Cool Solutions for Wireless Connectivity
XEMICS SA, Switzerland Tel: +41 32 720 55 11 Fax: +41 32 720 57 70. info@xemics.com www.xemics.com
OSC
FM
Demodulator
AFC
Muting
LNA
XE1218
Datasheet
XE1218 Single Chip Receiver
FM 130 - 230 MHz
Low-Power VHF Receiver
Features
Ultra low voltage operation : down to 1 Volt
Ultra low-power consumption : 2 mA
Highly integrated single chip audio receiver
: antenna in, loudspeaker out
High sensitivity : -107 dBm
AFC range +/- 10 kHz
Mute
function
6 kHz audio bandwidth
45 dB Audio SNR
Integrated audio amplifier
Applications
Toys
Local/Wide area voice paging
FM broadcasting miniature receiver
Wireless phone headset
Ordering Information
Part
Temperature range
Pin-package
XE1218
-10 to 55
C
Naked die form
General Description
The XE1218 is a single chip ultra low-power VHF
FM receiver. The circuit includes the RF receiver
section, the demodulator and the audio amplifier
that is directly connected to an external earpiece. It
uses analog narrow-band FM modulation.
The XE1218 is based on a low-IF architecture, with
on-chip channel filter and a delay line type
demodulator.
The LO is generated by a crystal oscillator.
Quick Reference Data
Supply voltage
1 to 1.6 V
Current consumption 2 mA
Modulation
Narrow-band
FM
Sensitivity
-107
dBm
Carrier frequency
130 230 MHz
XE1218
Ultra Low Power VHF Receiver
2
D0010-80
Detailed Pin Description
PIN
NAME
DESCRIPTION
TYPE
1
LOP
LO tank connexion
A
2
LON
LO tank connexion
A
3
XTALP
Crystal pin
A
4
XTALN
Crystal pin
A
5
RFTANK
LNA tank connexion
A
6
RFVCC
Positive supply voltage of receiver front-end
P
7
RFIN
RF input
A
8
RFGND
Antenna ground node
P
9
MUTE
Mute digital output
D
10
IFTEST
Testpad IF amplifier
A
11
VM
Buffer capacitance
A
12
OUTH
High impedance audio output (10 kOhms)
A
13
OUTL
Low impedance audio output (<250 Ohms)
A
14
VOL
Volume control
A
15
DIR
High pass output filter ON/OFF
16
BW4K
Audio output filter 4kHz ON/OFF
17
PM
Low-Pass output filter (PM) ON/OFF
18
VSS
Analog and digital negative supply voltage
P
19
STAB
Decoupling pin for audio stage
A
20
VREG
Input of regulated voltage (for Standby mode)
A
21
VDD
Analog and digital positive supply voltage
P
22
EAR
Audio output for headphone
A
Absolute Ratings
-
supply voltage 1 V to 2 V
-
operating temperature range -10 to 40 C
-
storage temperature -55C to 150C
XE1218
Ultra Low Power VHF Receiver
3
D0010-80
Electrical Characteristics
Tamb = 25 C; VDD = 1.25 V, Temp=25 C, f
RFIN
=160 MHz, unless otherwise specified.
Symbol
Parameters
Conditions
Min
Typ
Max
Unit
VDD
Power supply
1
1.25
1.6
IDD_REC
Supply current
Receiver ON
-
2
mA
IDD_STDB
Supply current in standby
-
-
100
A
RFIN
Input carrier frequency
range
130
-
230
MHz
FDEV
Frequency deviation
-
-
8
kHz
RFS
RF input sensitivity
f
mod
= 1 kHz, f
dev
= 3 kHz,
SINAD = 10 dB,
-92
-105
dBm
ACR
Adjacent channel rejection
f
unw
= f
RFIN
+ 100 kHz,
f
mod
= 1 kHz, f
dev
= 3 kHz,
Pin=RFS+10 dB,
SINAD=10 dB
-
50
-
dB
AOB
Audio 3 dB bandwidth on
output EAR
f
dev
= 3 kHz
0.1
-
6
kHz
AOD
Audio distorsion on output
EAR
f
mod
= 1 kHz, f
dev
= 5 kHz,
Rvol = 100 kOhms,
Pin = -60 dBm, BW = 20 kHz
-
2
8
%
ASN
Audio SNR on output EAR
f
mod
= 1 kHz, f
dev
= 3 kHz,
Rvol = 100 kOhms,
Pin = -60 dBm, BW = 6 kHz
42
45
-
dB
DCEAR
DC voltage on output EAR
Vdd = 1.3 V
200
-
300
mV
LOD
LO shift
Temperature drift and aging of
crystal not taken into account
-
-
15
ppm
XE1218
Ultra Low Power VHF Receiver
4
D0010-80
Block diagram and typical application
Components list for F=171 MHz
Component
Type
Value
XTAL1
Overtone crystal, serial
resonnance
Ex. F=171.525
Cs=0.17 fF, Rs<120 Ohms
Q>40000, Cp = 3.2 pF
L1
0.15 uH
L2
0.18 uH
L3
0.18 uH
C1
10 pF
CTRIM2
2.5 pF
CTRIM3
3.2 pF
C4
1 nF
C5
10 nF
CTRIMA
6.4 pF
R1
0-100K ohm
OSC
FM
Demodulato
Demodulato
AFC
Muting
LNA
VOL
EAR
C4
R1
L2
XTALP
XTALN
RFIN
RFGND
LOP
LON
L3
CTRIM3
XTAL1
CTRIM2 L1
RFVCC
RFTANK
C6
VDD VREG
STAB
VSS
PM
BW4K
OUT_L
OUT_H
DIR
VM
C5
IFTEST
MUTE
C1
CTRIMA
XE1218
Ultra Low Power VHF Receiver
5
D0010-80
LNA and antenna matching network
See application diagram above
Note: For test purpose, the antenna and its matching network is replaced by the following set-up
50
1:1
RFIN
RFGND
RF
generator
180 nH
6 pF
20 pF
68 pF
ASIC
RF and LO tank
See application diagram above
Crystal
The typical characteristics of a crystal used for the LO generation are the following:
- Supplier:
Telequarz,
-
Type: HSLX5132 or HSLX5134 (7
th
overtone),
- Frequency: 160.275
MHz,
-
Motional capacitance Cs = 0.2 fF
0.15 fF,
-
Calibration tolerance at 25 C:
10 ppm,
-
Stability over temperature range:
5 ppm,
-
Aging in the first year:
3 ppm.
PDF 
ZIP