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ISL23425UFVZ Arkusz danych(PDF) 1 Page - Intersil Corporation

Numer części ISL23425UFVZ
Szczegółowy opis  Dual, 256-Tap, Low Voltage Digitally Contro Potentiometer (XDCP??
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Producent  INTERSIL [Intersil Corporation]
Strona internetowa  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL23425UFVZ Arkusz danych(HTML) 1 Page - Intersil Corporation

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DATASHEET
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
| Copyright Intersil Americas LLC 2011, 2015. 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
Dual, 256-Tap, Low Voltage Digitally Controlled
Potentiometer (XDCP™)
ISL23425
The ISL23425 is a volatile, low voltage, low noise, low power,
256-tap, dual digitally controlled potentiometer (DCP) with an
SPI Bus™ interface. It integrates two 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) 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 ISL23425 make it an ideal choice for use in battery
operated equipment. In addition, the ISL23425 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 ISL23425 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
• Two potentiometers per package
• 256 resistor taps
•10k
 50kor 100k 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)
- 4µA @ VCC and VLOGIC = 5V
- 1.7µA @ 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
 typical @ VCC = 3.3V
• Power-on preset to mid-scale (128 tap position)
• Extended industrial temperature range: -40°C to +125°C
• 14 Ld TSSOP or 16 Ld µTQFN 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
TAP POSITION (DECIMAL)
0
64
128
192
256
VREF_M
ISL28114
1 DCP
OF
ISL23325
+
-
VREF
RL1
RW1
RH1
September 11, 2015
FN7873.1


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