AS1507
D u a l 2 5 6 - Ta p D i g i ta l P o t e n t i o m e t e r w i t h S P I I n t e r f a c e
and High Endurance EEPROM
D a ta S he e t
1 General Description
The AS1507 is a linear, dual 256-tap digital potentiome-
ter specifically designed to replace discrete/mechanical
potentiometers and is ideal for applications requiring a
low-temperature-coefficient variable resistor.
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
(see also
Table 1. Standard Products
Model
AS1507-10
AS1507-50
AS1507-100
End-to-End Resistance (kΩ)
10
50
100
2 Key Features
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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: +2.7 to +5.5V
TQFN 3x3mm 16-pin Package
!
!
!
!
!
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!
!
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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.
The devices are available in an TQFN 3x3mm 16-pin
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. Block Diagram
9
1
V
DD
8-Bit
Latch
8
256-Position
Decoder
SPI
Interface
25
READY
15
HIGH A
14
WIPER
13
LOW A
12
HIGH B
256-Position
Decoder
8-Bit
Latch
7
GND
8
25
11
WIPER
10
16
MUTE
2
SCLK
3
SDIO
4
CSN
Power-
On
Reset
16-Bit
EEPROM
AS1507
LOW B
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