ad5172brm10z-rl7 Analog Devices, Inc., ad5172brm10z-rl7 Datasheet

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ad5172brm10z-rl7

Manufacturer Part Number
ad5172brm10z-rl7
Description
256-position One-time Programmable Dual-channel I2c Digital Potentiometers
Manufacturer
Analog Devices, Inc.
Datasheet
FEATURES
2-channel, 256-position potentiometers
One-time programmable (OTP) set-and-forget resistance
Unlimited adjustments prior to OTP activation
OTP overwrite allows dynamic adjustments with user-
End-to-end resistance: 2.5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
Compact MSOP-10 (3 mm × 4.9 mm) package
Fast settling time: t
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
Wide operating temperature: −40°C to +125°C
Software available for 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,
RF amplifier biasing
Automotive electronics adjustment
Gain control and offset adjustment
GENERAL OVERVIEW
The AD5172/AD5173 are dual-channel, 256-position, one-time
programmable (OTP) digital potentiometers
link technology to achieve memory retention of resistance
settings. 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. These devices perform the same
electronic adjustment function as mechanical potentiometers or
variable resistors with enhanced resolution, solid-state reliability,
and superior low temperature coefficient performance.
The AD5172/AD5173 are programmed using a 2-wire, I
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. D
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.
setting provides a low cost alternative to EEMEM
defined preset
chemical, and optical sensors
DD
= 6 μA maximum
S
= 5 μs typical in power-up
1
that employ fuse
Dual-Channel, I
256-Position, One-Time Programmable,
2
C-
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
Unlike traditional OTP digital potentiometers, the AD5172/
AD5173 have a unique temporary OTP overwrite feature that
allows for new adjustments even after a fuse is blown. However, the
OTP setting is restored during subsequent power-up conditions.
This 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® 2000, Windows NT®, and Windows XP
operating systems. This software effectively replaces any
external I
the user’s systems.
1
The terms digital potentiometer, VR, and RDAC are used interchangeably.
2
GND
C
SDA
GND
SCL
AD0
SDA
V
AD1
SCL
V
2
DD
DD
C controllers, thus enhancing the time-to-market of
FUNCTIONAL BLOCK DIAGRAMS
®
Figure 1. AD5172 Functional Block Diagram
Figure 2. AD5173 Functional Block Diagram
Digital Potentiometers
A1
ADDRESS
1
1
DECODE
REGISTER 1
REGISTER 1
RDAC
RDAC
W1
W1
©2006 Analog Devices, Inc. All rights reserved.
SERIAL INPUT
SERIAL INPUT
B1
REGISTER
B1
REGISTER
AD5172/AD5173
8
8
LINKS
LINKS
FUSE
FUSE
A2
2
2
REGISTER 2
REGISTER 2
RDAC
RDAC
W2
W2
B2
B2
www.analog.com

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ad5172brm10z-rl7 Summary of contents

Page 1

... SERIAL INPUT REGISTER Figure 1. AD5172 Functional Block Diagram FUSE DD LINKS 1 2 RDAC RDAC REGISTER 1 REGISTER 2 ADDRESS DECODE 8 SERIAL INPUT REGISTER Figure 2. AD5173 Functional Block Diagram 2 C controllers, thus enhancing the time-to-market of www.analog.com ©2006 Analog Devices, Inc. All rights reserved. ...

Page 2

AD5172/AD5173 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Overview............................................................................. 1 Functional Block Diagrams............................................................. 1 Revision History ............................................................................... 2 Electrical Characteristics—2.5 kΩ Version................................... 3 Electrical Characteristics—10 kΩ, 50 kΩ, 100 kΩ Versions....... 5 Timing Characteristics—2.5 kΩ, 10 kΩ, 50 ...

Page 3

ELECTRICAL CHARACTERISTICS—2.5 kΩ VERSION ± 10 ± 10 Table 1. Parameter DC CHARACTERISTICS—RHEOSTAT MODE 2 Resistor Differential Nonlinearity 2 Resistor Integral Nonlinearity 3 Nominal Resistor Tolerance Resistance ...

Page 4

AD5172/AD5173 1 Typical specifications represent average readings at 25°C and V 2 Resistor position nonlinearity error, R-INL, is the deviation from an ideal value measured between the maximum resistance and the minimum resistance wiper positions. R-DNL measures the relative step ...

Page 5

ELECTRICAL CHARACTERISTICS—10 kΩ, 50 kΩ, 100 kΩ VERSIONS ± 10 ± 10 Table 2. Parameter DC CHARACTERISTICS—RHEOSTAT MODE 2 Resistor Differential Nonlinearity 2 Resistor Integral Nonlinearity 3 ...

Page 6

AD5172/AD5173 1 Typical specifications represent average readings at 25°C and V 2 Resistor position nonlinearity error, R-INL, is the deviation from an ideal value measured between the maximum resistance and the minimum resistance wiper positions. R-DNL measures the relative step ...

