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| Cirrus Logic CS5560 ADC评估套件 | |||||
作者：Cirrus 文章来源：本站原创 点击数： 更新时间：2007-8-29  |
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The CS556x family of ΔΣ-based industrial A/D converters sets new industry performance standards, combining the higher-bandwidth, low-distortion performance of a SAR converter with high-resolution, low-noise performance. The breakthrough combination provides designers of precision instrumentation, such as industrial process controllers, laboratory instrumentation, medical instrumentation, and high-speed weighing systems, with a significantly higher level of measurement accuracy, lower noise and higher throughput. CS5560 Features Differential Analog Input On-chip Buffers for High Input Impedance Conversion Time = 20 S Settles in One Conversion Linearity Error = 0.0007% Signal-to-Noise = 110 dB 24 Bits, No Missing Codes Self-calibration:- Maintains accuracy over time & temperature. Simple three/four-wire serial interface Power Supply Configurations: Analog: +5V/GND; IO: +1.8V to +3.3V Analog: ±2.5V; IO: +1.8V to +3.3V Power Consumption: ADC Input Buffers On: 85 mW ADC Input Buffers Off: 70 mW  详细性能请见数据表: http://www.cirrus.com/en/pubs/proDatasheet/CS5560_A5.pdf The CDB5560-1 is a versatile tool designed for evaluating the functionality and performance of the CS5560 ADC (Analog-to-Digital Converter). The SPI serial port on the CDB5560-1 evaluation board is configured in Master mode and will start transmitting data after power-up upon reset. This evaluation board is designed to connect to your data capture system or will interface to the CapturePlus II data acquisition system available from Cirrus Logic. The CS5560 delta-sigma ADC produces fully settled conversions to full specified accuracy at 50 kSpsThis ability to produce fully settled conversions for every sample makes it suitable for converting multiplexed input signals. To help evaluate this feature, the CDB5560-1 includes two differential analog inputs multiplexed into the CS5560. The multiplexer can be switched at the CS5560 ADC sample speed and the ADC will produce fully settled conversion data for each input channel. 评估板CDB5560-1主要特性: Two Analog Input Channels Multiplexed to the CS5560 ADC Pre-configured to require a minimum number of external connections to your data acquisition system. All functionality accessible through the connector interface and board-level options. On-board 4.096 V Reference Pre-configured for Master mode SPI™ communication to a data capture system. 评估板CDB5560-1外形图:  The CDB5560-1 evaluation board has both analog and digital circuit sections. The analog section consists of the CS5560 ADC, two analog input signal buffers, controlled through a multiplexer, that condition the signals into the ADC, and a precision 4.096 V reference. The digital section consists of board operation configuration control signals, reset circuitry, an SPI™ serial port, a jumper connection for initiating ADC calibration, and an EEPROM for evaluation board identification. The evaluation board operates from +2.5V, -2.5V, +3.3V and communicates through an SPI™ serial port. Figure 1 illustrates the CDB5560-1 block diagram.  The CDB5560-1 evaluation board is designed to interface with a data acquisition system. To connect and configure the CDB5560-1 perform the following initialization procedure: 1. Verify that the power supplies are off. 2. Connect the power supplies to the CDB5560-1 as shown in Table 1 on page 7. 3. Verify that the power is off to the analog input signal & control signal sources. 4. Connect the analog input signal sources to the evaluation board per Table 2 on page 7 Verify from Table 3 on page 8 that the analog input channel selected is INPUT A. 5. Configure the CDB5560-1 by connecting the control signal sources to the evaluation board as shown in Table 3 on page 8. Apply logic-level inputs as required to override the resistor pull-ups/pull-downs. 6. Make connections to the SPI™ serial port connector as shown in Table 5 on page 9. The CS5560 ADC serial port is configured by default to operate in the SSC (Synchronous Self Clocking) mode. Refer to the CS5560 data sheet for more information on serial communication modes and signal timing. 7. Turn on the power supplies to the evaluation board. 8. Apply power to the signal source. 9. Press the Reset switch on the evaluation board. 10. The CS5560 ADCs SPI™ serial port should now be communicating data.       相关电路图请参阅: >http://www.cirrus.com/en/pubs/rdDatasheet/CDB5560-1_DB1.pdf |
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