ad5231 Analog Devices, Inc., ad5231 Datasheet
ad5231
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ad5231 Summary of contents
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... RDAC wiper up or down, one step at a time. The ±6 dB step commands can be used to double or half the RDAC wiper setting. The AD5231 is available in a 16-lead TSSOP. The part is guaranteed to operate over the extended industrial temperature range of −40°C to +85°C. ...
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... AD5231 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Electrical Characteristics—10 kΩ, 50 kΩ, 100 kΩ Versions .. 3 Timing Characteristics—10 kΩ, 50 kΩ, 100 kΩ Versions ...... 5 Absolute Maximum Ratings............................................................ 7 ESD Caution.................................................................................. 7 Pin Configuration and Function Descriptions............................. 8 Typical Performance Characteristics ...
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... +2 25° 25° AD5231 Max Unit +1.8 LSB +0.2 LSB +20 % ppm/°C 100 Ω Ω 10 Bits +1 LSB +1.25 LSB +0.4 LSB ppm/° 1 μA V 0.8 ...
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... AD5231 Parameter POWER SUPPLIES Single-Supply Power Range Dual-Supply Power Range Positive Supply Current Negative Supply Current EEMEM Store Mode Current EEMEM Restore Mode Current 7 8 Power Dissipation 5 Power Supply Sensitivity 5, 9 DYNAMIC CHARACTERISTICS Bandwidth Total Harmonic Distortion V Settling Time W Resistor Noise Voltage 1 Typical values represent average readings at 25° ...
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... Rev Page Min Typ 0.1 25 140 140 100 100 = t = 2.5 ns (10 and timed AD5231 Max Unit CYC CYC ns 0. μs μ μs ...
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... AD5231 Timing Diagrams CLK CPOL = 1 HIGH OR LOW SDI t 8 SDO B24 RDY * NOT DEFINED, BUT NORMALLY LSB OF CHARACTER PREVIOUSLY TRANSMITTED. THE CPOL = 1 MICROCONTROLLER COMMAND ALIGNS THE INCOMING DATA TO THE POSITIVE EDGE OF THE CLOCK CLK 2 CPOL = 0 HIGH OR LOW SDI B23– ...
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... V − device reliability. ±20 mA ±2 mA ESD CAUTION −0 0 −40°C to +85°C 150°C −65°C to +150°C 260°C 20 sec to 40 sec 150°C/W 28°C/W (T max − T )/θ Rev Page AD5231 ...
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... Ready. Active-high open-drain output. Identifies completion of Instructions 10, and PR Nonvolatile Digital Output 2. ADDR = 0x1, data bit position D1. For example, to store O2 high, the data bit format is 0x310002 CLK 15 RDY 2 SDI AD5231 SDO TOP VIEW GND 5 (Not to Scale ...
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... Figure 10. (∆R /R )/∆T × 5.5V –40°C TO +85° 2.00V 128 256 384 512 640 768 CODE (Decimal) 6 Figure 11. (∆V /V )/∆T × AD5231 896 1024 = 10 kΩ AB 896 1024 = 0V SS 896 1024 ...
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... AD5231 2.7V 25° 128 256 384 512 640 CODE (Decimal) Figure 12. Wiper On Resistance vs. Code 5V/ 2.7V/ –1 –40 – TEMPERATURE (°C) Figure 13 ...
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... Rev Page EXPECTED VALUE MIDSCALE 100µs/DIV = 2. Code = 1010101010 5V/ 10kΩ 50kΩ 100kΩ TIME (µs) 4ms/DIV vs. Time when Storing Data to EEMEM DD AD5231 0.5V/DIV B 25 5V/DIV 5V/DIV 5V/DIV ...
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... AD5231 CS CLK SDI 2mA/DIV 4ms/DIV *SUPPLY CURRENT RETURNS TO MINIMUM POWER CONSUMPTION IF INSTRUCTION 0 (NOP) IS EXECUTED IMMEDIATELY AFTER INSTRUCTION 1 (READ EEMEM). Figure 24. I vs. Time when Restoring Data from EEMEM DD 100 5V/DIV 10 5V/DIV 1 5V/DIV 0.1 0.01 0 128 256 Figure 25. I Rev Page OPEN ...
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... Figure 33. Incremental On Resistance DUT W V GND CONNECT Figure 34. Common-Mode Leakage Current 200µ OUTPUT OR PIN 50pF 200µ and V (The diode bridge test OH OL AD5231 V OUT V OUT (MIN) (MAX) of 2.2 kΩ) PULL-UP ...
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... AD5231 THEORY OF OPERATION The AD5231 digital potentiometer is designed to operate as a true variable resistor replacement device for analog signals that remain within the terminal voltage range of V The basic voltage range is limited digital potentiometer wiper position is determined by the RDAC register contents. ...
