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    參數(shù)資料
    

    


    


    
型號(hào)：
MCP4461-503E/ST

    

    
廠商：
Microchip Technology

    

    
文件頁數(shù)：
45/100頁

    

    
文件大小：
0K

    

    
描述：
IC POT 8B QUAD NONV 50K 20TSSOP

    

    
標(biāo)準(zhǔn)包裝：
74

    

    
接片：
257
    		

    

    
電阻（歐姆）：
50k
    		

    

    
電路數(shù)：
4
    		

    

    
溫度系數(shù)：
標(biāo)準(zhǔn)值 150 ppm/°C
    		

    

    
存儲(chǔ)器類型：
非易失
    		

    

    
接口：
I²C（設(shè)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(yīng)商設(shè)備封裝：
20-TSSOP
    		

    

    
包裝：
管件
    		

    

    

    

	
    
    
    

    
    
	
     2010 Microchip Technology Inc.
    DS22265A-page 49
    MCP444X/446X
    5.0
    RESISTOR NETWORK
    The Resistor Network has either 7-bit or 8-bit
    resolution. Each Resistor Network allows zero scale to
    full scale connections. Figure 5-1 shows a block
    diagram for the resistive network of a device.
    The Resistor Network is made up of several parts.
    These include:
     Resistor Ladder
    Wiper
     Shutdown (Terminal Connections)
    Devices have four resistor networks. These are
    referred to as Pot 0, Pot 1 Pot 2, and Pot 3.
    FIGURE 5-1:
    Resistor Block Diagram.
    5.1
    Resistor Ladder Module
    The resistor ladder is a series of equal value resistors
    (RS) with a connection point (tap) between the two
    resistors. The total number of resistors in the series
    (ladder) determines the RAB resistance (see Figure 5-
    1). The end points of the resistor ladder are connected
    to analog switches which are connected to the device
    Terminal A and Terminal B pins. The RAB (and RS)
    resistance has small variations over voltage and
    temperature.
    For an 8-bit device, there are 256 resistors in a string
    between terminal A and terminal B. The wiper can be
    set to tap onto any of these 256 resistors, thus
    providing 257 possible settings (including terminal A
    and terminal B).
    For a 7-bit device, there are 128 resistors in a string
    between terminal A and terminal B. The wiper can be
    set to tap onto any of these 128 resistors, thus
    providing 129 possible settings (including terminal A
    and terminal B).
    Equation 5-1 shows the calculation for the step
    resistance.
    EQUATION 5-1:
    RS CALCULATION
    RS
    A
    RS
    B
    257
    256
    255
    1
    0
    RW (1)
    W
    (01h)
    Analog Mux
    RW (1)
    (00h)
    RW (1)
    (FEh)
    RW (1)
    (FFh)
    RW (1)
    (100h)
    Note 1:
    The wiper resistance is dependent on
    several factors including, wiper code,
    device VDD, Terminal voltages (on A, B,
    and W), and temperature.
    Also for the same conditions, each tap
    selection resistance has a small variation.
    This RW variation has greater effects on
    some specifications (such as INL) for the
    smaller
    resistance
    devices
    (5.0 k
    Ω)
    compared to larger resistance devices
    (100.0 k
    Ω).
    RAB
    8-Bit
    N =
    128
    127
    126
    1
    0
    (01h)
    (00h)
    (7Eh)
    (7Fh)
    (80h)
    7-Bit
    N =
    R
    S
    R
    AB
    256
    ()
    -------------
    =
    R
    S
    R
    AB
    128
    ()
    --------------
    =
    8-bit Device
    7-bit Device
    
    
    
    
    
    


    


    

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