TRC103 RFM, TRC103 Datasheet - Page 48

• Manufacturer Part Number: TRC103
• Description: RFIC TRANSCEIVER MULTI-CHANNEL F
• Manufacturer: RFM
• Series: TRCr

Specifications of TRC103

• Frequency: 863MHz ~ 960MHz
• Data Rate - Maximum: 100kbps
• Modulation Or Protocol: FSK, OOK
• Applications: General Purpose
• Power - Output: 11dBm
• Sensitivity: -112dBm
• Voltage - Supply: 2.1 V ~ 3.6 V
• Current - Receiving: 4mA
• Current - Transmitting: 30mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Other names: 583-1095-2

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
quency of 12.8 MHz:
Where F
RXCFG11 bits 7..4, and F is the integer value of the bit pattern in RXCFG13, which has a default value of 7. As-
suming this default value of F is used, 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 XTL1020P crystal. If an alternative crystal is used, add ½ the ex-
pected drift due to temperature and aging to the equation above. F
and the byte in RXCFG13. For the standard crystal frequency of 12.8 MHz:
Where F
bit pattern in RXCFG10 bits 3..0, and F is the integer value of the bit pattern in RXCFG13, which has a default
value of 7. Assuming this default value of F is used, 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
C filter bandwidth to the integer value in RXCFG10 bits 7..4 is given in Table 57. The matching values for the 125
and 150 kHz F
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K = (F
F
L = (F
F
F
J = (F
F
CPP
CPP
CRC
OPP
OPP
CPP
CPP
CRC
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, J is the integer value of the
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)/(F+1), with the usable range of J 0 to 1
= 200*(L + 1)/(F+1), with L in the range of 0 to 15
= 3.25*F
E-mail:
OPP
CPP
CTX
CCP
, is configured with bits 7..4 in RXCFG11 and the byte in RXCFG13. For the standard crystal fre-
OPP
- 125)/25
- 25)/25 = 3 for F
- 25)/25 = 11 for F
CPP
values are shown in bold.
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-
CPP
OPP
is limited to 2 discrete values: 125 kHz and 150 kHz. Choose the value of J
CTX
Pattern of Bits 7..4
= 100 kHz
= 300 kHz
Technical support +1.800.704.6079
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
CRC
is set by bits 7..4 in RXCFG10. The relationship of the R-
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
65 kHz
82 kHz
CPP
is configured with bits 3..0 in RXCFG10
TRC103 - 12/15/10
Page 48 of 64