Increment/Decrement Dual Digital Potentiometer AD5222 AD5222

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Increment/Decrement Dual Digital Potentiometer AD5222 AD5222

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FEATURES 128-Position, 2-Channel Potentiometer Replacement Very Power: Dual Supply Operation Single Supply Operation Increment/Decrement Count Control APPLICATIONS Stereo Channel Audio Level Control Mechanical Potentiometer Replacement Remote Incremental Adjustment Applications Instrumentation: Gain, Offset Adjustment Programmable Voltage-to-Current Conversion Line Impedance Matching
Increment/Decrement Dual Digital Potentiometer AD5222
AD5222
UP/DOWN COUNTER DECODE
MODE DACSEL UP/DOWN COUNTER DECODE
SELECT ENABLE
GENERAL DESCRIPTION
AD5222 provides dual channel, 128-position, digitally controlled variable-resistor (VR) device. This device performs same electronic adjustment function potentiometer variable resistor. These products were optimized instrument test equipment push-button applications. Choices between bandwidth power dissipation available result wide selection end-to-end terminal resistance values. AD5222 contains fixed resistors with wiper contacts that fixed resistor value point determined digitally controlled up/down counter. resistance between wiper either point fixed resistor provides constant resistance step size that equal end-to-end resistance divided number positions (e.g., STEP k/128 variable resistor offers true adjustable value resistance, between Terminal wiper, Terminal wiper. fixed A-to-B terminal resistance nominal temperature coefficient ppm/°C. chip select count direction control inputs variable resistor position. MODE determines whether both incremented together independently. With MODE logic zero, both wipers incremented DOWN without changing relative settings between wipers. Also, relative ratio between wipers preserved either wiper reaches resistor array. independent MODE (Logic only determined DACSEL changed. DACSEL (Logic changes RDAC These inputs, which control internal up/down counter, easily generated with
mechanical push-button switches other contact closure devices). This simple digital interface eliminates need microcontrollers front panel interface designs. AD5222 available surface-mount (SO-14) package. ultracompact solutions, selected models available thin TSSOP-14 package. parts guaranteed operate over extended industrial temperature range -40°C +85°C. 3-wire, SPI-compatible interface applications, AD5203/AD5204/AD5206, AD7376, AD8400/AD8402/ AD8403 products.
INCREMENT
DACSEL MODE
Figure Typical Push-Button Control Application
REV.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Analog Devices. Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Site: http://www.analog.com Fax: 781/326-8703 Analog Devices, Inc., 1999
AD5222-SPECIFICATIONS 3otherwise noted.) unless
10%, +VDD,
Typ1 Unit ppm/°C Bits ppm/°C
Parameter
Symbol
Condition
CHARACTERISTICS RHEOSTAT MODE (Specifications Apply VRs) R-DNL RWB, Resistor Differential Resistor Nonlinearity2 R-INL RWB, Nominal Resistor Tolerance VDD, Wiper Connect, 25°C Resistance Temperature Coefficient RAB/T VDD, Wiper Connect Wiper Resistance3 Nominal Resistance Match R/RO VDD, 25°C CHARACTERISTICS POTENTIOMETER DIVIDER MODE (Specifications Apply VRs) Resolution Integral Nonlinearity4 Differential Nonlinearity4 Voltage Divider Temperature Coefficient Code Full-Scale Error VWFSE Code Zero-Scale Error VWZSE Code RESISTOR TERMINALS Voltage Range Capacitance6 Capacitance6 Common-Mode Leakage DIGITAL INPUTS OUTPUTS Input Logic High Input Logic Input Current Input Capacitance6 POWER SUPPLIES Power Single-Supply Range Power Dual-Supply Range Positive Supply Current Negative Supply Current Power Dissipation Power Supply Sensitivity DYNAMIC CHARACTERISTICS6, Bandwidth RANGE VDD/SS RANGE PDISS BW_10K BW_50K BW_100K BW_1M THDW eN_WB
-0.5
MHz, Measured GND, Code MHz, Measured GND, Code 2.4/2.1
-2.5 +2.7
0.8/0.6 nVHz
0.002 0.05 1000 0.005
Total Harmonic Distortion Settling Time Resistor Noise Voltage
Code Code Code Code Error Band
INTERFACE TIMING CHARACTERISTICS (Applies Parts) Input Clock Pulsewidth tCH, Clock Level High Setup Time tCSS Rise Hold Time tCSH Clock Fall Setup Time tUDS Clock Fall Hold Time tUDH DACSEL Clock Fall Setup Time tDSS DACSEL Clock Fall Hold Time tDSH MODE Clock Fall Setup Time tMDS MODE Clock Fall Hold Time tMDH
NOTES 1Typicals represent average readings 25°C, 2Resistor position nonlinearity error R-INL deviation from ideal value measured between maximum resistance minimum resistance wiper positions. R-DNL measures relative step change from ideal between successive positions. Parts guaranteed monotonic. Figure test circuit. 3Wiper resistance measured models. 4INL measured with RDAC configured potentiometer divider similar voltage output converter. specification limits maximum guaranteed monotonic operating conditions. Figure test circuit. 5Resistor Terminals have limitations polarity with respect each other. 6Guaranteed design subject production test. DISS calculated from DD). CMOS logic level inputs result minimum power dissipation. 8Bandwidth, noise settling time dependent terminal resistance value chosen. lowest value results fastest settling time highest bandwidth. highest value results minimum overall power consumption. 9All dynamic characteristics 10See timing diagram location measured values. input control voltages specified with (10% timed from voltage level Switching characteristics measured using both Specifications subject change without notice.
