ADC14155HFEB/NOPB

Evaluation Board User’s Guide for ADC14155W-MLS: 14-Bit, 155 MSPS Analog to Digital Converter www.national.com Rev 1.2 May 2011 ADC14155W-MLS Evaluation Board User’s Guide Analog Input FIN > 150 MHz Analog Input FIN < 150 MHz Analog Input Network ADC PD Jumper CLK_SEL/DF Jumper PLD MODE Jumper INV Jumper FutureBus Connector SingleEnded Clock Input 5.0 V Power Connector Figure 1. ADC14155 Evaluation Board and jumper locactions. The board shown is the ADC14155LCVAL, with the analog input network configured for opmtimum performance when input frequency is less than 150 MHz. The high speed board, ADC14155HCVAL, has a different analog input network, optimized for input frequencies greater than 150 MHz. -2- www.national.com Rev 1.2 ADC14155W-MLS Evaluation Board User’s Guide 1.0 Introduction 3.0 Quick Start The ADC14155 Evaluation Board is designed to support the ADC14155W-MLS 14-bit 155 Mega Sample Per Second (MSPS) Analog to Digital Converter. The ADC14155 evaluation board enables easy set up for evaluating the performance of the ADC14155. The ADC14155 Evaluation Board comes in two versions: 1. ADC14155HCVAL (high frequency version) for input frequencies greater than 150 MHz. 2. ADC14155LCVAL (low frequency version) for input frequencies less than 150 MHz. The digital data from the ADC14155 evaluation board can be captured with a suitable instrument, such as a logic analyzer, or with National Semiconductor’s WaveVision 5 data acquisition hardware and software platform. The ADC14155 evaluation board can be connected to the data acquisition hardware through the FutureBus connector (schematic reference designator FB). The ADC14155 evaluation board is compatible with National Semiconductor’s WaveVision 5 Digital Interface Board and WaveVision software. Please note that the ADC14155 evaluation board is not compatible with the WaveVision 4.x Digital Interface Boards. The WaveVision hardware and software package allows fast and easy data acquisition and analysis. The WaveVision hardware connects to a host PC via a USB cable and is fully configured and controlled by the latest WaveVision software. The latest WaveVision software is provided with the ADC14155 evaluation kit. The WaveVision data acquisition hardware is available through the National Semiconductor website (http://www.national.com/appinfo/adc/). 2.0 Board Assembly Each evaluation board from the factory is configured for single-ended clock operation and is populated with an analog input network which has been optimized for one of two analog input frequencies ranges: 1. ADC14155HCVAL (high frequency version) for input frequencies greater than 150 MHz. If the WaveVision data acquisition and data analysis system is to be used for capturing data, please follow the Quick Start Guide in the WaveVision User’s Guide to install the required software and to connect the WaveVision Digital Interface Board to the PC. Please note that the ADC14155 evaluation board is only compatible with National Semiconductor’s WaveVision 5 Digital Interface boards. 3.1 Evaluation Board Jumper Positions The ADC14155 evaluation board jumpers should be configured as follows. Please refer to Figure 1 for the exact jumper locations. 1. J1 solder jumper on the reverse of the board should be shorted. 2. The MODE solder jumper on the front of the board should be shorted and the INV solder jumper should be left open. See Section 4.4 for more detailed information regarding the function of the MODE and INV jumpers. 3. The PD pin jumper places the ADC14155 into either power-down or sleep mode. Table 1 below shows how to select between the power-down modes. PD Jumper Setting Open 1-2 3-4 Mode Normal Operation Power-down Sleep Table 1. PD/Sleep Selection Table 4. CLK_SEL/DF pin jumpers select the output data format (2’s complement or offset binary) and clock mode (single-ended or differential). Table 2 below shows how to select between the clock modes and output data formats. Please note that the ADC14155 evaluation board is delivered with the ADC14155 clock input configured for single-ended operation and Offset Binary output data format (Jumper 7-8). CLK_SEL/DF Jumper Setting 1-2 3-4 5-6 7-8* 2. ADC14155LCVAL (low frequency version) for input frequencies less than 150 MHz. Please refer to the input circuit configurations described in the Analog Input Section (4.2) of this guide. Clock Mode Output Data Format Differential Differential Single-Ended Single-Ended 2’s Complement Offset Binary 2’s Complement Offset Binary * As assembled from factory. Table 2. CLK_SEL/DF Selection Table The location and description of the components on the ADC14155 evaluation board can be found in Figure 1 as well as Section 5.0 (Schematic) and Section 7.0 (Bill of Materials) of this user’s guide. -3- www.national.com Rev 1.2 ADC14155W-MLS Evaluation Board User’s Guide 3.2 Connecting Power and Signal Sources 1. To power the ADC14155 evaluation board, connect a 5.0V power supply capable of supplying up to 500mA to the green power connector labeled “+5V” which is located along the bottom edge of the ADC14155 evaluation board. 