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    參數(shù)資料
    

    


    


    
型號(hào)：
AD5248BRM10-RL7

    

    
廠商：
Analog Devices Inc

    

    
文件頁(yè)數(shù)：
6/20頁(yè)

    

    
文件大?。?/td>
0K

    

    
描述：
IC DGTL POT DUAL 10K I2C 10-MSOP

    

    
標(biāo)準(zhǔn)包裝：
1,000

    

    
接片：
256
    		

    

    
電阻（歐姆）：
10k
    		

    

    
電路數(shù)：
2
    		

    

    
溫度系數(shù)：
標(biāo)準(zhǔn)值 35 ppm/°C
    		

    

    
存儲(chǔ)器類型：
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：
10-TFSOP，10-MSOP（0.118"，3.00mm 寬）
    		

    

    
供應(yīng)商設(shè)備封裝：
10-MSOP
    		

    

    
包裝：
帶卷 (TR)
    		

    

    
配用：
AD5248EVAL-ND - BOARD EVAL FOR AD5248
    		

    

    

    

	
    
    
    

    
    
	
    AD5243/AD5248
    Data Sheet
    Rev. B | Page 14 of 20
    PROGRAMMING THE POTENTIOMETER DIVIDER
    Voltage Output Operation
    The digital potentiometer easily generates a voltage divider at
    wiper to B and wiper to A, proportional to the input voltage at
    A to B. Unlike the polarity of VDD to GND, which must be
    positive, voltage across A to B, W to A, and W to B can be at
    either polarity.
    A
    VI
    W
    B
    VO
    04109-0-014
    Figure 39. Potentiometer Mode Configuration
    If ignoring the effect of the wiper resistance for approximation,
    connecting the A terminal to 5 V and the B terminal to ground
    produces an output voltage at the wiper to B, starting at 0 V up
    to 1 LSB less than 5 V. Each LSB of voltage is equal to the voltage
    applied across Terminal A and Terminal B divided by the
    256 positions of the potentiometer divider. The general equation
    defining the output voltage at VW with respect to ground for any
    valid input voltage applied to Terminal A and Terminal B is
    B
    A
    W
    V
    D
    V
    D
    V
    256
    )
    (
    +
    =
    (3)
    Operation of the digital potentiometer in the divider mode
    results in more accurate operation over temperature. Unlike in
    the rheostat mode, the output voltage is dependent mainly on
    the ratio of the internal resistors, RWA and RWB, not on the
    absolute values. Therefore, the temperature drift reduces to
    15 ppm/°C.
    ESD PROTECTION
    All digital inputs are protected with a series of input resistors
    and parallel Zener ESD structures, as shown in Figure 40 and
    Figure 41. This applies to the SDA, SCL, AD0, and AD1 digital
    input pins (AD5248 only).
    LOGIC
    340
    GND
    04109-0-015
    Figure 40. ESD Protection of Digital Pins
    A, B, W
    GND
    04109-0-016
    Figure 41. ESD Protection of Resistor Terminals
    TERMINAL VOLTAGE OPERATING RANGE
    The AD5243/AD5248 VDD and GND power supply defines the
    boundary conditions for proper 3-terminal digital potentiometer
    operation. Supply signals present on the A, B, and W terminals
    that exceed VDD or GND are clamped by the internal forward-
    biased diodes (see Figure 42).
    GND
    A
    W
    B
    VDD
    04109-0-017
    Figure 42. Maximum Terminal Voltages Set by VDD and GND
    POWER-UP SEQUENCE
    Because the ESD protection diodes limit the voltage compliance
    at the A, B, and W terminals (see Figure 42), it is important to
    power VDD/GND before applying voltage to the A, B, and W
    terminals; otherwise, the diode is forward-biased such that VDD
    is powered unintentionally and may affect the rest of the user’s
    circuit. The ideal power-up sequence is in the following order:
    GND, VDD, digital inputs, and then VA, VB, and VW. The relative
    order of powering VA, VB, VW, and the digital inputs is not
    important, as long as they are powered after VDD/GND.
    LAYOUT AND POWER SUPPLY BYPASSING
    It is a good practice to employ compact, minimum lead length
    layout design. The leads to the inputs should be as direct as
    possible with a minimum conductor length. Ground paths
    should have low resistance and low inductance.
    Similarly, it is also good practice to bypass the power supplies with
    quality capacitors for optimum stability. Supply leads to the device
    should be bypassed with disc or chip ceramic capacitors of 0.01 F
    to 0.1 F. Low ESR 1 F to 10 F tantalum or electrolytic capacitors
    should also be applied at the supplies to minimize any transient
    disturbance and low frequency ripple (see Figure 43). In addition,
    note that the digital ground should be joined remotely to the
    analog ground at one point to minimize the ground bounce.
    VDD
    GND
    VDD
    C3
    10
    F
    C1
    0.1
    F
    AD5243
    +
    04109-0-018
    Figure 43. Power Supply Bypassing
    
    
    
    
    
    


    


    

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AD5248BRM2.5
功能描述:IC DGTL POT DUAL 2.5K I2C 10MSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:DPP 接片:32 電阻（歐姆）:10k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 300 ppm/°C 存儲(chǔ)器類型:非易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.5 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN（2x3） 包裝:帶卷 (TR)

    

    
AD5248BRM2.5-RL7
功能描述:IC DGTL POT DUAL 2.5K I2C 10MSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:DPP 接片:32 電阻（歐姆）:10k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 300 ppm/°C 存儲(chǔ)器類型:非易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.5 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN（2x3） 包裝:帶卷 (TR)

    

    
AD5248BRM50
功能描述:IC DGTL POT DUAL 50K I2C 10-MSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:DPP 接片:32 電阻（歐姆）:10k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 300 ppm/°C 存儲(chǔ)器類型:非易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.5 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN（2x3） 包裝:帶卷 (TR)

    

    
AD5248BRM50-RL7
功能描述:IC DGTL POT DUAL 50K I2C 10-MSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:DPP 接片:32 電阻（歐姆）:10k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 300 ppm/°C 存儲(chǔ)器類型:非易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.5 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN（2x3） 包裝:帶卷 (TR)

    

    
AD5248BRMZ10
功能描述:IC DGTL POT DUAL 10K I2C 10-MSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS
	Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 接片:256 電阻（歐姆）:100k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 35 ppm/°C 存儲(chǔ)器類型:非易失 接口:3 線串口 電源電壓:2.7 V ~ 5.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN-EP（3x3） 包裝:剪切帶 (CT) 產(chǎn)品目錄頁(yè)面:1399 (CN2011-ZH PDF) 其它名稱:MAX5423ETA+TCT

    

    
    
    
    
	
    	
    
    
     
     
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