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Data format
CC1070 can be configured for three different data formats: Synchronous ‘NRZ’, Synchronous
‘Manchester’ or ‘Asynchronous UART’. The data formats refer to the encoding used when
modulating the signal, either NRZ (Non-Return-to-Zero) data or Manchester encoded data
(also known as bi-phase-level) can be used. In the synchronous modes CC1070 provide the
data clock at DCLK.
When Manchester mode is selected, the output signal will be modulated even if no signal is
connected to the DI line. This is because the Manchester coding of the data is done by the
CC1070. Therefore the DI signal should be NRZ coded even when Manchester mode is
selected.
RF output power
For the CC1070 the output RF power can be set in 1 dB steps between -20 to 10 dBm. For
frequencies higher than 500 MHz the upper limit is 8 dBm.
Power in dBm is 10 log (P) where P is in mW. The default value is 0 dBm.
Modulation
CC1070 can modulate FSK, GFSK or OOK/ASK. Using GFSK the data is shaped, using a
Gaussian filter before FSK modulation, in order to improve the occupied bandwidth. OOK is a
type of amplitude modulation used in digital systems where the RF carrier is turned on and off
in order to modulate the data.
In a fractional-N synthesizer, spurious signals can occur at certain frequencies depending on
the division ratios in the PLL. To reduce the strength of these spurs the Dithering can be
enabled.
SmartRF® Studio User Manual (rev. 6.0)