參數(shù)資料
型號(hào)： AD5172BRM50-RL7
廠商： ANALOG DEVICES INC
元件分類： 數(shù)字電位計(jì)
英文描述： Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers
中文描述： DUAL 50K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, PDSO10
封裝： 3 X 4.90 MM, MO-187BA, MSOP-10
文件頁(yè)數(shù)： 1/24頁(yè)
文件大?。?/td> 948K
代理商： AD5172BRM50-RL7
256-Position One-Time Programmable
Dual-Channel I
2
C Digital Potentiometers
AD5172/AD5173
FEATURES
2-channel, 256-position
OTP (one-time programmable) set-and-forget resistance
setting, low cost alternative to EEMEM
Unlimited adjustments prior to OTP activation
OTP overwrite allows dynamic adjustments with user
defined preset
End-to-end resistance: 2.5 k, 10 k, 50 k, 100 k
Compact MSOP-10 (3 mm × 4.9 mm) package
Fast settling time: t
S
= 5 μs 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/°C
Low power, I
DD
= 6 μA max
Wide operating temperature: –40°C to +125°C
Evaluation board and software are available
Software replaces μC in factory programming applications
APPLICATIONS
Systems calibration
Electronics level setting
Mechanical Trimmers 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
GENERAL OVERVIEW
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.
Tel: 781.329.4700
www.analog.com
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).
FUNCTIONAL BLOCK DIAGRAMS
A1
V
DD
GND
SDA
SCL
W1
RDAC
REGISTER 1
SERIAL INPUT
REGISTER
0
B1
A2
W2
RDAC
REGISTER 2
B2
FUSE
LINKS
1
2
/
8
Figure 1. AD5172
V
DD
GND
SDA
SCL
AD0
AD1
W1
RDAC
REGISTER 1
ADDRESS
DECODE
SERIAL INPUT
REGISTER
B1
W2
RDAC
REGISTER 2
B2
FUSE
LINKS
1
2
/
8
0
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 NT, 2000, and XP operating systems.
This software effectively replaces any external I
2
C controllers,
thus enhancing the time-to-market of the user’s systems.
1
The terms digital potentiometer, VR, and RDAC are used interchangeably.
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