ad5259 Analog Devices, Inc., ad5259 Datasheet

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ad5259

Manufacturer Part Number
ad5259
Description
Nonvolatile, I2c-compatible 256-position, Digital Potentiometer
Manufacturer
Analog Devices, Inc.
Datasheet

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FEATURES
Nonvolatile memory maintains wiper settings
256-position
Thin LFCSP-10 (3 mm x 3 mm x 0.8 mm) package
Compact MSOP-10 (3 mm × 4.9 mm x 1.1mm) package
I
V
End-to-end resistance 5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
Resistance tolerance stored in EEPROM (0.1% accuracy)
Power-on EEPROM refresh time < 1ms
Software write protect command
Address Decode Pin AD0 and Pin AD1 allow
100-year typical data retention at 55°C
Wide operating temperature −40°C to +85°C
3 V to 5 V single supply
APPLICATIONS
LCD panel V
LCD panel brightness and contrast control
Mechanical potentiometer replacement in new designs
Programmable power supplies
RF amplifier biasing
Automotive electronics adjustment
Gain control and offset adjustment
Fiber to the home systems
Electronics level settings
GENERAL DESCRIPTION
The AD5259 provides a compact, nonvolatile LFCSP-10
(3 mm × 3 mm) or MSOP-10 (3 mm × 4.9 mm) packaged
solution for 256-position adjustment applications. These
devices perform the same electronic adjustment function
as mechanical potentiometers
with enhanced resolution and solid-state reliability.
The wiper settings are controllable through an I
digital interface that is also used to read back the wiper register
and EEPROM content. Resistor tolerance is also stored within
EEPROM, providing an end-to-end tolerance accuracy of 0.1%.
A separate V
users who need multiple parts on one bus, Address Bit AD0 and
Address Bit AD1 allow up to four devices on the same bus.
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.
2
C®-compatible interface
LOGIC
4 packages per bus
pin provides increased interface flexibility
COM
LOGIC
adjustment
pin delivers increased interface flexibility. For
1
or variable resistors, but
2
C-compatible
256-Position, Digital Potentiometer
V
1
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
SDA
GND
SCL
AD0
AD1
LOGIC
The terms digital potentiometer, VR (variable resistor), and RDAC are used
interchangeably.
GND
SDA
SCL
AD0
AD1
V
DD
INTERFACE
Nonvolatile, I
SERIAL
V
INTERFACE
LOGIC
ON RESET
I
2
POWER-
SERIAL
C
I
2
Figure 2. Block Diagram Showing Level Shifters
C
FUNCTIONAL BLOCK DIAGRAMS
DECODE LOGIC
DECODE LOGIC
COMMAND
SDA
ADDRESS
CONTROL
AD0
AD1
SCL
EEPROM
CONNECTION DIAGRAM
LOGIC
W
8
8
© 2005 Analog Devices, Inc. All rights reserved.
Figure 1. Block Diagram
1
2
3
4
5
DATA
CONTROL
(Not to Scale)
EEPROM
Figure 3. Pinout
AD5259
TOP VIEW
CONTROL LOGIC
RDAC
DECODE LOGIC
DECODE LOGIC
REGISTER
COMMAND
SHIFTER
ADDRESS
LEVEL
RDAC
AND
2
10
C-Compatible
9
8
7
6
A
B
V
GND
V
DD
LOGIC
REGISTER
RDAC
V
DD
www.analog.com
AD5259
AD5259
RDAC
A
W
B
A
W
B

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ad5259 Summary of contents

Page 1

... Automotive electronics adjustment Gain control and offset adjustment Fiber to the home systems Electronics level settings GENERAL DESCRIPTION The AD5259 provides a compact, nonvolatile LFCSP- × 3 mm) or MSOP- × 4.9 mm) packaged solution for 256-position adjustment applications. These devices perform the same electronic adjustment function 1 ...

