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

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TRC101

300-1000 MHz RF Transceiver

RF Monolithics, Inc 

Automatic Frequency Adjust Register (continued)

Bit [5..4] – Allowable Frequency Offset: These bits select the amount of offset allowable between

Transmitter and Receiver frequencies. The allowable range can be specified as in Table 6 below.

TABLE 6.

Freq Offset Range RNG1

No Limit

0

+15*fres/-16*fres 0

+7*fres /-8*fres

1

+3*fres /-4*fres

1

RNG0

0

1

0

1

where fres is the tuning resolution for each band as follows:

fres: 315 MHz Band = 2.5kHz

433 MHz Band = 2.5kHz

868 MHz Band = 5kHz

916 MHz Band = 7.5kHz

Bit [3] – Manual Frequency Adjustment Strobe: This bit is the strobe signal that initiates a manual

frequency adjustment sample. When set, a sample of the received signal is compared to the Receiver

LO signal and an offset is calculated. If enabled, this value is written to the Offset Register (See Bit [1])

and added to the frequency control word of the PLL. This bit MUST be reset before initiating another

sample.

Bit [2] – High Accuracy (Fine) Mode: This bit, when set, switches the frequency adjustment mode to

high accuracy. In this mode the processing time is twice the regular mode, but the uncertainty of the

measurement is significantly reduced.

Bit [1] – Frequency Offset Register Enable: This bit, when set, enables the offset value calculated by

the offset sample to be added to the frequency control word of the PLL that tunes the desired carrier

frequency.

Bit [0] – Offset Frequency Enable: This bit, when set, enables the TRC101 to calculate the offset

frequency by the sample taken from the Automatic Frequency Adjustment circuit.

15

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