2. Use the FutureBus connector (FB) to connect the ADC14155 evaluation board to the instrument being used to capture the data from the evaluation board. If the WaveVision Digital Interface Board is being used for data capture, please consult the WaveVision User’s Guide for details on installing and operating the WaveVision hardware and software system. broadband noise of the clock source. All results in the ADC14155QML datasheet are obtained with a tunable bandpass filter made by Trilithic, Inc. (Indianapolis, IN) in the clock signal path. The noise performance of the ADC14155 can be improved further by making the edge transitions of the clock signal entering the ADC clock input (pin 11, CLK+) very sharp. The ADC14155 evaluation board is assembled with a high speed buffer gate (NC7WV125K8X, schematic reference designator U2) in the clock input path to provide a sharp clock edge to the clock inputs and improve the noise performance of the ADC. The amplitude of the clock signal from the NC7WV125K8X high speed buffer is 3.3V. 3. Connect the clock and signal inputs to the SMA connectors labeled CLK_IN_SE (for clock) and AIN_LF (for the ADC14155LCVAL) or AIN_HF (for the ADC14155HCVAL). 4.2 Analog Input 4.0 Functional Description The clock used to sample the analog input should be applied to the CLK_IN_SE SMA connector (if using the single-ended clock mode as provided from the factory). For analog input frequencies up to 150 MHz, the circuit in Figure 2 is recommended. This is the configuration of the assembled ADC14155LCVAL as it is delivered from the factory. For input frequencies above 150 MHz, the circuit in Figure 3 is recommended. This is the configuration of the assembled ADC14155HCVAL as it is delivered from the factory. To achieve the best noise performance (best SNR), a low jitter clock source with total additive jitter less than 150 fs should be used. A low jitter crystal oscillator is recommended, but a sinusoidal signal generator with low phase noise, such as the SMA100A from Rohde & Schwarz or the HP8644B (discontinued) from Agilent / HP, can also be used with a slight degradation in the noise performance. The SNR is primarily degraded by the broadband noise of the signal generator. The clock signal generator amplitude is typically set to +19.9 dBm to produce the highest possible slew rate, but the SNR performance will be impacted minimally by slightly lowering the signal generator amplitude. Placing a bandpass filter between the clock source and the CLK_IN_SE SMA connector will further improve the noise performance of the ADC by filtering out the A low noise signal generator such as the SMA100A from Rohde & Schwarz or the HP8644B (discontinued) from Agilent / HP is recommended to drive the signal input of the ADC14155 evaluation board. The output of the signal generator must be filtered to suppress the harmonic distortion produced by the signal generator and to allow accurate measurement of the ADC14155 distortion performance. A low pass or a bandpass filter is recommended to filter the analog input signal. In some cases, a second low pass filter may be necessary. The bandpass filter on the analog input will further improve the noise performance of the ADC by filtering the broadband noise of the signal generator. Data shown in the ADC14155QML datasheet was taken with a tunable bandpass filter made by Trilithic (Indianapolis, IN) in the analog signal path. 4.1 Clock Input To obtain the best distortion results (best SFDR), the analog input network on the evaluation board must be optimized for the signal frequency being applied. -4- www.national.com Rev 1.2 ADC14155W-MLS Evaluation Board User’s Guide VCM 10 uF + 0.1 uF 49.9  AIN_LF SMA Connector 1:1 Flux Transformer ADT1-1WT 33.2  24.9  0.1 uF VRM Vin - 0.1 uF 15pF 24.9  33.2  0.1 uF ADC14155 Vin + 15pF 15pF Figure 2. Analog Input Network of ADC14155LCVAL: FIN < 150 MHz VCM 10 uF + 0.1 uF 49.9  Two 1:1 Balun Transformers AIN_HF SMA Connector 33.2  VRM Vin - 49.9  0.1 uF 0.1 uF 2pF 49.9  0.1 uF MA/COM ETC1-1-13 33.2  ADC14155 Vin + MA/COM ETC1-1-13 Figure 3. Analog Input Network of ADC14155HCVAL: FIN > 150 MHz 4.3 ADC Reference and Input Common Mode 4.4 Board Outputs The internal 1.0V reference on the ADC14155 is used to acquire all of the results in the ADC14155 datasheet. It is recommended to use the internal reference on the ADC14155. However, if an external reference is required, the ADC14155 is capable of accepting an external reference voltage between 0.9V and 1.1V (1.0V recommended). The input impedance of the ADC14155 VREF pin (pin 46) is 9 kΩ. Therefore, to overdrive this pin, the output impedance of the exernal reference source should be 150 MHz) www.national.com Rev 1.2 ADC14155W-MLS Evaluation Board User’s Guide 6.2 ADC14155LFEB (For Fin < 150 MHz) - 10 - www.national.com Rev 1.2 ADC14155W-MLS Evaluation Board User’s Guide The ADC14155 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. WaveVision is a trademark of National Semiconductor Corporation. National does not assume any responsibility for use of any circuitry or software supplied or described. No circuit patent licenses are implied. LIFE SUPPORT POLICY NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. 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Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 National does not assume any responsibility for any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. - 11 - www.national.com Rev 1.2 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. 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