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Cirrus Logic

CS5550 Datasheet Preview

CS5550 Datasheet

Low-cost A/D Converter

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CS5550
Two-channel, Low-cost A/D Converter
Features
z Power Consumption <12 mW
- with VD+ = 3.3 V
z Adjustable Input Range on AIN1±
z GND-referenced Signals with Single Supply
z On-chip 2.5 V Reference (25 ppm/°C typ)
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z Simple Three-wire Digital Serial Interface
z Power Supply Configurations
VA+ = +5 V; AGND = 0 V; VD+ = +3.3 V to +5 V
Description
The CS5550 combines two ∆Σ ADCs and a serial
interface on a single chip. The CS5550 has
on-chip functionality to facilitate offset and gain
calibration. The CS5550 features a bi-directional
serial interface for communication with a
microcontroller.
ORDERING INFORMATION:
CS5550-IS -40°C to +85°C
CS5550-ISZ -40°C to +85°C, Lead-free
24-pin SSOP
24-pin SSOP
VA+
RESET
VD+
AIN1+
AIN1-
+
10x,50x
-
4th Order ∆Σ
Modulator
AIN2+
AIN2-
+
10x
-
2nd Order ∆Σ
Modulator
Digital
Filter
Digital
Filter
Calibration
Registers
Config
Register
Output
Registers
Serial
Interface
CS
SDI
SDO
SCLK
INT
VREFIN
x1
VREFOUT
Voltage
Reference
AGND
Clock
Generator
XIN XOUT CPUCLK
DGND
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2005
(All Rights Reserved)
MAR ‘05
DS630F1




Cirrus Logic

CS5550 Datasheet Preview

CS5550 Datasheet

Low-cost A/D Converter

No Preview Available !

CS5550
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
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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
2 DS630F1


Part Number CS5550
Description Low-cost A/D Converter
Maker Cirrus Logic
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