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ISL23415 Datasheet

Low Voltage Digitally Controlled Potentiometer

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DATASHEET
ISL23415
Single, Low Voltage Digitally Controlled Potentiometer (XDCP™)
FN7780
Rev 2.00
September 14, 2015
The ISL23415 is a volatile, low voltage, low noise, low power,
SPI™ 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
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 ISL23415’s wiper will
always commence at mid-scale (128 tap position).
The low voltage, low power consumption, and small package
of the ISL23415 make it an ideal choice for use in battery
operated equipment. In addition, the ISL23415 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 ISL23415 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
• SPI serial interface
- No additional level translator for low bus supply
- Daisy Chaining of multiple DCP
• Power supply
- VCC = 1.7V to 5.5V analog power supply
- VLOGIC = 1.2V to 5.5V SPI bus/logic power supply
• Wiper resistance: 70typical @ VCC = 3.3V
• Shutdown Mode - forces the DCP into an end-to-end open
circuit and RW is shorted to RL internally
• Power-on preset to mid-scale (128 tap position)
• Shutdown and standby current <2.8µA max
• DCP terminal voltage from 0V to VCC
• 10k 50kor 100ktotal 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
• Gain adjustment in battery powered instruments
• Portable medical equipment calibration
10000
8000
6000
4000
2000
00 50 100 150 200 250
TAP POSITION (DECIMAL)
FIGURE 1. FORWARD AND BACKWARD RESISTANCE vs TAP
POSITION, 10k
FIGURE 2. VREF ADJUSTMENT
FN7780 Rev 2.00
September 14, 2015
Page 1 of 20


Renesas Electronics Components Datasheet

ISL23415 Datasheet

Low Voltage Digitally Controlled Potentiometer

No Preview Available !

ISL23415
Block Diagram
VLOGIC
SCK
SDI
SDO
CS
I/O BLOCK
LEVEL
SHIFTER
Pin Configurations
ISL23415
(10 LD MSOP)
TOP VIEW
VLOGIC
SCK
SDO
SDI
CS
1O
2
3
4
5
10
9
8
7
6
GND
VCC
RH
RW
RL
ISL23415
(10 LD µTQFN)
TOP VIEW
O
SCK 1
SDO 2
SDI 3
CS 4
9 GND
8 VCC
7 RH
6 RW
VCC
POWER-UP
INTERFACE,
CONTROL
AND
STATUS
LOGIC
WR
VOLATILE
REGISTER
AND
WIPER
CONTROL
CIRCUITRY
RH
GND
RL
RW
Pin Descriptions
MSOP
1
µTQFN
10
21
32
43
54
65
76
87
98
10 9
SYMBOL
DESCRIPTION
VLOGIC SPI bus/logic supply.
Range 1.2V to 5.5V
SCK Logic Pin - Serial bus clock input
SDO Logic Pin - Serial bus data output
(configurable)
SDI Logic Pin - Serial bus data input
CS Logic Pin - Active low Chip Select
RL DCP “low” terminal
RW DCP wiper terminal
RH DCP “high” terminal
VCC Analog power supply.
Range 1.7V to 5.5V
GND Ground pin
FN7780 Rev 2.00
September 14, 2015
Page 2 of 20


Part Number ISL23415
Description Low Voltage Digitally Controlled Potentiometer
Maker Renesas
Total Page 20 Pages
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