Related Manuals for National Semiconductor ADC122S655
Summary of Contents for National Semiconductor ADC122S655
- Page 1 January 18, 2008 National Semiconductor Rev – 1.0/CS RoHS Compliant Evaluation Board User's Guide ADC122S655 Dual 12-Bit, 200 kSPS to 500 kSPS, Simultaneous Sampling A/D Converter...
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Page 2: Table Of Contents
Table of Contents 1.0 Introduction ..........................3 2.0 Board Assembly ........................4 3.0 Quick Start ..........................4 3.1 Stand-Alone Mode ....................4 3.2 Computer Mode ......................5 4.0 Functional Description......................6 4.1 Analog Input Signal ....................6 4.2 ADC Reference Circuitry...................6 4.3 SPI Interface ......................6 4.4 Power Supply Connections ..................7 5.0 Software Operation and Settings ...................7 6.0 Evaluation Board Specifications ....................9 7.0 Summary Tables of Test Points, Jumpers, and Connectors ..........9... -
Page 3: Introduction
1.0 Introduction The ADC122S655EB/RoHS Design Kit (consisting The latest version of the WaveVision 4 software of the ADC122S655 Evaluation Board and this should downloaded from User's Guide) is designed to ease evaluation and http://www.national.com/adc. design-in National Semiconductor Note: WaveVision software version 4.4 or higher ADC122S655 12-bit Analog-to-Digital Converter. -
Page 4: Board Assembly
R31 or R38, depending on which channel you R36 NS are using (match the source impedance with 4.99K resistors R31 or R38). To accurately evaluate the performance of the ADC122S655, the HEADER 6 B-VIN source must be better than 90dB THD. Figure 3: AC Coupled Input Configuration 5. -
Page 5: Computer Mode
2 & 3 and removing the external supply. 3. Connect the J6 header on the ADC122S655 evaluation board to the J7 WV4 serial 6. Place an 8 MHz crystal oscillator into the connector on the WV4 board. Refer to Figure... -
Page 6: Functional Description
The CSB pin may be monitored at VIA5 or pin 1 of sources. To accurately evaluate the performance J6. In computer mode, the CSB is provided by the of the ADC122S655, the source must be better WV4 board. In manual mode, the CSB should be than -90dBc THD. -
Page 7: Power Supply Connections
• for +4.5V - I = 9mA • for +5.5V - I = 11mA Note: A majority of this current is for powering devices external to the ADC122S655. When operating in the computer mode, the supply voltage for V can be applied externally or supplied directly by the WV4 board through J6. - Page 8 Figure 8: Software Histogram To view an FFT of the data captured, click on the ‘FFT’ tab. This plot may be zoomed in on the data plot. display dynamic performance parameters in the form of SINAD, SNR, THD, SFDR and ENOB will be displayed at the top right hand corner of the FFT plot (Figure 9).
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Page 9: Evaluation Board Specifications
6 pin male header: Differential input for A and B. J6: WV4S 14 pin dual row right angle male header: Connects to WV4 board. Selection Jumpers on the ADC122S655 Evaluation Board (Refer to table 1 in Section 4.0 for configuration details) JP8: VREF SELECT Selects reference source for V... -
Page 10: Hardware Schematic
8.0 Hardware Schematic Figure 10: ADC122S655 Evaluation Board Schematic http://www.national.com... -
Page 11: Board Layouts
9.0 Evaluation Board Layers Figure 11: ADC122S655 Evaluation Board: All Layers with Silk Screen Figure 12: ADC122S655 Evaluation Board: Top Layer Figure 13: ADC122S655 Evaluation Board: Bottom Layer http://www.national.com... -
Page 12: Evaluation Board Bill Of Materials
Digikey 5003K-ND 5P0V_REM TP13,TP16,TP17 TP_500X/40/W_CASE Digikey 5011K-ND AGND TP14 TP_500X/40/W_CASE Digikey 5003K-ND 3P3V TP15 TP_500X/40/W_CASE Digikey 5003K-ND CLK_IN sm/sot23-5 LM4132-2.5 ADC122S655- SOG.50M/10/WG4.80/L3.00 MSOP10 sog.050/8/wg.244/l.200 24C02 VIA5 tp_37/60 Digikey VIA6 tp_37/60 Digikey SCLK VIA7 tp_37/60 Digikey DOUT crystal_socket Digikey A400-ND (THROUGH- HOLE) http://www.national.com... - Page 13 REFUND OF THE PURCHASE PRICE PAID, IF ANY. The ADC122S655 Evaluation Board is intended for product evaluation purposes only and is not intended for resale to end consumers, is not authorized for such use and is not designed for compliance with European EMC Directive 89/336/EEC, or for compliance with any other electromagnetic compatibility requirements.
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Page 14: Important Notice
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.