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參數(shù)資料
| 型號： | XE1218A |
| 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)： | 9/11頁 |
| 文件大小： | 192K |
| 代理商： | XE1218A |
9
D0204-157
Datasheet XE1218A: Low
Power single die FM receiver
5. Input – output signal description
Pin Name
LOP
Description
Local oscillator tank
Functionality
The integrated local oscillator is used to produce the
mixer frequency to down convert the incoming carrier
frequency. This local oscillator requires an external tank
circuit, which must be tuned to select the desired crystal
overtone.
The crystal is connected between pins XP and XN. An
inductance must be put in parallel.
Type
Analog I/O
LON
Local oscillator tank
Analog I/O
XP
Crystal oscillator
connection
Crystal oscillator
connection
RF signal input
(differential to RFG)
RF signal ground
(differential to RFI)
LNA tank circuit
Analog I/O
XN
Analog I/O
RFI
Analog Input
RFG
The incoming carrier frequency is fed to the LNA via a
differential input (RFI and RFG). For best results, an
external capacitive impedance matching circuit is
required.
The LNA has an external tank circuit to optimize its gain.
The resonance frequency of this tank circuit must be
adjusted to be the same as the incoming carrier
frequency
This is the supply voltage for the RF section of the
XE1218A. It must be clean and de-coupled properly.
Analog ground
RFT
Analog I/O
VCCR
Supply voltage to the
RF circuitry
Analog supply
VDD
Supply voltage to the
digital circuitry
This is the supply voltage for the digital and control
circuitry of the XE1218A. It must be clean and de-
coupled properly.
This is the ground reference. VDD, VCCA and VCCR
are referenced to this pin.
This is the supply voltage for the analog section of the
XE1218A. It must be clean and de-coupled properly.
The XE1218A audio circuitry requires an internal
voltage multiplier. This multiplier requires and external
capacitor to be connected to VM
This pin must be connected to VDD
Digital supply
VSS
Ground reference
Digital ground
VCCA
Supply voltage to the
analog circuitry
External capacitor for
voltage multiplier
Analog supply
VM
Analog I/O
VCCO
Supply for audio
circuitry
Volume control
Supply input
VOL
This is used when the integrated PA is in use. An
external potentiometer (100k
to 1M
) will allow
varying the volume at the EAR output. 100k
will give
you a tuning range of 0dB to –10dB and 1M
will
equate to 0dB to –21.5dB
High impedance audio output: impedance = 10k
Earphone output, average 250mV, ±3dB, speaker
impedance must be between 200
and 1k
selected. An additional de-coupling capacitor is needed
for line out best performance
Analog input
OUT
EAR
Line out
Earphone out
Analog output
Analog output
AUD
Audio out de-coupling
Analog output
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