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... The data bits (Dx) are the values that are loaded into the decoded register. The AD5231 has an internal counter that counts a multiple of 24 bits (a frame) for proper operation. For example, AD5231 works with a 48-bit word, but it cannot work properly with a 23-bit or 25-bit word ...
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... DD SS internal forward-biased diodes (see Figure 40). The ground pin of the AD5231 device is primarily used as a digital ground reference, which needs to be tied to the common ground of the PCB. The digital input control signals to the AD5231 must be referenced to the device ground pin (GND) and satisfy the logic level defined in the Specifications section ...
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... In Table 6, command bits are C0 to C3, address bits are A3 to A0, Data Bit D0 to Data Bit D9 are applicable to RDAC, and D0 to D15 are applicable to EEMEM. Table 6. AD5231 24-Bit Serial Data-Word MSB Command Byte 0 RDAC EEMEM Command instruction codes are defined in Table 7. ...
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... RDAC register and the wiper position for each right-shift 4 and 5 command execution contains an error only for odd numbers of bits. Even numbers of bits are ideal. The graph in Figure 42 shows plots of Log_Error [20 × log (error/code)] for the AD5231. For example, Code 3 Log_Error = 20 × log (0.5/3) = −15.56 dB, which is the worst case. The 10 plot of Log_Error is more significant at the lower codes ...
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... The patent-pending RDAC contains multiple strings of equal resistor segments with an array of analog switches that act as the wiper connection. The number of positions is the resolution of the device. The AD5231 has 1024 connection points, allowing it to provide better than 0.1% settability resolution. Figure 43 shows an equivalent structure of the connections among the three terminals of the RDAC ...
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... Each LSB of voltage is equal to the voltage applied across Terminals A–B divided by the 2 resolution of the potentiometer divider kΩ AB Because AD5231 can also be supplied by dual supplies, the general equation defining the output voltage ground for any given input voltages applied to Terminal A and Terminal ...
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... PROGRAMMING EXAMPLES The following programming examples illustrate a typical sequence of events for various features of the AD5231. See Table 7 for the instructions and data-word format. The instruction numbers, addresses, and data appearing at SDI and SDO pins are in hexadecimal format. Table 13. Scratchpad Programming SDI ...
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... Retention quantifies the ability of the Flash/EE memory to retain its programmed data over time. Again, the AD5231 has been qualified in accordance with the formal JEDEC Retention Lifetime Specification (A117 specific junction temperature (T = 55° ...
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... APPLICATIONS BIPOLAR OPERATION FROM DUAL SUPPLIES The AD5231 can be operated from dual supplies ±2.5 V, which enables control of ground referenced ac signals or bipolar operation. AC signals as high across Terminal A to Terminal B with output taken from Terminal W. See Figure 46 for a typical circuit connection. ...
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... OUT +5V +2.5VREF –2.5VREF TRIM GND V+ AD8552 ADR421 V– A1 –5V Figure 49. 10-Bit Bipolar DAC 10-BIT UNIPOLAR DAC Figure 50 shows a unipolar 10-bit DAC using AD5231. The buffer is needed to drive various leads. 5V AD5231 OUT GND AD8601 V– ...
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... RESISTANCE SCALING The AD5231 offers 10 kΩ, 50 kΩ, and 100 kΩ nominal resistance. For users who need lower resistance but want to maintain the number of adjustment steps, they can parallel multiple devices ...
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... RDAC CIRCUIT SIMULATION MODEL The internal parasitic capacitances and the external load dominates the ac characteristics of the RDACs. The −3 dB bandwidth of the AD5231BRU10 (10 kΩ resistor) measures 370 kHz at half scale when configured as a potentiometer divider. Figure 15 provides the large signal BODE plot charac- teristics ...
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... OUTLINE DIMENSIONS 0.15 0.05 ORDERING GUIDE Model R (kΩ) AB AD5231BRU10 10 AD5231BRU10-REEL7 10 1 AD5231BRUZ10 10 1 AD5231BRUZ10-REEL7 10 AD5231BRU50 50 AD5231BRU50-REEL7 50 1 AD5231BRUZ50 50 1 AD5231BRUZ50-REEL7 50 AD5231BRU100 100 AD5231BRU100-RL7 100 AD5231BRUZ100 1 100 1 AD5231BRUZ100-RL7 100 Pb-free part. 5.10 5.00 4. 4.50 6.40 4.40 BSC 4. PIN 1 1.20 MAX 0.20 0.09 8° 0.30 0.65 0° 0.19 SEATING BSC PLANE COPLANARITY ...
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... AD5231 NOTES Purchase of licensed 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, provided that the system conforms to the I ©2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners ...