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PDF XE1202A Data sheet ( Hoja de datos )
| Número de pieza | XE1202A | |
| Descripción | Integrated UHF Transceiver | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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XE1202A TrueRF™
www.DataSheet4U.com
RFA
RFB
RFOUT
IAmp
QAmp
LNA
LO
Buff.
PA
I
AMP
BPF
Q AMP
BPF
AMP
Limiter
AMP
Limiter
FSK
Demod.
Bit
Sync.
Phase
Shifter
Prog.
divider
VCO
PFD
RSSI
FEI
modulator
/n Synthesizer
Oscillator
/n
Clock Out
Pattern
Recognition
Control
Logic
POR
I Ref
SCAN
DCLK
DATAOUT
PATTERN
MODE 0
MODE 1
MODE 2
SI
SO
SCK
EN
DATAIN
XE1202A TrueRF™
433 MHz / 868 MHz / 915 MHz
Low-Power, Integrated UHF Transceiver
GENERAL DESCRIPTION
The XE1202A TrueRF™ is a single chip transceiver
operating in the 433, 868 and 915 MHz license free
ISM (Industry Scientific and Medical) frequency
bands. Its highly integrated architecture allows for
minimum external components while maintaining
design flexibility. All major RF communication
parameters are programmable and most of them can
be dynamically set. The XE1202A TrueRF™ offers a
wide range of channel bandwidths, without the need
to modify the number or parameters of the external
components. The XE1202A TrueRF™ is optimized for
low power consumption whilst offering high RF output
power and channelized operation suitable for both the
European (ETSI-300-220) and the North American
(FCC part 15) regulatory standards.
APPLICATIONS
Security systems
Voice and data over an RF link
Process and building control
Access control
Home automation
Home appliances interconnection
KEY PRODUCT FEATURES
Programmable RF output power: up to +15 dBm
High reception sensitivity: down to –116 dBm
Low power consumption: RX = 14 mA;
TX = 62mA @15 dBm output power
Supply voltage down to 2.4 V
Data rates from 4.8 kbits/s to 76.8 kbits/s, NRZ
coding
Channel filter bandwidths from 20 kHz to 400 kHz
On-chip frequency synthesizer with minimum
frequency resolution of 500 Hz
Continuous phase 2-level FSK modulation
Incoming data pattern recognition
Built-in Bit-Synchronizer for incoming data and clock
synchronization and recovery
RSSI (Received Signal Strength Indicator) and FEI
(Frequency Error Indicator)
ORDERING INFORMATION
Part number
Temperature range
XE1202AI027TRLF -40 °C to +85 °C
Package
LQFP44
Rev 1 January 2006
www.semtech.com
1 page  
XE1202A TrueRF™
www3.DatEaSlheeect4tUr.iccomal Characteristics
3.1 Absolute Maximum Operating Ranges
Stresses above those values listed below may cause permanent device failure. Exposure to absolute maximum
ratings for extended periods may affect device reliability.
Symbol
Description
Min.
VDDmax Supply voltage
-0.4
ML Receiver input level
Tmax
Storage temperature
-55
Table 2: Absolute Maximum Operating Ranges
The device is ESD sensitive and should be handled with precaution.
3.2 Specifications
3.2.1 Operating Range
Max.
3.9
-5
125
Unit
V
dBm
°C
Symbol
Description
Min.
Max.
Unit
VDD
T
Supply voltage
Temperature
2.4 (*)
-40
3.6
85
V
°C
CLop
Load capacitance on digital ports
- 25 pF
Table 3: Operating Range
(*) For narrow-band configurations (base-band filter bandwidths of 10, 20 and 40 kHz), the minimum operating
supply voltage is 2.4 V. For 200 kHz base-band filter bandwidth setting the minimum operating supply voltage is 2.7
V.
3.2.2 Electrical Specifications
The table below gives the electrical specifications of the transceiver under the following conditions:
Supply Voltage = 3.3 V, temperature = 25 °C, 2-level FSK without pre-filtering, fC = 434, 869 and 915 MHz,
∆f = 5 kHz, Bit rate = 4.8 kbits/s, BWSSB = 10 kHz, BER = 1 % (measured at the output of the bit synchronizer), LNA
input and PA output matched to 50 Ω, environment as defined in section 6, unless otherwise specified.
Symbol
IDDSL
IDDST
IDDR
IDDT
RFS
FDA
CCR
Description
Supply current in sleep mode
Supply current in standby
mode
Supply current in receive
mode
Supply current in transmitter
mode
RF sensitivity 869 / 915 MHz
Conditions
Crystal oscillator (39 MHz)
enabled
RFOP = 5 dBm
RFOP = 15 dBm
A-mode
B-mode
Min
-
-
-
-
-
-
RF sensitivity 434 MHz
A-mode
B-mode
-
Frequency deviation
Programmable
Co-channel rejection
-
-
-
-
-
-13
Typ
0.2
0.85
14
33
62
-116
-103
-114
-100
5
10
20
40
100
-10
Max
1
1.10
16.5
40
75
-113
-100
-111
-98
-
-
-
-
-
-
Unit
µA
mA
mA
mA
mA
dBm
dBm
dBm
dBm
kHz
kHz
kHz
kHz
kHz
dBc
© Semtech 2006
6
www.semtech.com
5 Page 
XE1202A TrueRF™
The modulation index, b, of the modulated carrier should meet the following condition:
www.DataSheβet4=U.2c⋅o∆mf ≥ 2,
BR
where ∆f is the frequency deviation and BR is the bit rate.
The bandwidth of the baseband filter (BBW) must be greater than the sum of the frequency offset and the received
signal bandwith, as defined below:
BBW > fOFFSET + BWSIGNAL
where BBW is the baseband filter bandwidth defined by the RTParam_BW parameter (see the Configuration
Registers section below), fOFFSET is the difference between the carrier frequency and the LO frequency, and
BWSIGNALis
equal
to
⎜⎛ BR
⎝2
+ ∆f
⎟⎞ .
⎠
The FEI function has two modes of operation, defined by the value set in the register “RTParam_Fsel” (see the
Configuration register section below).
4.1.4.1 “RTParam_Fsel” = 1
With the “RTParam_FEI” bit set to “1” and the “RTParam_Fsel” bit set to “1”, the FEI uses frequency correlation to
provide a 2-bit status word, which is stored in the register “DataOut_FEI”. The contents of this register are defined
below in Table 7. The status of this register is provided in the following table, where fLO is the internal local oscillator
frequency, and fRF is the carrier frequency of the received signal.
DataOut_FEI
00
01
10
11
Meaning
⏐fLO-fRF⏐ ≤ fERR
-
(fLO-fRF) > fERR
(fLO-fRF) < -fERR
Table 7: FEI status description
The value fERR = FERR * BR, where BR is the bit rate and FERR is a ratio given in the electrical specifications. As
an example, for a bit rate of 4.8kbits/s and with FERR = 0.5, fERR is 2.4 kHz.
The FEI-Correlator function works properly only if the input signal is the preamble sequence defined under the
Receiver section above, and if the frequency error to be detected is lower than 20 kHz.
The time diagram of an FEI measurement is similar to that of an RSSI measurement, and is illustrated in Figure 4
below. When the FEI is enabled, the frequency error is periodically measured and the result is stored in the register
“DataOut_FEI” at each rising edge of DATAIN. TS_FE is the wake-up time required after the function has been
enabled to obtain a valid result. For a proper operation, the pulse length on DATAIN has to be higher than 8µs.
© Semtech 2006
12
www.semtech.com
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