ISL23315_15 Datasheet, PDF (1/20 Pages) Intersil Corporation – Single, Low Voltage Digitally Controlled Potentiometer(XDCP™)

DATASHEET
Single, Low Voltage Digitally Controlled Potentiometer
(XDCP™)
ISL23315
The ISL23315 is a volatile, low voltage, low noise, low power, I²C
Bus^™, 256 Taps, single digitally controlled potentiometer (DCP),
which integrates DCP core, wiper switches and control logic on
a monolithic CMOS integrated circuit.
The 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
I²C 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 ISL23315’s wiper will
always commence at mid-scale (128 tap position).
The low voltage, low power consumption, and small package
of the ISL23315 make it an ideal choice for use in battery
operated equipment. In addition, the ISL23315 has a V_LOGIC
pin allowing down to 1.2V bus operation, independent from the
V_CC value. This allows for low logic levels to be connected
directly to the ISL23315 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.
Features
• 256 resistor taps
• I²C serial interface
- No additional level translator for low bus supply
- Two address pins allow up to four devices per bus
• Power supply
- V_CC = 1.7V to 5.5V analog power supply
- V_LOGIC = 1.2V to 5.5V I²C bus/logic power supply
• Wiper resistance: 70 typical @ V_CC = 3.3V
• Shutdown Mode - forces the DCP into an end-to-end open
circuit and R_W is shorted to R_L internally
• Power-on preset to mid-scale (128 tap position)
• Shutdown and standby current <2.8µA max
• DCP terminal voltage from 0V to V_CC
• 10k 50kor 100k total resistance
• Extended industrial temperature range: -40°C to +125°C
• 10 Ld MSOP or 10 Ld µTQFN packages
• Pb-free (RoHS compliant)
Applications
• Power supply margining
• RF power amplifier bias compensation
• LCD bias compensation
• Laser diode bias compensation
10000
8000
6000
4000
2000
00
50
100
150
200
250
TAP POSITION (DECIMAL)
FIGURE 1. FORWARD AND BACKWARD RESISTANCE vs TAP
POSITION, 10k DCP
FIGURE 2. V_REF ADJUSTMENT
August 12, 2015
1
FN7778.2
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 2010, 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