MCP6L71 Datasheet, PDF (5/32 Pages) Microchip Technology – 2 MHz, 150 μA Op Amps

1.3 Test Circuits
The circuit used for most DC and AC tests is shown in
Figure 1-1. This circuit can independently set V_CM and
V_OUT; see Equation 1-1. Note that V_CM is not the
circuit’s common mode voltage ((V_P + V_M)/2), and that
V_OST includes V_OS plus the effects (on the input offset
error, V_OST) of temperature, CMRR, PSRR and A_OL.
EQUATION 1-1:
G_DM = R_F ⁄ R_G
V_CM = (V_P + V_DD ⁄ 2) ⁄ 2
V_OST = V_IN– – V_IN+
V_OUT = (V_DD ⁄ 2) + (V_P – V_M) + V_OST(1 + G_DM)
Where:
G_DM = Differential Mode Gain
V_CM = Op Amp’s Common Mode
Input Voltage
V_OST = Op Amp’s Total Input Offset
Voltage
(V/V)
(V)
(mV)
MCP6L71/1R/2/4
C_F
6.8 pF
R_G
100 kΩ
V_P
V_IN+
R_F
100 kΩ
MCP6L7X
V_IN–
V_M
R_G
100 kΩ
R_F
100 kΩ
V_DD
V_DD/2
C_B1
100 nF
C_B2
1 µF
R_L
10 kΩ
V_OUT
C_L
60 pF
C_F
6.8 pF
V_L
FIGURE 1-1:
AC and DC Test Circuit for
Most Specifications.
© 2009 Microchip Technology Inc.
DS22145A-page 5