AD5170BRM50 Analog Devices Inc, AD5170BRM50 Datasheet

IC DGTL POT 50K 256POS 10-MSOP

AD5170BRM50

Manufacturer Part Number
AD5170BRM50
Description
IC DGTL POT 50K 256POS 10-MSOP
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD5170BRM50

Rohs Status
RoHS non-compliant
Taps
256
Resistance (ohms)
50K
Number Of Circuits
1
Temperature Coefficient
35 ppm/°C Typical
Memory Type
Non-Volatile
Interface
I²C, 2-Wire Serial
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
10-MSOP, Micro10™, 10-uMAX, 10-uSOP
Resistance In Ohms
50K
FEATURES
256-position digital potentiometer
Two-time programmable (TTP) set-and-forget resistance
Unlimited adjustments prior to one-time programming
OTP overwrite allows dynamic adjustments with user-
End-to-end resistance: 2.5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
Compact 10-lead MSOP: 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
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
Evaluation board and software are available
Software replaces MicroConverter® in factory programming
APPLICATIONS
Systems calibration
Electronics level setting
Mechanical trimmers replacement in new designs
Permanent factory PCB settings
Transducer adjustment of pressure, temperature, position,
RF amplifier biasing
Automotive electronics adjustments
Gain control and offset adjustments
GENERAL DESCRIPTION
The AD5170 is a 256-position, two-time programmable, digital
potentiometer
two opportunities to permanently program the resistance setting.
For users who do not need to program the digital potentiometer
setting in memory more than once, the OTP feature is a cost-
effective alternative to EEMEM. The AD5170 performs the same
electronic adjustment function as mechanical potentiometers or
variable resistors with enhanced resolution, solid-state reliability,
and superior low temperature coefficient performance.
The AD5170 is programmed using a 2-wire, I
digital interface. Unlimited adjustments are allowed before
permanently setting the resistance value, and there are two
opportunities for permanent programming. During OTP
1
Rev. F
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.
The terms digital potentiometer, VR, and RDAC are used interchangeably.
setting allows second-chance permanent programming
(OTP) activation
defined preset
applications
chemical, and optical sensors
DD
1
that employs fuse link technology, giving users
= 6 μA maximum
S
= 5 μs typical in power-up
2
C®-compatible
256-Position, Two-Time Programmable,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
activation, a permanent blow fuse command freezes the wiper
position (analogous to placing epoxy on a mechanical trimmer).
Unlike traditional OTP digital potentiometers, the AD5170 has
a unique temporary OTP overwrite feature that allows for new
adjustments even after the fuse is blown. However, the OTP setting
is restored during subsequent power-up conditions. This feature
allows users to treat these digital potentiometers as volatile poten-
tiometers with a programmable preset.
For applications that program the AD5170 at the factory, Analog
Devices, Inc., offers device programming software that runs on
Windows NT®, Windows® 2000, and Windows XP operating
systems. This software effectively replaces any external I
trollers, thus enhancing the time-to-market of the user’s systems.
GND
SDA
AD0
AD1
SCL
V
I
DD
2
FUNCTIONAL BLOCK DIAGRAM
C Digital Potentiometer
©2003–2009 Analog Devices, Inc. All rights reserved.
ADDRESS
1
DECODE
A
SERIAL INPUT
Figure 1.
REGISTER
REGISTER
LINKS
FUSE
RDAC
W
2
B
8
AD5170
www.analog.com
2
C con-

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AD5170BRM50 Summary of contents

Page 1

FEATURES 256-position digital potentiometer Two-time programmable (TTP) set-and-forget resistance setting allows second-chance permanent programming Unlimited adjustments prior to one-time programming (OTP) activation OTP overwrite allows dynamic adjustments with user- defined preset End-to-end resistance: 2.5 kΩ, 10 kΩ, 50 kΩ, 100 ...

Page 2

AD5170 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Electrical Characteristics: 2.5 kΩ ............................................... 3 Electrical Characteristics: 10 kΩ, 50 kΩ, and 100 ...

Page 3

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

Page 4

AD5170 Parameter 13 DYNAMIC CHARACTERISTICS –3 dB Bandwidth Total Harmonic Distortion V Settling Time W Resistor Noise Voltage Density 1 Typical specifications represent average readings at 25°C and V 2 Resistor position nonlinearity error, R-INL, is the deviation from an ...

Page 5

Parameter POWER SUPPLIES Power Supply Range 8, 9 OTP Supply Voltage Supply Current OTP Supply Current 8, 10 Power Dissipation Power Supply Sensitivity 13 DYNAMIC CHARACTERISTICS –3 dB Bandwidth Total Harmonic Distortion V Settling Time (10 kΩ/50 kΩ/100 ...

