End-to-end resistance: 2.5 k鈩? 10 k鈩? 50 k鈩? 100 k鈩?/div>
Compact MSOP-10 (3 mm 脳 4.9 mm) package
Fast settling time: t
S
= 5 碌s typ in power-up
Full read/write of wiper register
Power-on preset to midscale
Extra package address decode pins AD0 and AD1 (AD5173)
Single supply 2.7 V to 5.5 V
Low temperature coefficient: 35 ppm/擄C
Low power, I
DD
= 6 碌A(chǔ) max
Wide operating temperature: 鈥?0擄C to +125擄C
Evaluation board and software are available
Software replaces 碌C in factory programming applications
FUNCTIONAL BLOCK DIAGRAMS
A1
W1
B1
A2
W2
B2
V
DD
1
GND
RDAC
REGISTER 1
FUSE
LINKS
2
RDAC
REGISTER 2
/
8
SDA
SCL
SERIAL INPUT
REGISTER
04103-0-001
Figure 1. AD5172
W1
B1
W2
B2
APPLICATIONS
Systems calibration
Electronics level setting
Mechanical Trimmers廬 replacement in new designs
Permanent factory PCB setting
Transducer adjustment of pressure, temperature, position,
chemical, and optical sensors
RF amplifier biasing
Automotive electronics adjustment
Gain control and offset adjustment
V
DD
1
GND
RDAC
REGISTER 1
FUSE
LINKS
2
RDAC
REGISTER 2
AD0
AD1
SDA
SCL
ADDRESS
DECODE
/
8
SERIAL INPUT
REGISTER
04103-0-002
GENERAL OVERVIEW
The AD5172/AD5173 are dual channel, 256-position, one-time
programmable (OTP) digital potentiometers
1
that employ fuse
link technology to achieve memory retention of resistance
setting. OTP is a cost-effective alternative to EEMEM for users
who do not need to program the digital potentiometer setting in
memory more than once. This device performs the same elec-
tronic adjustment function as mechanical potentiometers or
variable resistors with enhanced resolution, solid-state reliabil-
ity, and superior low temperature coefficient performance.
The AD5172/AD5173 are programmed using a 2-wire, I
2
C
compatible digital interface. Unlimited adjustments are allowed
before permanently setting the resistance value. During OTP
activation, a permanent blow fuse command freezes the wiper
position (analogous to placing epoxy on a mechanical trimmer).
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
Figure 2. AD5173
Unlike traditional OTP digital potentiometers, the AD5172/
AD5173 have a unique temporary OTP overwrite feature that
allows for new adjustments even after the fuse has been blown.
However, the OTP setting is restored during subsequent power-
up conditions. This feature allows users to treat these digital
potentiometers as volatile potentiometers with a programmable
preset.
For applications that program the AD5172/AD5173 at the
factory, Analog Devices offers device programming software
running on Windows廬 NT廬, 2000, and XP廬 operating systems.
This software effectively replaces any external I
2
C controllers,
thus enhancing the time-to-market of the user鈥檚 systems.
1
The terms digital potentiometer, VR, and RDAC are used interchangeably.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
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