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Low Noise, Low Power X9015 Digitally-Controlled Potentiometer FEATURES * * * * * * * 32 Taps Three-wire Up/Down Serial Interface VCC = 2.7V & 5V Operating ICC = 50A Max. Standby current = 1A Max. RTOTAL = 50K Packages, SOIC-8 DESCRIPTION The Xicor X9015 is a 32 tap potentiometer that is volatile. The device consists of a string of 31 resistors that can be programmed to connect the RW/VW wiper output with any of the nodes between the connecting resistors. The connection point of the wiper is determined by information communicated to the device on the 3-wire port. The 3-wire port changes the tap position by a falling edge on the increment pin. Direction the wiper moves is determined by the state of the Up/Down pin. The wiper position at power up is tap #15. The X9015 can be used in a wide variety of applications that require a digitally controlled variable resistor to set analog values. FUNCTIONAL DIAGRAMS VCC (Supply Voltage) U/D INC CS 5-BIT UP/DOWN COUNTER 31 30 29 28 ONE OF THIRTY TWO DECODER RH/VH UP/DOWN (U/D) INCREMENT (INC) DEVICE SELECT (CS) CONTROL RH/VH RW/VW TRANSFER GATES RL/VL 2 VSS (Ground) GENERAL VCC VSS CONTR OL CIRCUITRY 1 0 RESISTOR ARRAY RL/VL RW/VW DETAILED 9900-2009.3 9/20/99 PS 1 Characteristics subject to change without notice X9015 PIN DESCRIPTIONS RH/VH and RL/VL The high (RH/VH) and low (RL/VL) terminals of the X9015 are equivalent to the fixed terminals of a mechanical potentiometer. The minimum voltage is VSS and the maximum is VCC. The terminology of RL/VL and RH/VH references the relative position of the terminal in relation to wiper movement direction selected by the U/D input and not the voltage potential on the terminal. RW/VW RW/Vw is the wiper terminal and is equivalent to the movable terminal of a mechanical potentiometer. The position of the wiper within the array is determined by the control inputs. The wiper terminal series resistance is typically 200 at VCC = 5V. At power up the wiper position is at tap #15 (VL/RL = tap #0). Up/Down (U/D) The U/D input controls the direction of the wiper movement and whether the tap postion is incremented or decremented. Increment (INC) The INC input is negative-edge triggered. Toggling INC will move the wiper and either increment or decrement the counter in the direction indicated by the logic level on the U/D input. Chip Select (CS) The device is selected when the CS input is LOW. When CS is returned HIGH while the INC input is LOW the X9015 will be placed in the low power standby mode until the device is selected once again. PIN CONFIGURATION SOIC INC U/D RH/VH VSS 1 2 3 4 X9015 8 7 6 5 VCC CS RL/VL RW/VW PIN NAMES Symbol RH/VH RW/VW RL/VL VSS VCC U/D INC CS Description High Terminal Wiper Terminal Low Terminal Ground Supply Voltage Up/Down Control Input Increment Control Input Chip Select Control Input 2 X9015 PRINCIPLES OF OPERATION There are two sections of the X9015: the input control, counter and decode section; and the resistor array. The input control section operates just like an up/down counter. The output of this counter is decoded to turn on a single electronic switch connecting a point on the resistor array to the wiper output. The resistor array is comprised of 31 individual resistors connected in series. The wiper, when at either fixed terminal, acts like its mechanical equivalent and does not move beyond the last position. That is, the counter does not wrap around when clocked to either extreme. The electronic switches on the device operate in a "make before break" mode when the wiper changes tap positions. If the wiper is moved several positions, multiple taps are connected to the wiper for tIW (INC to VW change). The RTOTAL value for the device can temporarily be reduced by a significant amount if the wiper is moved several positions. When the device is powered-down, the wiper position is lost. When power is restored, the wiper is set to tap #15. INSTRUCTIONS AND PROGRAMMING The INC, U/D and CS inputs control the movement of the wiper along the resistor array. With CS set LOW the device is selected and enabled to respond to the U/D and INC inputs. HIGH to LOW transitions on INC will increment or decrement (depending on the state of