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 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
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.
Features
• 128 Resistor Taps
• SPI Serial Interface
- No Additional Level Translator for Low Bus Supply
- Daisy Chaining of Multiple DCP
• Wiper Resistance: 70Ω Typical @ V
CC
= 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
- V
CC
= 1.7V to 5.5V Analog Power Supply
- V
LOGIC
= 1.2V to 5.5V SPI Bus/Logic Power Supply
• DCP Terminal Voltage from 0V to V
CC
• 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)
Related Literature
• See
ISL23415,
“Single, Low Voltage Digitally Controlled
Potentiometer (XDCP™)”
Applications
• Power Supply Margining
• RF Power Amplifier Bias Compensation
• LCD Bias Compensation
• Gain Adjustment in Battery Powered Instruments
• Portable Medical Equipment Calibration
10000
V
REF
8000
RESISTANCE (Ω)
6000
RH1
-
V
REF_M
4000
ISL23418
RW1
+
ISL28114
2000
RL1
0
0
25
50
75
100
125
TAP POSITION (DECIMAL)
FIGURE 1. FORWARD AND BACKWARD RESISTANCE vs TAP
POSITION, 10k
FIGURE 2. V
REF
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.
ISL23418
Block Diagram
V
LOGIC
V
CC
SCK
SDI
SDO
CS
I/O BLOCK
LEVEL
SHIFTER
POWER-UP
INTERFACE,
CONTROL
AND
STATUS
LOGIC
RH
WR
VOLATILE
REGISTER
AND
WIPER
CONTROL
CIRCUITRY
RL
RW
GND
Pin Configurations
ISL23418
(10 LD MSOP)
TOP VIEW
V
LOGIC
SCK
SDO
SDI
CS
1
2
3
4
5
O
10
9
8
7
6
GND
V
CC
RH
RW
RL
Pin Description
MSOP
1
2
3
4
5
µTQFN
10
1
2
3
4
5
6
7
8
9
SYMBOL
V
LOGIC
SCK
SDO
SDI
CS
RL
RW
RH
V
CC
GND
DESCRIPTION
SPI bus/logic supply; range 1.2V to
5.5V
Logic pin: serial bus clock input
Logic pin: serial bus data output
(configurable)
Logic pin: serial bus data input
Logic pin: active low Chip Select
DCP “low” terminal
DCP wiper terminal
DCP “high” terminal
Analog power supply; range 1.7V to
5.5V
Ground pin
ISL23418
(10 LD µTQFN)
TOP VIEW
10 V
LOGIC
6
7
8
9
9
8
7
6
GND
V
CC
RH
RW
O
SCK
SDO
SDI
CS
1
2
3
4
10
2
RL
5
FN7901.0
August 3, 2011
ISL23418
Ordering Information
PART NUMBER
(Note 5)
ISL23418TFUZ (Notes 1, 3)
ISL23418UFUZ (Notes 1, 3)
ISL23418WFUZ (Notes 1, 3)
ISL23418TFRUZ-T7A (Notes 2, 4)
ISL23418TFRUZ-TK (Notes 2, 4)
ISL23418UFRUZ-T7A (Notes 2, 4)
ISL23418UFRUZ-TK (Notes 2, 4)
ISL23418WFRUZ-T7A (Notes 2, 4)
ISL23418WFRUZ-TK (Notes 2, 4)
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to
TB347
for details on reel specifications.
2. Please refer to
TB347
for details on reel specifications.
3. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
4. These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and NiPdAu plate -
e4 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
5. For Moisture Sensitivity Level (MSL), please see device information page for
ISL23418.
For more information on MSL please see Tech Brief
TB363.
PART
MARKING
3418T
3418U
3418W
HL
HL
HK
HK
HJ
HJ
RESISTANCE
OPTION
(kΩ)
100
50
10
100
100
50
50
10
10
TEMP. RANGE
(°C)
-40 to +125
-40 to +125
-40 to +125
-40 to +125
-40 to +125
-40 to +125
-40 to +125
-40 to +125
-40 to +125
PACKAGE
(Pb-free)
10 Ld MSOP
10 Ld MSOP
10 Ld MSOP
10 Ld 2.1x1.6 µTQFN
10 Ld 2.1x1.6 µTQFN
10 Ld 2.1x1.6 µTQFN
10 Ld 2.1x1.6 µTQFN
10 Ld 2.1x1.6 µTQFN
10 Ld 2.1x1.6 µTQFN
PKG.
DWG. #
M10.118
M10.118
M10.118
L10.2.1x1.6A
L10.2.1x1.6A
L10.2.1x1.6A
L10.2.1x1.6A
L10.2.1x1.6A
L10.2.1x1.6A
3
FN7901.0
August 3, 2011
ISL23418
Absolute Maximum Ratings
Supply Voltage Range
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.0V
V
LOGIC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.0V
Voltage on any DCP Terminal Pin . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.0V
Voltage on any Digital Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.0V
Wiper Current I
W
(10s). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±6mA
ESD Rating
Human Body Model (Tested per JESD22-A114E) . . . . . . . . . . . . . . .6.5kV
CDM Model (Tested per JESD22-A114E) . . . . . . . . . . . . . . . . . . . . . . . 1kV
Machine Model (Tested per JESD22-A115-A) . . . . . . . . . . . . . . . . . . 200V
Latch Up
(Tested per JESD-78B; Class 2, Level A) . . . . . . . . . . 100mA @ +125°C
Thermal Information
Thermal Resistance (Typical)
θ
JA
(°C/W)
θ
JC
(°C/W)
10 Ld MSOP Package (Notes 6, 7) . . . . . . .
170
70
10 Ld µTQFN Package (Notes 6, 7) . . . . . .
145
90
Maximum Junction Temperature (Plastic Package) . . . . . . . . . . . .+150°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +125°C
V
CC
Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.7V to 5.5V
V
LOGIC
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2V to 5.5V
DCP Terminal Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0 to V
CC
Max Wiper Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±3mA
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
6.
