PNI RM3000-F Sensor Suite - Manual (Page 6)

PNI Sensor Corporation Doc #1016102 r04
RM3000-f & RM2000-f Sensor Suite User Manual Page 6
3 Specifications
3.1 Geomagnetic Sensor Suite Characteristics
Table 3-1: Geomagnetic Sensor Suite Performance
1
Parameter Min Typical Max Units
Field Measurement Range
2
-800 +800 T
Gain @ 200 Cycle Counts
3
@ 2.8 V 55 counts/ T
@ 3.3 V 45 counts/ T
Sensitivity @ 200 Cycle Counts
3
22 nT/LSB
Noise @ 200 Cycle Counts
3
30 nT
Linearity - Best Fit over 200 T 0.6 1.0 % of 200 T
Max. Sample Rate per Axis @ 200 Cycle
Counts
4
475 Hz
Average Current per Axis @
35 Hz and 200 Cycle Counts
5
@ 2.8 V 0.20 mA
@ 3.3 V 0.25 mA
Bias Resistor (R
B
)
1.6 V to 2.2 V 60+(V-1.6)*67
2.2 V to 3.3 V 100
External Timing Resistor for Clock (R
EXT
) 33 k
Circuit Oscillation Frequency 195 kHz
High Speed Clock Frequency 45 MHz
Operating Temperature -40 +85 C
Notes:
1. Specifications subject to change. Unless otherwise noted, performance characteristics assume
the user implements the recommended bias resistors and high-speed-clock timing resistor, as
given in Figure 4-1, and the 3D MagIC ASIC is operated in Standard Mode. Other bias resistors,
external timing resistors and operating voltages may be used, but performance will differ.
2. Field measurement range is defined as the monotonic region of the output characteristic curve.
Field measurement range can be extended by using different bias resistors. For example, with
an 82
Ω bias resistor the field measurement range would be ±900 µT.
3. Sensitivity is the inverse of gain, and a single “cycle count” is equivalent to the least significant bit
or “LSB”. System noise limits useable sensitivity such that above ~200 cycle counts there are
diminishing returns on useable sensitivity.
4. The maximum sample rate and gain are inversely related, so higher sample rates can be
obtained by reducing the number of cycle counts, but this also diminishes gain and sensitivity.
5. Operating at reduced cycle counts will reduce current consumption, but also diminish sensitivity.
Operating at greater cycle counts increases power consumption but, due to noise, has
diminishing returns in terms of improving sensitivity.