the U/D input) a five bit counter. The output of this counter is decoded to select one of thirty two wiper positions along the resistive array. The system may select the X9015, move the wiper and deselect the device. The new wiper position will be maintained until changed by the system or until a powerup/down cycle. The state of U/D may be changed while CS remains LOW. This allows the host system to enable the device and then move the wiper up and down until the proper trim is attained. MODE SELECTION CS L L H X L INC U/D H L X X Wiper Up Mode Wiper Down Standby Current Return to standby SYMBOL TABLE WAVEFORM INPUTS Must be steady May change from Low to High May change from High to Low Don't Care: Changes Allowed N/A OUTPUTS Will be steady Will change from Low to High Will change from High to Low Changing: State Not Known Center Line is High Impedance 3 X9015 ABSOLUTE MAXIMUM RATINGS* Temperature under Bias .........................-65C to +135C Storage Temperature..............................-65C to +150C Voltage on CS, INC, U/D, VH, VL and VCC with Respect to VSS.................................. -1V to +7V V = |VH-VL| ................................................................. 5V Lead Temperature (Soldering 10 seconds)............. 300C *COMMENT Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and the functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED OPERATING CONDITIONS Temperature Commercial Industrial Min. 0C -40C Max. +70C +85C Supply Voltage (VCC) X9015 X9015-2.7 Limits 5V 10% 2.7V to 5.5V POTENTIOMETER CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.) Limits Symbol RTOTAL VVH VVL Parameter End to End Resistance Variation VH Terminal Voltage VL Terminal Voltage Power Rating Min. -20 0 0 Typ. Max. +20 VCC VCC 10 Units % V V mW mA dBV % Test Conditions/Notes RTOTAL 50K IW = 1mA, VCC = 5V IW = 1mA, VCC = 2.7V RW RW IW Wiper Resistance Wiper Resistance Wiper Current Noise Resolution Absolute Linearity (1) 200 400 400 1000 1 -120 3 -1 -0.2 300 20 10/10/25 +1 +0.2 Ref: 1kHz Vw(n)(actual) - Vw(n)(expected) Vw(n+1) - [Vw(n)+MI] MI(3) MI(3) ppm/C ppm/C pF Relative Linearity(2) RTOTAL Temperature Coefficient Ratiometric Temperature Coefficient CH/CL/CW Notes: Potentiometer Capacitances See circuit #3 (1) Absolute Linearity is utilized to determine actual wiper voltage versus expected voltage = (Vw(n)(actual) - Vw(n)(expected)) = 1 Ml Maximum. (2) Relative Linearity is a measure of the error in step size between taps = VW(n+1) - [Vw(n) + Ml] = 0.2 Ml. (3) 1 Ml = Minimum Increment = RTOT/31. (4) Typical values are for TA = 25C and nominal supply voltage. (5) This parameter is periodically sampled and not 100% tested. 4 X9015 D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.) Limits Symbol ICC1 ISB ILI VIH VIL CIN(5) Parameter VCC Active Current (Increment) Standby Supply Current CS, INC, U/D Input Leakage Current CS, INC, U/D Input HIGH Voltage CS, INC, U/D Input LOW Voltage CS, INC, U/D Input Capacitance Min. Typ.(4) Max. 50 1 10 Units A A A V V pF Test Conditions CS = VIL, U/D = VIL or VIH and INC = 0.4V @ max. tCYC CS = VCC - 0.3V, U/D and INC = VSS or VCC - 0.3V VIN = VSS to VCC VCC x 0.7 -0.5 VCC + 0.5 VCC x 0.1 10 VCC = 5V, VIN = VSS, TA = 25C, f = 1MHz Test Circuit #1 Test Circuit #2 VH/RH TEST POINT Circuit #3 SPICE Macromodel RTOTAL RH CH CW 25pF 10pF RW CL 10pF RL VH/RH VS TEST POINT VW/RW VL/RL VL /RL L VW VW/RW FORCE CURRENT 5 X9015 A.C. CONDITIONS OF TEST Input Pulse Levels Input Rise and Fall Times Input Reference Levels 0V to 3V 10ns 1.5V A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified) Limits Symbol tCl tlD tDI tlL tlH tlC tCPH tIW tCYC tR, tF(7) tPU(7) tR VCC(7) CS to INC Setup INC HIGH to U/D Change U/D to INC Setup INC LOW Period INC HIGH Period INC Inactive to CS Inactive CS Deselect Time INC to Vw Change INC Cycle Time INC Input Rise and Fall Time Power up to Wiper Stable VCC Power-up Rate 0.2 4 500 5 50 Parameter Min. 100 100 2.9 1 1 1 100 Typ.(6) Max. Units ns ns s s s s ns 1 5 s s s s V/ms A.C. TIMING CS tCYC tCI INC tID tDI tF tIL tIH tIC (Stand by) tCPH 90% 90% 10% tR U/D tIW VW MI (8) Notes: (6) Typical values are for TA = 25C and nominal supply voltage. (7) This parameter is periodically sampled and not 100% tested. (8) MI in the A.C. timing diagram refers to the minimum incremental change in the VW output due to a change in the wiper position. 