Quad, 256 Tap, Low Voltage Digitally Controlled
Potentiometer (XDCP™)
ISL23345
The ISL23345 is a volatile, low voltage, low noise, low power,
256 tap, quad digitally controlled potentiometer (DCP) with an
I
2
C 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
I
2
C 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 (128 tap
position).
The low voltage, low power consumption, and small package
of the ISL23345 make it an ideal choice for use in battery
operated equipment. In addition, the ISL23345 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 ISL23345 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
• 256 resistor taps
• 10kΩ, 50kΩ or 100kΩ total resistance
• I
2
C serial interface
- No additional level translator for low bus supply
- Three address pins allow up to eight devices per bus
• 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
• Power supply
- V
CC
= 1.7V to 5.5V analog power supply
- V
LOGIC
= 1.2V to 5.5V I
2
C bus/logic power supply
• Wiper resistance: 70Ω typical @ V
CC
= 3.3V
• Power-on preset to mid-scale (128 tap position)
• Extended industrial temperature range: -40
°
C to +125
°
C
• 20 Ld TSSOP or 20 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)
RH1
-
V
REF_M
6000
1 DCP
of
ISL23345
4000
RW1
+
ISL28114
2000
RL1
0
0
64
128
TAP POSITION (DECIMAL)
192
256
FIGURE 1. FORWARD AND BACKWARD RESISTANCE vs TAP
POSITION, 10kΩ DCP
FIGURE 2. V
REF
ADJUSTMENT
June 21, 2011
FN7872.0
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
Intersil (and design) and XDCP are trademarks owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners
ISL23345
Block Diagram
V
LOGIC
V
CC
RH0
WR0
VOLATILE
REGISTER
WR1
VOLATILE
REGISTER
WR2
VOLATILE
REGISTER
WR3
VOLATILE
REGISTER
SCL
SDA
A0
A1
A2
I/O
BLOCK
LEVEL
SHIFTER
RW0
RL0
RH1
RW1
RL1
RH2
RW2
RL2
RH3
RW3
RL3
POWER UP
INTERFACE
CONTROL
AND
STATUS
LOGIC
GND
Pin Configurations
ISL23345
(20 LD TSSOP)
TOP VIEW
RL0
RW0
V
CC
RH0
1
2
3
4
5
6
7
8
9
20
RL3
19
RW3
18
RH3
17
RL2
16
RW2
15 RH2
14 SCL
13
SDA
12
A2
11
A1
Pin Descriptions
TSSOP
1
2
3
4
5
6
7
8
9
10
QFN
19
20
1
2
3
4
5
6
7
8
SYMBOL
RL0
RW0
V
CC
RH0
RL1
RW1
RH1
GND
V
LOGIC
A0
DESCRIPTION
DCP0 “low” terminal
DCP0 wiper terminal
Analog power supply.
Range 1.7V to 5.5V
DCP0 “high” terminal
DCP1 “low” terminal
DCP1 wiper terminal
DCP1 “high” terminal
Ground pin
I
2
C bus /logic supply. Range 1.2V to 5.5V
Logic Pin - Hardwire slave address pin for
I
2
C serial bus.
Range: V
LOGIC
or GND
Logic Pin - Hardwire slave address pin for
I
2
C serial bus.
Range: V
LOGIC
or GND
Logic Pin - Hardwire slave address pin for
I
2
C serial bus.
Range: V
LOGIC
or GND
Logic Pin - Serial bus data input/open
drain output
Logic Pin - Serial bus clock input
DCP2 “high” terminal
DCP2 wiper terminal
DCP2 “low” terminal
DCP3 “high” terminal
DCP3 wiper terminal
DCP3 “low” terminal
RL1
RW1
RH1
GND
V
LOGIC
A0
10
ISL23345
(20 LD QFN)
TOP VIEW
RW0
RL0
RL3
RW3
11
9
A1
20
V
CC
RH0
19
18
17
6
16
15
14
13
12
11
RH3
RL2
RW2
RH2
SCL
12
10
A2
1
2
3
4
5
6
7
V
LOGIC
13
14
15
16
17
18
19
20
11
12
13
14
15
16
17
18
SDA
SCL
RH2
RW2
RL2
RH3
RW3
RL3
RL1
RW1
RH1
GND
SDA
8
A0
9
A1
10
A2
2
FN7872.0
June 21, 2011
ISL23345
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
ISL23345TFVZ
ISL23345UFVZ
ISL23345WFVZ
ISL23345TFRZ
ISL23345UFRZ
ISL23345WFRZ
NOTES:
1. Add “-TK” suffix for 1k unit or “-T7A” suffix for 250 unit Tape and Reel options. Please refer to
TB347
for details on reel specifications.
2. 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.
3. For Moisture Sensitivity Level (MSL), please see device information page for
ISL23345.
