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CS5501-SD Datasheet(PDF) 1 Page - Cirrus Logic |
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CS5501-SD Datasheet(HTML) 1 Page - Cirrus Logic |
1 / 54 page 1 Copyright © Cirrus Logic, Inc. 1997 (All Rights Reserved) Cirrus Logic, Inc. Crystal Semiconductor Products Division P.O. Box 17847, Austin, Texas 78760 (512) 445 7222 FAX: (512) 445 7581 http://www.crystal.com CS5501 CS5503 Low-Cost, 16 & 20-Bit Measurement A/D Converter Features l Monolithic CMOS ADC with Filtering - 6-Pole, Low-Pass Gaussian Filter l Up to 4 kHz Output Word Rates - On Chip Self-Calibration Circuitry - Linearity Error: ±0.0003% - Differential Nonlinearity: CS5501: 16-Bit No Missing Codes (DNL ±1/8 LSB) CS5503: 20-Bit No Missing Codes l System Calibration Capability l Flexible Serial Communications Port - µC-Compatible Formats - 3-State Data and Clock Outputs - UART Format (CS5501 only) l Pin-Selectable Unipolar/Bipolar Ranges l Low Power Consumption: 25 mW - 10 µW Sleep Mode for Portable Applications l Evaluation Boards Available Description The CS5501 and CS5503 are low-cost CMOS A/D con- verters ideal for measuring low-frequency signals representing physical, chemical, and biological process- es. They utilize charge-balance techniques to achieve 16-bit (CS5501) and 20-bit (CS5503) performance with up to 4 kHz word rates at very low cost. The converters continuously sample at a rate set by the user in the form of either a CMOS clock or a crystal. On- chip digital filtering processes the data and updates the output register at up to a 4 kHz rate. The converters’ low- pass, 6-pole Gaussian response filter is designed to al- low corner frequency settings from 0.1 Hz to 10 Hz in the CS5501 and 0.5 Hz to 10 Hz in the CS5503. Thus, each converter rejects 50 Hz and 60 Hz line frequencies as well as any noise at spurious frequencies. The CS5501 and CS5503 include on-chip self-calibra- tion circuitry which can be initiated at any time or temperature to insure offset and full-scale errors of typi- cally less than 1/2 LSB for the CS5501 and less than 4 LSB for the CS5503. The devices can also be applied in system calibration schemes to null offset and gain er- rors in the input channel. Each device’s serial port offers two general purpose modes of operation for direct interface to shift registers or synchronous serial ports of industry-standard micro- controllers. In addition, the CS5501’s serial port offers a third, UART-compatible mode of asynchronous communication. ORDERING INFORMATION See page 33. I Calibration CAL AIN AGND DGND BP/UPSLEEP SRAM SC1 SC2 Calibration Microcontroller Analog Modulator 6-Pole Gaussian Low-Pass Digital Filter Charge-Balanced A/D Converter Clock Generator Serial Interface Logic VA+ VA- VD+ VD- SDATA CLKOUTCLKIN DRDY CS MODESCLK VREF 10 9 8 5 12 11 4 13 14 7 15 6 20 2 3 18 16 1 19 MAR ‘95 DS31F2 |
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