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CS5461 Datasheet(PDF) 2 Page - Cirrus Logic |
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CS5461 Datasheet(HTML) 2 Page - Cirrus Logic |
2 / 46 page CS5461 2 DS546PP2 TABLE OF CONTENTS 1. GENERAL DESCRIPTION ....................................................................................................... 5 2. PIN DESCRIPTION ................................................................................................................... 6 3. CHARACTERISTICS/SPECIFICATIONS ................................................................................. 8 ANALOG CHARACTERISTICS ................................................................................................ 8 VOLTAGE REFERENCE........................................................................................................ 10 5 V DIGITAL CHARACTERISTICS......................................................................................... 11 3 V DIGITAL CHARACTERISTICS......................................................................................... 11 SWITCHING CHARACTERISTICS ........................................................................................ 12 3.1 Theory of Operation ......................................................................................................... 14 3.1.1 High-Rate Digital Low-Pass Filters ..................................................................... 14 3.1.2 Digital Compensation Filters ............................................................................... 14 3.1.3 Digital High-Pass Filters ...................................................................................... 14 3.1.4 Gain and DC Offset Adjustment .......................................................................... 14 3.1.5 Average (Real) Power Computation ................................................................... 14 3.1.6 RMS Computations ............................................................................................. 15 3.2 Performing Measurements ............................................................................................... 15 3.3 CS5461 Linearity Performance ........................................................................................ 15 4. FUNCTIONAL DESCRIPTION ............................................................................................... 17 4.1 Analog Inputs ................................................................................................................... 17 4.2 Voltage Reference ........................................................................................................... 17 4.3 Oscillator Characteristics .................................................................................................17 4.4 Calibration ........................................................................................................................ 17 4.4.1 Overview of Calibration Process ......................................................................... 17 4.4.2 Calibration Sequence .......................................................................................... 18 4.4.3 Calibration Signal Input Level ............................................................................. 18 4.4.4 Calibration Signal Frequency .............................................................................. 18 4.4.5 Input Configurations for Calibrations ................................................................... 18 4.4.6 Description of Calibration Algorithms .................................................................. 19 4.4.6.1 AC Offset Calibration Sequence ......................................................... 19 4.4.6.2 DC Offset Calibration Sequence ......................................................... 19 4.4.6.3 AC Gain Calibration Sequence ........................................................... 19 4.4.6.4 DC Gain Calibration Sequence ........................................................... 20 4.4.7 Duration of Calibration Sequence ....................................................................... 20 4.4.8 Order of Calibration Sequences .......................................................................... 20 4.5 Power Offset .................................................................................................................... 21 4.6 Phase Compensation ....................................................................................................... 21 4.7 Time-Base Calibration ..................................................................................................... 21 4.8 On-Chip Temperature Sensor .......................................................................................... 22 4.9 Interrupt ........................................................................................................................... 22 4.9.1 Typical use of the INT pin ................................................................................... 22 4.9.2 INT Active State .................................................................................................. 22 4.10 Voltage Sag-Detect Feature .......................................................................................... 23 5. ENERGY PULSE OUTPUTS .................................................................................................. 24 5.1 Pulse-Rate Output (EOUT and EDIR) ............................................................................. 24 5.2 Pulse Output for Normal Format, Stepper Motor Format and Mechanical Counter Format ............................................................................................................ 24 5.2.1 Normal Format .................................................................................................... 24 5.2.2 Mechanical Counter Format ................................................................................ 25 5.2.3 Stepper Motor Format ......................................................................................... 25 5.3 FOUT Pulse Output ......................................................................................................... 25 5.4 Anti-Creep for the Pulse Outputs ..................................................................................... 26 5.5 Design Examples ............................................................................................................. 26 |
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