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ISL23448TFRZ-TK

Description
digital potentiometer ics 128 tap volatile spi QD FL rng dcp 20ld
Categorysemiconductor    Other integrated circuit (IC)   
File Size1MB,21 Pages
ManufacturerIntersil ( Renesas )
Websitehttp://www.intersil.com/cda/home/
Environmental Compliance  
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ISL23448TFRZ-TK Overview

digital potentiometer ics 128 tap volatile spi QD FL rng dcp 20ld

ISL23448TFRZ-TK Parametric

Parameter NameAttribute value
ManufactureIntersil
Product CategoryDigital Potentiometer ICs
RoHSYes
Resistance100 KOhms
Number of POTsQuad
Taps per POT128
Wiper MemoryVolatile
Digital InterfaceSerial (SPI)
Operating Supply Voltage3.3 V
Supply Curre110 uA
Maximum Operating Temperature+ 125 C
Package / CaseQFN EP
PackagingReel
Minimum Operating Temperature- 40 C
Factory Pack Quantity1000
Supply Voltage - Max5.5 V
Supply Voltage - Mi1.7 V
ISL23448
NOT RECOMMENDED FOR NEW DESIGNS
RECOMMENDED REPLACEMENT PART
ISL23428
DATASHEET
FN7905
Rev 0.00
August 19, 2011
Quad, 128 Tap, Low Voltage Digitally Controlled Potentiometer (XDCP™)
The ISL23448 is a volatile, low voltage, low noise, low power,
128 tap, quad digitally controlled potentiometer (DCP) with an
SPI Bus™ interface. 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 (64 tap
position).
The low voltage, low power consumption, and small package
of the ISL23448 make it an ideal choice for use in battery
operated equipment. In addition, the ISL23448 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 ISL23448 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
• Four potentiometers per package
• 128 resistor taps
• 10kΩ 50kΩor 100kΩ total resistance
• SPI serial interface
- No additional level translator for low bus supply
- Daisy Chaining of multiple DCPs
• Power supply
- V
CC
= 1.7V to 5.5V analog power supply
- V
LOGIC
= 1.2V to 5.5V SPI bus/logic power supply
• Maximum supply current without serial bus activity
(standby)
- 5µA @ V
CC
and V
LOGIC
= 5V
- 2µA @ V
CC
and V
LOGIC
= 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
• Wiper resistance: 70Ω typical @ V
CC
= 3.3V
• Power-on preset to mid-scale (64 tap position)
• Extended industrial temperature range: -40
°
C to +125
°
C
• 20 Ld TSSOP or 20 Ld QFN packages
• Pb-free (RoHS compliant)
Applications
• Power supply margining
• Trimming sensor circuits
• Gain adjustment in battery powered instruments
• RF power amplifier bias compensation
10000
V
REF
8000
RESISTANCE (Ω)
6000
RH1
-
V
REF_M
4000
1 DCP
OF
ISL23448
RW1
+
ISL28114
2000
RL1
0
0
32
64
TAP POSITION (DECIMAL)
96
128
FIGURE 1. FORWARD AND BACKWARD RESISTANCE vs TAP
POSITION, 10kΩ DCP
FIGURE 2. V
REF
ADJUSTMENT
FN7905 Rev 0.00
August 19, 2011
Page 1 of 21

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Description digital potentiometer ics 128 tap volatile spi QD FL rng dcp 20ld digital potentiometer ics 128 tapvolatile spi quad rng ind 20ld digital potentiometer ics 128 tapvolatile spi quad rng ind 20ld digital potentiometer ics 128 tap volatile spi QD FL rng dcp 20ld
Manufacture Intersil Intersil Intersil Intersil
Product Category Digital Potentiometer ICs Digital Potentiometer ICs Digital Potentiometer ICs Digital Potentiometer ICs
RoHS Yes Yes Yes Yes
Resistance 100 KOhms 10 KOhms 100 KOhms 10 KOhms
Number of POTs Quad Quad Quad Quad
Taps per POT 128 128 128 128
Wiper Memory Volatile Volatile Volatile Volatile
Digital Interface Serial (SPI) Serial (SPI) Serial (SPI) Serial (SPI)
Operating Supply Voltage 3.3 V 3.3 V 3.3 V 3.3 V
Supply Curre 110 uA 110 uA 110 uA 110 uA
Maximum Operating Temperature + 125 C + 125 C + 125 C + 125 C
Package / Case QFN EP QFN EP QFN EP TSSOP-20
Packaging Reel Reel Reel Reel
Minimum Operating Temperature - 40 C - 40 C - 40 C - 40 C
Factory Pack Quantity 1000 250 250 1000
Supply Voltage - Max 5.5 V 5.5 V 5.5 V 5.5 V
Supply Voltage - Mi 1.7 V 1.7 V 1.7 V 1.7 V
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