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PDF ISL23448 Data sheet ( Hoja de datos )
| Número de pieza | ISL23448 | |
| Descripción | Low Voltage Digitally Controlled Potentiometer | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Quad, 128 Tap, Low Voltage Digitally Controlled
Potentiometer (XDCP™)
ISL23448
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
• 10kΩ, 50kΩ or 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
VREF
6000
4000
2000
0
0 32 64 96 128
TAP POSITION (DECIMAL)
FIGURE 1. FORWARD AND BACKWARD RESISTANCE vs TAP
POSITION, 10kΩ DCP
RH1
1 DCP
OF
ISL23448
RW1
RL1
-
+
ISL28114
VREF_M
FIGURE 2. VREF ADJUSTMENT
August 19, 2011
FN7905.0
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
ISL23448
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 TYP MAX
(Note 20) (Note 8) (Note 20) UNITS
VOLTAGE DIVIDER MODE (0V @ RL; VCC @ RH; measured at RW, unloaded)
INL Integral Non-linearity, Guaranteed
(Note 13) Monotonic
W option
-0.5
±0.15
+1.0
LSB
(Note 9)
U, T option
-0.5
±0.15
+0.5
LSB
(Note 9)
DNL Differential Non-linearity, Guaranteed W option
(Note 12) Monotonic
-0.5
±0.15
+0.5
LSB
(Note 9)
U, T option
-0.5
±0.15
+0.5
LSB
(Note 9)
FSerror Full-scale Error
(Note 11)
W option
-3 -1.5 0 LSB
(Note 9)
U, T option
-1.5 -0.9
0 LSB
(Note 9)
ZSerror Zero-scale Error
(Note 10)
W option
0 1.5 3 LSB
(Note 9)
U, T option
0 0.9 1.5 LSB
(Note 9)
Vmatch DCP to DCP Matching
(Note 22)
DCPs at same tap position, same voltage at all RH
terminals, and same voltage at all RL terminals
-2
±0.5
2 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 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 1LSB
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 18) Monotonic
W option; VCC = 2.7V to 5.5V
-1.0
±0.5
+1.0
MI
(Note 15)
W option; VCC = 1.7V
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
1 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)
5 FN7905.0
August 19, 2011
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
ISL23448
Typical Performance Curves (Continued)
0.4
0.3
0.2
0.1
0.0
0 32 64 96 128
TAP POSITION (DECIMAL)
FIGURE 9. 10kΩ RINL vs TAP POSITION, VCC = 3.3V, +25°C
0.08
0.04
0.00
-0.04
-0.08 0
32 64 96 128
TAP POSITION (DECIMAL)
FIGURE 10. 50kΩ RINL vs TAP POSITION, VCC = 3.3V, +25°C
100
+25°C
+125°C
80
60
40
-40°C
20
0
0 32 64 96 128
TAP POSITION (DECIMAL)
FIGURE 11. 10kΩ WIPER RESISTANCE vs TAP POSITION, VCC = 3.3V
120
+25°C
+125°C
100
80
60
40 -40°C
20
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
FN7905.0
August 19, 2011
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet ISL23448.PDF ] | |
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