SX1242 Просмотр технического описания (PDF) - Semtech Corporation
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SX1242 Datasheet PDF : 14 Pages
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ADVANCED COMMUNICATIONS & SENSING
SX1242
Integrated Transmitter IC
DATASHEET
2.4. Electrical Specifications
The table below gives the electrical specifications of the transmitter under the following conditions: Supply voltage = 3.3 V,
temperature = 25 °C, fXOSC = 26 MHz, fRF = 344.94 MHz, bit rate = 5 kbit/s and output power = +12 dBm terminated in a
matched 50 ohm impedance, unless otherwise specified.
Table 4 Transmitter Specifications
Symbol Description
Conditions
Min
Current Consumption
IDDSL
Supply current in sleep mode
-
IDDT
Supply current in transmit mode
Logic “1” or “Mark” frequency trans-
-
with appropriate external match- mitted*
ing.
RF and Baseband Specifications
BRO
Bit rate, OOK
Permissible range
0.5
OOK_B OOK modulation depth
-
RFOP
RF output power into 50 ohms
Optimized matching network
9
DRFOPV Variation in RF output power with
supply voltage
2.5 V to 3.3 V -
1.8 V to 3.7 V -
PHN
Transmitter phase noise
100 kHz Offset from carrier
-
FCN
Carrier frequency
-
FXOSC Crystal Oscillator Frequency
26
DFXOSC Frequency Variation of the Oscilla- No crystal contribution
-
tor Circuit
Timing Specifications
TS_TR
Time from Sleep to Tx mode
-
RAMP
PA Ramp up and down time**
-
Typ
Max Unit
0.5
1 µA
22
- mA
-
50
12
-
-
-
344.94
26
-
10 kbps
- dB
- dBm
3 dB
7 dB
-76 dBc/Hz
- MHz
26 MHz
+/-25 ppm
-
2 ms
20
- us
* Logic “1” transmission indicated by transmission of carrier frequency at power level RFOP.
** Ramp-up time of the internal regulator turning the PA on. The typical 10% - 90% power ramp-up time is 10us
SX1242, Rev 1, November 2010
©2010 Semtech Corp.
Page 6
www.semtech.com
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