Microchip Technology MCP6N16, Руководство пользователя, Страница: 12 / 36

MCP6N16 Evaluation Board User’s Guide
DS50002365A-page 12
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2015 Microchip Technology Inc.
1.3.2 Sensor Connector
The sensor connector, J5, is a 6-pin screw terminal configured to accommodate a
variety of sensors. Bridge-type sensors can have their excitation voltage connected to
either the V
DUT
supply of the evaluation board or to another externally-supplied source.
In addition, the connector provides sense line connections.
1.3.3 Instrumentation Amplifier
The MCP6N16 is a zero-drift instrumentation amplifier designed for single-supply
operation with rail-to-rail input (no common mode crossover distortion) and output
performance. The device can be operated over a supply range of +1.8V to +5.5V
(V
DUT
). The evaluation board is populated with the MCP6N16-100, which is designed
to be operated with a gain of +100V/V and higher. At a gain of +100V/V, the
MCP6N16-100 offers a typical input signal range of 34 mV
P-P
, with a maximum offset
voltage of only 17 µV. It offers a very low noise of 0.93 µV
P-P
(0.1 to 10 Hz), and a
voltage noise density of 45 nV/ √ Hz.
The RC input filter provides a low-pass function for both common mode (CM) and
differential mode (DM) signals. They are fast enough to follow supply variations and to
let the MCP6N16 reject CM mains noise (e.g., harmonics of 50 or 60 Hz). In its default
setting, it is set to a gain of +101V/V; using jumper J9, it can be reconfigured for gain
of +301V/V. The output filter provides a low-pass function for both CM and DM signals.
It is slow in order to minimize noise and interference.
1.3.4 V
REF
The evaluation board uses the precision voltage reference IC MCP1525 to provide a
+2.5V reference voltage (V
REF
) with an accuracy of better than 1%. This voltage can
be adjusted and used as an external reference voltage for the MCP6N16 to level shift
its output voltage to a desired level.
1.3.5 Power Supply Connector
The evaluation board allows for a number of supply configurations using connector J2.
In its default configuration, the board can be operated with just one external lab supply
voltage (Jumper J1 is installed and connects the V
DUT
and VS+ lines together).
Shown in Figure 1-2 and Figure 1-3 are the 3D views of the evaluation board’s top and
bottom side. The evaluation board measures approximately 4.3'' x 2.4''
(10.9 cm x 6.1 cm).
FIGURE 1-2: MCP6N16 Evaluation Board – Top View.