REV.
AD5222
ABSOLUTE MAXIMUM RATINGS
25°C, unless otherwise noted)
ORDERING GUIDE Kilo Package Package Ohms Temperature Description Option 1,000 1,000 -40°C/+85°C -40°C/+85°C -40°C/+85°C -40°C/+85°C -40°C/+85°C -40°C/+85°C -40°C/+85°C -40°C/+85°C SO-14 TSSOP-14 SO-14 TSSOP-14 SO-14 TSSOP-14 SO-14 TSSOP-14 R-14 RU-14 R-14 RU-14 R-14 RU-14 R-14 RU-14
-0.3 Digital Input Voltage Operating Temperature Range -40°C +85°C Maximum Junction Temperature max) 150°C Storage Temperature -65°C +150°C Lead Temperature (Soldering, sec) 300°C Package Power Dissipation TA)/JA Thermal Resistance SOIC (SO-14) 158°C/W TSSOP-14 206°C/W
Model AD5222BR10 AD5222BRU10 AD5222BR50 AD5222BRU50 AD5222BR100 AD5222BRU100 AD5222BR1M AD5222BRU1M
AD5222 size mil, 3360 mil; 1.4224 1.524 2.1677 Contains 1503 transistors. Patent Number 5495245 applies.
FUNCTION DESCRIPTIONS
Name
tCSS tCSH
Description
tUDS
tUDH tDSS
DACSEL
tDSH tMDS
MODE
tMDH
Figure Detail Timing Diagram
Truth Table
Operation Wiper Increment Toward Terminal Wiper Decrement Toward Terminal Wiper Position Fixed
Common Mode (MODE moves both wipers together either DOWN resistor array without changing relative distance between wipers. Also, distance between both wipers preserved either reaches array. Independent Mode (MODE allows user control each RDAC individually: DACSEL sets RDAC1; DACSEL sets RDAC2.
Terminal RDAC Terminal RDAC Wiper RDAC DACSEL Negative Power Supply. Specified operation both -2.7 (Sum |VDD |VSS Wiper RDAC DACSEL Terminal RDAC Terminal RDAC Ground. MODE Common MODE Independent MODE DACSEL Select determines which wiper incremented Independent MODE DACSEL sets RDAC1, DACSEL sets RDAC2. UP/DOWN Direction Control. Serial Clock Input, Negative Edge Triggered. Chip Select Input, Active Low. When high, UP/DOWN counter disabled. Positive Power Supply. Specified operation both (Sum |VDD |VSS
CONFIGURATION
VIEW (Not Scale) DACSEL
AD5222
MODE
CAUTION (electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although AD5222 features proprietary protection circuitry, permanent damage occur devices subjected high energy electrostatic discharges. Therefore, proper precautions recommended avoid performance degradation loss functionality.
WARNING!
SENSITIVE DEVICE
REV.
