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PDF ISL23445 Data sheet ( Hoja de datos )
| Número de pieza | ISL23445 | |
| Descripción | Low Voltage Digitally Controlled Potentiometer | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Quad, 256 Tap, Low Voltage Digitally Controlled
Potentiometer (XDCP™)
ISL23445
The ISL23445 is a volatile, low voltage, low noise, low power, 256
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 (128 tap
position).
The low voltage, low power consumption, and small package
of the ISL23445 make it an ideal choice for use in battery
operated equipment. In addition, the ISL23445 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 ISL23445 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
• 256 resistor taps
• 10kΩ, 50kΩ or 100kΩ total resistance
• SPI serial interface
- No additional level translator for low bus supply
- Daisy Chaining of multiple DCPs
• Maximum supply current without serial bus activity
(standby)
- 5µA @ VCC and VLOGIC = 5V
- 2uA @ 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
• Power supply
- VCC = 1.7V to 5.5V analog power supply
- VLOGIC = 1.2V to 5.5V SPI bus/logic power supply
• Wiper resistance: 70Ω typical @ VCC = 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 Ld QFN packages
• Pb-free (RoHS compliant)
10000
8000
6000
4000
2000
0
0 64 128 192
TAP POSITION (DECIMAL)
FIGURE 1. FORWARD AND BACKWARD RESISTANCE vs TAP
POSITION, 10kΩ DCP
256
VREF
RH1
1 DCP
of
ISL23445
RW1
RL1
-
+
ISL28114
VREF_M
FIGURE 2. VREF ADJUSTMENT
June 21, 2011
FN7874.0
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
ISL23445
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 MAX
(Note 20) TYP (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
-1.0
±0.5
+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
-1 ±0.4 +1 LSB
(Note 9)
U, T option
-0.4
±0.1
+0.4
LSB
(Note 9)
FSerror Full-scale Error
(Note 11)
W option
-5 -2 0 LSB
(Note 9)
U, T option
-2 -0.5 0 LSB
(Note 9)
ZSerror Zero-scale Error
(Note 10)
W option
0 2 5 LSB
(Note 9)
U, T option
0 0.4 2 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 80 hex
U option, Wiper Register set to 80 hex
8 ppm/°C
4 ppm/°C
T option, Wiper Register set to 80 hex
2.3 ppm/°C
tLS_Settling Large Signal Wiper Settling Time
From code 0 to FF 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
-2.0
±1
+2.0
MI
(Note 15)
W option; VCC = 1.7V
10.5
MI
(Note 15)
U, T option; VCC = 2.7V to 5.5V
-1.0
±0.3
+1.0
MI
(Note 15)
U, T option; VCC = 1.7V
2.1 MI
(Note 15)
RDNL Differential Non-linearity, Guaranteed W option; VCC = 2.7V to 5.5V
(Note 17) Monotonic
-1 ±0.4 +1 MI
(Note 15)
W option; VCC = 1.7V
±0.6
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
±0.35
MI
(Note 15)
5 FN7874.0
June 21, 2011
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
ISL23445
Typical Performance Curves (Continued)
0.8 0.50
0.4 0.25
0.0 0.00
-0.4 -0.25
-0.8
0
64 128 192 256
TAP POSITION (DECIMAL)
FIGURE 9. 10kΩ RINL vs TAP POSITION, VCC = 3.3V, +25°C
-0.50
0
64 128 192
TAP POSITION (DECIMAL)
256
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 64 128 192 256
TAP POSITION (DECIMAL)
FIGURE 11. 10kΩ WIPER RESISTANCE vs TAP POSITION, VCC = 3.3V
120
+125°C
100 +25°C
80
60
40 -40°C
20
0
0 64 128 192 256
TAP POSITION (DECIMAL)
FIGURE 12. 50kΩ WIPER RESISTANCE vs TAP POSITION, VCC = 3.3V
400
300
200
100
0
15 63 111 159 207 255
TAP POSITION (DECIMAL)
FIGURE 13. 10kΩ TCv vs TAP POSITION, VCC = 3.3V
80
60
40
20
0
15 63 111 159 207 255
TAP POSITION (DECIMAL)
FIGURE 14. 50kΩ TCv vs TAP POSITION, VCC = 3.3V
11
FN7874.0
June 21, 2011
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ISL23445.PDF ] | |
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