410-244

410-244 Datasheet


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410-244 410-244 410-244 (pdf)
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Overview

The Digilent Analog Discovery , developed in conjunction with Analog Devices Inc., is a multifunction instrument that can measure, record and generate analog and digital signals. The small, portable and low-cost Analog Discovery Figure 1 was created so that engineering students could work with analog and digital circuits anytime, anywhere - right from their PC. The Analog Discovery’s analog and digital inputs and outputs connect to a circuit using simple wire probes. Inputs and outputs are controlled using the free PCbased Waveforms software that can configure the Discovery to work as any one of several traditional instruments. Instruments include:

Figure Analog Discovery used in a circuit design experiment
• Two channel oscilloscope 1MΩ, ±25V, differential, 14 bit, 100Msample/sec, 5MHz bandwidth
• Two channel arbitrary function generator 22Ω, ±5V, 14 bit, 100Msample/sec, 5MHz bandwidth
• Stereo audio amplifier to drive external headphones or speakers with replicated AWG signals
• 16-channel digital logic analyzer 3.3V CMOS, 100Msample/sec *
• 16-channel pattern generator 3.3V CMOS, 100Msample/sec *
• 16-channel virtual digital I/O including buttons, switches and LEDs for logic trainer applications*
• Two input/output digital trigger signals for linking multiple instruments 3.3V CMOS
• Two power supplies +5V at 50mA, -5V at 50mA .
• Single channel voltmeter AC, DC, ±25V
• Network analyzer Bode, Nyquist, Nichols transfer diagrams of a circuit. Range 1Hz to 10MHz
• Spectrum Analyzer - power spectrum and spectral measurements noise floor, SFDR, SNR, THD, etc.
• Digital Bus Analyzers SPI, I2C, UART, Parallel ;

The Analog Discovery was designed for students in typical university-based circuits and electronics classes. Its features and specifications, including operating from USB power, a small and portable form factor, and the ability to be used by students in a variety of environments at low cost, are based directly on inputs from many professors at many universities. Meeting all the requirements proved challenging, and resulted in some new and innovative circuits. This document is a reference for the Analog Discovery’s electrical functions and operations. This reference also provides a description of the hardware’s features and limitations. It is not intended to provide enough information to enable complete duplication of the Analog Discovery, or to allow users to design custom configurations for programmable parts in the design.

DOC#:502-244

Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.

Page 1 of 38

Analog Discovery Technical Reference Manual

Architectural Overview and Block Diagram

Analog Discovery’s high-level block diagram is presented in figure 2 below. The core of the Analog Discovery is the Xilinx Spartan 6 FPGA specifically, the XC6SLX16-1L device . The Waveforms software automatically programs Discovery’s FPGA at start-up with a configuration file designed to implement a multi-function test and measurement instrument. Once programmed, the FPGA communicates with the PC-based Waveforms software via a USB2.0 connection. The Waveforms software works with the FPGA to control all the functional blocks of the Analog Discovery, including setting parameters, acquiring data, and transferring and storing data.

Signals in the Analog Input block, also called the Scope, use “SC” indexes to indicate they are related to the scope block. Signals in the Analog Output block, also called AWG, use “AWG” indexes, and signals in the Digital block use a D index all the instruments offered by Discovery and Waveforms use the circuits in these three blocks. Signal and equations also use certain naming conventions. Analog voltages are prefixed with a “V” for Voltage , and suffixes and indexes are used in various ways to specify the location in the signal path IN, MUX, BUF, ADC, etc. to indicate the related instrument SC, AWG, etc. to indicate the channel 1 or 2 and to indicate the type of signal P, N, or diff . Referring to the block diagram below,
• The Analog Inputs/Scope instrument block includes:
- Input Divider and Gain Control high bandwidth input adapter/divider. High or Low Gain can be selected by the FPGA;
- Buffer high impedance buffer - Driver provides appropriate signal levels and protection to the ADC. Offset voltage is added for vertical
position setting - Scope Reference and Offset generates and buffers reference and offset voltages for the scope stages - ADC the Analog to Digital Converter for both scope channels.
• The Arbitrary Outputs/AWG instrument block includes:
- DAC the Digital to Analog Converter for both AWG channels - I/V current to bipolar voltage converters - Out output stages - Audio amplifiers for headphone.
• A precision Oscillator and a Clock Generator provide a high quality clock signal for the AD and DA converters.
• The Digital I/O block exposes protected access to the FPGA pins assigned for the Digital Pattern Generator and Logic Analyzer.
• The Power Supplies and Control block generates all internal supply voltages and user supply voltages. The control block also monitors the device power consumption for USB compliance all power for the Analog Discovery is supplied via the USB connection . Under the FPGA control, power for unused functional blocks can be turned off.
• The USB controller interfaces with the PC for programming the volatile FPGA memory after power on or when a new configuration is requested. After that, it performs the data transfer between the PC and FPGA.
• The Calibration Memory stores all calibration parameters. Except for the “Probe Calibration” trimmers in the scope Input divider, the Analog Discovery includes no analog calibration circuitry. Instead, a calibration operation is performed at manufacturing or by the user , and parameters are stored in memory. The WaveForms software uses these parameters to correct the acquired data and the generated signals.

Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.

Page 2 of 38

Analog Discovery Technical Reference Manual

In the sections that follow, schematics are not shown separately for identical blocks. For example, the Scope

Input Divider and Gain Selection schematic is only shown for channel 1 since the schematic for channel 2 is
identical. Indexes are omitted where not relevant. As examples, in equation 4 below,
does not
contain the instrument index which by context is understood to be the Scope , nor the channel index because
the equation applies to both channels 1 and In equation 3 , the type index is also missing, because
and refer to any of P positive , N negative or diff differential values.

Analog Inputs Scope

SC1 Input divider and gain selection

Input divider
and gain
selection

Buffer

Osc Driver
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Datasheet ID: 410-244 509763