MCP6C04 datasheet(13/54 Pages) MICROCHIP

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 2019 Microchip Technology Inc.

DS20006179A-page 13

MCP6C04

FIGURE 1-8:

VOUT Power On/Off Timing

Diagram, High-Side.

1.5

Simplified Test Circuits

1.5.1

VOS TEST CIRCUIT

Figure 1-9 tests the MCP6C04’s input offset errors

(VOS, 1/CMRR, 1/CMRR2 and 1/PSRR, etc.). RWIP is

set very low, so IBP does not affect the result. VOUT is

filtered and amplified before measuring the result.

FIGURE 1-9:

Input Offset Test Circuit for

the MCP6C04.

When MCP6C04 is in its normal range of operation, the

DC output voltages are (VE is the sum of input offset

errors and gE is the gain error):

EQUATION 1-1:

The resistances at the Device Under Test (DUT) need

to be small enough for accuracy (see Figure 1-10).

These resistances include wires, traces, vias, etc.

EQUATION 1-2:

1.5.2

DC DIFFERENTIAL GAIN TEST

CIRCUIT

Figure 1-10 is used for testing the differential gain error,

nonlinearity and input voltage range (gE, INLDM, VDML

and VDMH). We compare VMEAS with the ideal VOUT,

then extract the above parameters.

FIGURE 1-10:

Differential Gain Test

Circuit.

When measuring the differential input range, all of the

voltages must be in range except VDM.

When measuring differential errors (gE, ΔgE/ΔTA and

INLDM), all voltages are held constant, except VDM.

For accuracy, the wiring resistances at the DUT need

to be very small (see Equation 1-2).

1.5.3

AC GAINS TEST CIRCUIT

Figure 1-11 is used for testing the INA’s different AC

gains. The AC voltages are:

•vout is the AC output

•vip is the AC Common-mode input, used for

CMRR plots

•vdm is the AC differential input, used for GDM plots

(also for CMRR and PSRR)

•vdd and vss are the AC supply inputs, used for

PSRR plots (including PSRR+ and PSRR-)

FIGURE 1-11:

AC Gain Test Circuit.

VPHH +0.1V

High-Z

VOUT

VIP

tPHOFF

tPHON

VPHL +0.1V

VDD

U1 (DUT)

MCP6C04

RWIP

RWIM

RWR

VMEAS

VSS

VOUT

LPF

and

Gain

VIP

GDM =

VOUT

GDM 1 gE

()VE VREF

VMEAS

GPAVOUT

DM Gain

RWIP ≤ 4mΩ

RWIM ≤ 0.1Ω

RWR ≤ 1Ω

VDD U

1 (DUT)

MCP6C04

RWR

VSS

RWIP

RWIM

VMEAS

VOUT

LPF

VIM

VIP

VDD +vdd

U1 (DUT)

MCP6C04

RWR

VSS +vss

VOUT +vout

VDM +vdm

VIP +vip

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