Cirrus-logic CS5534-AS Manual de usuario

Copyright © Cirrus Logic, Inc. 2008(All Rights Reserved)http://www.cirrus.comCS5531/32/33/34-AS16-bit and 24-bit ADCs with Ultra-low-noise PGIAFeature

CS5531/32/33/34-AS10 DS289F5SWITCHING CHARACTERISTICS (VA+ = 2.5 V or 5 V ±5%; VA- = -2.5V±5% or 0 V; VD+ = 3.0 V ±10% or 5 V ±5%;DGND = 0 V; Levels:

CS5531/32/33/34-ASDS289F5 11CSSCLKMSBMSB-1LSBSDIt3t6t4 t5 t1t2Figure 1. SDI Write Timing (Not to Scale)CSSCLKMSB MSB-1LSBSDOt7t9t8t1t2Figure 2. SDO

CS5531/32/33/34-AS12 DS289F52. GENERAL DESCRIPTIONThe CS5531/32/33/34 are highly integrated ∆Σ An-alog-to-Digital Converters (ADCs) which usecharge-b

CS5531/32/33/34-ASDS289F5 13instrumentation amplifier is typically 1200 pAover -40°C to +85°C (MCLK=4.9152 MHz).The common-mode plus signal range

CS5531/32/33/34-AS14 DS289F52.1.4. No Offset DACAn offset DAC was not included in the CS553Xfamily because the high dynamic range of the con-verter e

CS5531/32/33/34-ASDS289F5 15instruct the converter to perform single or multipleconversions or calibrations with the converter inthe mode defined by o

CS5531/32/33/34-AS16 DS289F5caused an operational issue for customers because their start-up sequence includes writing a word (with RS=0) into the con

CS5531/32/33/34-ASDS289F5 172.2.2. Command Register Quick Reference D7(MSB) D6 D5 D4 D3 D2 D1 D00 ARA CS1 CS0 R/WRSB2 RSB1 RSB0BIT NAME VALUE FUNCTIO

CS5531/32/33/34-AS18 DS289F52.2.3. Command Register DescriptionsREAD/WRITE ALL OFFSET CALIBRATION REGISTERSFunction: These commands are used to acces

CS5531/32/33/34-ASDS289F5 19READ/WRITE INDIVIDUAL GAIN REGISTERFunction: These commands are used to access each gain register separately. CS1 - CS0 de

CS5531/32/33/34-AS2 DS289F5TABLE OF CONTENTS1. CHARACTERISTICS AND SPECIFICATIONS ...4ANALOG C

CS5531/32/33/34-AS20 DS289F5PERFORM CONVERSIONFunction: These commands instruct the ADC to perform either a single, fully-settled conversion or con-ti

CS5531/32/33/34-ASDS289F5 21PERFORM CALIBRATIONFunction: These commands instruct the ADC to perform a calibration on the physical input channel se-lec

CS5531/32/33/34-AS22 DS289F52.2.4. Serial Port InterfaceThe CS5531/32/33/34’s serial interface consists offour control lines: CS, SDI, SDO, SCLK. Fig

CS5531/32/33/34-ASDS289F5 232.2.5. Reading/Writing On-Chip RegistersThe CS5531/32/33/34’s offset, gain, configuration,and channel-setup registers are

CS5531/32/33/34-AS24 DS289F5ter is read. The on-chip registers are initialized tothe following default states:After reset, the RS bit should be writte

CS5531/32/33/34-ASDS289F5 25from VA+ and VA-. Their output voltage will belimited to the VA+ voltage for a logic 1 and VA-for a logic 0.2.3.7. Offset

CS5531/32/33/34-AS26 DS289F52.3.9. Configuration Register Descriptions PSS (Power Save Select)[31]0 Standby Mode (Oscillator active, allows quick pow

CS5531/32/33/34-ASDS289F5 27Filter Rate Select, FRS[19]0 Use the default output word rates.1 Scale all output word rates and their corresponding filte

CS5531/32/33/34-AS28 DS289F52.4.1. Channel-Setup Register Descriptions CS1-CS0 (Channel Select Bits) [31:30] [15:14]00 Select physical channel 1 (All

CS5531/32/33/34-ASDS289F5 29U/B (Unipolar / Bipolar) [22] [6]0 Select Bipolar mode.1 Select Unipolar mode.OL1-OL0 (Output Latch Bits) [21:20] [5:4]The

CS5531/32/33/34-ASDS289F5 3LIST OF FIGURESFigure 1. SDI Write Timing (Not to Scale)...

