參數(shù)資料
型號(hào)： MCP42100
廠商： Microchip Technology Inc.
元件分類： 數(shù)字電位計(jì)
英文描述： Single/Dual Digital Potentiometer with SPI⑩ Interface
中文描述： 單/雙數(shù)字電位器接口與SPI⑩
文件頁數(shù)： 15/33頁
文件大?。?/td> 682K
代理商： MCP42100
2003 Microchip Technology Inc.
DS11195C-page 15
MCP41XXX/42XXX
4.2
Typical Applications
4.2.1
PROGRAMMABLE SINGLE-ENDED
AMPLIFIERS
Potentiometers are often used to adjust system refer-
ence levels or gain. Programmable gain circuits using
digital potentiometers can be realized in a number of
different ways. An example of a single-supply, inverting
gain amplifier is shown in Figure 4-4. Due to the high
input impedance of the amplifier, the wiper resistance
is not included in the transfer function. For a single-sup-
ply, non-inverting gain configuration, the circuit in
Figure 4-5 can be used.
.
FIGURE 4-4:
programmable, inverting gain amplifier using a
digital potentiometer.
Single-supply,
FIGURE 4-5:
programmable, non-inverting gain amplifier.
Single-supply,
In order for these circuits to work properly, care must be
taken in a few areas. For linear operation, the analog
input and output signals must be in the range of V
SS
to
V
DD
for the potentiometer and input and output rails of
the op-amp. The circuit in Figure 4-4 requires a virtual
ground or reference input to the non-inverting input of
the amplifier. Refer to Application Note 682,
“Using
Single-Supply Operational Amplifiers in Embedded
Systems” (DS00682),
for more details. At power-up or
reset (RS), the resistance is set to mid-scale, with R
A
and R
B
matching. Based on the transfer function for the
circuit, the gain is -1 V/V. As the code is increased and
the wiper moves towards the A terminal, the gain
increases. Conversely, when the wiper is moved
towards the B terminal, the gain decreases. Figure 4-6
shows this relationship. Notice the pseudo-logarithmic
gain around decimal code 128. As the wiper
approaches either terminal, the step size in the gain
calculation increases dramatically. Due to the
mismatched ratio of R
A
and R
B
at the extreme high and
low codes, small increments in wiper position can
dramatically affect the gain. As shown in Figure 4-3,
recommended gains lie between 0.1 and 10 V/V.
FIGURE 4-6:
and differential amplifier circuits.
Gain vs. Code for inverting
4.2.2
PROGRAMMABLE DIFFERENTIAL
AMPLIFIER
An example of a differential input amplifier using digital
potentiometers is shown in Figure 4-7. For the transfer
function to hold, both pots must be programmed to the
same code. The resistor-matching from channel-to-
channel within a dual device can be used as an advan-
tage in this circuit. This circuit will also show stable
operation over temperature due to the low potentiome-
ter temperature coefficient. Figure 4-6 also shows the
relationship between gain and code for this circuit. As
the wiper approaches either terminal, the step size in
the gain calculation increases dramatically. This circuit
is recommended for gains between 0.1 and 10 V/V.
MCP606
V
IN
V
SS
-IN
+IN
V
OUT
B
A
W
MCP41010
Where:
V
REF
+
-
V
DD
V
OUT
V
IN
R
B
R
A
-------
V
REF
1
R
B
R
A
-------
+
+
–
=
R
A
R
256
(
--------------------------------------
D
–
)
256
=
R
B
R
D
n
256
------------------
=
R
AB
D
n
Total Resistance of pot
=
Wiper setting forD
n
0 to 255
=
=
MCP606
V
IN
V
SS
V
DD
+IN
-IN
V
OUT
RB
RA
W
MCP41010
+
-
Where:
R
A
R
256
(
--------------------------------------
D
n
–
)
256
=
R
B
R
D
n
256
------------------
=
R
AB
D
n
Total Resistance of pot
=
Wiper setting forD
n
0 to 255
=
=
V
OUT
V
IN
1
R
B
R
A
-------
+
=
0.1
1
10
0
64
128
192
256
Decimal code (0-255)
A
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCP42100-E/P 功能描述:數(shù)字電位計(jì) IC 256 Step SPI 100kOhm RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel
MCP42100-E/SL 功能描述:數(shù)字電位計(jì) IC 256 Step SPI 100kOhm RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel
MCP42100-E/ST 功能描述:數(shù)字電位計(jì) IC 256 Step SPI 100kOhm RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel
MCP42100-I/P 功能描述:數(shù)字電位計(jì) IC 256 Step SPI 100kOhm RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel
MCP42100-I/P 制造商:Microchip Technology Inc 功能描述:Digital Potentiometer (Pots) IC
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