MCP6G01-ESLASHMS datasheet(24/38 Pages) MICROCHIP

24 / 38 page

MCP6G01/1R/1U/2/3/4

DS22004B-page 24

4.8.4

SHIFTED GAIN RANGE SGA

Figure 4-12 shows a circuit using a MCP6271 at a gain

of +10 in front of a MCP6G01. This shifts the overall

gain range to +10 V/V to +500 V/V (from +1 V/V to

+50 V/V).

FIGURE 4-12:

SGA with Higher Gain

Range.

It is also easy to shift the gain range to lower gains (see

Figure 4-13). The MCP6001 acts as a unity gain buffer,

and the resistive voltage divider shifts the gain range

down to +0.1 V/V to +5.0 V/V (from +1 V/V to +50 V/V).

FIGURE 4-13:

SGA with Lower Gain

Range.

4.8.5

ADC DRIVER

This family of SGAs is well suited for driving Analog-to-

Digital Converters (ADC). The gains (1, 10, and 50)

effectively increase the ADC’s input resolution by a

factor of as large as 50 (i.e., by 5.6 bits). This works

well for applications needing relative accuracy more

than absolute accuracy (e.g., power monitoring); see

Figure 4-14.

FIGURE 4-14:

SGA as an ADC Driver.

The low-pass filter in the block diagram reduces the

integrated noise at the MCP6G01’s output and serves

as an anti-aliasing filter. This filter may be designed

using Microchip’s FilterLab® software, available at

www.microchip.com.

VIN

VOUT

MCP6271

MCP6G01

1.11 k

10.0 k

VIN

MCP6001

1.11 k

10.0 k

VOUT

MCP6G01

OUT

MCP3001

10-bit

ADC

MCP6G01

VIN

Low-pass

Filter

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