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PDF XE1205 Data sheet ( Hoja de datos )
| Número de pieza | XE1205 | |
| Descripción | High Link Budget Integrated UHF Transceiver | |
| Fabricantes | Semtech | |
| Logotipo |  |
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XE1205
XE1205
180 MHz – 1GHz
Low-Power, High Link Budget Integrated UHF Transceiver
GENERAL DESCRIPTION
The XE1205 is an integrated transceiver operating in
the 433, 868 and 915 MHz license-free ISM (Industrial,
Scientific and Medical) frequency bands; it can also
address other frequency bands in the 180-1000 MHz
range. 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 XE1205 offers the unique
advantage of narrow-band and wide-band
communication, this without the need to modify the
number or parameters of the external components.
The XE1205 is optimized for low power consumption
while offering high RF output power and channelized
operation suited for both the European (ETSI EN 300-
220-1) and the North American (FCC part 15)
regulatory standards. TrueRF™ technology enables a
low-cost external component count (elimination of the
SAW filter) whilst still satisfying ETSI and FCC
regulations.
APPLICATIONS
• Narrow-band and wide-band 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 Rx sensitivity: down to -121 dBm at 1.2 kbit/s,
-116 dBm at 4.8 kbits.
• Low power: RX=14 mA; TX = 62 mA @ 15 dBm
• Can accommodate 300-1000 MHz frequency range
• Wide band operation: up to 304.7 kbit/s, NRZ coding
• Narrow band operation: 25 kHz channels for data
rates up to 4.8 kbit/s, NRZ coding; optional
transmitter pre-filtering to enable adjacent channel
power below -37 dBm at 25 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
• FEI (Frequency Error Indicator) with built-in AFC
• RSSI (Received Signal Strength Indicator)
• 16-byte FIFO for transmit / receive data buffering
and transfer via SPI bus
ORDERING INFORMATION
Part number
Temperature range
XE1205I074TRLF(1) -40 °C to +85 °C
(1) TR refers to tape & reel.
LF refers to Lead Free package.
This device is WEEE and RoHS compliant
Package
VQFN48
Rev 10 December 2008
1
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1 page  
XE1205
4 ELECTRICAL CHARACTERISTICS
4.1 ABSOLUTE MAXIMUM OPERATING RANGES
Stresses above the values listed below may cause permanent device failure. Exposure to absolute maximum ratings for
extended periods may affect device reliability.
Symbol
VDDmax
Tmr
ML
Description
Supply voltage
Storage temperature
Receiver input level
Min.
-0.5
-55
Table 2: Absolute Maximum Operation Ranges
The device is ESD sensitive and should be handled with precaution.
4.2 SPECIFICATIONS
4.2.1 Operating Range
Max.
3.9
125
5
Unit
V
°C
dBm
Symbol
VDDop
Trop
Clop
Description
Supply voltage
Temperature
Load capacitance on digital ports
Table 3: Operating Range
Min.
2.4
-40
-
Max.
3.6
85
25
Unit
V
°C
pF
4.2.2 Electrical Specifications
The table below gives the electrical specifications of the transceiver under the following conditions:
Supply Voltage = 3.3V, temperature = 25 °C, 2-level FSK without pre-filtering, fc = 915 MHz, Δf = 5 kHz,
Bit rate = 4.8 kbit/s, BWSSB = 10 kHz, BER = 0.1% (at the output of the bit synchronizer), matched impedances,
environment as defined in section 8, unless otherwise specified.
Symbol Description
IDDSL Supply current in sleep mode
Conditions
Min Typ
- 0.2
Max
1
Unit
uA
IDDST
IDDR
IDDT
Supply current in standby mode
Supply current in receiver mode
Supply current in transmitter mode
Quartz oscillator (39 MHz)
enabled
RFOP = 5 dBm
RFOP = 15 dBm
- 0.85 1.10
- 14 16.5
- 33
40
- 62
75
mA
mA
mA
mA
RFS
RF sensitivity
Mode A
Mode B
- -116 -113
- -102
-99
dBm
dBm
RFS_12
FDA
CCR
IIP3
BW
RF sensitivity at 1.2 kbit/s
Mode A
Mode B
Frequency deviation
Programmable
Co-channel rejection
Input intercept point (from LNA input funw = fLO + 1 MHz and
to base-band filter output)
fLO + 1.995 MHz
Mode A
Mode B
Base band filter bandwidth (SSB) Programmable (1)
- -121
- -107
1-
-13 -10
-118
-104
255
-
-37 -33
-21 -18
- 10
- 20
-
-
-
-
dBm
dBm
kHz
dBc
dBm
dBm
kHz
kHz
- 40
-
kHz
- 200
-
kHz
© Semtech 2008
www.semtech.com
5
5 Page 
XE1205
where OSR(7:0) is the content of the register; TParam_OSR(7:0) as described in section 7.2.8.
For a correct operation of the bit synchronizer, the value of this register must be higher or equal to 15 and
(int(OSR)+1) * Bit_rate should be inferior or equal to 4.87MHz.
5.2.3.3 Pattern recognition block in continuous mode
In receive mode this feature is activated by setting the RXParam_Pattern configuration register bit to high. The
demodulated signal is compared with a pattern stored in the Reg_pattern(31:0) registers. The PATTERN signal (mapped
to output pin IRQ_0) is driven by the output of this comparator and is synchronized by DCLK. It is set to high when a
matching condition is detected, otherwise set to low. PATTERN output is updated at the rising edge of DCLK. The
number of bits used for comparison is defined in the RXParam_Psize(1:0) register and the number of tolerated errors for
the pattern recognition is defined in the RXParam_Ptol(1:0) register. Figure 4, illustrates the pattern matching process.
DATA
(NRZ)
Bit N-x =
Reg_pattern[x]
DCLK
Bit N-1 =
Bit N =
Reg_pattern[1] Reg_pattern[0]
PATTERN
Figure 4: Pattern matching operation.
Note: The pattern recognizer is available only if the bit synchronizer is enabled.
5.2.3.4 RSSI in continuous mode
This function provides a Received Signal Strength Indication based on the signal level at the output of the base-band
filter. To activate this function, the bit RXParam_RSSI must be set to “1”. When activated, the 2-bit status information is
stored in register RXParam_RSSI_OUT(1:0) and may be read through the serial control interface. The meaning of this
status information is given in the table below, where VRFFIL is the differential amplitude of the equivalent input RF signal
when the receiver is operated in mode A. The thresholds VTHRi are at the output of the base-band filter divided by the
gain between the input of the receiver and this output. When operated in mode B, equivalent VTHRi thresholds are
shifted 15dBm higher.
RXPARAM_RSSI_out(1:0) Description
0 0 VRFFIL ≤ VTHR1
0 1 VTHR1 < VRFFIL ≤ VTHR2
1 0 VTHR2 < VRFFIL ≤ VTHR3
1 1 VTHR3 < VRFFIL
Table 7: RSSI status description
The operating range of the RSSI measurement may be changed by programming the RXParam_RSSI_range bit; in this
way two ranges with three VTHRi values may be selected. An additional way to increase RSSI operating range is to
combine modes A and B thresholds. One could then cover input signals ranging from -110dBm (VTHR1, low range,
mode A) up to -70dBm (VTHR3, high range, mode B)
© Semtech 2008
www.semtech.com
11
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| PDF Descargar | [ Datasheet XE1205.PDF ] | |
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