AD5251BRUZ50 Analog Devices Inc, AD5251BRUZ50 Datasheet

IC,Digital Potentiometer,CMOS,TSSOP,14PIN,PLASTIC

AD5251BRUZ50

Manufacturer Part Number

AD5251BRUZ50

Description

IC,Digital Potentiometer,CMOS,TSSOP,14PIN,PLASTIC

Manufacturer

Analog Devices Inc

Datasheet

1.AD5252BRUZ10.pdf (28 pages)

Specifications of AD5251BRUZ50

Taps

Resistance (ohms)

50K

Number Of Circuits

Temperature Coefficient

650 ppm/°C Typical

Memory Type

Non-Volatile

Interface

I²C, 2-Wire Serial

Voltage - Supply

2.7 V ~ 5.5 V, ±2.25 V ~ 2.75 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

14-TSSOP

Resistance In Ohms

50K

Number Of Elements

# Of Taps

Resistance (max)

50KOhm

Power Supply Requirement

Single/Dual

Interface Type

Serial (2-Wire/I2C)

Single Supply Voltage (typ)

3/5V

Dual Supply Voltage (typ)

±2.5V

Single Supply Voltage (min)

2.7V

Single Supply Voltage (max)

5.5V

Dual Supply Voltage (min)

±2.25V

Dual Supply Voltage (max)

±2.75V

Operating Temp Range

-40C to 85C

Operating Temperature Classification

Industrial

Mounting

Surface Mount

Pin Count

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

AD5251BRUZ50

Manufacturer:

ADI/亚德诺

Quantity:

20 000

Current page: 1 of 28
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FEATURES

AD5251: Dual 64-position resolution

AD5252: Dual 256-position resolution

1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ

Nonvolatile memory

Power-on refreshed with EEMEM settings in 300 μs typ

EEMEM rewrite time = 540 μs typ

Resistance tolerance stored in nonvolatile memory

12 extra bytes in EEMEM for user-defined information

Direct read/write access of RDAC

Predefined linear increment/decrement commands

Predefined ±6 dB step change commands

Synchronous or asynchronous dual-channel update

Wiper setting readback

4 MHz bandwidth—1 kΩ version

Single supply 2.7 V to 5.5 V

Dual supply ±2.25 V to ±2.75 V

2 slave address decoding bits allow operation of 4 devices

100-year typical data retention, T

Operating temperature: –40°C to +85°C

APPLICATIONS

Mechanical potentiometer replacement

General-purpose DAC replacement

LCD panel V

White LED brightness adjustment

RF base station power amp bias control

Programmable gain and offset control

Programmable voltage-to-current conversion

Programmable power supply

Sensor calibrations

GENERAL DESCRIPTION

The AD5251/AD5252 are dual-channel, I

ory, digitally controlled potentiometers with 64/256 positions,

respectively. These devices perform the same electronic adjust-

ment functions as mechanical potentiometers, trimmers, and

variable resistors. The parts’ versatile programmability allows

multiple modes of operation, including read/write access in the

RDAC and EEMEM registers, increment/decrement of resistance,

resistance changes in ±6 dB scales, wiper setting readback, and

extra EEMEM for storing user-defined information, such as

memory data for other components, look-up table, or system

identification information.

Rev. B

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.

C-compatible serial interface

COM

adjustment

stores wiper setting w/write protection

and EEMEM registers

= 55°C

C®, nonvolatile mem-

Dual 64-/256-Position I

Memory Digital Potentiometers

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

The AD5251/AD5252 allow the host I

any of the 64-/256-step wiper settings in the RDAC registers

and store them in the EEMEM. Once the settings are stored,

they are restored automatically to the RDAC registers at system

power-on; the settings can also be restored dynamically.

The AD5251/AD5252 provide additional increment,

decrement, +6 dB step change, and –6 dB step change in

synchronous or asynchronous channel update mode. The

increment and decrement functions allow stepwise linear

adjustments, with a ± 6 dB step change equivalent to doubling

or halving the RDAC wiper setting. These functions are useful

for steep-slope, nonlinear adjustments, such as white LED

brightness and audio volume control.

The AD5251/AD5252 have a patented resistance-tolerance

storing function that allows the user to access the EEMEM and

obtain the absolute end-to-end resistance values of the RDACs

for precision applications.

