MCP6284-E/SN Microchip Technology, MCP6284-E/SN Datasheet - Page 10

• Manufacturer Part Number: MCP6284-E/SN
• Description: 450 uA, 5 MHz Rail-to-Rail Op Amp
• Manufacturer: Microchip Technology

MCP6281/2/3/4/5
3.0
The MCP6281/2/3/4/5 family of op amps is manufac-
tured using Microchip's state of the art CMOS process.
This family is specifically designed for low-cost, low-
power and general-purpose applications. The low sup-
ply voltage, low quiescent current and wide bandwidth
makes the MCP6281/2/3/4/5 ideal for battery-powered
applications.
3.1
The MCP6281/2/3/4/5 op amp is 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 MCP6281/2/3/4/5 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
sured at V
ensure proper operation.
Input voltages that exceed the input voltage range
(V
sive 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.
DS21811C-page 10
SS
– 0.3V to V
-1
6
5
4
3
2
1
0
APPLICATION INFORMATION
Rail-to-Rail Input
-15
CM
-14
= V
DD
SS
CM
-13
SS
CM
. The Input Offset Voltage is mea-
+ 0.3V at 25°C) can cause exces-
up to 300 mV above V
– 300 mV and V
-12
V
. With this topology, the device
IN
The MCP6281/2/3/4/5 Show
Time (1 ms/div)
-11
-10
V
OUT
-9
CM
-8
), while the other
DD
-7
+ 300 mV to
V
G = +2 V/V
DD
= 5.0V
-6
DD
-5
and
FIGURE 3-2:
Resistor (R
3.2
The output voltage range of the MCP6281/2/3/4/5 op
amp is V
when R
V
3.3
The MCP6283 and MCP6285 are single and dual op
amps with chip select (CS), respectively. When CS is
pulled high, the supply current drops to 0.7 µA (typ) and
flows through the CS pin to V
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 MCP6283 and MCP6285.
CS
V
I
I
DD
VSS
CS
OUT
V
= 5.5V. Refer to Figure 2-16 for more information.
IN
-0.7 µA, typ.
0.7 µA, typ.
R IN
R IN
Rail-to-Rail Output
MCP6283/5 Chip Select (CS)
L
DD
Hi-Z
= 10 k
IN
– 15 mV (min.) and V
).
--------------------------------------------------------------------------------- -
R
V SS
----------------------------------------------------------------------------- -
Maximum expected V IN
IN
V
–
t
IL
on
is connected to V
Minimum expected V IN
Input Current Limiting
Timing Diagram for the Chip
 2004 Microchip Technology Inc.
–
+
MCP6281
10 nA, typ.
-450 µA, typ.
2 mA
2 mA
SS
. When this happens,
SS
+ 15 mV (max.)
–
V
-0.7 µA, typ.
0.7 µA, typ.
V DD
IH
t
off
DD
V
/2 and
Hi-Z
OUT