For more information on MSL please see techbrief
TB363.
PART MARKING
23345 TFVZ
23345 UFVZ
23325 WFVZ
345T
345U
345W
RESISTANCE
OPTION
(k
Ω
)
100
50
10
100
50
10
TEMP RANGE
(°C)
-40 to +125
-40 to +125
-40 to +125
-40 to +125
-40 to +125
-40 to +125
PACKAGE
(Pb-free)
20 Ld TSSOP
20 Ld TSSOP
20 Ld TSSOP
20 Ld 3x4 QFN
20 Ld 3x4 QFN
20 Ld 3x4 QFN
PKG.
DWG. #
MDP0044
MDP0044
MDP0044
L20.3x4
L20.3x4
L20.3x4
3
FN7872.0
June 21, 2011
ISL23345
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 IW (10s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±6mA
ESD Rating
Human Body Model (Tested per JESD22-A114E) . . . . . . . . . . . . . . . . 6kV
CDM Model (Tested per JESD22-A114E) . . . . . . . . . . . . . . . . . . . . . . . 1kV
Machine Model (Tested per JESD22-A115-A) . . . . . . . . . . . . . . . . . 300V
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)
20 Ld TSSOP Package (Notes 4, 6) . . . . . .
85
33
20 Ld QFN Package (Notes 5, 7) . . . . . . . .
40
4
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:
4.
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.
5.
θ
JA
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief
TB379.
6. For
θ
JC
, the “case temp” location is taken at the package top center.
7. For
θ
JC
, the “case temp” location is the center of the exposed metal pad on the package underside.
Analog Specifications
SYMBOL
R
TOTAL
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.
TEST CONDITIONS
W option
U option
T option
MIN
MAX
(Note 20) TYP (Note 8) (Note 20)
10
50
100
-20
W option
U option
T option
±2
125
65
45
0
70
580
32/32/32
-0.4
< 0.1
16
49
61
-65
-75
0.4
V
CC
200
+20
UNITS
kΩ
kΩ
kΩ
%
ppm/°C
ppm/°C
ppm/°C
V
Ω
Ω
pF
µA
nV Hz
nV Hz
nV Hz
dB
dB
PARAMETER
RH to RL Resistance
RH to RL Resistance Tolerance
End-to-End Temperature Coefficient
V
RH
, V
RL
RW
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
Leakage on DCP Pins
Resistor Noise Density
See “DCP Macro Model” on page 9
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
I
LkgDCP
Noise
Feed Thru
PSRR
Digital Feed-through from Bus to Wiper Wiper at middle point
Power Supply Reject Ratio
Wiper output change if V
CC
change ±10%;
wiper at middle point
4
FN7872.0
June 21, 2011
ISL23345
Analog Specifications
SYMBOL
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)
TEST CONDITIONS
MIN
MAX
(Note 20) TYP (Note 8) (Note 20)
UNITS
PARAMETER
VOLTAGE DIVIDER MODE (0V @ RL; V
CC
@ RH; measured at RW, unloaded)
INL
(Note 13)
Integral Non-linearity, Guaranteed
Monotonic
W option
U, T option
DNL
(Note 12)
Differential Non-linearity, Guaranteed
Monotonic
W option
U, T option
FSerror
(Note 11)
Full-scale Error
W option
U, T option
ZSerror
(Note 10)
Zero-scale Error
W option
U, T option
Vmatch
(Note 22)
TC
V
(Notes 14)
DCP to DCP Matching
DCPs at same tap position, same voltage at all
RH terminals, and same voltage at all RL
terminals
W option, Wiper Register set to 80 hex
U option, Wiper Register set to 80 hex
T option, Wiper Register set to 80 hex
t
LS_Settling
f
cutoff
Large Signal Wiper Settling Time
-3dB Cutoff Frequency
From code 0 to FF hex, measured from 0 to
1LSB settling of the wiper
Wiper at middle point W option
Wiper at middle point U option
Wiper at middle point T option
-1.0
-0.5
-1
-0.4
-5
-2
0
0
-2
±0.5
±0.15
±0.4
±0.1
-2
-0.5
2
0.4
±0.5
+1.0
+0.5
+1
+0.4
0
0
5
2
2
LSB
(Note 9)
LSB
(Note 9)
LSB
(Note 9)
LSB
(Note 9)
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
Ratiometric Temperature Coefficient
8
4
2.3
300
1200
250
120
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
-0.5
-1
-1.0
-2.0
±1
10.5
±0.3
2.1
±0.4
±0.6
±0.15
±0.35
+0.5
+1
+1.0
+2.0
MI
(Note 15)
MI
(Note 15)
MI
(Note 15)
MI
(Note 15)
MI
(Note 15)
MI
(Note 15)
MI
(Note 15)
MI
(Note 15)
5
FN7872.0
June 21, 2011
嵌入式系统
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