The AD5251/AD5252 are available in TSSOP-14 packages in

1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ options. All parts are

guaranteed to operate over the –40°C to +85°C extended

industrial temperature range.

DGND

The terms nonvolatile memory and EEMEM are used interchangeably.

The terms digital potentiometer and RDAC are used interchangeably.

SDA

SCL

AD0

AD1

INTERFACE

ON RESET

POWER-

SERIAL

FUNCTIONAL BLOCK DIAGRAM

POWER-ON

CONTROL

REFRESH

EEMEM

DATA

RDAC EEMEM

Figure 1.

AD5251/AD5252

CONTROL LOGIC

DECODE LOGIC

RAB

TOL

COMMAND

ADDRESS

C Nonvolatile

C controllers to write

RDAC1

REGIS-

RDAC3

REGIS-

TER

www.analog.com

AD5251/

AD5252

RDAC1

RDAC3

Related parts for AD5251BRUZ50

AD5251BRUZ50 Summary of contents

Page 1

FEATURES AD5251: Dual 64-position resolution AD5252: Dual 256-position resolution 1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ 1 Nonvolatile memory stores wiper setting w/write protection Power-on refreshed with EEMEM settings in 300 μs typ EEMEM rewrite time = 540 μs ...

Page 2

AD5251/AD5252 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Electrical Characteristics ................................................................. 3 1 kΩ Version .................................................................................. 3 10 kΩ, 50 kΩ, 100 kΩ Versions .................................................. ...

Page 3

ELECTRICAL CHARACTERISTICS 1 kΩ VERSION ± 10 ± 10 Table 1. Parameter DC CHARACTERISTICS— RHEOSTAT MODE Resolution 2 Resistor Differential Nonlinearity Resistor Nonlinearity 2 Nominal ...

Page 4

AD5251/AD5252 Parameter DIGITAL INPUTS AND OUTPUTS Input Logic High Input Logic Low Output Logic High (SDA) Output Logic Low (SDA) WP Leakage Current A0 Leakage Current Input Leakage Current (Other than WP and A0) 5 Input Capacitance POWER SUPPLIES Single-Supply ...

Page 5

VERSIONS ± 10 ± 10 Table 2. Parameter Symbol DC CHARACTERISTICS— RHEOSTAT MODE Resolution N 2 Resistor Differential Nonlinearity ...

Page 6

AD5251/AD5252 Parameter Symbol POWER SUPPLIES Single-Supply Power Range V DD Dual-Supply Power Range V DD Positive Supply Current I DD Negative Supply Current I SS EEMEM Data Storing Mode I DD_STORE Current EEMEM Data Restoring Mode I DD_RESTORE 6 Current ...

Page 7

INTERFACE TIMING CHARACTERISTICS All input control voltages are specified with t characteristics are measured using both V Table 3. Interface Timing and EEMEM Reliability Characteristics (All Parts) Parameter INTERFACE TIMING SCL Clock Frequency t Bus-Free Time Between Stop and Start ...

Page 8

AD5251/AD5252 ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 4. Parameter V to GND GND GND Maximum Current I ...

Page 9

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 5. Pin Function Descriptions Pin No. Mnemonic Description 1 V Positive Power Supply Pin. Connect +2 for single supply or ±2.7 V for dual supply, where ...

Page 10

AD5251/AD5252 TYPICAL PERFORMANCE CHARACTERISTICS 1.0 0.8 0 –40°C, +25°C, +85°C, +125°C A 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1 128 160 CODE (Decimal) Figure 3. R-INL vs. Code 1.0 0 –40°C, ...

Page 11

DATA = 0x00 200 25°C 180 A 160 140 120 V = 5.5V DD 100 T = 25° (V) BIAS ...

Page 12

AD5251/AD5252 0 –6 0x80 –12 0x40 –18 0x20 –24 0x10 –30 0x08 –36 0x04 –42 0x02 –48 0x01 –54 –60 10 100 1k 10k FREQUENCY (Hz) Figure 15. AD5252 Gain vs. Frequency vs. Code 0x80 –6 0x40 –12 ...

Page 13

R = 1kΩ 25° 10kΩ 50kΩ 100kΩ CODE ...

Page 14

AD5251/AD5252 INTERFACE SCL SDA INTERFACE GENERAL DESCRIPTION FROM MASTER TO SLAVE FROM SLAVE TO MASTER S = START CONDITION P = STOP CONDITION A = ACKNOWLEDGE ...

