ADC12EU050 40-50MSPS QFN10X10-68 CC1608-0603 CC3216-1206 CC3225-1210 CSX750FJC

Document Rev 0.2 for Evalualtion Board Rev 3.0 National Semiconductor Evaluation Board User's Guide ADC12EU050: Ultra-low Power,

November 2008 Document Rev 0.2 for Evalualtion Board Rev 3.0 National Semiconductor Evaluation Board User's Guide ADC12EU050 ADC12EU050: Ultra-low Power, Octal, 12-bit, 40-50MSPS 40-50MSPS Sigma-Delta Analog-to-Digital Converter © 2008 National Semiconductor Corporation. 1 http://www.national.com Table of Contents 1.0 Introduction . 3 2.0 Board Assembly. 3 3.0 Quick Start. 3 4.0 Functional Description. 4 4.1 Analog Input. 4 4.2 ADC reference. 4 4.3 ADC input clock. 4 4.4 Power Supply Connections. 4 4.5 Reset. 5 4.6 Sleep. 5 4.7 Input Common Mode . 5 4.8 Default Jumper and Switch Settings . 5 5.0 Software and SPI Registers. 6 5.1 SPI Registers . 6 7.0 Hardware Schematic . 7 8.0 Evaluation Board Layout . 10 9.0 Evaluation Board Bill of Materials. 14 2 http://www.national.com frequency domain plot, shows dynamic performance in the form of SNR, SINAD, THD SFDR and ENOB. 1.0 Introduction This Evaluation Board is used to evaluate one of the A/D Converter ADC12EU050 ADC12EU050. The ADC is a 12 bit converter that provides data at a rate of 40 50 MHz. 2.0 Board Assembly The ADC12EU050 ADC12EU050 Evaluation Board comes preassembled. Refer to the Bill of Materials in Section 8 for a description of components, to Figure 1 for major component placement and to Section 6 for the Evaluation Board schematic. The evaluation board is designed to be used with the WaveVision5TM Data Capture Board which is connected to a personal computer through a USB port and running WaveVision5TM software, operating under Microsoft Windows. The software can perform an FFT on the captured data upon command and, in addition to a Input Clock circuitry Inputs ADC12EU050 ADC12EU050 WV5 Connector Hardware Reset Sleep Power Connectors Figure 1: Major Component Locations 4. 3.0 Quick Start Refer to Figure 1 for locations of jumpers, test points and major components. The board is configured by default to use an on board crystal clock source and internal reference. Refer to Section 4.0 for detailed information on jumper settings. You must have the WaveVision5TM software to test this board. You can download the latest version from the National Semiconductor website. 1. 2. 3. 5. 6. 7. Connect the WaveVision5TM board to the computer using a USB cable. Start the WaveVision5TM software. Connect a signal from a 50-Ohm source to connector a channel input. Be sure to use a bandpass filter before the Evaluation Board. Adjust the input signal amplitude as needed to ensure that the signal does not over-range by examinining an FFT of the output data with the WaveVisionTM software. Connect the ADC12EU050 ADC12EU050 evaluation board to the WaveVision5TM Data Capture Board. Apply power to the WaveVision5TM Data Capture Board. Connect power to the ADC12EU050 ADC12EU050 board as described in section 4.4, and power it up. 3 http://www.national.com 4.0 Functional Description The ADC12EU050 ADC12EU050 Evaluation Board schematic is shown in Section 6. A list of default switch and jumper settings can be found in section 4.10. 