TRC105 RFM, TRC105 Datasheet - Page 50

• 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

K = (F
For OOK operation, the receiver filters are configured as polyphase band-pass filters by setting RXCFG12 bit 7 to
1. The center frequency of the polyphase filters is set to 100 kHz to match the second IF frequency. The center
frequency, F
Where F
RXCFG11 bits 7..4. The equation for determining L is:
The recommended upper cutoff frequency for the receiver polyphase band-pass filters is:
Where F
tion assumes use of the high accuracy, low drift XTL1020 crystal. If an alternative crystal is used, add ½ the ex-
pected drift due to temperature and aging to the equation above. F
For the standard crystal frequency of 12.8 MHz:
Where F
the bit pattern in RXCFG10 bits 3..0. The equation for determining J is:
J must be an integer value, so F
that provides the F
mended 3 dB bandwidth for the receiver R-C filters is:
Where F
R-C filter bandwidth to the integer value in RXCFG10 bits 7..4 is given in Table 61. The matching values for the
125 and 150 kHz F
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CTX
F
L = (F
F
F
J = (F
F
CPP
CPP
CRC
OPP
OPP
CPP
CPP
CRC
- 25)/25 = 11 for F
is the upper cutoff frequency of the polyphase filters in kHz and BR is the bit rate in kb/s. This equa-
is the upper cutoff frequency of the receiver OOK polyphase filter in kHz and J is the integer value of
and F
OPP
is the center frequency of the OOK polyphase filter in kHz, L is the integer value of the bit pattern in
= F
= 100 + 200*(J + 1)/8, with the usable range of J 0 to 1
= 200*(L + 1)/8, with L in the range of 0 to 15
= 3.25*F
E-mail:
OPP
CPP
, is configured with bits 7..4 in RXCFG11. For the standard crystal frequency of 12.8 MHz:
OPP
- 125)/25
- 25)/25 = 3 for F
CPP
CCP
CCP
[e-mail]
+ BR
are in kHz. The bandwidth of F
CPP
value that is nearest to the value calculated for the bit rate you are using. The recom-
values are shown in bold:
CTX
= 300 kHz
CPP
OPP
is limited to 2 discrete values: 125 kHz and 150 kHz. Choose the value of J
Pattern of Bits 7..4
= 100 kHz
Technical support +1.800.704.6079
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
CRC
Table 61
is set by bits 7..4 in RXCFG10. The relationship of the
R-C Filter Bandwidth
109 kHz
137 kHz
157 kHz
184 kHz
211 kHz
234 kHz
262 kHz
321 kHz
378 kHz
414 kHz
458 kHz
514 kHz
676 kHz
987 kHz
65 kHz
82 kHz
CPP
is configured with bits 3..0 in RXCFG10.
TRC105 - 11/01/10
Page 50 of 66