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Nonvolatile Memory, Dual

1024-Position Digital Potentiometer

AD5235

FEATURES

Dual-channel, 1024-position resolution

25 kΩ, 250 kΩ nominal resistance

Low temperature coefficient: 35 ppm/°C

Nonvolatile memory stores wiper settings

Permanent memory write protection

Wiper setting readback

Resistance tolerance stored in EEMEM

Predefined linear increment/decrement instructions

Predefined ±6 dB/step log taper increment/decrement

instructions

SPI-compatible serial interface

3 V to 5 V single supply or ±2.5 V dual supply

26 bytes extra nonvolatile memory for user-defined

information

100-year typical data retention, T

= 55°C

Power-on refreshed with EEMEM settings

CLK

SDI

SDO

RDY

POWER-ON

RESET

EEMEM

CONTROL

EEMEM2

26 BYTES

USER EEMEM

RDAC2

SERIAL

INTERFACE

EEMEM1

FUNCTIONAL BLOCK DIAGRAM

ADDR

DECODE

AD5235

RDAC1

RDAC2

GND

02816-001

RTOL*

*RAB TOLERANCE

Figure 1.

APPLICATIONS

DWDM laser diode driver, optical supervisory systems

Mechanical potentiometer replacement

Instrumentation: gain, offset adjustment

Programmable voltage-to-current conversion

Programmable filters, delays, time constants

Programmable power supply

Low resolution DAC replacement

Sensor calibration

In the scratchpad programming mode, a specific setting can

be programmed directly to the RDAC

resistance between Terminal W and Terminal A and Terminal W

and Terminal B. This setting can be stored into the EEMEM

and is restored automatically to the RDAC register during

system power-on.

The EEMEM content can be restored dynamically or through

external PR strobing, and a WP function protects EEMEM

contents. To simplify the programming, the independent or

simultaneous linear-step increment or decrement commands

can be used to move the RDAC wiper up or down, one step at a

time. For logarithmic ±6 dB changes in the wiper setting, the

left or right bit shift command can be used to double or halve the

RDAC wiper setting.

The AD5235 patterned resistance tolerance is stored in the

EEMEM. The actual end-to-end resistance can, therefore, be

known by the host processor in readback mode. The host can

execute the appropriate resistance step through a software

routine that simplifies open-loop applications as well as

precision calibration and tolerance matching applications.

The AD5235 is available in a thin, 16-lead TSSOP package. The

part is guaranteed to operate over the extended industrial

temperature range of −40°C to +85°C.

GENERAL DESCRIPTION

The AD5235 is a dual-channel, nonvolatile memory,

digitally

controlled potentiometer

with 1024-step resolution. The device

performs the same electronic adjustment function as a mechanical

potentiometer with enhanced resolution, solid state reliability,

and superior low temperature coefficient performance. The

versatile programming of the AD5235 via an SPI®-compatible

serial interface allows 16 modes of operation and adjustment

including scratchpad programming, memory storing and restoring,

increment/decrement, ±6 dB/step log taper adjustment, wiper

setting readback, and extra EEMEM

for user-defined information

such as memory data for other components, look-up table, or

system identification information.

The terms nonvolatile memory and EEMEM are used interchangeably.

The terms digital potentiometer and RDAC are used interchangeably.

Rev. C

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

www.analog.com

AD5235

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications ....................................................................................... 1

General Description ......................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Electrical Characteristics—25 kΩ, 250 kΩ Versions ............... 3

Interface Timing and EEMEM Reliability

Characteristics—25 kΩ, 250 kΩ Versions ................................. 5

Absolute Maximum Ratings............................................................ 7

ESD Caution .................................................................................. 7

Pin Configuration and Function Descriptions ............................. 8

Typical Performance Characteristics ............................................. 9

Test Circuits ................................................................................. 12

Theory of Operation ...................................................................... 14

Scratchpad and EEMEM Programming .................................. 14

Basic Operation .......................................................................... 14

EEMEM Protection .................................................................... 15

Digital Input and Output Configuration................................. 15

Serial Data Interface ................................................................... 15

Daisy-Chain Operation ............................................................. 15

Terminal Voltage Operating Range.......................................... 16

Advanced Control Modes ......................................................... 18

RDAC Structure .......................................................................... 19

Programming the Variable Resistor ......................................... 20

Programming the Potentiometer Divider ............................... 20

Programming Examples ............................................................ 21

EVAL-AD5235EBZ Evaluation Kit .......................................... 21

Applications Information .............................................................. 22