AD5222-Typical Performance Characteristics
0.25 0.20 PERCENT NOMINAL END-TO-END RESISTANCE 0.15 R-DNL ERROR 0.10 0.05 -0.05 -0.10 -0.15 CODE Decimal -0.20 -0.25 CODE Decimal +15V -15V
Figure Wiper-To-End Terminal Resistance Code
Figure R-DNL Relative Resistance Step Position Change Code
VOLTAGE
R-INL ERROR
-0.2 100k -0.4 -0.6 -0.8 -1.0 CODE Decimal VERSION VERSION VERSION VERSION VDD/VSS 2.7V/0V
CURRENT
Figure Resistance Linearity Conduction Current
Figure R-INL Resistance Nonlinearity Error Code
UNITS 2.7V
VDD/VSS 2.7V/0V VERSION VERSION
FREQUENCY -0.2 -0.4 -0.6 -0.8 WIPER RESISTANCE -1.0 CODE Decimal VERSION
100k
VERSION
Figure Wiper Contact Resistance
Figure Potentiometer Divider Error Code
REV.
AD5222
POTENTIOMETER MODE TEMPCO ppm/ CODE Decimal VERSION VERSION VDD/VSS 2.7V/0V GAIN 100k 100k 764kHz 132kHz 64kHz 6.6kHz 100k OP42 +2.7V -2.7V DATA 50mV
100k
VERSION VERSION
FREQUENCY
Figure
Potentiometer Mode Tempco
Figure Gain Frequency
RHEOSTAT MODE TEMPCO ppm/ CODE Decimal VERSION VERSION VERSION 100k VERSION VDD/VSS 2.7V/0V
FILTER 22kHz 2.7V NOISE
TEST CIRCUIT FIGURE TEST CIRCUIT FIGURE
0.01
0.001 FREQUENCY 100k
Figure
Rheostat Mode Tempco
Figure Total Harmonic Distortion Plus Noise Frequency
NORMALIZED GAIN FLATNESS 0.1dB/DIV CODE GAIN TEST CIRCUIT FIGURE 100k FREQUENCY 100k
TEST CIRUIT 2.7V -2.7V 50mV DATA OP42
FREQUENCY 100k
Figure Gain Frequency Code
Figure Normalized Gain Flatness Frequency
REV.
AD5222
1200 5.5V CODE 3.3V CODE 5.5V CODE 3.3V CODE 5.5V 5.5V 1000 SUPPLY CURRENT
SUPPLY CURRENT
VDD/VSS 2.5V
2.5V
0.01
100k FREQUENCY 0.001 2.7V 2.7V INPUT LOGIC VOLTAGE
Figure Supply Current Clock Frequency
Figure Supply Current Input Logic Voltage
SWITCH RESISTANCE VDD/VSS 2.7V VDD/VSS 2.7V/0V 2.7V 2.7V
20mV/DIV
2V/DIV
VDD/VSS 5.5V/0V COMMON MODE Volts
Figure Incremental Wiper Contact Resistance
Figure Midscale Transition
LOGIC 2.7V 2.7V
SUPPLY CURRENT
20mV/DIV
5.5V VDD/VSS 0.01 2.7V 2.7V
2V/DIV
0.001
TEMPERATURE
Figure Supply Current Temperature
Figure Stereo Step Transition, Mode
REV.
Parametric Test Circuits-AD5222
1LSB V+/128
OP279
VOUT
Figure Potentiometer Divider Nonlinearity Error Test Circuit (INL, DNL)
Figure Inverting Programmable Gain Test Circuit
CONNECT
OP279
VOUT
Figure Resistor Position Nonlinearity Error (Rheostat Operation; R-INL, R-DNL)
Figure Noninverting Programmable Gain Test Circuit
VMS2
NOMINAL
+15V
OP42
VOUT
VMS1
[VMS1 MS2]/IW -15V
Figure Wiper Resistance Test Circuit
Figure Gain Frequency Test Circuit
-----
PSRR (dB) VMS% (%/%) ------- VDD%
0.1V CODE 0.1V
Figure Power Supply Sensitivity Test Circuit (PSS, PSRR)
Figure Incremental Resistance Test Circuit
REV.
