MAX5481 MAXIM [Maxim Integrated Products], MAX5481 Datasheet - Page 12

• Manufacturer Part Number: MAX5481
• Description: 10-Bit, Nonvolatile, Linear-Taper Digital Potentiometers
• Manufacturer: MAXIM [Maxim Integrated Products]

The MAX5481/MAX5482 linear programmable voltage-
dividers and the MAX5483/MAX5484 variable resistors
feature 1024 tap points (10-bit resolution) (see the
Functional Diagrams). These devices consist of multi-
ple strings of equal resistor segments with a wiper con-
tact that moves among the 1024 points through a
pin-selectable 3-wire SPI-compatible serial interface or
up/down interface. The MAX5481/MAX5483 provide a
total end-to-end resistance of 10kΩ, and the
MAX5482/MAX5484 have an end-to-end resistance of
50kΩ. The MAX5481/MAX5482 allow access to the
high, low, and wiper terminals for a standard voltage-
divider configuration.
10-Bit, Nonvolatile, Linear-Taper Digital
Potentiometers
12
______________________________________________________________________________________
SCLK(INC)
DIN(U/D)
GND
CS
V
V
DD
SS
Detailed Description
INTERFACE
INTERFACE
UP/DOWN
SPI
MEMORY
10-BIT
NV
POR
10-BIT
LATCH
MUX
The MAX5481/MAX5482 programmable voltage-
dividers provide a weighted average of the voltage
between the H and L inputs at the W output. Both
devices feature 10-bit resolution and provide up to
1024 tap points between the H and L voltages. Ideally,
the V
data bits are zero and the V
wiper terminal when all data bits are one. The step size
(1 LSB) voltage is equal to the voltage applied across
terminals H and L divided by 2
voltage V
Functional Diagrams (continued)
10
V
L
W
voltage occurs at the wiper terminal (W) when all
( ) =
D
DECODER
W
MAX5481/MAX5482 Programmable
as follows:
D





MAX5483
MAX5484
V
HL
10
−
(

V
FSE
1023
 
+
V
H
ZSE
10
voltage occurs at the
Voltage-Dividers
. Calculate the wiper

)





+
H
L
V
SPI/UD
L
+

V
ZSE
