MCP606 Microchip Technology, MCP606 Datasheet - Page 10

• Manufacturer Part Number: MCP606
• Description: 2.5V to 5.5V Micropower CMOS Op Amps
• Manufacturer: Microchip Technology

MCP606/607/608/609
3.0
The MCP606/607/608/609 family of operational ampli-
fiers are fabricated on Microchip’s state-of-the-art
CMOS process. They are unity gain stable and suitable
for a wide range of general purpose applications. With
this family of operational amplifiers, the power supply
pin should be by-passed with a 0.1 F capacitor.
3.1
There are two specifications that describe the output
swing capability of the MCP606/607/608/609 family of
operational amplifiers. The first specification, Low
Level and High Level Output Voltage Swing, defines
the absolute maximum swing that can be achieved
under specified loaded conditions. For instance, the
Low Level Output Voltage Swing of the MCP606/607/
608/609 family is specified to be able to swing at least
to 15mV from the negative rail with a 25k load to V
2.
This output swing performance is shown in Figure 3-1,
where the output of an MCP606 is configured in a gain
of +2V/V and overdriven with a 4kHz triangle wave. In
this figure, the degradation of the output swing linearity
is clearly illustrated. This degradation occurs after the
point at which the open loop gain of the amplifier is
specified and before the amplifier reaches its maximum
and minimum output swing.
FIGURE 3-1:
Swing
The second specification that describes the output
swing capability of these amplifiers is the Linear Region
Maximum Output Voltage Swing. This specification
defines the maximum output swing that can be
achieved while the amplifier is still operating in its linear
region.
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APPLICATIONS INFORMATION
Rail-to-Rail Output Swing
100
V
SS
V
DD
200
Low Level and High Level Output
V
V
OL
OH
300
Time (uS)
V
SS
V
400
DD
500
600
V
V
DD
SS
700
5
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
4.1
4
DD
/
The Linear Region Maximum Output Voltage Swing of
the MCP606/607/608/609 family is specified within
50mV from the positive and negative rail with a 25k
load and 100mV from the rails with a 5k
overriding condition that defines the linear region of the
amplifier is the open loop gain that is specified over that
region. In the voltage output region between V
50mV and V
to 105dB (min) with a 25k load.
The classical definition of the DC open loop gain of an
amplifier is:
where:
3.2
Since the MCP606/607/608/609 amplifier family is
designed with CMOS devices, it does not exhibit phase
inversion when the input pins exceed the negative sup-
ply voltage. Figure 3-2 shows an input voltage exceed-
ing both supplies with no resulting phase inversion.
FIGURE 3-2:
op amps do not have phase reversal issues. For this
graph, the amplifier is in a gain of +2V/V.
A
for R
changing output voltage of the amplifier.
OL
V
V
OUT
OS
is the DC open loop gain of the amplifier,
Input Voltage and Phase Reversal
L
= 25k , and
is the change in offset voltage with the
A
is equal to (V
DD
OL
- 50mV, the open loop gain is specified
= 20 log
The MCP606/607/608/609 family of
10
DD
2000 Microchip Technology Inc.
- 50mV) - (V
VOUT / VOS)
SS
+ 50mV)
load. The
SS
+