National Semiconductor ADC122S655 User Manual Download Page 1 | Manualshive

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National

Semiconductor

January 18, 2008

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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Summary of Contents for ADC122S655

Page 1: ...National Semiconductor January 18 2008 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 ...

Page 2: ...tional 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 8 0 Hardware Schematic 10 9 0 Board Layouts 11 10 0 Evaluation Board Bill of Materials 12 ...

Page 3: ... BRD 4 1 or higher which connects to a personal computer through a USB port and runs WaveVision 4 software revision 4 4 or higher The latest version of the WaveVision 4 software should be downloaded from the web at http www national com adc Note WaveVision software version 4 4 or higher is required to evaluate this part with the WV4 Evaluation System The WaveVision 4 software operates under Micros...

Page 4: ...ation board may be used in the Stand Alone mode to capture data with a logic analyzer or third party equipment or it may be used in the Computer Mode with a WaveVision 4 Data Capture Board referenced throughout the remainder of this document as WV4 In both cases the data may be analyzed with the WaveVision 4 software 3 1 Stand Alone Mode Refer to Figure 1 for locations of test points and major com...

Page 5: ...er 5 Connect a clean analog not switching 5 0V power source with a 300mA current limit to power connector TP12 on the ADC board Ground pin TP13 and turn on the power Place a shorting jumper between pins 1 2 of JP11 to power the board LED D3 should be ON Note The evaluation board can also be powered directly from the WV4 board by placing a shorting jumper between pins 2 3 and removing the external ...

Page 6: ...valuation board includes the option of selecting a fixed 2 5V reference voltage VA or an external voltage as the reference voltage Select the 2 5V reference as VREF by shorting pins 2 3 of JP8 or select VA as VREF by shorting pins 1 2 of JP8 If it is desirable to provide an external reference voltage the jumper must be removed from JP8 and TP11 may be driven directly The recommended range for VREF...

Page 7: ...an be downloaded for free from National s web site at http www national com adc WaveVision software version 4 4 or later is required to evaluate this device with the WaveVision system To install this software follow the procedure in the WV4 Board User s Guide Once the software is installed run and set it up as follows 1 Connect the WV4 board to the host computer with a USB cable 2 From the WaveVis...

Page 8: ...of SINAD SNR THD SFDR and ENOB will be displayed at the top right hand corner of the FFT plot Figure 9 Typical values using a VREF 2 5V and a Vin 4 9 Vpp are SINAD 71 594 SNR 71 939 THD 82 767 SFDR 83 164 ENOB 11 6 Acquired data may be saved to a file Plots may also be exported as graphics See the Data Capture Board User s Guide for details Figure 8 Software Histogram Figure 9 FFT ...

Page 9: ...V test point Located at the middle right area of the board TP15 CLK_IN Input Clock Signal Located at the bottom right of the board TP16 AGND Ground Located at the bottom right of the board TP17 AGND Ground Located at the top middle of the board Connectors on the ADC122S655 Evaluation Board J3 A VIN and B VIN 6 pin male header Differential input for A and B J6 WV4S 14 pin dual row right angle male ...

Page 10: ...S 3P3V_M R26 NS R28 NS R27 NS R25 NS R31 NS B VBIAS VA R39 510 C27 0 1uF CLKSEND_M C39 NS C40 NS C37 NS C38 NS C19 10uF CLKSEND_M C20 0 1uF J3 HEADER 6 1 2 3 4 5 6 C23 0 1uF VA_M CLK SELECT OSC ENABLE TP16 AGND 1 TP15 CLK_IN 1 CLK_IN CSB 3P3V DOUT_M 3P3V 3P3V_M 5P0V_M U6 24C02 A0 1 A1 2 A2 3 GND 4 SDA 5 SCL 6 WP 7 VCC 8 CSB_M C24 10uF C29 0 1uF TP14 3P3V 1 3P3V_M 3P3V_M WV4S J6 WV4S 2 4 6 8 10 12 ...

Page 11: ... national com 11 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 ...

Page 12: ... S1011E 36 ND CLK SELECT 1 J3 blkcon 100 vh tm1sq w 100 6 Digikey S1011E 36 ND HEADER 6 1 J6 blkcon 2mm ra tm2oe w2mm 14 Digikey S5803 21 ND WV4S 4 R30 R34 R36 R40 sm r_0805 20 1 R32 sm r_0805 100 1 R39 sm r_0805 510 2 R41 R45 sm r_0805 51 1 R47 sm r_0805 200 1 TP11 TP_500X 40 W_CASE Digikey 5003K ND VREF 1 TP12 TP_500X 40 W_CASE Digikey 5003K ND 5P0V_REM 3 TP13 TP16 TP17 TP_500X 40 W_CASE Digikey...

Page 13: ...NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or systems which a are intended for surgical implant into the body or b support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in a significant injury to the user 2 A critical component...

Page 14: ...for use in safety critical applications such as life support where a failure of the TI product would reasonably be expected to cause severe personal injury or death unless officers of the parties have executed an agreement specifically governing such use Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications and acknowledge and agre...

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