Document
CS5529
16-bit, Programmable ∆Σ ADC with 6-bit Latch
Features
General Description
z Delta-sigma Analog-to-digital Converter
- Linearity Error: 0.0015%FS - Noise-free Resolution: 16-Bits
z 2.5 V Bipolar/Unipolar Buffered Input Range z 6-bit Output Latch z Eight Digital Filters
- Selectable Output Word Rates - Output Settles in One Conversion Cycle - 50/60 Hz ±3 Hz Simultaneous Rejection
z Simple Three-wire Serial Interface
- SPI™ and Microwire™ Compatible - Schmitt Trigger on Serial Clock (SCLK)
z System/Self-calibration with R/W Registers z Power Supply Configurations
- VA+ = +5 V; VA- = 0 V; VD+ = +3 V to +5 V - VA+ = +2.5 V; VA- = -2.5 V; VD+ = +3 V to +5 V - VA+ = +3.0 V; VA- = -3.0 V; VD+ = +3.0 V
z Low Power Consumption: 2.6 mW
The 16-bit CS5529 is a low-power, programmable ∆Σ ADC (Analog-to-Digital Converter), which includes coarse/fine charge buffers, a fourth-order ∆Σ modulator, a calibration microcontroller, a digital filter with programmable decimation rates, a 6-bit output latch, and a threewire serial interface. The ADC is designed to operate from single or dual analog supplies and a single digital supply.
The digital filter is programmable with output update rates between 1.88 Hz to 101 Sps. These output rates are specified for XIN = 32.768 kHz. Output word rates can be increased by approximately 3X by using XIN = 100 kHz. The filter is designed to settle to full accuracy for the selected output word rate in one conversion. When operated at word rates of 15 Sps or less, the filter rejects both 50 Hz and 60 Hz simultaneously.
Low power, single conversion settling time, programmable output rates, and the ability to handle negative input signals make this single- or dual-supply product an ideal solution for isolated and non-isolated applications.
ORDERING INFORMATION See page 29.
AIN+ AIN-
VREF+ VREF-
VA+ VA1X 1X
Differential 4th Order Delta-Sigma Modulator
Latch A0 A1 D0 D1 D2 D3
Calibration Memory
DGND
VD+
Digital Filter
Calibration Register
Calibration µC
Clock Gen.
Control Register
Output Register
XIN XOUT
CS SCLK SDI
SDO
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Copyright © Cirrus Logic, Inc. 2005 (All Rights Reserved)
AUG ‘05
DS246F5 1
CS5529
TABLE OF CONTENTS
CHARACTERISTICS & SPECIFICATIONS ........................................................ 4 ANALOG CHARACTERISTICS................................................................... 4 ANALOG CHARACTERISTICS................................................................... 5 5V DIGITAL CHARACTERISTICS .............................................................. 6 3 V DIGITAL CHARACTERISTICS ............................................................. 6 DYNAMIC CHARACTERISTICS ................................................................. 6 ABSOLUTE MAXIMUM RATINGS .............................................................. 7 SWITCHING CHARACTERISTICS ............................................................. 8
GENERAL DESCRIPTION ................................................................................ 10 Analog Input ............................................................................................. 10 Analog Input Model ............................................................................ 10 Voltage Reference Input Model .......................................................... 10 Serial Port ................................................................................................. 11 Command Register Descriptions ........................................................ 12 Serial Port Interface ........................................................................... 13 Serial Port Initialization ....................................................................... 15 System Initialization ........................................................................... 15 Configuration Register .............................................................................. 15 Latch Output Pins ............................................................................... 15 Power Consumption ........................................................................... 15 Output Word Rate .............................................................................. 16 Digital Filter ........................................................................................ 16 Clock Generator ................................................................................. 16 Reset System ..................................................................................... 16 Port Flag ............................................................................................. 17 Calibration .......................................................................................... 17 Calibration Registers ................................................................... 17 Offset Register ...................................................................... 17 Gain Register.