MAX5405EUB Maxim Integrated Products, MAX5405EUB Datasheet - Page 7

• Manufacturer Part Number: MAX5405EUB
• Description: IC POT DUAL DGTL 256TAP 10-UMAX
• Manufacturer: Maxim Integrated Products

Specifications of MAX5405EUB

• Taps: 256
• Resistance (ohms): 100K
• Number Of Circuits: 2
• Temperature Coefficient: 35 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: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Resistance In Ohms: 100K
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Figure 1. MAX5403/MAX5404/MAX5405 Functional Diagram: 2-Terminal Variable Resistor and 3-Terminal Potentiometers in 10-µMAX
Configuration
Each potentiometer consists of 255 fixed resistors in
series between pins H
potentiometer and between W
nal variable resistor
(pin W
256 different tap points on the resistor string. The
MAX5403/MAX5404/MAX5405 require nine bits to pro-
gram the wiper position. The 1st bit is an address code,
PIN
X
10
1
2
3
4
5
6
7
8
9
) can be programmed to access any one of the
_______________________________________________________________________________________
(Figure 1). The potentiometer wiper
NAME
SCLK
GND
V
DIN
W
W
H
CS
L
L
Detailed Description
SCLK
DD
GND
B
A
B
V
B
A
DIN
CS
DD
B
and L
A
Digital Potentiometers in 10-µMAX
REGISTER
DECODE
and L
Ground
Low Terminal of Resistor B
High Terminal of Resistor B
Wiper Terminal of Resistor B
SPI Chip Select
SPI Serial Data Input
SPI Clock Input
Power Supply, +2.7V to +5.5V. Connect a 0.1 F capacitor to GND.
Wiper Terminal of Resistor A
Low Terminal of Resistor A
SHIFT
9-BIT
B
SR
R
for the 3-terminal
A
for the 2-termi-
8
POR
LATCH
LATCH
8-BIT
8-BIT
R
R
8
8
Dual 256-Tap, Low-Drift,
allowing one or the other potentiometers to be selected
for programming. The potentiometers are programmed
independently of each other.
The MAX5403/MAX5404/MAX5405 use a 3-wire serial
data interface to control the wiper tap position. This
write-only interface contains three inputs: Chip Select
(CS), Data In (DIN), and Data Clock (SCLK). When CS
is taken low, data from the DIN pin is synchronously
loaded into the serial shift register on each rising edge
DECODE
DECODE
256
256
FUNCTION
MAX5403
MAX5404
MAX5405
W
L
H
W
L
A
B
B
A
B
Pin Description
7