Page 2

... AD5259 TABLE OF CONTENTS Specifications..................................................................................... 3 Electrical Characteristics............................................................. 3 Timing Characteristics ................................................................ 5 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 Pin Configuration and Function Descriptions............................. 7 Typical Performance Characteristics ............................................. 8 Test Circuits..................................................................................... 13 Theory of Operation ...................................................................... 14 Programming the Variable Resistor......................................... 14 Programming the Potentiometer Divider ............................... C-Compatible Interface............................................................... 15 Writing ......................................................................................... 15 Storing/Restoring ....................................................................... 15 Reading ........................................................................................ 15 REVISION HISTORY 7/05 — ...

Page 3

... MHz, measured to GND code = 0x80 MHz, measured to GND, W code = 0x80 Rev Page AD5259 1 Min Typ Max Unit LSB –1 ±0.2 +1 −1 ±0.1 +1 −0.5 ±0.1 +0.5 LSB –4 ±0.3 +4 −2 ±0.2 +2 − ...

Page 4

... AD5259 Parameter DIGITAL INPUTS AND OUTPUTS Input Logic High Input Logic Low Leakage Current SDA, AD0, AD1 SCL – Logic High SCL – Logic Low Input Capacitance POWER SUPPLIES Power Supply Range Positive Supply Current Logic Supply Logic Supply Current Programming Mode Current (EEPROM) ...

Page 5

... C Interface Timing Diagram Rev Page Min Typ Max 0 400 1.3 0.6 1.3 0.6 0.6 0 0.9 100 300 300 0.6 26 300 and GND. DD 300 540 100 700 100 AD5259 Unit kHz μs μs μs μs μs μ μs ms μs μs μs kCycles Years t 10 ...

Page 6

... AD5259 ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 3. Parameter GND DD LOGIC GND MAX 1 Pulsed Continuous Digital Inputs and Output Voltage to GND Operating Temperature Range Maximum Junction Temperature (T ) JMAX Storage Temperature Lead Temperature (Soldering, 10 sec) ...

Page 7

... Programmable Pin 1 for Multiple Package Decoding. State is registered on power-up. Serial Data Input/Output. Serial Clock Input. Positive edge triggered. Logic Power Supply. Digital Ground. Positive Power Supply. B Terminal, GND ≤ V ≤ Terminal, GND ≤ V ≤ Rev Page AD5259 ...

Page 8

... AD5259 TYPICAL PERFORMANCE CHARACTERISTICS 5 kΩ +25°C; unless otherwise noted. DD LOGIC AB A 1.5 1.3 2.7V 1.1 0.9 0.7 0.5 0.3 0.1 –0.1 –0.3 5.5V –0 128 CODE (Decimal) Figure 6. R-INL vs. Code vs. Supply Voltage 0.5 0.4 2.7V 0.3 0.2 0.1 0 –0.1 –0.2 5.5V –0.3 –0.4 –0 128 160 CODE (Decimal) Figure 7. R-DNL vs. Code vs. Supply Voltage ...

Page 9

... Figure 17. Logic Supply Current vs. Temperature vs. V Rev Page AD5259 ZSE @ V = 2.7V DD ZSE @ V = 5.5V DD – TEMPERATURE (°C) Figure 15. Zero-Scale Error vs. Temperature V = 5.5V DD – TEMPERATURE (°C) Figure 16 ...

Page 10

... AD5259 400 100kΩ 300 50kΩ 200 10kΩ 100 0 –100 –200 –300 5kΩ –400 –500 –600 128 CODE (Decimal) Figure 18. Rheostat Mode Tempco (Δ 10kΩ 20 100kΩ –10 –20 5kΩ 50kΩ ...

Page 11

... DD LOGIC LOGIC (V) IH Figure 27. Logic Supply Current vs. Input Voltage = LOGIC ± 10% p-p AC PSRR @ V LOGIC = 3V DC ± 10% p-p AC PSRR @ V LOGIC 1k 10k 100k FREQUENCY (Hz) Figure 28. PSRR vs. Frequency V W SCL 400ns/DIV Figure 29. Digital Feedthrough AD5259 5 1M ...

