AS1506_1 Datasheet, PDF (1/17 Pages) ams AG – 256-Tap Digital Potentiometer with SPI Interface and High Endurance EEPROM

Datasheet
AS1506
256-Tap Digital Potentiometer with SPI Interface and
High Endurance EEPROM
1 General Description
2 Key Features
The AS1506 is a linear, 256-tap digital potentiometer
specifically designed to replace discrete/mechanical
potentiometers and is ideal for applications requiring a
low-temperature-coefficient variable resistor, such as
low-drift, programmable gain, and amplifier circuit con-
figurations.
The device is controlled via a 3-wire SPI-compatible
interface and features an internal EEPROM for storing
wiper positions.
Several device variants are available differentiated by
end-to-end resistance as shown in Table 1 (see also
Ordering Information on page 16).
Table 1. Standard Products
Model
End-to-End Resistance (kΩ)
AS1506-10
10
AS1506-50
50
AS1506-100
100
The 3-wire SPI-compatible serial interface allows com-
munication at data rates up to 5MHz.The internal
EEPROM stores the last wiper position for initialization
during power-up and a low-power standby mode.
The devices are available in an 8-pin TDFN 3x3mm
package.
! High Endurance: EEPROM up to 10M cycles
! High Reliability: EEPROM up to 150 years data
retention @ 85°C
! Wiper Position Retained in EEPROM and loaded at
Power-Up
! 256 Tap Positions
! ±0.5LSB DNL in Voltage Divider Mode
! ±0.5LSB INL in Voltage Divider Mode
! End-to-End Resistance: 10/50/100kΩ
! Low End-to-End Resistance Temperature
Coefficient: 90ppm/ºC
! Low-Power Standby Mode: 100nA
! 5MHz SPI-Compatible Serial Interface
! Single-Supply Operation: +2.7V to +5.5V
! 8-pin TDFN 3x3mm Package
3 Applications
The device is ideal for mechanical potentiometer
replacement, low-drift programmable gain amplifiers,
audio volume control, LCD contrast control, and low-drift
programmable filters.
Figure 1. AS1506 - Block Diagram
1
VDD
8
8-Bit
Shift Register
8
8-Bit
Latch
2
SCLK
3
SDIO
4
CSN
SPI
Interface
Power-
On
Reset
8-Bit
EEPROM
256
256-Position
Decoder
AS1506
8
HIGH
7
WIPER
6
LOW
5
GND
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