TRC101 Просмотр технического описания (PDF) - RF Monolithics, Inc

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TRC101

300-1000 MHz RF Transceiver

RF Monolithics, Inc 

Receiver Control Register (continued)

Bit [7..5] – Receiver Baseband Bandwidth: These bits set the baseband bandwidth of the demodulated

data. The bandwidth can accommodate different FSK deviations and data rates. See Table 12 for

bandwidth configuration.

Table 12.

Baseband BW (kHz) BB2 BB1 BB0

Resvd

000

400

001

340

010

270

011

200

100

134

101

67

110

Reserved

111

Bit [4..3] – Receiver LNA Gain: These bits set the receiver LNA gain, which can be changed to

accommodate environments with high interferers. The LNA gain also affects the true RSSI value. Refer

to Bit [2..0] for RSSI. See Table 13 below for gain configuration.

Table 13.

LNA GAIN (dB)

0

-14

-6

-20

GAIN1

0

0

1

1

GAIN0

0

1

0

1

Bit [2..0] – Digital RSSI Threshold: The digital receive signal strength indicator threshold may be set to

indicate that the incoming signal strength is above a preset limit. The result is stored in bit 7 of the status

register. There are eight (8) predefined thresholds that can be set. See Table 14 below for settings.

RSSI Thresh

-103

-97

-91

-85

-79

-73

-67

-61

Table 14.

RSSI2

0

0

0

0

1

1

1

1

RSSI1

0

0

1

1

0

0

1

1

RSSI0

0

1

0

1

0

1

0

1

The RSSI threshold is affected by the LNA gain set value. Calculate the true RSSI set threshold when

the LNA gain is set to a value other than 0 dB as:

RSSI = RSSIthres + |GainLNA|

20

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