MCP6291 N/A, MCP6291 Datasheet - Page 11

• Manufacturer Part Number: MCP6291
• Description: MCP6291-2-3-4
• Manufacturer: N/A

3.0
The MCP6291/2/3/4 family of op amps is manufactured
using Microchip’s state-of-the-art CMOS process,
specifically designed for low cost, low power and
general-purpose applications. The low supply voltage,
low quiescent current and wide bandwidth makes the
MCP6291/2/3/4 ideal for battery-powered applications.
3.1
The MCP6291/2/3/4 op amps are designed to prevent
phase reversal when the input pins exceed the supply
voltages. Figure 3-1 shows the input voltage exceeding
the supply voltage without any phase reversal.
FIGURE 3-1:
No Phase Reversal.
The input stage of the MCP6291/2/3/4 op amp uses
two differential input stages in parallel. One operates at
low common mode input voltage (V
operates at high V
operates with V
300 mV below V
measured at V
to ensure proper operation.
Input voltages that exceed the input voltage range
(V
excessive current to flow into or out of the input pins.
Current beyond ±2 mA can cause reliability problems.
Applications that exceed this rating must be externally
limited with a resistor, as shown in Figure 3-2.
2003 Microchip Technology Inc.
SS
- 0.3V to V
-1
6
5
4
3
2
1
0
-15
APPLICATION INFORMATION
Rail-to-Rail Input
-14
CM
-13
CM
SS
= V
CM
DD
V
-12
. The Input Offset Voltage is
up to 300 mV above V
IN
. With this topology, the device
SS
The MCP6291/2/3/4 Show
Time (1 ms/div)
+ 0.3V at 25°C) can cause
-11
- 300 mV and V
-10
V
OUT
-9
CM
-8
), while the other
V
G = +2V/V
-7
DD
DD
= 5.0V
+ 300 mV
-6
DD
-5
and
FIGURE 3-2:
Resistor (R
3.2
The output voltage range of the MCP6291/2/3/4 op amp
is V
R
Refer to Figure 2-17 for more information.
3.3
The MCP6293 is a single amplifier with Chip Select
(CS). When CS is pulled high, the supply current drops
to 0.7 µA (typ) and flows through the CS pin to V
When this happens, the amplifier output is put into a
high-impedance state. By pulling CS low, the amplifier
is enabled. If the CS pin is left floating, the amplifier
may not operate properly. Figure 3-3 shows the output
voltage and supply current response to a CS pulse.
FIGURE 3-3:
Select (CS) pin on the MCP6293.
V
L
I
OUT
VSS
CS
I
= 10 k
CS
DD
V
IN
-0.7 µA, typ.
- 15 mV (min.) and V
0.7 µA, typ.
R
R
Rail-to-Rail Output
MCP6293 Chip Select (CS)
IN
IN
Hi-Z
Š
Š
is connected to V
IN
------------------------------------------------------------------------------------ -
V
---------------------------------------------------------------------------------- -
).
Maximum expected V
R
MCP6291/2/3/4
SS
IN
V
–
t
IL
on
Minimum expected V
Input Current Limiting
Timing Diagram for the Chip
–
+
MCP6291
10 nA, typ
-1.0 mA, typ.
2 mA
2 mA
SS
DD
+ 15 mV (max.) when
/2 and V
DS21812B-page 11
IN
V
–
IH
-0.7 µA, typ.
V
0.7 µA, typ.
t
IN
off
DD
DD
V
Hi-Z
OUT
= 5.5V.
SS
.