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MCP4021 датащи(PDF) 42 Page - Microchip Technology

номер детали MCP4021
подробное описание детали  Low-Cost NV Digital POT with WiperLock??Technology
PDF  64 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP4021 датащи(HTML) 42 Page - Microchip Technology

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MCP4021/2/3/4
DS21945E-page 42
© 2006 Microchip Technology Inc.
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.
RS
A
RS
RS
RS
B
N = 63
N = 62
N = 61
N = 1
N = 0
RW (1)
W
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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