4.1 Analog Input The analog input is supplied through standard SMA connectors. The evaluation board is designed for single ended inputs, which are converted to differential by the transformers. It must be ensured that a high quality signal source is used so that the ADC dynamic performance can be properly evaluated. A bandpass filter on the input signal is highly recommended. The external clock amplitude and waveform are fairly flexible, but a 600mVpp differential square wave at the chip inputs is recommended. By changing the 0 ohm resistors R24, R25, R28 and R29 other clock input configurations can be realized. For example, a fully differential clock could be supplied, bypassing the on-board transformer. If a single ended clock is supplied to the ADC, then the LVDS termination resistor, R26, must be removed. 4.4 Power Supply Connections Power to the board is supplied through the power connectors P14, P16 and P18. The required voltages are shown in Figure 3 below, and described underneath. 4.2 ADC reference The ADC12EU050 ADC12EU050 can use an internal or external reference. This evaluation board is configured to use the internal reference. 4.3 ADC input clock +1.8V Digital Ground +1.2V Digital Ground +1.2V Analog Ground The ADC12EU050 ADC12EU050 can be clocked at 40-50MHz. The input clock circuit is shown in Figure 2 below. Figure 3: Power Supply Connectoins P14: Analog power and ground · ADC12EU050 ADC12EU050 analog supply, VA. · Connect VA to 1.2V, AGND to ground · Current can be measured across P13 P16: Digital power and ground · · A combination of 0 ohm resistors and a switch are used to select the path of the clock to the ADC. While not as convenient as pin-type jumpers, these introduce less noise into the clock signal. Connect VD to 1.2V, DRGND to ground · Figure 2: Input clock circuit. ADC12EU050 ADC12EU050 digital supply, VD. Current can be measured across P15 P18: Output driver power and ground · Connect VDR to 1.8V, DRGND to ground (same as DRGND of P16) · Selecting "External Clock" with switch S2 disables the onboard crystal oscillator. It enables the user to connect a single ended clock to P11. This clock is converted to a differential signal by the transformer T9. ADC12EU050 ADC12EU050 output driver supply, VDR. · Selecting "On Board Clock" with switch S2 enables an on board 50MHz crystal oscillator. The output of this oscillator is converted to differential by transformer T9 and routed to the CLK+ and CLK- input of the ADC. Current can be measured across P17 Generally, all grounds can be tied together, as can analog and digital supplies (VA and VD). The datasheet for the ADC12EU050 ADC12EU050 specifies that the output driver supply voltage (VDR) can be 1.2V or 1.8V. 4 http://www.national.com Due to the design of the evaluation system, specifically the distance from the ADC12EU050 ADC12EU050 to the Xilinx Virtex4 FPGA on the WaveVision5TM board and the connector through which the LVDS outputs are routed, VDR should be kept at 1.8V. A VDR of 1.2V can be used, but in this case the LVDS current drive (I_drive, SPI register 0x18, bits 3:2) must be increased to 5mA. 4.5 Reset The reset button pulls the RSTb pin of the ADC12EU050 ADC12EU050 low, resetting the ADC. The reset button only affects the ADC, not any other component on the board, or on the WaveVision5TM board. 4.6 Sleep The sleep switch puts the ADC input sleep mode, by connecting the SLEEP pin to VDR. 4.7 Input Common Mode Jumper P21 can be used to force a common mode on the ADC inputs. In its default configuration, the evaluation board has capacitively coupled ADC inputs, and using the Input Common Mode jumper will not have any effect. 