MCP6V89-ESLASHST datasheet(25/52 Pages) MICROCHIP

Part #	MCP6V89-E/ST

Description	5 MHz, 0.5 mA, Zero-Drift Op Amps

PDF	52 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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25 / 52 page

 2020 Microchip Technology Inc.

DS20006398A-page 25

MCP6V86/6U/7/9

4.4.3

OFFSET VOLTAGE CORRECTION

Figure 4-13 shows MCP6V86 (U2) correcting the input

offset voltage of another op amp (U1). R2 and C2 inte-

grate the offset error seen at U1’s input. The integration

needs to be slow enough to be stable (with the feed-

back provided by R1 and R3). R4 and R5 attenuate the

integrator’s output. This shifts the integrator pole down

in frequency.

FIGURE 4-13:

Offset Correction.

4.4.4

PRECISION COMPARATOR

Use high gain before a comparator to improve the

latter’s performance. Do not use the MCP6V86/6U/7/9

as a comparator by itself; the VOS correction circuitry

does not operate properly without a feedback loop.

FIGURE 4-14:

Precision Comparator.

MCP6XXX

VDD/2

VIN

VOUT

VDD/2

MCP6V86

–

VIN

VDD/2

VOUT

MCP6V86

MCP6541

–

MCP6V89-E/ST Datasheet(PDF) 25 Page - Microchip Technology