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ISL23448 Datasheet

Low Voltage Digitally Controlled Potentiometer

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ISL23448
NOT RECOMMENDED FOR NEW DESIGNS
RECOMMENDED REPLACEMENT PART
ISL23428
Quad, 128 Tap, Low Voltage Digitally Controlled Potentiometer (XDCP™)
DATASHEET
FN7905
Rev 0.00
August 19, 2011
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 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 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.
Applications
• Power supply margining
• Trimming sensor circuits
• Gain adjustment in battery powered instruments
• RF power amplifier bias compensation
Features
• Four potentiometers per package
• 128 resistor taps
• 10kΩ50kΩor 100kΩ total resistance
• SPI serial interface
- No additional level translator for low bus supply
- Daisy Chaining of multiple DCPs
• Power supply
- VCC = 1.7V to 5.5V analog power supply
- VLOGIC = 1.2V to 5.5V SPI bus/logic power supply
• Maximum supply current without serial bus activity
(standby)
- 5µA @ VCC and VLOGIC = 5V
- 2µA @ 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
• Wiper resistance: 70Ω typical @ VCC = 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)
10000
8000
6000
4000
2000
0
0 32 64 96 128
TAP POSITION (DECIMAL)
FIGURE 1. FORWARD AND BACKWARD RESISTANCE vs TAP
POSITION, 10kDCP
VREF
RH1
1 DCP
OF
ISL23448
RW1
RL1
-
+
ISL28114
VREF_M
FIGURE 2. VREF ADJUSTMENT
FN7905 Rev 0.00
August 19, 2011
Page 1 of 21


Renesas Electronics Components Datasheet

ISL23448 Datasheet

Low Voltage Digitally Controlled Potentiometer

No Preview Available !

ISL23448
Block Diagram
VLOGIC
SDI
SDO
SCK
CS
I/O
BLOCK
LEVEL
SHIFTER
Pin Configurations
ISL23448
(20 LD TSSOP)
TOP VIEW
RL0 1
RW0 2
VCC 3
RH0 4
RL1 5
RW1 6
RH1 7
GND 8
VLOGIC 9
SDI 10
20 RL3
19 RW3
18 RH3
17 RL2
16 RW2
15 RH2
14 SCK
13 SDO
12 GND
11 CS
ISL23448
(20 LD QFN)
TOP VIEW
20 19 18 17
VCC 1
RH0 2
RL1 3
RW1 4
RH1 5
GND 6
166 RH3
15 RL2
14 RW2
13 RH2
12 SCK
11 SDO
7 8 9 10
VCC
POWER UP
INTERFACE
CONTROL
AND
STATUS
LOGIC
GND
WR0
VOLATILE
REGISTER
WR1
VOLATILE
REGISTER
WR2
VOLATILE
REGISTER
WR3
VOLATILE
REGISTER
RH0
RW0
RL0
RH1
RW1
RL1
RH2
RW2
RL2
RH3
RW3
RL3
Pin Descriptions
TSSOP
1
2
3
QFN
19
20
1
4
5
6
7
8, 12
9
2
3
4
5
6, 10
7
10 8
11 9
13 11
14 12
15 13
16 14
17 15
18 16
19 17
20 18
SYMBOL
DESCRIPTION
RL0 DCP0 “low” terminal
RW0 DCP0 wiper terminal
VCC Analog power supply.
Range 1.7V to 5.5V
RH0 DCP0 “high” terminal
RL1 DCP1 “low” terminal
RW1 DCP1 wiper terminal
RH1 DCP1 “high” terminal
GND Ground pin
VLOGIC SPI bus/logic supply
Range 1.2V to 5.5V
SDI Logic Pin - Serial bus data input
CS Logic Pin - Active low chip select
SDO Logic Pin - Serial bus data output
(configurable)
SCK Logic Pin - Serial bus clock input
RH2 DCP2 “high” terminal
RW2 DCP2 wiper terminal
RL2 DCP2 “low” terminal
RH3 DCP3 “high” terminal
RW3 DCP3 wiper terminal
RL3 DCP3 “low” terminal
FN7905 Rev 0.00
August 19, 2011
Page 2 of 21


Part Number ISL23448
Description Low Voltage Digitally Controlled Potentiometer
Maker Renesas
Total Page 21 Pages
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