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SPIRIT1 Datasheet(PDF) 46 Page - STMicroelectronics

Part # SPIRIT1
Description  Low data rate, low power sub-1GHZ transceiver
PDF  94 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

SPIRIT1 Datasheet(HTML) 46 Page - STMicroelectronics

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Transmission and reception
SPIRIT1
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Doc ID 022758 Rev 3
Equation 2
This allows the setting of up to 256 channels with a programmable raster. The raster
granularity is about 793 Hz at 26 MHz and becomes about 1587 Hz at 52 MHz.
The actual channel spacing is from 793 Hz to 202342 Hz in 793 Hz steps for the 26 MHz
configuration and from 1587 to 404685 Hz in 1587 Hz steps for the 52 MHz configuration.
The base carrier frequency, i.e. the carrier frequency of channel #0, is controlled by the
SYNT0, SYNT1, SYNT2, and SYNT3 registers according to the following formula:
Equation 3
where:
●
fXO is the frequency of the XTAL oscillator (typically 24 MHz, 26 MHz, 48 MHz, or 52
MHz)
●
SYNT is a programmable 26-bit integer.
Equation 4
Equation 5
The offset frequency is a correction term which can be set to compensate the crystal
inaccuracy after e.g. lab calibration.
Equation 6
where:
●
FC_OFFSET is a 12-bit integer (expressed as 2's complement number) set by the
FC_OFFSET[1:0] registers
Furthermore, the selection between VCOH (“high”) and VCOL (“low”) in the frequency
synthesizer according to the band selected and the VCO threshold is required.
If the center frequency is below the frequency threshold for that frequency band, the VCO_L
must be selected by setting the bit 2 VCO_L_SEL field in the SYNTH_CONFIG register.
CHNUM
CHSPACE
2
f
f
f
f
15
XO
offset
base
c
⋅
⎟
⎠
⎞
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2
SYNT
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1 if REFDIV 0 (internal reference divider is disabled)
2 if REFDIV 1 (internal reference divider is enabled)
⎩
⎨
⎧
=
OFFSET
_
FC
2
f
f
18
XO
offset
⋅
=



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