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ISL23445 Folha de dados(PDF) 1 Page - Intersil Corporation

Nome de Peças ISL23445
Descrição Electrónicos  Quad, 256 Tap, Low Voltage Digitally Controlled Potentiometer (XDCP??
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Fabricante Electrônico  INTERSIL [Intersil Corporation]
Página de início  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL23445 Folha de dados(HTML) 1 Page - Intersil Corporation

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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
Intersil (and design) and XDCP are trademarks owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners
Quad, 256 Tap, Low Voltage Digitally Controlled
Potentiometer (XDCP™)
ISL23445
The ISL23445 is a volatile, low voltage, low noise, low power, 256
tap, quad digitally controlled potentiometer (DCP) with an SPI
Businterface. It integrates four DCP cores, wiper switches
and control logic on a monolithic CMOS integrated circuit.
Each digitally controlled potentiometer is implemented with a
combination of resistor elements and CMOS switches. The
position of the wipers are controlled by the user through the
SPI bus interface. Each potentiometer has an associated
volatile Wiper Register (WRi, i = 0, 1, 2, 3) that can be directly
written to and read by the user. The contents of the WRi
controls the position of the wiper. When powered on, the wiper
of each DCP will always commence at mid-scale (128 tap
position).
The low voltage, low power consumption, and small package
of the ISL23445 make it an ideal choice for use in battery
operated equipment. In addition, the ISL23445 has a VLOGIC
pin allowing down to 1.2V bus operation, independent from the
VCC value. This allows for low logic levels to be connected
directly to the ISL23445 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
• Trimming sensor circuits
• Gain adjustment in battery powered instruments
• RF power amplifier bias compensation
Features
• Four potentiometers per package
• 256 resistor taps
•10k
Ω, 50kΩ or 100kΩ total resistance
• SPI serial interface
- No additional level translator for low bus supply
- Daisy Chaining of multiple DCPs
• Maximum supply current without serial bus activity
(standby)
- 5µA @ VCC and VLOGIC = 5V
-2uA @ VCC and VLOGIC = 1.7V
•Shutdown Mode
- Forces the DCP into an end-to-end open circuit and RWi is
connected to RLi internally
- Reduces power consumption by disconnecting the DCP
resistor from the circuit
•Power supply
-VCC = 1.7V to 5.5V analog power supply
-VLOGIC = 1.2V to 5.5V SPI bus/logic power supply
• Wiper resistance: 70
Ω typical @ VCC = 3.3V
• Power-on preset to mid-scale (128 tap position)
• Extended industrial temperature range: -40°C to +125°C
• 20 Ld TSSOP or 20 Ld QFN packages
• Pb-free (RoHS compliant)
FIGURE 1. FORWARD AND BACKWARD RESISTANCE vs TAP
POSITION, 10kΩ DCP
FIGURE 2. VREF ADJUSTMENT
0
2000
4000
6000
8000
10000
0
64
128
192
256
TAP POSITION (DECIMAL)
VREF_M
ISL28114
1 DCP
of
ISL23445
+
-
VREF
RL1
RW1
RH1
June 21, 2011
FN7874.0


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