AD5243(RevC) 查看數據表（PDF） - Analog Devices
零件编号
产品描述 (功能)
生产厂家
AD5243 Datasheet PDF : 20 Pages
| |||
Data Sheet
Dual, 256-Position, I2C-Compatible
Digital Potentiometers
AD5243/AD5248
FEATURES
2-channel, 256-position potentiometers
End-to-end resistance: 2.5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ
Compact 10-lead MSOP (3 mm × 4.9 mm) package
Fast settling time: tS = 5 µs typical on power-up
Full read/write of wiper register
Power-on preset to midscale
Extra package address decode pins: AD0 and AD1 (AD5248 only)
Computer software replaces microcontroller in factory
programming applications
Single supply: 2.7 V to 5.5 V
Low temperature coefficient: 35 ppm/°C
Low power: IDD = 6 µA maximum
Wide operating temperature: −40°C to +125°C
Evaluation board available
FUNCTIONAL BLOCK DIAGRAMS
A1 W1 B1
A2 W2 B2
VDD
GND
SDA
SCL
WIPER
REGISTER 1
WIPER
REGISTER 2
AD5243
PC INTERFACE
Figure 1. AD5243
W1 B1
W2 B2
APPLICATIONS
Systems calibrations
Electronics level settings
Mechanical trimmers replacement in new designs
Permanent factory printed circuit board (PCB) setting
Transducer adjustment of pressure, temperature, position,
chemical, and optical sensors
RF amplifier biasing
Gain control and offset adjustment
GENERAL DESCRIPTION
The AD5243 and AD5248 provide a compact 3 mm × 4.9 mm
packaged solution for dual, 256-position adjustment applications.
The AD5243 performs the same electronic adjustment function
as a 3-terminal mechanical potentiometer, and the AD5248
performs the same adjustment function as a 2-terminal variable
resistor. Available in four end-to-end resistance values (2.5 kΩ,
10 kΩ, 50 kΩ, and 100 kΩ), these low temperature coefficient
devices are ideal for high accuracy and stability-variable
resistance adjustments. The wiper settings are controllable
through the I2C-compatible digital interface. The AD5248 has
extra package address decode pins, AD0 and AD1, allowing
multiple parts to share the same I2C, 2-wire bus on a PCB. The
resistance between the wiper and either endpoint of the fixed
resistor varies linearly with respect to the digital code transferred
VDD
GND
RDAC
REGISTER 1
RDAC
REGISTER 2
AD0
AD1
ADDRESS
/ DECODE
8
AD5248
SDA
SCL
SERIAL INPUT
REGISTER
Figure 2. AD5248
into the RDAC latch. (The terms digital potentiometer, VR,
and RDAC are used interchangeably.)
Operating from a 2.7 V to 5.5 V power supply and consuming
less than 6 µA allows the AD5243/AD5248 to be used in
portable battery-operated applications.
For applications that program the AD5243/AD5248 at the
factory, Analog Devices, Inc., offers device programming
software running on Windows® NT/2000/XP operating systems.
This software effectively replaces the need for external I2C
controllers, which in turn enhances the time to market of
systems. An AD5243/AD5248 evaluation kit and software are
available. The kit includes a cable and instruction manual.
Rev. C
Document Feedback
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2004–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
Share Link: 