θ
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief
TB379
for details.
7. For
θ
JC
, the “case temp” location is taken at the package top center.
V
CC
= 2.7V to 5.5V, V
LOGIC
= 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.
SYMBOL
R
TOTAL
PARAMETER
R
H
to R
L
Resistance
W option
U option
T option
R
H
to R
L
Resistance Tolerance
End-to-End Temperature Coefficient
W option
U option
T option
V
RH
, V
RL
R
W
DCP Terminal Voltage
Wiper Resistance
V
RH
or V
RL
to GND
RH - floating, V
RL
= 0V, force I
W
current
to the wiper, I
W
= (V
CC
- V
RL
)/R
TOTAL,
V
CC
= 2.7V to 5.5V
V
CC
= 1.7V
C
H
/C
L
/C
W
Terminal Capacitance
I
LkgDCP
Noise
Leakage on DCP Pins
Resistor Noise Density
See “DCP Macro Model” on page 8.
Voltage at pin from GND to V
CC
Wiper at middle point, W option
Wiper at middle point, U option
Wiper at middle point, T option
Feed Thru
PSRR
Digital Feedthrough from Bus to Wiper
Power Supply Reject Ratio
Wiper at middle point
Wiper output change if V
CC
change
±10%; wiper at middle point
-0.4
0
70
-20
TEST CONDITIONS
MIN
(Note 20)
TYP
(Note 8)
10
50
100
±2
175
85
70
V
CC
200
+20
MAX
(Note 20)
UNITS
kΩ
kΩ
kΩ
%
ppm/°C
ppm/°C
ppm/°C
V
Ω
Analog Specifications
580
32/32/32
<0.1
16
49
61
-65
-75
0.4
Ω
pF
µA
nV/√Hz
nV/√Hz
nV/√Hz
dB
dB
VOLTAGE DIVIDER MODE (0V @ RL; V
CC
@ RH; measured at RW, unloaded)
INL
(Note 13)
Integral Non-linearity, Guaranteed
Monotonic
W, U, T option
-0.5
±0.15
+0.5
LSB
(Note 9)
4
FN7901.0
August 3, 2011
ISL23418
V
CC
= 2.7V to 5.5V, V
LOGIC
= 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
DNL
(Note 12)
FSerror
(Note 11)
PARAMETER
Differential Non-linearity, Guaranteed
Monotonic
Full-scale Error
TEST CONDITIONS
W, U, T option
W option
U, T option
ZSerror
(Note 10)
Zero-scale Error
W option
U, T option
TC
V
(Note 14)
Ratiometric Temperature Coefficient
W option, Wiper Register set to 40 hex
U option, Wiper Register set to 40 hex
T option, Wiper Register set to 40 hex
t
LS_Settling
Large Signal Wiper Settling Time
f
cutoff
-3dB Cutoff Frequency
From code 0 to 7F hex
Wiper at middle point W option
Wiper at middle point U option
Wiper at middle point T option
MIN
(Note 20)
-0.5
-2.5
-1.0
0
0
TYP
(Note 8)
±0.15
-1.5
-0.7
-1.5
-0.7
8
4
2.3
300
1200
250
120
MAX
(Note 20)
+0.5
0
0
2.5
1.0
UNITS
LSB
(Note 9)
LSB
(Note 9)
LSB
(Note 9)
LSB
(Note 9)
LSB
(Note 9)
ppm/°C
ppm/°C
ppm/°C
ns
kHz
kHz
kHz
Analog Specifications
RHEOSTAT MODE (Measurements between RW and RL pins with RH not connected, or between RW and RH with RL not connected)
R
INL
(Note 18)
Integral Non-linearity, Guaranteed
Monotonic
W option; V
CC
= 2.7V to 5.5V
W option; V
CC
= 1.7V
U, T option; V
CC
= 2.7V to 5.5V
U, T option; V
CC
= 1.7V
R
DNL
(Note 17)
Differential Non-linearity, Guaranteed
Monotonic
W option; V
CC
= 2.7V to 5.5V
W option; V
CC
= 1.7V
U, T option; V
CC
= 2.7V to 5.5V
U, T option; V
CC
= 1.7V
R
offset
(Note 16)
Offset, Wiper at 0 Position
W option; V
CC
= 2.7V to 5.5V
W option; V
CC
= 1.7V
U, T option; V
CC
= 2.7V to 5.5V
U, T option; V
CC
= 1.7V
0
0
-0.5
-0.5
-0.5
-1.0
±0.5
±3.0
±0.15
±1.0
±0.15
±0.4
±0.15
±0.4
1.8
3.0
0.3
0.5
1
3.0
+0.5
+0.5
+0.5
+1.0
MI
(Note 15)
MI
(Note 15)
MI
(Note 15)
MI
(Note 15)
MI
(Note 15)
MI
(Note 15)
MI
(Note 15)
MI
(Note 15)
MI
(Note 15)
MI
(Note 15)
MI
(Note 15)
MI
(Note 15)
5
FN7901.0
August 3, 2011
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