MTS/MDA Sensor Board Users Manual

MTS/MDA Sensor Board User’s Manual
NOTE: The resistors in positions R30 to R36 are 0 Ω resistors and would need to be removed when
soldering the corresponding resistor for that channel.
Table 7-2. Analog Inputs and Resistor Locations for Voltage Scaling.
ADC Channel R A R B
0 R36 R43
1 R35 R42
2 R34 R41
3 R33 R40
4 R32 R39
5 R31 R38
6 R28 R37
Figure 7-3. Photo of backside of the MDA300CA.
7.1.2 Differential Analog Signals (Channels A11 to A13)
Channels A11 to A13 can be used for differential analog signals. Dynamic range and conversion
formula are the same as the single ended channels.
7.1.3 Differential Precision Analog Signals (Channels A7 to A10)
Channels A7 to A10 are precision differential channels. They have a sensor front end with gain
of 100. Dynamic range of these channels is ±12.5 mV. The offset is cancelled by measurement
of the constant offset and writing it to the E2PROM for software cancellation. The result of the
ADC can be converted to voltage (in mV) knowing that
Voltage = 12.5 × (ADC_READING / 2048 − 1)
Scalingresistors
in
this area.
7.1.4 Digital Channels (Channels D0 to D5).
Channels D0–D5 are digital channels that can be used for digital input or output. They can be
used for counting external phenomena, triggering based on external events or for actuating
external signal.
Doc. # 7430-0020-05 Rev. A Page 27