ISL23445 Intersil Corporation, ISL23445 Datasheet - Page 13

• Manufacturer Part Number: ISL23445
• Description: Low Voltage Digitally Controlled Potentiometer
• Manufacturer: Intersil Corporation

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Typical Performance Curves
Functional Pin Descriptions
Potentiometers Pins
RH
The high (RHi, i = 0, 1, 2, 3) and low (RLi, i = 0, 1, 2, 3) terminals
of the ISL23445 are equivalent to the fixed terminals of a
mechanical potentiometer. RHi and RLi are referenced to the
relative position of the wiper and not the voltage potential on the
terminals. With WRi set to 255 decimal, the wiper will be closest
to RHi, and with the WRi set to 0, the wiper is closest to RLi.
RW
RWi (i = 0, 1, 2, 3) is the wiper terminal, and it is equivalent to the
movable terminal of a mechanical potentiometer. The position of
the wiper within the array is determined by the WRi register.
1V/DIV
0.2µs/DIV
I
0.5V/DIV, 0.2µs/DIV
-3dB FREQUENCY = 1.437MHz AT MIDDLE TAP
I
AND RL
FIGURE 21. WIPER LARGE SIGNAL SETTLING TIME
FIGURE 23. 10kΩ -3dB CUT OFF FREQUENCY
CH1: RH TERMINAL
CH2: RW TERMINAL
I
13
WIPER
CS
(Continued)
ISL23445
Power Pins
V
Power terminal for the potentiometer section analog power
source. Can be any value needed to support the voltage range of
the DCP pins, from 1.7V to 5.5V, independent of the V
voltage.
Bus Interface Pins
SERIAL CLOCK (SCK)
This input is the serial clock of the SPI serial interface.
SERIAL DATA INPUT (SDI)
The SDI is a serial data input pin for SPI interface. It receives
operation code, wiper address and data from the SPI remote
host device. The data bits are shifted in at the rising edge of the
serial clock SCK, while the CS input is low.
CC
FIGURE 22. POWER-ON START-UP IN VOLTAGE DIVIDER MODE
0.5V/DIV
20µs/DIV
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
-40
FIGURE 24. STANDBY CURRENT vs TEMPERATURE
-15
V
CC
10
= 5.5V, V
TEMPERATURE (°C)
LOGIC
35
V
CC
= 5.5V
= 1.7V, V
60
LOGIC
85
WIPER
V
CC
= 1.2V
LOGIC
June 21, 2011
110
FN7874.0
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