SUMMIT
MICROELECTRONICS, Inc.
SMP9317
Nonvolatile DACPOT™ Electronic Potentiometer
With Up/Down Counter Interface
FEATURES
• Digitally Controlled Electronic Potentiometer
• 7-Bit Digital-to-Analog Converter (DAC)
– Independent Reference Inputs
– Differential Non-Linearity - +0.5LSB
– Integral Non-Linearity - +1LSB
• V
OUT
Value in EEPROM for Power-On Recall
– Equivalent to 128-Step Potentiometer
• Unity Gain Op Amp Drives
±
100
µ
A
• Simple Trimming Adjustment
– Up/Down Counter Style Operation
• Low Noise Operation
• “Clickless” Transitions between DAC Steps
• No Mechanical Wearout Problem
– 1,000,000 Stores (typical)
– 100 Year Data Retention
• Operation from +2.7V to +5.5V Supply
• Ultra-Low Power, 0.5mW max at +5V
OVERVIEW
The SMP9317 DACPOT™ trimmer is a 7-bit nonvolatile
DAC designed to replace mechanical potentiometers.
The SMP9317 includes a unity-gain amplifier to buffer the
DAC output and enables V
OUT
to swing from rail to rail.
The DACPOT trimmer operates over a supply voltage
range of 2.7V to 5.5V.
The SMP9317’s simple up/down counter input provides
an ideal interface for automatic test equipment to dither
and monitor the V
OUT
voltage. This interface allows for
quick and consistent calibration of even the most sophis-
ticated systems.
The SMP9317 is a pin-compatible performance upgrade
for other industry nonvolatile potentiometers. The
SMP9317 offers higher resolution than these devices and
provides ‘clickless’ transitions of V
OUT
.
FUNCTIONAL BLOCK DIAGRAM
VDD
7-bit E2 PROM
VH
-
UP/DN
INC
CS
Counter
&
Write
Control
7-bit
Data
Register
AMP
7-bit DAC
+
VOUT
VL
GND
2031 ILL2.0
SUMMIT MICROELECTRONICS, Inc.
•
300 Orchard City Drive, Suite 131
•
Campbell, CA 95008
•
Telephone 408-378-6461
•
Fax 408-378-6586
•
www.summitmicro.com
© SUMMIT MICROELECTRONICS, Inc. 1998
2031-04 12/4/98
1
Characteristics subject to change without notice
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