Page 6

AD5170 TIMING CHARACTERISTICS: 2.5 kΩ, 10 kΩ, 50 kΩ, AND 100 kΩ ± 10 ± 10 Table 3. Parameter INTERFACE TIMING CHARACTERISTICS APPLY TO ...

Page 7

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

Page 8

AD5170 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 5. Pin Function Descriptions Pin No. Mnemonic Description Terminal. GND ≤ Terminal. GND ≤ AD0 Programmable Address Bit 0 for Multiple Package Decoding. 4 ...

Page 9

TYPICAL PERFORMANCE CHARACTERISTICS 2.0 1.5 1 2. –0.5 –1.0 –1.5 –2 128 160 CODE (DECIMAL) Figure 4. R-INL vs. Code vs. Supply Voltages 0.5 0.4 0.3 0 ...

Page 10

AD5170 1 –40°C, +25°C, +85°C, +125°C A 0.5 0 –0 5.5V DD –1 –40°C, +25°C, +85°C, +125°C A –1.5 –2 128 160 CODE (DECIMAL) Figure ...

Page 11

–40°C TO +85°C, –40°C TO +125° – 5. –40°C TO +85°C, –40°C TO +125°C A –20 – 128 ...

Page 12

AD5170 5. 2.7V DD 0.01 0 0.5 1.0 1.5 2.0 2.5 3.0 DIGITAL INPUT VOLTAGE (V) Figure 22 Supply Current vs. Digital Input Voltage SCL Figure 23. ...

Page 13

TEST CIRCUITS Figure 27 to Figure 32 illustrate the test circuits that define the test conditions used in the product specification tables DUT 1LSB = V+/ Figure 27. Test Circuit for Potentiometer ...

Page 14

AD5170 THEORY OF OPERATION SCL SDA The AD5170 is a 256-position, digitally controlled, variable resistor (VR) that employs fuse link technology to achieve memory retention of the resistance setting. An internal power-on preset places the wiper at midscale during power-on. ...

Page 15

SD BIT RDAC R S LATCH AND DECODER Figure 35. Equivalent RDAC Circuit The general equation that determines the digitally programmed output resistance between Terminal W ...

Page 16

AD5170 ESD PROTECTION All digital inputs, SDA, SCL, AD0, and AD1, are protected with a series input resistor and parallel Zener ESD structures, as shown in Figure 37 and Figure 38. 340Ω LOGIC GND Figure 37. ESD Protection of Digital ...

Page 17

LAYOUT CONSIDERATIONS It is good practice to employ compact, minimum lead length, layout design. The leads to the inputs should be as direct as possible, with a minimum conductor length. Ground paths should have low resistance and low inductance. Note ...

Page 18

AD5170 CONTROLLING THE AD5170 There are two ways of controlling the AD5170. Users can program the device with either computer software or external I SOFTWARE PROGRAMMING Due to the advantages of the one-time programmable feature, consider programming the device in ...

Page 19

Table 9. Write Mode AD1 AD0 Slave Address Byte Table 10. Read Mode AD1 AD0 R Slave Address Byte Table 11. SDA Bit Definitions and Descriptions Bit ...

Page 20

AD5170 CONTROLLER PROGRAMMING Write Bit Patterns 1 SCL AD1 AD0 SDA START BY FRAME 1 MASTER SLAVE ADDRESS BYTE Read Bit Pattern 1 SCL AD1 AD0 SDA ...

Page 21

After all the data bits are read or written, a stop condition is established by the master. A stop condition is defined as a low- to-high transition on the SDA line while SCL is high. In write mode, the master ...

Page 22

... ORDERING GUIDE Model R (kΩ) AB AD5170BRM2.5 2.5 AD5170BRM2.5-RL7 2.5 1 AD5170BRMZ2.5 2.5 AD5170BRM10 10 AD5170BRM10-RL7 10 1 AD5170BRMZ10 10 1 AD5170BRMZ10-RL7 10 AD5170BRM50 50 AD5170BRM50-RL7 50 1 AD5170BRMZ50 50 AD5170BRM100 100 AD5170BRM100-RL7 100 AD5170BRMZ100 1 100 2 AD5170EVAL RoHS Compliant Part. 2 The evaluation board is shipped with the 10 kΩ R 3.10 3.00 2. 5.15 3 ...

Page 23

NOTES Rev Page AD5170 ...

Page 24

AD5170 NOTES Purchase of licensed components of Analog Devices or one of its sublicensed Associated Companies conveys a license for the purchaser under the Philips I 2 Rights to use these components system, ...

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