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Part: DBS8750
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Description:
Company: Analogic Corporation
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DBS 8750
High Precision Arbitrary Waveform Synthesizer
in a "C" Size VXI Module
Introduction
The DBS 8750 is a high speed (400 kHz), 16-bit, precision, dual channel Arbitrary Waveform Synthesizer. Fully compatible with VXI specification Rev. 1.3, the DBS 8750 occupies a single "C" size slot in a VXI chassis. Highly accurate standard and arbitrary waveforms are generated for use in a variety of demanding applications such as acoustical signatures, vibration analysis, complex signal generation, automatic test equipment, linear device testing, digital communications, and biomedical signal simulation. Combining the superior performance of a dual digital-to-analog converter (DAC), with a 100 dB dynamic range, and the speed and processing capability of the TMS320C30 digital signal processor (DSP), the DBS 8750 provides precise, direct digital synthesis (DDS) of analog signals at an economically attractive price. For maximum flexibility, three sources of digital data are supported for arbitrary waveform generation and signal processing: downloaded data from VXI-resident memories, calculated data from the resident DSP, and local bus transferred data via connector P2 from other adjacent cards such as the Analogic DBS 87xx family of VXI digitizer modules. This multiple sourcing of waveform data, complemented by versatile triggering and cross-synchronization capabilities, allows easy integration of precision analog signal synthesis within sophisticated VXI instrumentation applications. Software integration effort is reduced to an absolute minimum with the DBS 8750. Message-based device architecture allows serial word communication protocols with any Slot 0 Controller using Standard Commands for Programmable Instruments (SCPI). A selection of available software drivers is offered for use with the unit.
TTL Trigger Lines Internal Data Bus
Features
u 16-Bit Precision u 400 kHz Update Rate u Two Independent Outputs u 500V Block Isolated Outputs u 0.003% Differential Nonlinearity u High Performance DSP u Library of Standard Functions u SCPI Command Compatibility u Fully Compatible with the Analogic DBS Series Modules u Software Drivers Available
Clock
Trig
Digital Timing & Control Analog Controls
Mux DAC 1 Waveform Memory 32K Words
Mux DAC 2 Waveform Memory 32K Words Program Memory PROM
V X I I N T E R F A C E
Applications
u Acoustic Signature u Automatic Test Equipment u Vibration Stimulus u Digital Communication u Biomedical Signal Stimulus u Linear Device Testing u Precision Audio Component Testing
Gate
Out 1
Output Stage 1: Filter Attenuator Output Drive Output Stage 2: Filter Attenuator Output Drive
DAC 1
DSP (TMS320C30)
Out 2
DSP/User Shared Memory 32K SRAM 17K User Accessible +5V
DAC 2 ±15V; +5V Isolated
DC-to-DC Converter
b
us
Figure 1. The DBS 8750 Block Diagram.
DBS 8750
Specifications1
ANALOG OUTPUTS
Number of Channels 2 Output Drive (programmable) Single-ended or Differential Output Voltage ±10V Single-ended or Differential (@ no load) Maximum Load Current 40 mA Crosstalk Ch. to Ch. 96 dB Resolution 16 bit Offset (programmable) +10V to 10V in 1 LSB Steps Attenuation (programmable): 0 dB to 30 dB in 0.01 dB steps. Gain (filter bypass) 1 ±0.5% Differential Non-Linearity ±0.003% of FSR Max. Output Impedance (switch selectable) 50 or 600 Output Coupling (switch selectable) DC or AC Isolation 300 VDC Total Harmonic Distortion3 94 dB @ 1.0 kHz 90 dB @ 20 kHz Square Wave, Triangle Wave Frequency 12.5 Hz to 30 kHz Settling Time to 1 LSB after 10V Step 16 µs (output filter off) Offset Voltage Typ. ±20 mV
MEMORY
Waveform memory (each channel) 32K words @ 16 bits Shared DSP/User Memory 17K words for data transfers to/ from VXI memory or P2 local bus
ENVIRONMENTAL AND MECHANICAL
Rated Performance 0°C to 50°C Storage 25°C to +75°C Relative Humidity 0 to 85% noncondensing up to +40°C Cooling 1.4 litre/sec. airflow for 10°C rise at 0.39 mm H2O back pressure Dimensions "C" size VXI Weight 3 lbs, 4 oz/1.47 kg
NOTES: 1. Unless otherwise noted, all specifications apply at 25°C. 2. Peak Distortion -- peak distortion represents the ratio between the highest spurious frequency below the Nyquist rate and the signal. 3. Total Harmonic Distortion -- total harmonic distortion represents the ratio between the RMS sum of all harmonics up to 20th harmonic and the RMS value of the signal.
TRIGGERING AND SYNCHRONIZATION
External Clock (input #1) Front Panel BNC (TTL) active low, 400 kHz Max, 120 nS Min. pulse width External Clock (input #2) TTLTRIG line P2 connector External Trigger/Start (input) Front Panel BNC (TTL) active low or TTLTRG line Gate (Delayed Gate) (output) Front Panel BNC (TTL) or TTLTRG line. Active low during waveform generation. Programmable delay 20 µs to 41.94 sec. relative to Ext. Trigger/Start Precision Clock (output) TTLTRIG line P2 connector Clock Accuracy 16 MHz ±0.005%
FILTERS
Filter Type 6 pole Butterworth Modes of Operation ON or bypass (programmable) Pass Band Frequency 25 kHz (3 dB point) Flatness in Pass Band ±0.1 dB to 10 kHz Max. ±0.25 dB to 20 kHz Max. Attenuation in Stop Band 90 dB Settling Time 250 µs to 16 bit accuracy for 20 volt step function
STABILITY (0°C TO +50°C)
Required Warm-up Time (for ultimate specifications) 15 minutes Offset Tempco ±23 µV/°C Typ. ±75 µV/°C Max. Gain Tempco ±20 ppm FSR/°C Typ. ±40 ppm FSR/°C Max. Differential Nonlinearity Tempco ±5 ppm FSR/°C Max.
DSP PROCESSOR
TMS320C30 @ 33 MHz
Specifications subject to change without notice.
STANDARD WAVEFORM OUTPUTS
Sine Wave Frequency 12.5 Hz to 20 kHz Peak Distortion2 96 dB @ 1.0 kHz 93 dB @ 20 kHz
FRONT PANEL INDICATOR
Self-Test Pass/Fail Green/Red LED
Ordering Guide
DBS 8750 Waveform Synthesizer
POWER REQUIRED
+5V Supply +4.75V Min., +5.25V Max. Power Consumption 20W maximum
SCPI Programmable
Equation (A sin 1t) (B sin 2t) a b CALculate:MATH FOR T1 A+b * e^(t) * COS(t) FOR T2 A+b * e^(t) *COS(t) Waveform SCPI Expression CALculate:MATH FOR T A * SIN(1t) * B* SIN(2t)
(A+betcos t) + (A+betcos t) 0 a
A sin ( (t x)) / ( (t x))
CALculate:MATH FOR T1 A * SIN( * (tx))/( * (tx))
Analogic Corporation Measurement and Control Division 8 Centennial Drive Peabody, MA 01960-7987, USA Tel: (508) 977-3000 Fax: (508) 977-6814
Printed in U.S.A. © 1997 ANALOGIC Corporation Bulletin No. 16-100546 REV 1 3/97 2.5M
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