Bipolar Operation from Dual Supplies.................................... 22

Gain Control Compensation .................................................... 22

High Voltage Operation ............................................................ 22

DAC.............................................................................................. 22

Bipolar Programmable Gain Amplifier ................................... 23

10-Bit Bipolar DAC .................................................................... 23

Programmable Voltage Source with Boosted Output ........... 23

Programmable Current Source ................................................ 24

Programmable Bidirectional Current Source ......................... 24

Programmable Low-Pass Filter ................................................ 24

Programmable Oscillator .......................................................... 25

Optical Transmitter Calibration with ADN2841 ................... 25

Resistance Scaling ...................................................................... 26

Resistance Tolerance, Drift, and Temperature Coefficient

Mismatch Considerations ......................................................... 26

RDAC Circuit Simulation Model ............................................. 27

Outline Dimensions ....................................................................... 28

Ordering Guide .......................................................................... 28

REVISION HISTORY

4/09—Rev.

B to Rev. C

Changes to Figure 1 .......................................................................... 1

Changes to Specifications ................................................................ 3

Changes to SDO, Description Column, Table 4 ........................... 8

Changes to Figure 18 ...................................................................... 11

Changes to Theory of Operation Section .................................... 14

Changes to Serial Data Interface Section .................................... 15

Changes to Linear Increment and Decrement Instructions

Section, Logarithmic Taper Mode Adjustment Section, and

Figure 42 .......................................................................................... 18

Changes to Rheostat Operations Section .................................... 20

Changes to Bipolar Programmable Gain Amplifier Section,

Figure 49, Table 21, and 10-Bit Bipolar DAC Section................ 23

Changes to Programmable Oscillator Section and Figure 56 ... 25

Changes to Ordering Guide .......................................................... 28

7/04—Rev. A to Rev. B

Updated Formatting ........................................................... Universal

Edits to Features, General Description, and Block Diagram .......1

Changes to Specifications .................................................................3

Replaced Timing Diagrams..............................................................6

Changes to Absolute Maximum Ratings ........................................7

Changes to Pin Function Descriptions ...........................................8

Changes to Typical Performance Characteristics..........................9

Additional Test Circuit (Figure 36) .................................................9

Edits to Theory of Operation ........................................................ 14

Edits to Applications ...................................................................... 23

Updated Outline Dimensions ....................................................... 27

8/02—Rev. 0 to Rev. A

Change to Features and General Description................................1

Change to Specifications ..................................................................2

Change to Calculating Actual End-to-End Terminal

Resistance Section .......................................................................... 14

Rev. C | Page 2 of 28

AD5235

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS—25 kΩ, 250 kΩ VERSIONS

= 3 V to 5.5 V, V

= 0 V; V

= 2.5 V, V

= −2.5 V, V

= V

, V

= V

, −40°C < T

< +85°C, unless otherwise noted. The part can be

operated at 2.7 V single supply, except from 0°C to −40°C, where a minimum of 3 V is needed.

Table 1.

Parameter

DC CHARACTERISTICS—RHEOSTAT

MODE (All RDACs)

Resistor Differential Nonlinearity

Resistor Integral Nonlinearity

Nominal Resistor Tolerance

Resistance Temperature Coefficient

Wiper Resistance

Nominal Resistance Match

DC CHARACTERISTICS—POTENTIOMETER

DIVIDER MODE (All RDACs)

Resolution

Differential Nonlinearity

Integral Nonlinearity

Voltage Divider Temperature Coefficient

Full-Scale Error

Zero-Scale Error

RESISTOR TERMINALS

Terminal Voltage Range

Capacitance Ax, Bx

Capacitance Wx

Common-Mode Leakage Current

5, 6

DIGITAL INPUTS AND OUTPUTS

Input Logic High

Input Logic Low

Input Logic High

Input Logic Low

Input Logic High

Input Logic Low

Output Logic High (SDO, RDY)

Output Logic Low

Input Current

Input Capacitance

POWER SUPPLIES

Single-Supply Power Range

Dual-Supply Power Range

Positive Supply Current

Negative Supply Current

EEMEM Store Mode Current

Symbol

Conditions

Min

Typ

Max

Unit

R-DNL

R-INL

∆R

(∆R

)/∆T × 10

AB1

AB2

Dx = 0x3FF

= 1 V/R

, V

= 5 V, code = 0x200

= 1 V/R

, V

= 3 V, code = 0x200

Code = 0x3FF, T

= 25°C

−2

−4

−30

200

±0.1

+30

100

LSB

ppm/°C

DNL

INL

(∆V

)/∆T × 10

WFSE

WZSE

, V

, C

(store)

