商： | XE1218AS000BF |
4
D0204-157
Datasheet XE1218A: Low
Power single die FM receiver
1.3.2
An integrated power amplifier (PA) allows for a direct connection to an earphone. Controlled by an external
potentiometer (100k
) a maximum attenuation of 10dB is achievable on the EAR output, 21.5dB with 1M
. A
high impedance line out (10k
) is available through the pad OUT.
Audio output stage
2. Functional implementation
2.1 Block diagram
2.2 Operation overview
While the XE1218A is a single channel receiver, various fixed frequencies can be selected between 130MHz
and 230MHz. This is achieved by changing the external RF front-end components: L1, L2, L3, L4, C1, C2, C4,
C5 and Xtal. The XE1218A FM receiver connects to the antenna via a differential input: pins RFI and RFG. The
external components L4, C4 and C5 must tune the circuit to the incoming carrier frequency. L2 and C2 are
calculated to tune the oscillator to the desired incoming carrier frequency. Xtal is selected according to the
desired input carrier frequency, L3 relaxes the oscillator’s Q factor to insure greater reception stability.
Reception sensitivity is determined through the LNA’s external tank circuit: C1 and L1.
Two types of audio outputs can be selected: OUT (line out, 10k
output impedance) to connect to an external
audio processing circuit or amplifier and EAR for direct connection to an earphone. An external R1 is used to
adjust the volume through pin VOL. The internal RF and audio blocks each have their own supply voltage as
well as a common VDD. Clean voltage must be supplied to each of these supplies (VCCR, VCCA, VCCO and
VDD).
Xtal
XE1218
LNA
FM
DEMOD
Audio
SW
AFC
OSC
PA
VCC
Line OUT
VDD
VCCR VCCA
VCC
VM VSS
L2
C2
C1 L1
C5
R1
Volume
Control
C3
RFI
RFG
RFT
LOP LON XP XN
EAR
VOL
OUT
VCCO
VCC
L3
A1
L4
AUD
C4
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