MAX5474EKA+T Maxim Integrated Products, MAX5474EKA+T Datasheet - Page 8

• Manufacturer Part Number: MAX5474EKA+T
• Description: IC POT DGTL 32-TAP NV SOT23-8
• Manufacturer: Maxim Integrated Products

Specifications of MAX5474EKA+T

• Taps: 32
• Resistance (ohms): 50K
• Number Of Circuits: 1
• Temperature Coefficient: 35 ppm/°C Typical
• Memory Type: Non-Volatile
• Interface: Up/Down
• Voltage - Supply: 2.7 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-8
• Resistance In Ohms: 50K
• Number Of Pots: Single
• Taps Per Pot: 32
• Resistance: 50 KOhms
• Wiper Memory: Non Volatile
• Digital Interface: Serial (3-Wire)
• Operating Supply Voltage: 5 V
• Supply Current: 0.4 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Description/function: 32-Step Nonvolatile Up/Down 50Kohm Potentiometer
• Mounting Style: SMD/SMT
• Supply Voltage (max): 5.25 V
• Supply Voltage (min): 2.7 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MAX5474EKA+T

The MAX5471/MAX5472/MAX5474/MAX5475 are
always in standby mode, except during the transition of
a logic input or while the wiper position is being stored.
When in standby mode, the static supply current is
reduced to less than 1µA and the resistive terminals (H,
W, and L) are unaffected.
32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
↓ = High-to-low transition.
↑ = Low-to-high transition.
X = Don’t care.
Figure 2. MAX5471/MAX5472 Functional Diagram
8
GND
V
U/D
INC
CS
DD
_______________________________________________________________________________________
CS
H
L
L
L
↓
↑
↑
6
2
1
4
3
NONVOLATILE
UP/DOWN
COUNTER
MEMORY
U/D
MAX5471
MAX5472
H
L
X
X
X
X
X
32-POSITION
DECODER
INC
H
↓
↓
↑
X
X
L
R
R
R
R
31
30
2
1
H
5
Position not stored
Standby Mode
Position stored
S
S
S
S
S
S
32
31
30
Decrement
No change
No change
No change
3
2
1
Increment
Truth Table
W
R
W
The MAX5471/MAX5472/MAX5474/MAX5475 are
intended for circuits requiring digitally controlled
adjustable resistance, such as LCD contrast control
(where voltage biasing adjusts the display contrast), or
programmable filters with adjustable gain and/or cutoff
frequency.
Figures 4 and 5 show an application where the voltage-
divider or variable resistor is used to make an
adjustable, positive LCD-bias voltage. The op amp pro-
vides buffering and gain to the resistor-divider network
made by the potentiometer (Figure 4) or to a fixed
resistor and a variable resistor (Figure 5).
Figure 6 shows the configuration of a 1st-order pro-
grammable filter. The gain of the filter is adjusted by
R2, and the cutoff frequency is adjusted by R3. Use the
following equations to calculate the gain (G) and the
3dB cutoff frequency (f
Figure 3. MAX5474/MAX5475 Functional Diagram
GND
V
U/D
INC
CS
DD
2
3
1
5
4
NONVOLATILE
UP/DOWN
COUNTER
MEMORY
MAX5474
MAX5475
Applications Information
f
C
32-POSITION
=
Positive LCD Bias Control
DECODER
G
C
):
2
= +
π
1
×
Programmable Filter
R
1
R
R
R
R
R
31
30
R
3
2
1
1
2
×
H
L
6
8
C
S
S
S
S
S
S
32
31
30
3
2
1
R
W
7
W