Cirrus Logic CS5550 - Manual (Page 2)

CS5550
2 DS630F1
TABLE OF CONTENTS
1. PIN DESCRIPTION ................................................................................................................... 4
2. CHARACTERISTICS/SPECIFICATIONS ................................................................................. 5
ANALOG CHARACTERISTICS ................................................................................................ 5
VOLTAGE REFERENCE.......................................................................................................... 6
5 V DIGITAL CHARACTERISTICS........................................................................................... 7
3 V DIGITAL CHARACTERISTICS........................................................................................... 7
RECOMMENDED OPERATING CONDITIONS ....................................................................... 7
SWITCHING CHARACTERISTICS .......................................................................................... 8
2.1 Theory of Operation ......................................................................................................... 10
2.1.1 High-Rate Digital Low-Pass Filters ..................................................................... 10
2.1.2 Digital Compensation Filters ............................................................................... 10
2.1.3 Gain and Offset Adjustment ................................................................................ 10
2.2 Performing Measurements ............................................................................................... 10
2.3 CS5550 Linearity Performance ........................................................................................ 10
3. FUNCTIONAL DESCRIPTION ............................................................................................... 11
3.1 Analog Inputs ................................................................................................................... 11
3.2 Voltage Reference ........................................................................................................... 11
3.3 Oscillator Characteristics ................................................................................................. 11
3.4 Calibration ........................................................................................................................ 12
3.4.1 Overview of Calibration Process ......................................................................... 12
3.4.2 Calibration Sequence .......................................................................................... 12
3.4.3 Calibration Signal Input Level ............................................................................. 12
3.4.4 Input Configurations for Calibrations ................................................................... 12
3.4.5 Description of Calibration Algorithms .................................................................. 12
3.4.5.1 Offset Calibration Sequence ............................................................... 12
3.4.5.2 Gain Calibration Sequence ................................................................. 13
3.4.6 Duration of Calibration Sequence ....................................................................... 13
3.5 Interrupt ........................................................................................................................... 13
3.5.1 Typical use of the INT pin ................................................................................... 13
3.5.2 INT Active State .................................................................................................. 13
3.6 PCB Layout ...................................................................................................................... 14
4. SERIAL PORT OVERVIEW .................................................................................................... 15
4.1 Commands ....................................................................................................................... 15
4.2 Serial Port Interface ......................................................................................................... 18
4.3 Serial Read and Write ...................................................................................................... 18
4.3.1 Register Write ..................................................................................................... 18
4.3.2 Register Read ..................................................................................................... 18
4.4 System Initialization ......................................................................................................... 18
4.5 Serial Port Initialization .................................................................................................... 19
4.6 CS5550 Power States ...................................................................................................... 19
5. REGISTER DESCRIPTION .................................................................................................... 20
5.1 Configuration Register ...................................................................................................... 20
5.2 Offset Registers ................................................................................................................ 21
5.3 Gain Registers .................................................................................................................. 21
5.4 Cycle Count Register ........................................................................................................ 21
5.5 OUT1 and OUT2 Output Registers................................................................................... 22
5.6 FILT1, FILT2 Unsigned Output Register........................................................................... 22
5.7 Status Register and Mask Register .................................................................................. 22
5.8 Control Register ................................................................................................................ 23
6. PACKAGE DIMENSIONS ....................................................................................................... 24