−2

−4

Code = half scale

Code = full scale

Code = zero scale

−6

f = 1 MHz, measured to GND,

code = half-scale

f = 1 MHz, measured to GND,

code = half-scale

= V

With respect to GND, V

= 5 V

With respect to GND, V

= 5 V

With respect to GND, V

= 3 V

With respect to GND, V

= 3 V

With respect to GND, V

= +2.5 V,

= −2.5 V

With respect to GND, V

= +2.5 V,

= −2.5 V

PULL-UP

= 2.2 kΩ to 5 V (see Figure 36)

= 1.6 mA, V

LOGIC

= 5 V (see Figure 36)

= 0 V or V

2.4

0.01

Bits

LSB

ppm/°C

LSB

±2

μA

0.8

2.1

0.6

2.0

0.5

4.9

0.4

±2.25

= 0 V

= V

or V

= GND, T

= 25°C

= V

or V

= GND

= V

or V

= GND,

= +2.5 V, V

= −2.5 V

= V

or V

= GND,

= GND, I

≈ 0

= +2.5 V, V

= −2.5 V

Rev. C | Page 3 of 28

3.0

±2.25

3.5

−35

5.5

±2.75

4.5

6.0

AD5235

Parameter

EEMEM Restore Mode Current

Symbol

(restore)

DISS

THD

Conditions

= V

or V

= GND,

= GND, I

≈ 0

= +2.5 V, V

= −2.5 V

= V

or V

= GND

∆V

= 5 V ± 10%

−3 dB, V

= ±2.5 V,

= 25 kΩ/250 kΩ

= 1 V rms, V

= 0 V, f = 1 kHz

= 1 V rms, V

= 0 V, f = 1 kHz,

= 50 kΩ, 100 kΩ

= V

, V

= 0 V,

= 0.50% error band,

Code 0x000 to Code 0x200,

= 25 kΩ/250 kΩ

= 25 kΩ/250 kΩ, T

= 25°C

= V

, V

= 0 V, measured V

with

making full-scale change

= V

= +2.5 V, V

= V

= −2.5 V,

measured V

with V

= 5 V p-p @

f = 1 kHz, Code 1 = 0x200, Code 2 =

0x3FF, R

= 25 kΩ/250 kΩ

Min

0.3

−0.3

Typ

−3

0.002

125/12

0.05

0.045

4/36

Max

−9

0.01

Unit

μW

%/%

kHz

μs

Power Dissipation

Power Supply Sensitivity

DYNAMIC CHARACTERISTICS

5, 9

Bandwidth

Total Harmonic Distortion

Settling Time

Resistor Noise Density

Crosstalk (C

)

Analog Crosstalk

N_WB

20/64

90/21

−81/−62

nV/√Hz

nV-s

Typicals represent average readings at 25°C and V

= 5 V.

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 change from ideal between successive tap positions. I

~ 50 μA for V

= 2.7 V and I

~ 400 μA for V

= 5 V (see Figure 25).

INL and DNL are measured at V

with the RDAC configured as a potentiometer divider similar to a voltage output DAC. V

= V

and V

= V

. DNL specification limits of

±1 LSB maximum are guaranteed monotonic operating conditions (see Figure 26).

Resistor Terminal A, Resistor Terminal B, and Resistor Terminal W have no limitations on polarity with respect to each other. Dual-supply operation enables ground-

referenced bipolar signal adjustment.

Guaranteed by design and not subject to production test.

Common-mode leakage current is a measure of the dc leakage from any Terminal A, Terminal B, or Terminal W to a common-mode bias level of V

/2.

EEMEM restore mode current is not continuous. Current is consumed while EEMEM locations are read and transferred to the RDAC register (see Figure 22). To

minimize power dissipation, a NOP, Instruction 0 (0x0) should be issued immediately after Instruction 1 (0x1).

DISS

is calculated from (I

× V

) + (I

× V

All dynamic characteristics use V

= +2.5 V and V

= −2.5 V.

