Live demo — data resets daily at 03:00 UTC. Nothing you enter is saved.

TC-L-06 — SX1276 crystal XTA/XTB oscillation — amplitude, frequency and symmetry

open · Electrical

Measurement

NominalTolerance %Pass Criterion

Use a 10× scope probe. Note: XTA amplitude was previously measured at 520 mVpp — below the expected level and a disqualifier for reliable PLL operation on its own.

Check Pass criterion
Frequency (XTA or XTB) 32.000 MHz ± 10 ppm
Amplitude on XTA ≥ 800 mVpp sine wave
Amplitude on XTB Similar to XTA, ~180° phase shift
Symmetry XTA and XTB amplitudes within ~20% of each other. Asymmetric loading → suspect a load cap issue
Load capacitors Confirm BOM value matches schematic — correct load caps for crystal (typically ~20 pF per pin)
Crystal part Confirm correct part fitted — right frequency, right package (ECS-320-10-37B-CKY-TR3 on R0)

Pass: all rows above satisfied. Frequency within tolerance, amplitude ≥ 800 mVpp, symmetric on both pins.

Covers Requirements

CodeTitleStatus
REQ-053 Transceiver Clock approved