MCP4021 datasheet(42/64 Pages) MICROCHIP

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MCP4021/2/3/4

DS21945E-page 42

6.0

RESISTOR

Digital potentiometer applications can be divided into

two categories:

• Rheostat configuration

• Potentiometer (or voltage divider) configuration

Figure 6-1 shows a block diagram for the MCP402X

resistors.

FIGURE 6-1:

Resistor Block Diagram.

Step resistance (RS) is the resistance from one tap

setting to the next. This value will be dependent on the

RAB value that has been selected. Table 6-1 shows the

typical step resistances for each device.

The total resistance of the device has minimal variation

due to operating voltage (see Figure 2-6, Figure 2-17,

Figure 2-27 or Figure 2-37).

TABLE 6-1:

TYPICAL STEP RESISTANCES

Terminal A and B, as well as the wiper W, do not have

a polarity. These terminals can support both positive

and negative current.

N = 63

N = 62

N = 61

N = 1

N = 0

RW (1)

01h

Analog

Mux

RW (1)

00h

RW (1)

3Dh

RW (1)

3Eh

RW (1)

3Fh

Note 1: The wiper resistance is tap dependent.

That is, each tap selection resistance

has a small variation. This variation

effects the smaller resistance devices

(2.1 k

Ω) more.

Part Number

Typical Resistance (

Ω)

Total (RAB)

Step (RS)

MCP402X-203E

2100

33.33

MCP402X-503E

5000

79.37

MCP402X-104E

10000

158.73

MCP402X-504E

50000

793.65

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