TRC105 RFM, TRC105 Datasheet - Page 49

• 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

The highest power setting allowed under the governing radio regulations is usually chosen unless the application
operates at short range and minimum DC power consumption is critical.
6.3 Determining Configuration Values for OOK Modulation
6.3.1 Bit Rate Related OOK Configuration Values
The TRC105 supports RF bit rates (data rates) from 1.5625 to 33.33 kb/s for OOK modulation. As with FSK
modulation, there are several considerations in choosing an OOK data rate. The sensitivity of the TRC105 de-
creases with increasing bit rate. A bit rate should be chosen that is adequate but not higher than the application
requires. The exception to this rule is when the TRC105 is operated as a frequency hopping spread spectrum
transceiver in a noisy or crowded band. Running at a higher bit rate will allow a higher channel hopping rate,
which provides more robust operation in a crowded band in tradeoff for less range under quiet band conditions.
The TRC105 RF bit rate is set by the value of the bytes loaded in MCFG03 and MCFG04. For the standard crys-
tal frequency of 12.8 MHz:
Where BR is the bit rate in kb/s, F
MCFG04. This bit rate value supports both the data and clock recovery circuit in the receiver and the bit rate
clocking in the transmitter modulator. Using the default value of D and solving the equation above for C:
C must be an integer value, so BR is limited to 256 discrete values. If the value of C given in the above equation
is not an integer for your desired bit rate, round the value of C down to the nearest integer. You can then calculate
the nearest available bit rate equal to or greater than your desired bit rate.
In OOK mode, the second IF frequency F
assumes F
Once BR and F
can be determined. The recommended 3 dB bandwidth for the transmitter anti-aliasing filters is:
F
Where F
pattern in TXCFG1A bits 7..4. The equation for determining K is:
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©2009-2010 by RF Monolithics, Inc.
CTX
is configured with bits 7..4 in TXCFG1A. For the standard crystal frequency of 12.8 MHz:
BR = 12800/(2*(C+1)*(D + 1)), with C in the range of 0 to 255, and D = 31 (default value)
C = (12800 - 64*BR)/64*BR
F
F
CTX
CTX
CTX
IF2
is the 3 dB bandwidth of the transmitter anti-aliasing filters in kHz and K is the integer value of the bit
= 3*F
= 200*(K + 1)/8, with K in the range of 0 to 15
E-mail:
is 100 kHz.
IF2
has been determined, the bandwidths and related configuration values for the TRC105 filters
IF2
[e-mail]
= 300 kHz
XTAL
Pattern of Bits 3..1
the crystal frequency in kHz, C the value in MCFG03, and D the value in
IF2
Technical support +1.800.704.6079
is normally set to 100 kHz. The discussion in the rest of this section
000
001
010
011
100
101
110
111
Table 60
Transmitter Power
13 dBm
10 dBm
-2 dBm
-5 dBm
-8 dBm
7 dBm
4 dBm
1 dBm
TRC105 - 11/01/10
Page 49 of 66