ad5227 Analog Devices, Inc., ad5227 Datasheet
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ad5227 Summary of contents
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... POR WIPER MIDSCALE REGISTER Figure 1. The AD5227 is available in a compact thin SOT-23-8 (TSOT-8) Pb-free package. The part is guaranteed to operate over the automotive temperature range of −40°C to +105°C. Users who consider EEMEM potentiometers should refer to some recommendations in the Applications section. Table 1. Truth Table ...
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... AD5227 TABLE OF CONTENTS Electrical Characteristics ................................................................. 3 Interface Timing Diagrams ......................................................... 4 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Pin Configuration and Function Descriptions............................. 6 Typical Performance Characteristics ............................................. 7 Theory of Operation ...................................................................... 10 Programming the Digital Potentiometers............................... 10 Digital Interface .......................................................................... 11 Terminal Voltage Operation Range.......................................... 11 Power-Up and Power-Down Sequences.................................. 11 REVISION HISTORY Revision 0: Initial Version Layout and Power Supply Biasing ...
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... V DD 140 150 1 2.4 5.5 0 0.8 ±1 5 2.7 5.5 0 0.01 0.05 460 100 kΩ, 0. AD5227 Unit LSB LSB % ppm/°C Ω Ω Bits LSB LSB ppm/°C LSB LSB µ µA µW %/% kHz kHz kHz % µs nV/√Hz ...
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... AD5227 Parameter INTERFACE TIMING CHARACTERISTICS (applies to all parts Clock Frequency Input Clock Pulse Width CS to CLK Setup Time CS Rise to CLK Hold Time U/D to Clock Fall Setup Time 1 Typicals represent average readings at 25° Resistor position nonlinearity error, R-INL, is the deviation from an ideal value measured between the maximum resistance and the minimum resistance wiper positions ...
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... Exposure to absolute −40°C to +105°C maximum rating conditions for extended periods may affect 150°C device reliability. −65°C to +150°C 245°C 230°C/W Rev Page AD5227 ...
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... Wiper Terminal W. GND ≤ Resistor Terminal B. GND ≤ Chip Select. Active Low. Logic high signal can be higher than Positive Power Supply CLK AD5227 U TOP VIEW (Not to Scale) GND Figure 5. SOT-23-8 Pin Configuration ≤ ...
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... CODE (Decimal) Figure 9. DNL vs. Code vs. Temperature 5. 2.7V DD – TEMPERATURE (°C) Figure 10. Full-Scale Error vs. Temperature 5.5V DD – TEMPERATURE (°C) Figure 11. Zero-Scale Error vs. Temperature AD5227 –40°C +25°C +85°C +105° 100 100 ...
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... AD5227 1 0.1 –40 – TEMPERATURE (°C) Figure 12. Supply Current vs. Temperature 100kΩ 50kΩ 10kΩ AB 0.1 –40 – TEMPERATURE (°C) Figure 13. Nominal Resistance vs. Temperature 120 V = 2.7V DD 100 5. –40 – TEMPERATURE (°C) Figure 14 ...
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... 10kΩ 50kΩ 100kΩ CODE (Decimal) Figure 22. Maximum I vs. Code STEP N+1 STEP CH2 50.0mV M 400ns A CH2 60.0mV T 0.00000s Figure 23. Step Change Settling Time AD5227 10M ...
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... B terminal contact, assuming that one step. The direction is determined by the state pin. The change of R clock pulses, provided that the AD5227 has not reached its maximum or minimum scale. ∆R approximated as where the number of clock pulses. ...
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... Figure 30 illustrates the basic supply bypassing configuration for the AD5227. The ground pin of the AD5227 is a digital ground reference that should be joined to the common ground at a single point to minimize the digital ground bounce. ...
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... A terminal and vice versa. Signals A and pass through a quadrature decoder U2 that translates the phase difference between A and into compatible inputs for U3 AD5227. Therefore, when B leads A (clockwise), U2 provides the AD5227 with a logic high U/ D signal, and vice versa. U2 also filters noise, jitter, and other transients as well as debouncing the contact bounces generated by U1 ...
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... OUT C3 D1 compares the sampling output with the reference level and 10µF outputs either a high or low level to the AD5227 U/ D pin. The AD5227 then changes step at every clock cycle in the direction D2 indicated by the U/ D state. Although this circuit is not as elegant D3 as the one shown in Figure 36 self-contained, very easy to D4 design, and can adapt to various applications ...
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... Constantly biasing the potentiometer is a practical approach because most portable devices do not require detachable batteries for charging. Although the resistance setting of the AD5227 is lost when the battery needs to be replaced, this event occurs so infrequently that the inconvenience is minimal for most applications. ...
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... AD5227BUJZ100-RL7 100 −40°C to +105°C 2 AD5227BUJZ100-R2 100 −40°C to +105°C AD5227EVAL 10 1 The end-to-end resistance R is available in 10 kΩ, 50 kΩ, and 100 kΩ versions. The final three characters of the part number determine the nominal resistance value, AB for example, 10 kΩ ...
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... AD5227 NOTES © 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04419–0–3/04(0) Rev Page ...