TRC105 RFM, TRC105 Datasheet - Page 13

• Manufacturer Part Number: TRC105
• Description: IC TXRX 300MHZ-510MHZ 32TQFN
• Manufacturer: RFM

Specifications of TRC105

• Frequency: 300MHz ~ 510MHz
• Data Rate - Maximum: 200kbps
• Modulation Or Protocol: FSK, OOK
• Applications: General Purpose
• Power - Output: 13dBm
• Sensitivity: -112dBm
• Voltage - Supply: 2.1 V ~ 3.6 V
• Current - Receiving: 3mA
• Current - Transmitting: 30mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-TQFN
• Wireless Frequency: 300 MHz to 510 MHz
• Output Power: 13 dBm
• Operating Supply Voltage: 2.1 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Maximum Supply Current: 1.7 mA
• Minimum Operating Temperature: - 40 C
• Modulation: FSK, OOK
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 583-1159-2

As shown in Figure 7, the demodulator section includes the FSK demodulator, the OOK demodulator, data and
clock recovery and the start pattern detection blocks.
If FSK is selected, the demodulation is performed by analyzing the phase between the I and Q limited signals at
the output of the base-band channels.
If OOK is selected, the demodulation is performed by comparing the RSSI output value stored in RXCFG14_
RSSI[7..0] register to the threshold which can be either a fixed value or a time-variant value depending on the
past history of the RSSI output. Table 9 gives the three main possible procedures, which can be selected via the
register MCFG01_RX_OOK[3..2]:
If the end-user application requires direct access to the output of the demodulator, then the RXCFG12_DCLK_
Dis[6] bit is set to 1 disabling the clock recovery. In this case the demodulator output is directly connected to the
DATA pin and the IRQ1 pin (DCLK) is set to low.
For proper operation of the TRC105 demodulator in FSK mode, the modulation index
meet the following condition:
where F
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DEV
Fixed Threshold
is the frequency deviation in hertz (Hz) and BR is the data rate in bits per second (b/s).
E-mail:
Average
Mode
Peak
[e-mail]
MCFG01_RX_OOK[3..2]
00
01
10
β =
Technical support +1.800.704.6079
2*F
BR
RSSI output is compared with a fixed threshold stored in
RXCFG13_OOK_thresh
RSSI output is compared with a threshold which is at a fixed offset
below the maximum RSSI.
RSSI output is compared with the average of the last RSSI values.
DEV
Figure 7
Table 9
≥ 2
Description
β
of the input signal should
TRC105 - 11/01/10
Page 13 of 66