SX1213 datasheet(21/65 Pages) SEMTECH

21 / 65 page

SX1213

ADVANCE

Rev.2 – July 1

st, 2009

Page 21 of 65

www.semtech.com

D COMMUNICATIONS & SENSING

Butterworth Filter's BW, FSK

100

150

200

250

300

350

400

450

Val (RXParam_ButterFilt) [d]

Actual

Theoretical

Figure 12: Butterworth Filter's Actual BW

Error! Reference source not found.

suggests filter settings in FSK mode, along with the corresponding passive

filter bandwidth and the accepted tolerance on the crystal reference.

3.3.6. Channel Filters Setting in OOK Mode

The center frequency, fo, is always set to 100kHz. The following chart shows the receiver bandwidth when

changing RXParam_Butterfilt bits, whilst the polyphase filter is activated.

Polyphase Filter's BW, OOK

200

250

300

350

400

450

100

150

Val (RXParam_ButterFilt [d]

RXParam_PolypFilt="0011"

Actual

Theoretical

Figure 13: Polyphase Filter's Actual BW

Error! Reference source not found.

suggests a few filter settings in OOK mode, along with the corresponding

passive filter bandwidth and the accepted tolerance on the crystal reference.

3.3.7. RSSI

After filtering, the In-phase and Quadrature signals are amplified by a chain of 11 amplifiers, each with 6dB gain.

The outputs of these amplifiers are used to evaluate the Received Signal Strength (RSSI).

3.3.7.1. Resolution and Accuracy

Whilst the RSSI resolution is 0.5 dB, the absolute accuracy is not expected to be better than +/- 3dB due to process

and external component variation. Higher accuracy whilst performing absolute RSSI measurements will require

additional calibration.

3.3.7.2. Acquisition Time

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