MCP651EV-VOS Microchip Technology, MCP651EV-VOS Datasheet - Page 13

• Manufacturer Part Number: MCP651EV-VOS
• Description: BOARD EVAL OP AMP MCP651
• Manufacturer: Microchip Technology
• Series: mCal Technologyr

Specifications of MCP651EV-VOS

• Channels Per Ic: 1 - Single
• Amplifier Type: General Purpose
• Output Type: Single-Ended, Rail-to-Rail
• Slew Rate: 30 V/µs
• Current - Output / Channel: 100mA
• Operating Temperature: -40°C ~ 125°C
• Current - Supply (main Ic): 6mA
• Voltage - Supply, Single/dual (±): 2.5 V ~ 5.5 V
• Board Type: Fully Populated
• Utilized Ic / Part: MCP651
• Processor To Be Evaluated: MCP651
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 2.5 V to 5.5 V
• Tool Type: Evaluation Board
• Core Architecture: PIC
• Cpu Core: PIC
• Data Bus Width: 8 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

© 2009 Microchip Technology Inc.
1.4.3
Figure 1-3 shows the basic DUT biasing circuitry, except the input pins which have
already been discussed (V
FIGURE 1-3:
Lab power supplies are connected to V
R
op amps on the board. Since the MCP651’s quiescent current is between 3 mA and
9 mA, the actual power supply voltages (V
90 mV. I
EQUATION 1-3:
The DUT’s V
when it is in calibration mode. Thus, the DUT’s offset (V
this board) is equal to V
The RCAL potentiometer (POT or R43), with the resistors R
The values chosen allow the POT to cover the specified V
Connecting a voltmeter to V
that it is also possible to drive V
be, but doesn’t have to be, at mid-range).
V
control loop. If V
railed at the corresponding supply voltage.
The load resistor (R
usually set to mid-supply. The V
loading on V
OUTX
38
, along with the capacitors C
is set, as previously explained, to be equal to V
DD
V
DUT Bias Voltage Inputs
V
V
and I
CALX
DDX
OUTX
SSX
CAL
COX
SS
pin sets its internal common mode voltage (V
(about 40 kΩ).
4.49Ω
4.49Ω
2.2 kΩ
can be calculated as (I
L
10 kΩ
R
R
DUT Bias Circuitry.
150Ω
is at or beyond V
or R
37
38
R
R
R
44
43
42
CALX
10
CMX
CALX
) is biased to the externally supplied voltage V
.
CALX
= 0V).
13
C
10 µF
C
10 µF
LX
, C
makes it possible to set the POT accurately. Notice
21
22
4.49Ω
4.49Ω
I
DD
C
100 nF
connection can be left open, which minimizes the
R
R
I
SS
14
29
25
30
with an external voltage source (the wiper should
=
SSI
, C
=
DDX
V
-------------------------------- -
V
----------------------------
21
or V
DDX
C
100 nF
C
100 nF
SSX
DDI
SS
and V
13
14
and C
10
10
DUT
V
is negative):
–
DDI
–
and V
Ω
CAL
Ω
V
V
V
V
SSI
DDI
, then the loop forces V
DD
SS
SSX
22
V
OUT
, minimize crosstalk from the other
I
I
SSI
DD
U
SS
. The resistors R
V
V
1
DDI
SSI
COX
OS
) are different by 30 mV to
CALX
) is small when V
by the integrator in the PI
42
R
1.00 kΩ
10
range, and a little more.
CMX
and R
of the MCP651)
43
29
V
V
, sets V
OUTX
LX
DS51834A-page 9
, R
OUTX
30
LX
CMX
, R
. V
to be
CALX
(0V on
37
LX
and
is
.