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ISL23418 Datasheet PDF - Intersil Corporation

Part Number ISL23418
Description Low Voltage Digitally Controlled Potentiometer
Manufacturers Intersil Corporation 
Logo Intersil Corporation Logo 

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ISL23418 datasheet, circuit
www.DataSheet.co.kr
Single, 128-Tap, Low Voltage Digitally Controlled
Potentiometer (XDCP™)
ISL23418
The ISL23418 is a volatile, low voltage, low noise, low power,
SPI™ bus, 128 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 wiper is 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 ISL23418 wiper always
commences at mid-scale (64-tap position).
The low voltage, low power consumption, and small package
size of the ISL23418 make it an ideal choice for use in battery
operated equipment. The ISL23418 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
ISL23418 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.
Related Literature
• See ISL23415, “Single, Low Voltage Digitally Controlled
Potentiometer (XDCP™)”
Features
• 128 Resistor Taps
• SPI Serial Interface
- No Additional Level Translator for Low Bus Supply
- Daisy Chaining of Multiple DCP
• Wiper Resistance: 70Ω Typical @ VCC = 3.3V
• Shutdown Mode: Forces DCP into End-to-end Open Circuit;
RW Shorted to RL Internally
• Power-on Preset to Mid-scale (64-tap Position)
• Shutdown and Standby Current <2.8µA Max
• Power Supply
- VCC = 1.7V to 5.5V Analog Power Supply
- VLOGIC = 1.2V to 5.5V SPI Bus/Logic Power Supply
• DCP Terminal Voltage from 0V to VCC
• 10kΩ, 50kΩ or 100kΩ 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
• Gain Adjustment in Battery Powered Instruments
• Portable Medical Equipment Calibration
10000
8000
6000
4000
2000
00 25 50 75 100 125
TAP POSITION (DECIMAL)
FIGURE 1. FORWARD AND BACKWARD RESISTANCE vs TAP
POSITION, 10k
VREF
RH1
ISL23418
RW1
RL1
-
+
ISL28114
VREF_M
FIGURE 2. VREF ADJUSTMENT
August 3, 2011
FN7901.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2011. All Rights Reserved
XDCP is a trademark of Intersil Americas Inc. Intersil (and design) is a trademark owned by Intersil Corporation
or one of its subsidiaries .All other trademarks mentioned are the property of their respective owners.
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ISL23418 equivalent
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ISL23418
Analog Specifications VCC = 2.7V to 5.5V, VLOGIC = 1.2V to 5.5V over recommended operating conditions unless otherwise stated.
Boldface limits apply over the operating temperature range, -40°C to +125°C. (Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
(Note 20)
TYP
(Note 8)
MAX
(Note 20)
UNITS
DNL Differential Non-linearity, Guaranteed W, U, T option
(Note 12) Monotonic
-0.5
±0.15
+0.5
LSB
(Note 9)
FSerror Full-scale Error
(Note 11)
W option
-2.5 -1.5
0 LSB
(Note 9)
U, T option
-1.0 -0.7
0 LSB
(Note 9)
ZSerror Zero-scale Error
(Note 10)
W option
0 -1.5 2.5 LSB
(Note 9)
U, T option
0 -0.7 1.0 LSB
(Note 9)
TCV Ratiometric Temperature Coefficient
(Note 14)
W option, Wiper Register set to 40 hex
U option, Wiper Register set to 40 hex
8
4
ppm/°C
ppm/°C
T option, Wiper Register set to 40 hex 2.3 ppm/°C
tLS_Settling Large Signal Wiper Settling Time
fcutoff -3dB Cutoff Frequency
From code 0 to 7F hex
Wiper at middle point W option
Wiper at middle point U option
300
1200
250
ns
kHz
kHz
Wiper at middle point T option
120 kHz
RHEOSTAT MODE (Measurements between RW and RL pins with RH not connected, or between RW and RH with RL not connected)
RINL Integral Non-linearity, Guaranteed
(Note 18) Monotonic
W option; VCC = 2.7V to 5.5V
-1.0
±0.5
+1.0
MI
(Note 15)
W option; VCC = 1.7V
±3.0
MI
(Note 15)
U, T option; VCC = 2.7V to 5.5V
-0.5
±0.15
+0.5
MI
(Note 15)
U, T option; VCC = 1.7V
±1.0
MI
(Note 15)
RDNL Differential Non-linearity, Guaranteed W option; VCC = 2.7V to 5.5V
(Note 17) Monotonic
-0.5
±0.15
+0.5
MI
(Note 15)
W option; VCC = 1.7V
±0.4
MI
(Note 15)
U, T option; VCC = 2.7V to 5.5V
-0.5
±0.15
+0.5
MI
(Note 15)
U, T option; VCC = 1.7V
±0.4
MI
(Note 15)
Roffset Offset, Wiper at 0 Position
(Note 16)
W option; VCC = 2.7V to 5.5V
0
1.8 3.0
MI
(Note 15)
W option; VCC = 1.7V
3.0 MI
(Note 15)
U, T option; VCC = 2.7V to 5.5V
0 0.3 1
MI
(Note 15)
U, T option; VCC = 1.7V
0.5 MI
(Note 15)
5 FN7901.0
August 3, 2011
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