AD5222
OPERATION
AD5222 provides 128-position, digitally-controlled, variable resistor (VR) device. Changing settings accomplished pulsing while active low. (UP/ DOWN) control input controls direction increment. When wiper hits resistor (Terminal additional pulses longer change wiper setting. wiper position immediately decoded wiper decode logic changing wiper resistance. Appropriate debounce circuitry required when push-button switches used control count sequence direction count. exact timing requirements shown Figure AD5222 powers centered wiper position, exhibiting nearly equal resistances
DACSEL
RDAC COUNTER
MODE
RDAC COUNTER
AD5222
UP/DOWN COUNTER DECODE
Figure Detailed Digital Logic Interface Circuit
MODE DACSEL UP/DOWN COUNTER DECODE
digital inputs (CS, U/D, CLK, MODE, DACSEL) protected with series input resistor parallel Zener structure shown Figure potentiometer terminal pins protected from shown Figure
LOGIC
SELECT ENABLE
Figure Equivalent Protection Digital Pins Figure Block Diagram
DIGITAL INTERFACING OPERATION
AD5222 contains push-button controllable interface. active inputs clock (CLK), up/down (U/D). While MODE, DACSEL pins control common updates individual updates. negative-edge sensitive input requires clean transitions avoid clocking multiple pulses into internal UP/DOWN counter register, Figure Standard logic families work well. mechanical switches used product evaluation flip-flop other suitable means should debounce them. When taken active low, clock begins increment decrement internal up/down counter, dependent upon state control pin. UP/DOWN counter value starts system power Each pulse will increment value internal counter until full-scale value reached, long logic high. taken logic low, counter will count down, stopping code (zero-scale). Additional clock pulses ignored when wiper either position position. detailed digital logic interface circuitry shown Figure
Figure Equivalent Protection Analog Pins
RDAC UP/DOWN CNTR DECODE
RNOMINAL/128
Figure AD5222 Equivalent RDAC Circuit
REV.
AD5222
PROGRAMMING VARIABLE RESISTOR Rheostat Operation
nominal resistance RDAC between Terminals available with values final three characters part number determine nominal resistance value, e.g., 100; nominal resistance (RAB contact points accessed wiper terminal, plus terminal contact. power resistance from wiper either Terminal approximately equal. Pulsing will increase resistance from wiper Terminal unit resistance, Figure resistance determined number pulses applied clock pin. Each segment internal resistor string nominal resistance value RAB/128, which becomes case AD5222BR10 product. Care should taken limit current flow between direct contact state (RWB code maximum value avoid degradation possible destruction internal switch contact. Like mechanical potentiometer RDAC replaces, totally symmetrical (see Figure resistance between wiper Terminal also produces digitally controlled resistance RWA. When these terminals used B-terminal should tied wiper. typical part-to-part distribution process-lotdependent having variation. change with temperature ppm/°C temperature coefficient.
temperature coefficient increases wiper programmed near B-terminal larger percentage contribution wiper contact switch resistance, which 0.5%/°C temperature coefficient. Figures show effect wiper contact resistance function code setting.
PROGRAMMING POTENTIOMETER DIVIDER Voltage Output Operation
digital potentiometer easily generates output voltage proportional input voltage applied given terminal. example connecting A-terminal B-terminal ground produces output voltage wiper which value starting zero volts less than Each voltage equal voltage applied across Terminals divided 128-position resolution potentiometer divider. general equation defining output voltage with respect ground given input voltage applied Terminals VW(D) D/128 represents current contents internal up/down counter. Operation digital potentiometer divider mode results more accurate operation over temperature. Here output voltage dependent ratio internal resistors absolute value, therefore, drift improves ppm/°C.
REV.
AD5222
OUTLINE DIMENSIONS
Dimensions shown inches (mm).
14-Lead Narrow Body SOIC (R-14)
0.3444 (8.75) 0.3367 (8.55) 0.1574 (4.00) 0.1497 (3.80)
14-Lead TSSOP (RU-14)
0.201 (5.10) 0.193 (4.90)
0.2440 (6.20) 0.2284 (5.80)
0.177 (4.50) 0.169 (4.30) 0.0196 (0.50) 0.0099 (0.25) 0.256 (6.50) 0.246 (6.25)
0.050 (1.27)
0.0688 (1.75) 0.0532 (1.35)
0.0098 (0.25) 0.0040 (0.10)
0.0192 (0.49) SEATING 0.0099 (0.25) 0.0138 (0.35) PLANE 0.0075 (0.19)
0.0500 (1.27) 0.0160 (0.41)
0.006 (0.15) 0.002 (0.05)
0.0433 (1.10)
SEATING PLANE
0.0256 (0.65)
0.0118 (0.30) 0.0075 (0.19)
0.0079 (0.20) 0.0035 (0.090)
0.028 (0.70) 0.020 (0.50)
-10-
REV.
PRINTED U.S.A.
C3715-8-10/99

Increment/Decrement Dual Digital Potentiometer AD5222 AD5222

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