CS5531/32/33/34-AS30 DS289F52.5. CalibrationCalibration is used to set the zero and gain slope ofthe ADC’s transfer function. The CS5531/32/33/34offe

CS5531/32/33/34-ASDS289F5 312.5.4. Performing CalibrationsTo perform a calibration, the user must send a com-mand byte with its MSB = 1, its pointer

CS5531/32/33/34-AS32 DS289F52.5.6. System CalibrationFor the system calibration functions, the user mustsupply the converter’s calibration signals wh

CS5531/32/33/34-ASDS289F5 33crocontroller and the ADC, and may prematurelyhalt the calibration cycle.For maximum accuracy, calibrations should be per-

CS5531/32/33/34-AS34 DS289F5rial port returns to the command mode, where itwaits for a new command to be issued. The singleconversion mode will take l

CS5531/32/33/34-ASDS289F5 352.6.3. Examples of Using CSRs to Perform Conversions and CalibrationsAny time a calibration or conversion command isissue

CS5531/32/33/34-AS36 DS289F5offset calibration on physical channel 2 and SDOfalls to indicate that the calibration is complete. Toperform additional c

CS5531/32/33/34-ASDS289F5 372.8.1. Conversion Data Output DescriptionsCS5531/33 (16-BIT CONVERSIONS)CS5532/34 (24-BIT CONVERSIONS) Conversion Data Bi

CS5531/32/33/34-AS38 DS289F52.9. Digital FilterThe CS5531/32/33/34 have linear phase digital fil-ters which are programmed to achieve a range ofoutpu

CS5531/32/33/34-ASDS289F5 392.10. Clock GeneratorThe CS5531/32/33/34 include an on-chip invertingamplifier which can be connected with an externalcry

CS5531/32/33/34-AS4 DS289F51. CHARACTERISTICS AND SPECIFICATIONSANALOG CHARACTERISTICS (VA+, VD+ = 5 V ±5%; VREF+ = 5 V; VA-, VREF-, DGND = 0 V; MCL

CS5531/32/33/34-AS40 DS289F5tation amplifier used on these gain ranges achieveslower noise. OSC2VD+VA+VREF+VREF-DGNDVA -AIN1+SDISCLKS

CS5531/32/33/34-ASDS289F5 41OSC2VD+VA+VREF+VREF-DGNDVA -AIN1+SDISCLKSDOCS5532OSC1CS+2.5 VAnalogSupply0.1 µF0.1 µF+-17312AIN1-51591013111214166Optional

CS5531/32/33/34-AS42 DS289F5OSC2VD+VA+VREF+VREF-DGNDVA -AIN1+SDISCLKSDOCS5532OSC1CS10Ω+3 VAnalogSupply0.1 µF0.1 µF17312AIN1-51591013111214166OptionalC

CS5531/32/33/34-ASDS289F5 432.12. Getting StartedThis A/D converter has several features. From asoftware programmer’s prospective, what shouldbe done

CS5531/32/33/34-AS44 DS289F53. PIN DESCRIPTIONS Clock GeneratorOSC1; OSC2 - Master Clock.An inverting amplifier inside the chip is connected between

CS5531/32/33/34-ASDS289F5 45SDI - Serial Data Input.SDI is the input pin of the serial input port. Data will be input at a rate determined by SCLK. SD

CS5531/32/33/34-AS46 DS289F54. SPECIFICATION DEFINITIONSLinearity ErrorThe deviation of a code from a straight line which connects the two endpoints

CS5531/32/33/34-ASDS289F5 475. ORDERING INFORMATION6. ENVIRONMENTAL, MANUFACTURING, & HANDLING INFORMATION* MSL (Moisture Sensitivity Level) as

CS5531/32/33/34-AS48 DS289F57. PACKAGE DRAWINGSNotes: 1. “D” and “E1” are reference datums and do not included mold flash or protrusions, but do inc

CS5531/32/33/34-ASDS289F5 49Notes: 1. “D” and “E1” are reference datums and do not included mold flash or protrusions, but do include mold mismatch a

CS5531/32/33/34-ASDS289F5 5ANALOG CHARACTERISTICS (Continued) (See Notes 1 and 2.) Notes: 5. The voltage on the analog inputs is amplified by the PGI

CS5531/32/33/34-AS50 DS289F5RevisionsREVISION DATE CHANGESPP1 Jan 1999 Initial releasePP6 Sep 2004 Added lead-free devicesF1 Jul 2005 Updated with mos

CS5531/32/33/34-AS6 DS289F5ANALOG CHARACTERISTICS (Continued) (See Notes 1 and 2.)8. All outputs unloaded. All input CMOS levels.9. Power is specifie

CS5531/32/33/34-ASDS289F5 7TYPICAL RMS NOISE (nV), CS5531/32/33/34 (See notes 11, 12 and 13)Notes: 11. Wideband noise aliased into the baseband. Refer

CS5531/32/33/34-AS8 DS289F55 V DIGITAL CHARACTERISTICS (VA+, VD+ = 5 V ±5%; VA-, DGND = 0 V;See Notes 2 and 16.)3 V DIGITAL CHARACTERISTICS (TA = 25 °

CS5531/32/33/34-ASDS289F5 9DYNAMIC CHARACTERISTICS 17. The ADCs use a Sinc5 filter for the 3200 Sps and 3840 Sps output word rate (OWR) and a Sinc5 fi