MCP651EV-VOS Microchip Technology, MCP651EV-VOS Datasheet - Page 10

• 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

1.3
1.4
DS51834A-page 6
INTENDED USE
DESCRIPTION
The MCP651 Input Offset Evaluation Board is intended to provide a simple means to
measure the MCP651 Input Offset Evaluation Board op amp’s input offset voltage
under a variety of operating conditions. The measured input offset voltage (V
includes the input offset voltage specified in the data sheet (V
power supply voltage (PSRR), common mode voltage (CMRR), output voltage (A
input offset voltage drift over temperature (ΔV
The MCP651 Input Offset Evaluation Board works most effectively at room tempera-
ture (near 25°C). Measurements at other temperatures should be done in an oven
where the air velocity is minimal.
This section starts with the conversion of DUT bias voltages described in the MCP651
data sheet to the voltages on this board. Then there is a discussion of the circuitry that
controls the DUT’s output voltage (V
(V
details of this board are given in Appendix A. “Schematics and Layouts” and
Appendix B. “Bill Of Materials (BOM)”.
1.4.1
The MCP651 data sheet describes all of its bias voltages relative to V
assumed to be at ground (0V). On the other hand, the MCP651 Input Offset Evaluation
Board sets the DUT’s input common mode voltage to 0V. The user needs to convert
from the first set of voltages to the second set (by subtracting V
TABLE 1-1:
The supply voltages V
quiescent current (I
EQUATION 1-1:
Data Sheet Bias Voltage
OST
). Finally, other portions of the circuit, and their purpose, are discussed. Complete
Conversion of Bias Voltages
V
V
V
V
V
(V)
OUT
V
CAL
CM
DD
SS
L
CONVERSION OF BIAS VOLTAGES
Q
= 6 mA):
DDX
V
V
DDX
SSX
and V
Conversion Equations
=
=
V
V
SSX
SSI
DDI
V
V
V
V
V
V
OUT
CAL
CM
DD
–
SS
OUTX
L
can be estimated using the MCP651’s typical
+
I
– V
Q
– V
– V
– V
– V
I
– V
(
Q
10
CM
(
) and amplifies its total input offset voltage
CM
CM
CM
10
CM
CM
Ω
)
Ω
≈
OS
)
V
≈
/ΔT
SSI
V
DDI
–
A
) and 1/f noise.
60 mV
+
Evaluation Board Bias Voltage
60 mV
© 2009 Microchip Technology Inc.
OS
) plus changes due to:
CM
V
CMX
V
V
):
V
V
V
OUTX
CALX
(V)
DDI
SSI
LX
= 0V
SS
, which is
OST
)
OL
),