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Comparator module
104
PRELIMINARY V1.8
17. Comparator module
17.1.
General Information
The comparator module converts an incoming analog signal from the RF receiver into a
digital signal used as input by the internal digital correlators of the SSTM. This module
performs as a 1-bit A/D converter.
When the comparator is enabled it will automatically be placed in the path between the
DI input for the SS1102C and the DI input of the internal SSTM module. With the
DIREF input this allows the user to input analog DI and a DIREF which is the converted
to a digital input to the SSTM module. When the comparator is disabled (default) the DI
input of the SS1102C is connected directly to the DI input of the SSTM module and a
digital signal is expected.
In this section, a general description of the comparator module is given. This includes a
functional description, a block diagram, pin names and definitions, and all the signals
necessary for the block and their timing.
17.2.
Functional Description
This comparator is a a rail to rail, single supply comparator. It is also high speed and
low power. In this comparator, both inputs can change. It has the following features:
TABLE 75.
Comparator Main Features
supply voltage (Vdd)
2.7 - 3.3 V and 4.5 - 5.5 V
conversion time
100 - 200 nS
input offset voltage
1 - 2 mV
current usage (in active
mode)
1 mA max. for 3.3V and 5 mA
max. for 5.5 V supply
current usage (in sleep
mode)
negligible
input voltage range
0 to supply voltage
output voltage range
rail to rail
temperature range
-20 - +85
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