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| 型號： | MCP4441-503E/ST |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 96/100頁 |
| 文件大小： | 0K |
| 描述： | IC DGTL POT 129TAPS QUAD 20TSSOP |
| 標準包裝： | 74 |
| 接片： | 129 |
| 電阻（歐姆）： | 50k |
| 電路數(shù)： | 4 |
| 溫度系數(shù)： | 標準值 150 ppm/°C |
| 存儲器類型： | 非易失 |
| 接口： | I²C（設備位址） |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | 20-TSSOP |
| 包裝： | 管件 |
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2010 Microchip Technology Inc.
DS22265A-page 95
MCP444X/446X
B.2
Optimizing Circuit Design for
Low-Voltage Characteristics
The low-voltage nonlinear characteristics can be
minimized by application design. The section will show
two application circuits that can be used to control a
programmable reference voltage (VOUT).
Minimizing the low-voltage nonlinear characteristics is
done by keeping the voltages on the wiper switch
nodes at a voltage where either the NMOS or PMOS
transistor is turned on.
An example of this is if we are using a digital
potentiometer for a voltage reference (VOUT). Let’s say
that we want VOUT to range from 0.5 * VDD to 0.6 * VDD.
In example implementation #1 (Figure B-15), we
window the digital potentiometer using resistors R1 and
R2. When the wiper code is at full scale, the VOUT
voltage will be
≥ 0.6 * VDD, and when the wiper code is
at zero scale the VOUT voltage will be ≤ 0.5 * VDD.
Remember that the digital potentiometers RAB variation
must be included. Table B-1 shows that the VOUT
voltage can be selected to be between 0.455 * VDD and
0.727 * VDD, which includes the desired range. With
respect to the voltages on the resistor network node, at
1.8V the VA voltage would range from 1.29V to 1.31V
while the VB voltage would range from 0.82V to 0.86V.
These voltages cause the wiper resistance to be in the
nonlinear region (see Figure B-12). In Potentiometer
mode, the variation of the wiper resistance is typically
not an issue, as shown by the INL/DNL graph
(Figure 2-7).
In example implementation #2 (Figure B-16) we use
the digital potentiometer in Rheostat mode. The
resistor ladder uses resistors R1 and R2 with RBW at
the bottom of the ladder. When the wiper code is at full
scale, the VOUT voltage will be ≥ 0.6 * VDD and when
the wiper code is at full scale the VOUT voltage will be
≤ 0.5 * VDD. Remember that the digital potentiometers
the VOUT voltage can be selected to be between 0.50 *
VDD and 0.687 * VDD, which includes the desired
range. With respect to the voltages on the resistor
network node, at 1.8V the VW voltage would range from
0.29V to 0.38V. These voltages cause the wiper
resistance to be in the linear region (see Figure B-12).
FIGURE B-15:
Example Implementation #1.
TABLE B-1:
EXAMPLE #1 VOLTAGE
CALCULATIONS
Variation
Min
Typ
Max
R1
12,000
R2
20,000
RAB
8,000
10,000
12,000
VOUT (@ FS) 0.714 VDD
0.70 VDD
0.727 VDD
VOUT (@ ZS) 0.476 VDD
0.50 VDD
0.455 VDD
VA
0.714 VDD
0.70 VDD
0.727 VDD
VB
0.476 VDD
0.50 VDD
0.455 VDD
Legend:
FS – Full Scale, ZS – Zero Scale
A
B
W
VW
VA
VB
R1
R2
VOUT
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