4.8 Default Jumper and Switch Settings On delivery, the board's jumpers and switches should be set as defined in the table below. Any directions are defined when the board is positioned as in Figure 1. Jumper or Switch P2 P4 P13 P15 P17 P21 S2 S3 Default Position Open Closed Closed Closed Closed Open Left (On Board Clock) Left (Sleep mode not active) 5 http://www.national.com 5.0 Software and SPI Registers The ADC12EU050 ADC12EU050 evaluation board is designed to be used with the WaveVision5TM data capture board and software. The latest version of the WaveVision5TM software must be used. 5.1 SPI Registers As described in the ADC12EU050 ADC12EU050 datasheet, there are many user registers accessible via the SPI interface. These registers can all be programmed via the "Registers" tab in the WaveVision5TM software. All registers and values are described in the ADC12EU050 ADC12EU050 datasheet, which is available from the National Semiconductor website. 6 http://www.national.com 7.0 Hardware Schematic 7 http://www.national.com ADC12EU050 ADC12EU050 8 http://www.national.com 9 http://www.national.com 8.0 Evaluation Board Layout Layer 1 : Top 10 http://www.national.com Layer 2 : Internal Ground Plane 11 http://www.national.com Layer 3 : Internal Power Plane 12 http://www.national.com Layer 4 : Bottom 13 http://www.national.com 9.0 Evaluation Board Bill of Materials Designator *1 C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25, C26, C27, C29, C30, C31, C33, C34, C35, C36, C37, C38, C39, C40, C42, C43, C44, C46, C47, C48, C49, C51, C53, C55 Footprint QFN10X10-68 QFN10X10-68 Value ADC12EU050 ADC12EU050 CC1608-0603 CC1608-0603 100nF C28 CC3216-1206 CC3216-1206 10uF C32, C41, C45, C50, C52, C54 CC3225-1210 CC3225-1210 IC1 CSX750FJC CSX750FJC J1 HMZD_2PR_RA_HDR 47uF Citizen CSX750FJC50 CSX750FJC50.000MUT 000MUT HMZd Tyco Electronics part no 6469028-1 P1, P3, P5, P6, P7, P8, P9, P10, P11, P12 P2 SMA HDR2X3 P14, P16, P18 P4, P13, P15, P17, P21 LP2 HDR1X2 Header 2x3 Lumberg KRESS02 KRESS02 Terminal Block Header2x1 Q1 R33, R24, R25, R28, R29, R4, R8, R2, R3 R15 R13 R11, R36, R37, R38, R1, R21, R23 R6 R9, R12, R14, R16, R17, R18, R19, R22, R30, R31 R32, R5, R7, R10 R20, R34, R35 R26 R27 S1 SOT23 Description Quantity ADC 1 Capacitor (Semiconductor SIM Model) Capacitor (Semiconductor SIM Model) Capacitor (Semiconductor SIM Model) 48 1 6 Crystal Oscillator 1 HMZd Connector 60 pin RF Coaxial PCB Connector, MMCX; Thru-Hole, Vertical Mount Plug, 50 Ohm Impedance Header, 3-Pin, Dual row 1 10 1 4 4 BCW66H BCW66H Terminal Block Jumper Wire NPN General Purpose Transistor CR1608-0603 CR1608-0603 CR1608-0603 CR1608-0603 CR1608-0603 CR1608-0603 0 2K 4.7K Semiconductor Resistor Semiconductor Resistor Semiconductor Resistor 9 1 1 CR1608-0603 CR1608-0603 CR1608-0603 CR1608-0603 10K 33 Semiconductor Resistor Semiconductor Resistor 7 1 CR1608-0603 CR1608-0603 CR1608-0603 CR1608-0603 CR2012-0805 CR2012-0805 CR1005-0402 CR1005-0402 3296Y 3296Y PushButton 49.9 100 10K +/- 1% 100 25K OMRON B3S-1000 B3S-1000 10 4 3 1 1 1 S2 DIP-6 S3 T1, T2, T3, T4, T5, T6, T7, T8, T9 U1 SW-DIP1 Tyco ASE22 ASE22 EAO part no 09-0329001 Semiconductor Resistor Semiconductor Resistor Semiconductor Resistor Semiconductor Resistor Potentiometer Push Button Double-Pole, DoubleThrow Switch ADT1-6T DQFN_50M_16_2P5X3P5 Mini Circuits ADT1-6T FXL4TD245 FXL4TD245 U2 SOIC8_05_WG244 WG244_L200 M24C02-WMN6P M24C02-WMN6P 14 1 1 Single Switch 1 Transformer 4-bit level shifter EEPROM, STMicroelectronics, M24C02-WMN6P M24C02-WMN6P 9 1 http://www.national.com 1 BY USING THIS PRODUCT, YOU ARE AGREEING TO BE BOUND BY THE TERMS AND CONDITIONS OF NATIONAL SEMICONDUCTOR'S END USER LICENSE AGREEMENT. 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