MAX5427 Просмотр технического описания (PDF) - Maxim Integrated
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MAX5427 Datasheet PDF : 10 Pages
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One-Time Programmable, Linear-Taper
Digital Potentiometers
Typical Operating Characteristics (continued)
(VDD = 5.0V, TA = +25°C, unless otherwise noted.)
0.10
0.08
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
0
R-INL ERROR vs. INPUT CODE
(MAX5428)
5 10 15 20 25 30
INPUT CODE (DECIMAL)
0.025
0.020
0.015
0.010
0.005
0
-0.005
-0.010
-0.015
-0.020
-0.025
0
R-DNL ERROR vs. INPUT CODE
(MAX5429)
5 10 15 20 25 30
INPUT CODE (DECIMAL)
0.10
0.08
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
0
R-INL ERROR vs. INPUT CODE
(MAX5429)
5 10 15 20 25 30
INPUT CODE (DECIMAL)
Pin Description
PIN
NAME
FUNCTION
1
W
Wiper Connection
Chip-Select Input. A high-to-low CS transition determines the mode: increment if U/D is high, or
2
CS
decrement if U/D is low. CS is also used for one-time programming (see the One-Time Programming
section).
3
VDD
Power-Supply Voltage
4
GND
Ground
5
VPP
Programming Voltage for One-Time Programming. Connect VPP to 10V supply when one-time
programming the device. For normal operation, connect to ground or let float.
6
U/D
Up/Down Control Input. With CS low, a low-to-high transition increments or decrements the wiper
position.
7
L
Low Terminal of Resistor
8
H
High Terminal of Resistor
Detailed Description
The MAX5427/MAX5428/MAX5429 are 100kΩ/50kΩ/
10kΩ (end-to-end resistance) digitally controlled poten-
tiometers. They have 32 tap positions that are accessible
to the wiper along the resistor array between H and L.
The wiper (W) position is adjusted sequentially through
the tap positions using a simple 2-wire interface. These
digital potentiometers have an optional one-time pro-
grammable feature that sets the POR position of the
wiper. The 2-wire interface can then be disabled, perma-
nently preventing unwanted adjustment.
Digital Interface Operation
The MAX5427/MAX5428/MAX5429 have two modes of
operation when the serial interface is active: increment
mode and decrement mode. The serial interface is only
active when CS is low.
The CS and U/D inputs control the position of the wiper
along the resistor array. When CS transitions from high
to low, the part goes into increment mode if U/D is high
(Figure 2), and into decrement mode if U/D is low
(Figure 3). Once the mode is set, the device remains in
that mode until CS goes high. A low-to-high transition at
the U/D increments or decrements the wiper position
depending on the current mode.
When the CS input transitions to high (when serial inter-
face is inactive) and U/D is low, the wiper increments or
decrements one position in accordance with the state
of U/D when CS went low. If U/D is high when CS tran-
sitions to high, the wiper remains in the same position.
_______________________________________________________________________________________ 5
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