Page 7

TIMING CHARACTERISTICS—2.5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ VERSIONS ± 10 ± 10 Table 3. Parameter INTERFACE TIMING CHARACTERISTICS SCL Clock Frequency t ...

Page 8

AD5172/AD5173 ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 4. Parameter V to GND GND Terminal Current Bx Wx Pulsed ...

Page 9

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS AD5172 TOP VIEW GND SDA SCL 5 DD Figure 3. AD5172 Pin Configuration Table 5. AD5172 Pin Function Descriptions ...

Page 10

AD5172/AD5173 TYPICAL PERFORMANCE CHARACTERISTICS 2.0 1.5 1 2. 5.5V DD –0.5 –1.0 –1.5 –2 128 160 CODE (DECIMAL) Figure 5. R-INL vs. Code vs. Supply Voltages 0.5 0.4 0.3 ...

Page 11

–40°C, +25°C, +85°C, +125°C A 1.0 0 5.5V DD –0 –40°C, +25°C, +85°C, +125°C A –1.0 –1.5 –2 128 160 192 CODE (DECIMAL) ...

Page 12

AD5172/AD5173 2. –40°C TO +85°C, –40°C TO +125° – 5. –40°C TO +85°C, –40°C TO +125°C A –20 – ...

Page 13

V = 5. 2.7V DD 0.01 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 DIGITAL INPUT VOLTAGE (V) Figure 23. I vs. Input Voltage SCL Figure 24. Digital Feedthrough V W2 ...

Page 14

AD5172/AD5173 TEST CIRCUITS Figure 29 to Figure 36 illustrate the test circuits that define the test conditions used in the product specification tables. DUT 1LSB = V+/ Figure 29. Potentiometer Divider Nonlinearity ...

Page 15

THEORY OF OPERATION SCL SDA The AD5172/AD5173 are 256-position, digitally controlled variable resistors (VRs) that employ fuse link technology to achieve memory retention of resistance setting. An internal power-on preset places the wiper at midscale during power-on. If the OTP ...

Page 16

AD5172/AD5173 RDAC S LATCH AND DECODER Figure 39. AD5172/AD5173 Equivalent RDAC Circuit The general equation that determines the digitally programmed output resistance between W and ...

Page 17

Operation of the digital potentiometer in the divider mode results in a more accurate operation over temperature. Unlike rheostat mode, the output voltage is dependent mainly on the ratio of the internal resistors R and R WA values. Thus, the ...

Page 18

AD5172/AD5173 APPLY FOR OTP ONLY 5.5V R1 10kΩ 2. 10µF 0.1µ FDV302P, NDS0610 Figure 46. Isolate 5.5 V OTP Supply from 2.7 V Normal Operating Supply For users who operate their systems ...

Page 19

DEVICE PROGRAMMING SOFTWARE Due to the advantages of the one-time programmable feature, consider programming the device in the factory before shipping the final product to end users. ADI offers device programming software that can be implemented in the factory on ...

Page 20

AD5172/AD5173 INTERFACE Table 9 and Table 10 use the following codes Start condition Stop condition Acknowledge. AD0, AD1 = Package pin programmable address bits Don’t care Write. ...

Page 21

SCL SDA SCL SDA START BY FRAME 1 MASTER SLAVE ADDRESS BYTE 1 SCL AD1 ...

Page 22

AD5172/AD5173 2 I C-COMPATIBLE, 2-WIRE SERIAL BUS This section describes how the 2-wire, I operates. The master initiates a data transfer by establishing a start condition, which is when a high-to-low transition on the SDA line occurs while SCL is ...

Page 23

A repeated write function gives the user flexibility to update the RDAC output a number of times after addressing and instructing the part only once. For example, after the RDAC has acknowledged its slave address and instruction bytes in write ...

Page 24

AD5172/AD5173 OUTLINE DIMENSIONS 3.10 3.00 2. 5.15 3.10 4.90 3.00 4.65 2. PIN 1 0.50 BSC 0.95 0.85 1.10 MAX 0.75 0.15 0.33 SEATING 0.23 0.05 PLANE 0.17 0.08 COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-BA ...

Page 25

ORDERING GUIDE Model 1 R (kΩ) AB AD5172BRM2.5 2.5 AD5172BRM2.5-RL7 2.5 2 AD5172BRMZ2.5 2.5 AD5172BRM10 10 AD5172BRM10-RL7 10 2 AD5172BRMZ10 10 2 AD5172BRMZ10-RL7 10 AD5172BRM50 50 AD5172BRM50-RL7 50 AD5172BRMZ50 AD5172BRMZ50-RL7 50 AD5172BRM100 100 AD5172BRM100-RL7 100 2 AD5172BRMZ100 ...

Page 26

AD5172/AD5173 NOTES Rev Page ...

Page 27

NOTES Rev Page AD5172/AD5173 ...

Page 28

... C components of Analog Devices or one of its sublicensed Associated Companies conveys a license for the purchaser under the Philips I Rights to use these components system, provided that the system conforms to the I ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners Standard Specification as defined by Philips. ...

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