MCP6C04 datasheet(39/54 Pages) MICROCHIP

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 2019 Microchip Technology Inc.

DS20006179A-page 39

MCP6C04

FIGURE 5-7:

SNR vs. Bandwidth

Estimates, VDD =2.0V.

FIGURE 5-8:

SNR vs. Bandwidth

Estimates, VDD =5.5V.

5.1.9

UNIDIRECTIONAL APPLICATIONS

In unidirectional applications where VREF =VSS, it is

important to minimize output headroom (VOL). The

lower VOL is, the more accurate the zero scale reading

is.

To reduce VOL, make IOUT as low as possible. This is

done by making RL high and by tying VL to VSS.

Figure 5-2 shows how to connect VREF and VSS for

best performance.

5.1.10

BIDIRECTIONAL APPLICATIONS

Figure 5-3 shows ways to connect VREF and VSS for

best performance.

To maximize headroom, reduce VOL and VOH by

setting RL high.

5.1.11

SUPPLY PINS

As described in Section 3.5 “Low-Side Power

Supplies (VDD, VSS)”, the ground potential (GND)

can be set where needed in your design. The most

common design approach has VSS = GND (positive

single supply). Other common design approaches

have

VDD = GND (negative single supply) or

VSS <GND <VDD (dual, or split, supplies).

Setting VSS = GND has the potential to increase

rejection of crosstalk and glitches. In any case, a good

ground design (e.g., ground plane on a PCB) and

appropriate bypass capacitors are needed to realize

these benefits. It pays to be sure that your capacitor's

voltage rating and dielectric will support your needs

over your voltage and temperature ranges. With some

dielectrics, it pays to also take aging (changes over

time) into account too.

100

110

120

130

1.E+0

1.E+1

1.E+2

1.E+3

1.E+4

1.E+5

Bandwidth; f (Hz)

DM = 20

DM = 50

DM = 100

DD = 2.0V

Dashed Lines = SVosR

Solid Lines = SNR

100

10k

100k

100

110

120

130

1.E+0

1.E+1

1.E+2

1.E+3

1.E+4

1.E+5

Bandwidth; f (Hz)

DM = 20

DM = 50

DM = 100

DD = 5.5V

Dashed Lines = SVosR

Solid Lines = SNR

100

10k

100k

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