Page 15

I C INTERFACE DETAIL DESCRIPTION FROM MASTER TO SLAVE FROM SLAVE TO MASTER S = START CONDITION P = STOP CONDITION A = ACKNOWLEDGE (SDA LOW NOT ACKNOWLEDGE (SDA HIGH) R/W = READ ENABLE AT HIGH AND ...

Page 16

AD5251/AD5252 RDAC/EEMEM Write Setting the wiper position requires an RDAC write operation. The single write operation is shown in Figure 27, and the consecutive write operation is shown in Figure 28. In the consecutive write operation, if the RDAC is ...

Page 17

SLAVE ADDRESS 1 READ Figure 29. RDAC Current Read (Restricted to Previously Selected Address Stored in the Register) S SLAVE ADDRESS 0 A INSTRUCTION AND ADDRESS ...

Page 18

AD5251/AD5252 RDAC/EEMEM Quick Commands The AD5251/AD5252 feature 12 quick commands that facilitate easy manipulation of RDAC wiper settings and provide RDAC- to-EEMEM storing and restoring functions. The command format is shown in Figure 31, and the command descriptions are shown ...

Page 19

Table 10. Address Table for Reading Tolerance (CMD/ REG = 0, EE/ RDAC = ...

Page 20

AD5251/AD5252 2 I C-COMPATIBLE 2-WIRE SERIAL BUS 1 SCL AD1 AD0 R SDA START BY FRAME 1 MASTER SLAVE ADDRESS BYTE 1 SCL SDA 0 START BY MASTER The first byte of the AD5251/AD5252 is ...

Page 21

THEORY OF OPERATION The AD5251/AD5252 are dual-channel digital potentiometers in 1 kΩ, 10 kΩ, 50 kΩ, or 100 kΩ that allow 64/256 linear resistance step adjustments. The AD5251/AD5252 employ double-gate CMOS EEPROM technology, which allows resistance settings and user-defined data ...

Page 22

AD5251/AD5252 DIGITAL INPUT/OUTPUT CONFIGURATION SDA is a digital input/output with an open-drain MOSFET that requires a pull-up resistor for proper communication. On the other hand, SCL and WP are digital inputs for which pull-up resistors are recommended to minimize the ...

Page 23

LAYOUT AND POWER SUPPLY BIASING It is always a good practice to employ a compact, minimum lead-length layout design. The leads to the input should be as direct as possible, with a minimum conductor length. Ground paths should have low ...

Page 24

AD5251/AD5252 100 (Code in Decimal) Figure 42. AD5251 R (D) and R (D) vs. Decimal Code WA WB Since the digital potentiometer is not ideal Ω finite wiper ...

Page 25

APPLICATIONS INFORMATION LCD PANEL V ADJUSTMENT COM Large LCD panels usually require an adjustable V centered around with ±1 V swing and small steps adjustment. This example represents common DAC appli- cations where the window ...

Page 26

AD5251/AD5252 OUTLINE DIMENSIONS 4.50 4.40 4.30 PIN 1 1.05 1.00 0.80 0.15 0.05 COPLANARITY 0.10 5.10 5.00 4. 6.40 BSC 1 7 0.65 BSC 1.20 0.20 MAX 0.09 8° SEATING 0° 0.30 PLANE 0.19 COMPLIANT TO JEDEC STANDARDS ...

Page 27

... ORDERING GUIDE 1 Model Step AD5251BRU1 64 AD5251BRU1-RL7 64 2 AD5251BRUZ1 64 AD5251BRU10 64 AD5251BRU10-RL7 64 2 AD5251BRUZ10 64 AD5251BRU50 64 AD5251BRU50-RL7 64 AD5251BRUZ50 2 64 AD5251BRU100 64 AD5251BRU100-RL7 64 2 AD5251BRUZ100 64 AD5251EVAL 64 AD5252BRU1 256 AD5252BRU1-RL7 256 2 AD5252BRUZ1 256 2 AD5252BRUZ1-RL7 256 AD5252BRU10 256 AD5252BRU10-RL7 256 2 AD5252BRUZ10 256 2 AD5252BRUZ10-RL7 256 AD5252BRU50 256 AD5252BRU50-RL7 256 ...

Page 28

AD5251/AD5252 NOTES 2 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 Rights to use these components system, ...

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