Page 12

... AD5259 1μs/DIV Figure 30. Midscale Glitch, Code 0×7F to 0× SCL 2 Figure 31. Large Signal Settling Time Rev Page 200ns/DIV ...

Page 13

... Figure 35. Test Circuit for Power Supply Sensitivity (PSS, PSSR) DUT + AD8610 B OFFSET GND –5V +2.5V Figure 36. Test Circuit for Gain vs. Frequency 0. DUT CODE = 0x00 GND Figure 37. Test Circuit for Common-Mode Leakage Current AD5259 Δ Δ OUT ...

Page 14

... AD5259 THEORY OF OPERATION The AD5259 is a 256-position digitally-controlled variable resistor (VR) device. EEPROM is pre-loaded at midscale from the factory, and initial power-up is, accordingly, at midscale. PROGRAMMING THE VARIABLE RESISTOR Rheostat Operation The nominal resistance ( the RDAC between Terminal A AB and Terminal B is available in 5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ. ...

Page 15

... RDAC output is updated on each successive byte until a stop condition is received. If different instructions are needed, the write/read mode has to start again with a new slave address, instruction, and data byte. Similarly, a repeated read function of the RDAC is also allowed. Rev Page AD5259 ...

Page 16

... AD5259 2 I C-COMPATIBLE FORMAT The following generic, write, read, and store/restore control registers for the AD5259 all refer to the device addresses listed in Table 5; the mode/condition reference key (S, P, SA, MA, NA and X) is listed below Start Condition P = Stop Condition SA = Slave Acknowledge MA = Master Acknowledge ...

Page 17

... Slave Address Byte ↑ Repeat start Instruction Byte Instruction Byte Rev Page AD5259 Read Back Data Read Back Data ...

Page 18

... SIGN 7 BITS FOR INTEGER NUMBER Figure 41. Format of Stored Tolerance in Sign Magnitude Format with Bit Position Descriptions. The AD5259 features a patented R tolerance storage in the AB nonvolatile memory. The tolerance is stored in the memory during factory production and can be read by users at any time. The knowledge of stored tolerance allows users to accurately calculate R ...

Page 19

... LOGIC SCL SDA MULTIPLE DEVICES ON ONE BUS GND The AD5259 has two configurable address pins, Pin AD0 and and GND LOGIC Pin AD1. The state of these two pins is registered upon power- up and decoded into a corresponding I address (see Table 5). This allows up to four devices on the bus to be written to or read from independently ...

Page 20

... AD5259 DISPLAY APPLICATIONS CIRCUITRY A special feature of the AD5259 is its unique separation of the V and V supply pins. The separation provides greater LOGIC DD flexibility in applications that do not always provide needed supply voltages. In particular, LCD panels often require a V range The circuit in Figure 46 is the rare excep- tion in which supply is available to power the digital potentiometer ...

Page 21

... AD5259BCPZ5- AD5259BRMZ10 AD5259BRMZ10- AD5259BCPZ10- AD5259BRMZ50 50 k AD5259BRMZ50- AD5259BCPZ50- AD5259BRMZ100 100 k 1 AD5259BRMZ100-R7 100 k 1 AD5259BCPZ100-R7 100 k 2 AD5259EVAL Pb-free part. 2 The evaluation board is shipped with the 10 kΩ R 1.50 BCS SQ 0.80 0.80 0.75 8° 0.60 0.70 0° ...

Page 22

... AD5259 NOTES Rev Page ...

Page 23

... NOTES Rev Page AD5259 ...

Page 24

... AD5259 NOTES Purchase of licensed I C components of Analog Devices or one of its sublicensed Associated Companies conveys a license for the purchaser under the Philips I C Patent 2 2 Rights to use these components system, provided that the system conforms to the I C Standard Specification as defined by Philips © ...

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