MAX5160LEUA+ Maxim Integrated Products, MAX5160LEUA+ Datasheet - Page 5

• Manufacturer Part Number: MAX5160LEUA+
• Description: IC POT DGTL LO PWR 32 TAP 8-UMAX
• Manufacturer: Maxim Integrated Products

Specifications of MAX5160LEUA+

• Taps: 32
• Resistance (ohms): 50K
• Number Of Circuits: 1
• Temperature Coefficient: 50 ppm/°C Typical
• Memory Type: Volatile
• Interface: 3-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Resistance In Ohms: 50K
• Number Of Pots: Single
• Taps Per Pot: 32
• Resistance: 400 Ohms
• Wiper Memory: Volatile
• Digital Interface: Serial (3-Wire)
• Operating Supply Voltage: 2.7 V to 5.5 V
• Supply Current: 10 uA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Description/function: Low-Power, 32-Tap Digital Potentiometer in 8-Pin æMAX
• Mounting Style: SMD/SMT
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Tolerance: 25 %
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX5160/MAX5161 consist of resistor arrays with
thirty-one resistive elements. Thirty-two tap points are
accessible to the wiper along the resistor string
between H and L. Logic inputs CS, U/D, and INC
determine the position 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, decreas-
ing the resistance between W and L. At either end
(maximum or minimum 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
Figure 1. Adjustable Positive LCD Bias
0.1µF
V
68µF
V
REF
IN
C3
C1
= 5V
= 1.5V
5
4
6
REF
SHDN
AGND
C2
0.1µF
MAX1771
GND
V+
_______________________________________________________________________________________
2
7
Detailed Description
EXT
CS
FB
MAX5161
1
8
3
V
V
22µH
OUT(MAX)
OUT(MIN)
V
V
REF
REF
L1
Low-Power Digital Potentiometers
MTD20N03HDL
N
1N5817-22
R
40mΩ
R1
SENSE
=
=
R1
R2
(
D1
R1 + R
+ 1
R
300µF
VAR
VAR(MAX)
R2
C4
C5
R2
V
)
OUT
AT 0.5A
+ 1
= 12V
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.
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.
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.
Figure 2. Adjustable Negative LCD Bias
150µF
V
IN
C1
V
V
R1 + R
OUT(MAX)
REF
V
REF
MAX5161
- V
VAR
FB
C2
0.1µF
=
≥ 5µA (FOR 2% GAIN-SETTING ACCURACY)
R2
R1
R2
R1
Applications Information
,
V
OUT(MIN)
C3
0.1µF
R
V
VAR
REF
1
3
2
4
Controlling a Switch-Mode
OUT
SHDN
FB
REF
=
R1 + R
MAX774
MAX775
MAX776
R2
GND
VAR
8
LCD Bias Generator
*
MAX775, MAX776 = 120µF, 20V
MAX774 = 330µF, 10V
EXT
CS
V+
5
6
7
22µH
L1
P
Q1
Si9435
R3
0.07Ω
1N5822/
MBR340
C4
*
V
OUT
5