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ISL23418TFRUZ-TK PDF预览

ISL23418TFRUZ-TK

更新时间: 2024-11-06 12:20:31
品牌 Logo 应用领域
英特矽尔 - INTERSIL 电位器
页数 文件大小 规格书
20页 927K
描述
Single, 128-Tap, Low Voltage Digitally Controlled Potentiometer (XDCP™)

ISL23418TFRUZ-TK 数据手册

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Single, 128-Tap, Low Voltage Digitally Controlled  
Potentiometer (XDCP™)  
ISL23418  
The ISL23418 is a volatile, low voltage, low noise, low power,  
SPI™ bus, 128 taps, single digitally controlled potentiometer  
(DCP), which integrates DCP core, wiper switches, and control  
logic on a monolithic CMOS integrated circuit.  
Features  
• 128 Resistor Taps  
• SPI Serial Interface  
- No Additional Level Translator for Low Bus Supply  
- Daisy Chaining of Multiple DCP  
The digitally controlled potentiometer is implemented with a  
combination of resistor elements and CMOS switches. The  
position of the wiper is controlled by the user through the SPI  
bus interface. The potentiometer has an associated volatile  
Wiper Register (WR) that can be directly written to and read by  
the user. The contents of the WR controls the position of the  
wiper. When powered on, the ISL23418 wiper always  
commences at mid-scale (64-tap position).  
• Wiper Resistance: 70Ω Typical @ V = 3.3V  
CC  
• Shutdown Mode: Forces DCP into End-to-end Open Circuit;  
RW Shorted to RL Internally  
• Power-on Preset to Mid-scale (64-tap Position)  
• Shutdown and Standby Current <2.8µA Max  
• Power Supply  
- V = 1.7V to 5.5V Analog Power Supply  
CC  
The low voltage, low power consumption, and small package  
size of the ISL23418 make it an ideal choice for use in battery  
- V  
LOGIC  
= 1.2V to 5.5V SPI Bus/Logic Power Supply  
operated equipment. The ISL23418 has a V  
down to 1.2V bus operation, independent from the V value.  
pin allowing  
LOGIC  
• DCP Terminal Voltage from 0V to V  
CC  
CC  
• 10kΩ, 50kΩ or 100kΩ Total Resistance  
• Extended Industrial Temperature Range: -40°C to +125°C  
• 10 Ld MSOP or 10 Ld µTQFN Packages  
• Pb-free (RoHS compliant)  
This allows for low logic levels to be connected directly to the  
ISL23418 without passing through a voltage level shifter.  
The DCP can be used as a three-terminal potentiometer or as a  
two-terminal variable resistor in a wide variety of applications  
including control, parameter adjustments, and signal  
processing.  
Applications  
• Power Supply Margining  
Related Literature  
• See ISL23415, “Single, Low Voltage Digitally Controlled  
Potentiometer (XDCP™)”  
• RF Power Amplifier Bias Compensation  
• LCD Bias Compensation  
• Gain Adjustment in Battery Powered Instruments  
• Portable Medical Equipment Calibration  
10000  
8000  
6000  
4000  
2000  
0
VREF  
RH1  
-
VREF_M  
RW1  
ISL23418  
+
ISL28114  
RL1  
0
25  
50  
75  
100  
125  
TAP POSITION (DECIMAL)  
FIGURE 1. FORWARD AND BACKWARD RESISTANCE vs TAP  
POSITION, 10k  
FIGURE 2. V  
ADJUSTMENT  
REF  
August 3, 2011  
FN7901.0  
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.  
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2011. All Rights Reserved  
XDCP is a trademark of Intersil Americas Inc. Intersil (and design) is a trademark owned by Intersil Corporation  
or one of its subsidiaries .All other trademarks mentioned are the property of their respective owners.  
1

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