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PDF MAX5161 Data sheet ( Hoja de datos )
| Número de pieza | MAX5161 | |
| Descripción | Low-Power Digital Potentiometers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX5161 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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19-1435; Rev 1; 4/99
Low-Power Digital Potentiometers
General Description
The MAX5160/MAX5161 linear-taper digital potentiome-
ters perform the same function as a mechanical poten-
tiometer or a variable resistor. They consist of a fixed
resistor and a wiper contact with 32 tap points that are
digitally controlled by three lines for the 8-pin MAX5160
or by two lines for the 6-pin MAX5161.
These parts are ideal for applications requiring digitally
controlled resistors. Three resistance values are avail-
able for each part type: 50kΩ, 100kΩ, and 200kΩ. A
nominal resistor temperature coefficient of 50ppm/°C
end-to-end and only 5ppm/°C ratiometric makes the
MAX5160 ideal for applications requiring a low-temper-
ature-coefficient variable resistor, such as low-tempco,
adjustable-gain circuit configurations.
The MAX5160 is available in an 8-pin µMAX package,
and the MAX5161 is available in a 6-pin SOT23 pack-
age. Both devices are guaranteed over the extended-
industrial temperature range (-40°C to +85°C).
Applications
LCD Screen Adjustment
Volume Control
Mechanical Potentiometer Replacement
Functional Diagram
VDD
GND MAX5160
MAX5161
H
CS
INC
UP/DN
COUNTER
POSITION
DECODER
U/D
W
L
Features
o 32 Tap Positions
o 50kΩ, 100kΩ, and 200kΩ Resistance Values
o 400Ω Wiper Resistance
o ±25% Resistance Tolerance
o 3-Wire Serial Data Input
o ±1LSB DNL
o ±0.5LSB INL
o 100nA Supply Current
o Single-Supply Operation: +2.7V to +5.5V
o Power-On Reset: Wiper Goes to Midscale
(position 16)
o ±2kV ESD Protection
o Small-Footprint Packages
6-Pin SOT23 (MAX5161)
8-Pin µMAX (MAX5160)
o Glitchless Switching Between the Resistor Taps
Ordering Information
PART
MAX5160NEUA
MAX5160MEUA
MAX5160LEUA
MAX5161NEUT
MAX5161MEUT
MAX5161LEUT
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
8 µMAX
8 µMAX
8 µMAX
6 SOT23-6
6 SOT23-6
6 SOT23-6
R
(kΩ)
200
100
50
200
100
50
TOP VIEW
Pin Configurations
INC 1
U/D 2
H3
GND 4
MAX5160
µMAX
L1
8 VDD
7 CS
6L
H2
5W
GND 3
MAX5161
6 VDD
5 INC
4 U/D
SOT23-6
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
Low-Power Digital Potentiometers
Detailed Description
The MAX5160/MAX5161 consist of resistor arrays with
31 resistive elements. Thirty-two tap points are accessi-
ble to the wiper along the resistor string between H and
L. Logic inputs CS, U/D, and INC determine the posi-
tion of the wiper. With CS low and U/D high, a high-to-
low transition on INC increments the internal counter,
increasing the resistance between W and L. When both
CS and U/D are low, a high-to-low INC transition
decrements the internal counter, decreasing the resis-
tance between W and L. At either end (maximum or mini-
mum positions), additional transitions in the direction of
the end points will not change the counter value (the
counter will not wrap around).
The H and L terminals of the MAX5160 are similar to the
two end terminals of a mechanical potentiometer. The
tap W is equivalent to the variable tap (wiper) of the
potentiometer.
The MAX5161 is similar to the MAX5160 except that CS
internally connects to ground and the wiper terminal (W)
is shorted to the high terminal (H). The MAX5161 acts as
a variable resistor (a potentiometer with the wiper and
one end terminal shorted together).
The MAX5160/MAX5161 feature power-on reset circuit-
ry that sets the wiper position to midscale at power-up.
Applications Information
The MAX5160/MAX5161 are intended for circuits
requiring digitally controlled adjustable voltage or
adjustable gain, such as LCD contrast control, where
voltage biasing adjusts the display contrast.
Controlling a Switch-Mode
LCD Bias Generator
Figure 1 shows an application where the MAX5161 is
used with a MAX1771 to make an adjustable positive
LCD-bias circuit. The output of the MAX1771 is a posi-
tive voltage that is digitally controlled through the
MAX5160/MAX5161. Similarly, Figure 2 shows the
application of the MAX5161 in a digitally controlled
negative LCD-bias circuit along with the MAX774/
MAX775/MAX776.
VIN = 5V
C1
68µF
C3
0.1µF
C2
0.1µF
2
5 REF
V+
L1
22µH
D1
1N5817-22
4
MAX1771
SHDN
EXT
1
6 AGND
8
CS
FB 3
GND
C4
N 300µF
MTD20N03HDL
RSENSE
40mΩ
R2
7
MAX5161
C5
RVAR
VOUT = 12V
AT 0.5A
R1
VREF = 1.5V
VOUT(MAX) = R2 + 1
VREF R1
( )VOUT(MIN) = R2 + 1
VREF R1 + RVAR(MAX)
VIN
C1
150µF
C2
0.1µF
R2
MAX5161
R1
1 OUT
V+ 5
3 SHDN MAX774
2
MAX775 CS 6
MAX776 7
FB EXT
RVAR
R3
0.07Ω
Q1
Si9435
P
VOUT
4 REF
C3
0.1µF
GND
8
L1
22µH
1N5822/
MBR340
C4*
* MAX774 = 330µF, 10V
MAX775, MAX776 = 120µF, 20V
VOUT(MAX) = R2 , VOUT(MIN) = R2
VREF R1 VREF R1 + RVAR
VREF - VFB 5µA (FOR 2% GAIN-SETTING ACCURACY)
R1 + RVAR
Figure 1. Adjustable Positive LCD Bias
Figure 2. Adjustable Negative LCD Bias
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX5161.PDF ] | |
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