• 參數(shù)資料
      型號(hào)： MCP41050T
      廠商： Microchip Technology Inc.
      元件分類： FPGA
      英文描述： 400000 SYSTEM GATE 2.5 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN
      中文描述： 單/雙數(shù)字電位器接口與SPI⑩
      文件頁(yè)數(shù)： 15/33頁(yè)
      文件大?。?/td> 682K
      代理商： MCP41050T
      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
      相關(guān)PDF資料
      PDF描述
      MCP41100 Single/Dual Digital Potentiometer with SPI⑩ Interface
      MCP41100T Single/Dual Digital Potentiometer with SPI⑩ Interface
      MCP41XXX 400000 SYSTEM GATE 2.5 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN
      MCP42010 Single/Dual Digital Potentiometer with SPI Interface(單/雙數(shù)字電位器，帶SPI接口)
      MCP42050 Single/Dual Digital Potentiometer with SPI Interface(單/雙數(shù)字電位器，帶SPI接口)
      相關(guān)代理商/技術(shù)參數(shù)
      參數(shù)描述
      MCP41050TE/P 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Single/Dual Digital Potentiometer with SPI Interface
      MCP41050TE/SL 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Single/Dual Digital Potentiometer with SPI Interface
      MCP41050TE/SN 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Single/Dual Digital Potentiometer with SPI Interface
      MCP41050T-E/SN 功能描述:數(shù)字電位計(jì) IC 256 Step SPI 50kOhm 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
      MCP41050TE/ST 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Single/Dual Digital Potentiometer with SPI Interface
      發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

      采購(gòu)需求

      (若只采購(gòu)一條型號(hào)，填寫一行即可)

      發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

      發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

      *型號(hào) *數(shù)量 廠商 批號(hào) 封裝
      添加更多采購(gòu)

      我的聯(lián)系方式

      *
      *
      *