Rev. C | Page 4 of 28

型号	AD5235BRUZ25	AD5235BRU25	AD5235BRU250-RL7	AD5235BRU25-RL7	AD5235BRUZ250
描述	DUAL 25K DIGITAL POTENTIOMETER, 3-WIRE SERIAL CONTROL INTERFACE, 1024 POSITIONS, PDSO16, ROHS COMPLIANT, MO-153AB, TSSOP-16	DUAL 25K DIGITAL POTENTIOMETER, 3-WIRE SERIAL CONTROL INTERFACE, 1024 POSITIONS, PDSO16, MO-153AB, TSSOP-16	DUAL 250K DIGITAL POTENTIOMETER, 3-WIRE SERIAL CONTROL INTERFACE, 1024 POSITIONS, PDSO16, MO-153AB, TSSOP-16	DUAL 25K DIGITAL POTENTIOMETER, 3-WIRE SERIAL CONTROL INTERFACE, 1024 POSITIONS, PDSO16, MO-153AB, TSSOP-16	DUAL 250K DIGITAL POTENTIOMETER, 3-WIRE SERIAL CONTROL INTERFACE, 1024 POSITIONS, PDSO16, ROHS COMPLIANT, MO-153AB, TSSOP-16
是否无铅	不含铅	含铅	含铅	含铅	不含铅
是否Rohs认证	符合	不符合	不符合	不符合	符合
零件包装代码	TSSOP	TSSOP	TSSOP	TSSOP	TSSOP
包装说明	TSSOP,	MO-153AB, TSSOP-16	TSSOP,	TSSOP,	TSSOP,
针数	16	16	16	16	16
Reach Compliance Code	unknown	unknown	unknown	unknown	unknown
其他特性	LINEAR OR LOG TAPER SETTINGS; NONVOLATILE MEMORY; CAN ALSO OPERATE FROM +/-2.25V TO +/-2.75V SUPPLY	LINEAR OR LOG TAPER SETTINGS; NONVOLATILE MEMORY; CAN ALSO OPERATE FROM +/-2.25V TO +/-2.75V SUPPLY	LINEAR OR LOG TAPER SETTINGS; NONVOLATILE MEMORY; CAN ALSO OPERATE FROM +/-2.25V TO +/-2.75V SUPPLY	LINEAR OR LOG TAPER SETTINGS; NONVOLATILE MEMORY; CAN ALSO OPERATE FROM +/-2.25V TO +/-2.75V SUPPLY	LINEAR OR LOG TAPER SETTINGS; NONVOLATILE MEMORY; CAN ALSO OPERATE FROM +/-2.25V TO +/-2.75V SUPPLY
标称带宽	0.125 kHz	0.125 kHz	0.125 kHz	0.125 kHz	0.125 kHz
控制接口	3-WIRE SERIAL	3-WIRE SERIAL	3-WIRE SERIAL	3-WIRE SERIAL	3-WIRE SERIAL
转换器类型	DIGITAL POTENTIOMETER	DIGITAL POTENTIOMETER	DIGITAL POTENTIOMETER	DIGITAL POTENTIOMETER	DIGITAL POTENTIOMETER
JESD-30 代码	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16
JESD-609代码	e3	e0	e0	e0	e3
长度	5 mm	5 mm	5 mm	5 mm	5 mm
湿度敏感等级	3	1	NOT APPLICABLE	NOT APPLICABLE	3
功能数量	2	2	2	2	2
位置数	1024	1024	1024	1024	1024
端子数量	16	16	16	16	16
最高工作温度	85 °C	85 °C	85 °C	85 °C	85 °C
最低工作温度	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C
封装主体材料	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
封装代码	TSSOP	TSSOP	TSSOP	TSSOP	TSSOP
封装形状	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
封装形式	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）	260	240	220	220	260
认证状态	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL
电阻定律	LOGARITHMIC	LOGARITHMIC	LOGARITHMIC	LOGARITHMIC	LOGARITHMIC
最大电阻容差	30%	30%	30%	30%	30%
最大电阻器端电压	5 V	5 V	5 V	5 V	5 V
座面最大高度	1.2 mm	1.2 mm	1.2 mm	1.2 mm	1.2 mm
标称供电电压	5 V	5 V	5 V	5 V	5 V
表面贴装	YES	YES	YES	YES	YES
标称温度系数	35 ppm/°C	35 ppm/°C	35 ppm/°C	35 ppm/°C	35 ppm/°C
温度等级	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL
端子面层	MATTE TIN	TIN LEAD	TIN LEAD	TIN LEAD	MATTE TIN
端子形式	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING
端子节距	0.65 mm	0.65 mm	0.65 mm	0.65 mm	0.65 mm
端子位置	DUAL	DUAL	DUAL	DUAL	DUAL
处于峰值回流温度下的最长时间	40	30	30	30	40
标称总电阻	25000 Ω	25000 Ω	250000 Ω	25000 Ω	250000 Ω
宽度	4.4 mm	4.4 mm	4.4 mm	4.4 mm	4.4 mm
Base Number Matches	1	1	1	1	-

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