EVAL-AD1555 AD | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 9

Technical content

Tel: 617/329-4700 Fax: 617/326-8703 REV. PrD Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. /G61 FEATURES : On-Board Reference, Oscillator, Control Logic and Buffers Easy interface to printer port of PC PC Software for Control and Data Analysis Stand Alone Capability to ease design Analog and Digital Prototype Area Preliminary Technical Data Evaluation Board AD1555/AD1556 24-Bit /H9018-/H9004 ADC EVAL-AD1555/56EB GENERAL DESCRIPTION The EVAL-AD1555/56EB is an evaluation board for the AD1555 and AD1556 24-bit /H9018-/H9004 ADC chip-set. The AD1555/AD1556 chip-set can convert a high dynamic range input signal, operates from +5V and -5V supplies and uses a serial interface. The AD1555/AD1556 evaluation board is designed to demonstrate the ADC's performance and operation. A full description of the AD1555/AD1556 is available in the AD1555/AD1556 data sheet and should be consulted when utilizing this evaluation board. FUNCTIONAL BLOCK DIAGRAM The EVAL-AD1555/56EB is ideal for use either as a stand- alone evaluation board to interface with a customer applica- tion or with any compatible PC using the parallel printer port. On-board components include an AD780 3V ultra low noise bandgap reference, a crystal oscillator, and digital control logic. The board has both a Centronics male connector to interface with PC printer port and a 50-pin connector for stand-alone operation. Software is provided to allow simple demonstration and evaluation of the AD1555/AD1556 chip-set. +5V - 5V SJ3 oscillator AD1555 AD1556 Ref FPGA 50-Way connector 25-WAY D-Type connector Ain Tin +5V SJ2 +5V SJ1 Σ∆ modPGA PGA_MOD

REV. PrD –3– EVAL-AD1555/AD1556 - The software uses a special font which can be installed using Start>Settings>Control Panel>Fonts>File>install new fonts> then select ADILogo Regular in the working directory then OK. - To operate the software, follow the 5 steps described in figure 1. Using the EVAL-AD1555/56B in the customized system : The EVAL-AD1555/56EB is also designed to ease the evaluation and the design of the AD1555 and the AD1556 in the customized system. The useful interface signals can be connected to the customized system using the connector P2. The switch SW1 in the position where the identification dot of the switch is hidden changes the configuration of U1 as follows : - The AD1556 CLKIN at 1.024MHz is supplied by U1 ( exact division by 8 of U5 oscillator ). - U1 transmits the AD1556 MCLK output ( 256kHz ) to the AD1555 MCLK with the appropriate phase ( one inversion is done by U1 in order to cancel the U9 inversion). - U1 output pins PGA0-4, CS*, R/W*, DINM1, BW0-2, H/S*, RSEL, CSEL, PWRDN, RESET, SYNC, SCLKOUT, TDATA are Hi-Z . This configuration allows the control of these signals by the customized system. The AD1555 and AD1556 clock are still generated by the EVAL-AD1555/56EB. Integrated Circuits U1 FPGA EPM7128ELC84-15. U2 AD1556AS. U3 AD1555AP. U4 reference AD780AN. U5 Oscillator 8.192MHz. U6 Buffer 74HC245. U7 Invertor 74HC04. U8,U9 Opt ocoupler HCPL2630. Capacitors C1-C6,C8-C9,C11-C12, C14-C16,C22-C24,C27, C29-C31,C33,C34 100nF Ceramic Capacitors. C7,C10,C13,C17-C18, C21,C25,C26,C28 10 /H9262F Tantalum Capacitors. C20 22 /H9262F Tantalum Capacitor 6.3v. TABLE III. Component List. Resistors R6,R10-R15 47.5K/H9024 Resistor. R1-R5 13K /H9024 Resistor. R8,R9 4.7K/H9024 Resistor. R17,R21,R22 2K /H9024 Resistor. R18-R20 402 /H9024 Resistor. R16 10 /H9024 Resistor. Sockets P2 50pin Male ribbon cable connector. P1 25pin DB-25 connector. JP2 2 Position Male jumper strip. PB1 SMT push-button. SW1,JP1 Slide Switch. SMB1-SMB5 SMB Connector.

controls, interface settings. changes into computation, sampling, configuration menus. F3 is the key command for "compute". cursor...), and controls outputs ( save to file or print ). Figure 1. Software main screen.

Figure 2. Frequency domain screen with measurements. harmonics uses in the THD computation is selectable.

Figure 3. Time domain screen with AD1556 Status register content. register reading. This feature is only available in time domain. the cursor in the time domain display.

Figure 4. Schematics.