6 X9015 PERFORMANCE CHARACTERISTICS (TYPICAL) TYPICAL NOISE 0 -10 -20 -30 -40 -50 -60 Noise (dB) -70 -80 -90 -100 -110 -120 -130 -140 -150 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 Frequency (KHz) TYPICAL RTOTAL vs. TEMPERATURE 10000 9800 9600 9400 9200 Rtotal 9000 8800 8600 8400 8200 8000 -55 -45 -35 -25 -15 -5 5 15 35 45 25 Temperature 55 65 75 85 95 105 115 125 C TYPICAL TOTAL RESISTANCE TEMPERATURE COEFFICIENT 0 -50 -100 -150 PPM -200 -250 -300 -350 -55 -45 -35 -25 -15 -5 5 15 25 35 45 Temperature 55 65 75 85 95 105 115 125 C 7 X9015 TYPICAL WIPER RESISTANCE 800 700 600 500 Rw (Ohms) 400 300 200 100 0 0 2 4 6 8 10 12 14 16 Tap 18 20 22 24 26 28 30 32 VCC = 2.7V TYPICAL ABSOLUTE % ERROR PER TAP POSITION 40.0% 30.0% 20.0% Absolute % Error 10.0% 0.0% -10.0% -20.0% -30.0% -40.0% 0 3 6 9 12 15 Tap 18 21 24 27 30 TYPICAL RELATIVE % ERROR PER TAP POSITION 20.0% 15.0% 10.0% Relative % Error 5.0% 0.0% -5.0% -10.0% -15.0% -20.0% 0 3 6 9 12 15 Tap 18 21 24 27 30 8 X9015 APPLICATIONS INFORMATION Electronic digitally-controlled (XDCP) potentiometers provide two powerful application advantages; (1) the variability and reliability of a solid-state potentiometer, and (2) the flexibility of computer-based digital controls. Basic Configurations of Electronic Potentiometers VR VH VW VL I Three terminal potentiometer; variable voltage divider Two terminal variable resistor; variable current VR Basic Circuits Buffered Reference Voltage R1 +V +5V VREF VW + - -5V VOUT = VW (a) (b) OP-07 VOUT +V R1 VW VO = (1+R2/R1)VS VW X Cascading Techniques +V +V Noninverting Amplifier +5V VS + - -5V R2 LM308A VO Voltage Regulator Offset Voltage Adjustment R1 VS 100K - + VO TL072 10K 10K 10K -12V R2 Comparator with Hysterisis VIN 317 R1 VO (REG) VS LT311A - + VO Iadj R2 VO (REG) = 1.25V (1+R2/R1)+Iadj R2 +12V VUL = {R1/(R1+R2)} VO(max) VLL = {R1/(R1+R2)} VO(min) (for additional circuits see AN115) 9 } R1 } R2 X9015 SOIC PACKAGING INFORMATION 8-LEAD PLASTIC SMALL OUTLINE GULL WING PACKAGE TYPE S 0.150 (3.80) 0.158 (4.00) PIN 1 INDEX 0.228 (5.80) 0.244 (6.20) PIN 1 0.014 (0.35) 0.019 (0.49) 0.188 (4.78) 0.197 (5.00) (4X) 7 0.053 (1.35) 0.069 (1.75) 0.050 (1.27) 0.004 (0.19) 0.010 (0.25) 0.010 (0.25) 0.020 (0.50) X 45 0.050" TYPICAL 0 - 8 0.0075 (0.19) 0.010 (0.25) 0.016 (0.410) 0.037 (0.937) 0.250" 0.050" TYPICAL FOOTPRINT 0.030" TYPICAL 8 PLACES NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 10 X9015 ORDERING INFORMATION X9015 X X X X VCC Limits Blank = 5V 10% -2.7 = 2.7V to 5.5V Temperature Range Blank = Commercial = 0C to +70C I = Industrial = -40C to +85C Package S = 8-Lead SOIC End to End Resistance U = 50K Physical Characteristics Marking Includes Manufacturer's Trademark Resistance Value or Code Date Code LIMITED WARRANTY Devices sold by Xicor, Inc. are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. Xicor, Inc. makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Xicor, Inc. makes no warranty of merchantability or fitness for any purpose. Xicor, Inc. reserves the right to discontinue production and change specifications and prices at any time and without notice. Xicor, Inc. assumes no responsibility for the use of any circuitry other than circuitry embodied in a Xicor, Inc. product. No other circuits, patents, licenses are implied. U.S. PATENTS Xicor products are covered by one or more of the following U.S. Patents: 4,263,664; 4,274,012; 4,300,212; 4,314,265; 4,326,134; 4,393,481; 4,404,475; 4,450,402; 4,486,769; 4,488,060; 4,520,461; 4,533,846; 4,599,706; 4,617,652; 4,668,932; 4,752,912; 4,829, 482; 4,874, 967; 4,883, 976. Foreign patents and additional patents pending. LIFE RELATED POLICY In situations where semiconductor component failure may endanger life, system designers using this product should design the system with appropriate error detection and correction, redundancy and back-up features to prevent such an occurence. Xicor's products are not authorized for use in critical components in life support devices or systems. 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 11 |
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