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PDF ISL23428 Data sheet ( Hoja de datos )
| Número de pieza | ISL23428 | |
| Descripción | Low Voltage Digitally Controlled Potentiometer | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Dual, 128-Tap, Low Voltage Digitally Controlled
Potentiometer (XDCP™)
ISL23428
The ISL23428 is a volatile, low voltage, low noise, low power,
128-tap, dual digitally controlled potentiometer (DCP) with an
SPI Bus™ interface. It integrates two 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) 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 ISL23428 make it an ideal choice for use in battery
operated equipment. In addition, the ISL23428 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 ISL23428 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
• Two potentiometers per package
• 128 resistor taps
• 10k 50kor 100k 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)
- 4µA @ VCC and VLOGIC = 5V
- 1.7µA @ 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: 70 typical @ VCC = 3.3V
• Power-on preset to mid-scale (64 tap position)
• Extended industrial temperature range: -40°C to +125°C
• 14 Ld TSSOP or 16 Ld UTQFN 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, 10kΩ DCP
VREF
RH
ISL23428
RW
RL
-
+
ISL28114
VREF_M
FIGURE 2. VREF ADJUSTMENT
August 25, 2011
FN7904.0
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
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
ISL23428
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 19)
TYP
(Note 7)
MAX
(Note 19)
UNITS
VOLTAGE DIVIDER MODE (0V @ RL; VCC @ RH; measured at RW, unloaded)
INL Integral Non-linearity, Guaranteed
(Note 12) Monotonic
W option
-0.5
±0.15
+0.5
LSB
(Note 8)
U, T option
-0.5
±0.15
+0.5
LSB
(Note 8)
DNL Differential Non-linearity, Guaranteed W option
(Note 11) Monotonic
-0.5
±0.15
+0.5
LSB
(Note 8)
U, T option
-0.5
±0.15
+0.5
LSB
(Note 8)
FSerror Full-scale Error
(Note 10)
W option
-3 -1.5 0 LSB
(Note 8)
U, T option
-1.5 -0.9
0 LSB
(Note 8)
ZSerror Zero-scale Error
(Note 9)
W option
0 1.5 3 LSB
(Note 8)
U, T option
0 0.9 1.5 LSB
(Note 8)
Vmatch DCP to DCP Matching
(Note 21)
DCPs at same tap position, same voltage
at all RH terminals, and same voltage at
all RL terminals
-2
±0.5
2 LSB
(Note 8)
TCV Ratiometric Temperature Coefficient
(Note 13)
W option, Wiper Register set to 40 hex
U option, Wiper Register set to 40 hex
8 ppm/°C
4 ppm/°C
T option, Wiper Register set to 40 hex
2.3 ppm/°C
tLS_Settling Large Signal Wiper Settling Time
From code 0 to 7F hex, measured from 0
to 1 LSB settling of the wiper
300
ns
fcutoff -3dB Cutoff Frequency
Wiper at middle point W option
Wiper at middle point U option
1200
250
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 17) Monotonic
W option; VCC = 2.7V to 5.5V
-1.0
±0.5
+1.0
MI
(Note 14)
W option; VCC = 1.7V
4 MI
(Note 14)
U, T option; VCC = 2.7V to 5.5V
-0.5
±0.15
+0.5
MI
(Note 14)
U, T option; VCC = 1.7V
1 MI
(Note 14)
RDNL Differential Non-Linearity, Guaranteed W option; VCC = 2.7V to 5.5V
(Note 16) Monotonic
-0.5
±0.15
+0.5
MI
(Note 14)
W option; VCC = 1.7V
±0.4
MI
(Note 14)
U, T option; VCC = 2.7V to 5.5V
-0.5
±0.15
+0.5
MI
(Note 14)
U, T option; VCC = 1.7V
±0.4
MI
(Note 14)
5 FN7904.0
August 25, 2011
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
ISL23428
Typical Performance Curves (Continued)
0.30
0.08
0.15
0.04
0.00
0.00
-0.15
-0.04
-0.30
0
32 64 96
TAP POSITION (DECIMAL)
128
FIGURE 9. 10kΩ RINL vs TAP POSITION, VCC = 3.3V, +25°C
-0.08 0
32 64 96
TAP POSITION (DECIMAL)
128
FIGURE 10. 50kΩ RINL vs TAP POSITION, VCC = 3.3V, +25°C
100
+125°C
80 +25°C
60
40 -40°C
20
120
100
+25°C
+125°C
80
60
-40°C
40
20
0
0 32 64 96 128
TAP POSITION (DECIMAL)
FIGURE 11. 10kΩ WIPER RESISTANCE vs TAP POSITION, VCC = 3.3V
0
0 32 64 96 128
TAP POSITION (DECIMAL)
FIGURE 12. 50kΩ WIPER RESISTANCE vs TAP POSITION, VCC = 3.3V
200
150
100
50
0
15 43 71 99
TAP POSITION (DECIMAL)
FIGURE 13. 10kΩ TCv vs TAP POSITION, VCC = 3.3V
127
11
40
30
20
10
0
15 43 71 99
TAP POSITION (DECIMAL)
FIGURE 14. 50kΩ TCv vs TAP POSITION, VCC = 3.3V
127
FN7904.0
August 25, 2011
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet ISL23428.PDF ] | |
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