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Part: DBS8701
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Company: Analogic Corporation
Datasheet: Download DBS8701 datasheet File size : 1040 kB
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DBS 8700/8701
High Precision Digitizers 16-Bit at 200 kHz or 400 kHz
in a "C" Size VXI Module
Introduction
The DBS 8700/8701 features the first 200 kHz/400 kHz, high resolution, multichannel Digitizing Systems that combine the superior precision of 16-bit measurement with high throughput in a "C" size VXI module. Fully compatible with VXI specification Rev. 1.3, a DBS 8700/8701 occupies a single slot in a "C" size VXI chassis and provides an unparalleled price/performance ratio when used alone or in combination with other VXI modules (multiplexers, or digital-toanalog converters) within the Analogic DBS 8700/8701 series. Reflecting the many years of Analogic experience in precision instrumentation, a DBS 8700/8701 is designed to meet the stringent demands of fast and accurate measurements associated with multichannel applications such as vibration analysis, the testing of rotating machinery, and automotive and jet engine testing, as well as the analysis of large mechanical structures and other complex mechanisms. Eight shielded, differential inputs are provided with both voltage and current protection. The unit is directly expandable to 256 channels with the Analogic family of DBS multiplexer modules. Input signals are multiplexed via an instrumentation amplifier and a programmable gain amplifier, with four software selectable gains, into an ultrafast, high resolution, sampling analog-to-digital converter. The acquisition time, hold-mode settling time and droop rate ensure 16bit system performance up to the maximum sampling rate. The DBS 8700/8701 provides a powerful 2-channel, on-board DMA controller as a standard feature. The DMA controller executes fast transfers over the VMEbus (P1) sending data directly into the system's memory, significantly enhancing total system performance by dramatically reducing the I/O overhead of the bus. Three flexible trigger sources are available: a user-supplied outside trigger, an internal trigger derived from a precision clock residing on the module, and a data dependent trigger produced by the occurrence of a specified event on a selected channel. Before beginning the data acquisition, trigger information, as well as channel selection inside a scan, and gain setting are downloaded into the timing and control unit resident on the DBS 8700/8701 module. For ease of integration, a selection of available software drivers is offered for use with the card. No coding is required by the user; all necessary commands are included in the driver.
Precision Clock Ext. Trig Ext. Start Pass/Fail LED Busy LED LED 0 Ch. Sel. LED 7 + Input 0 + Input 1 Protection Protection Protection Protection Differential Multiplexer 8:1 Sampling A/D Converter 16 Bit 1 kW FIFO Timing & Control V X I DMA Controller I N T E R F A C E Buffer Trigger Unit Buffer P2 Sync In P2 Ctrl. Out Ctrl. P1 Intrpt.. P1 Address P1
Features
u 16-Bit Resolution & Accuracy u 200 kHz or 400 kHz Throughput Rate u On-Board Sequencer u 8 Differential Inputs u Expandability up to 256 Channels u Simultaneous Sampling via Companion Multiplexer Module DBS 8710 u Dynamically Set Gain per Channel u Peak Distortion 96 dB (DBS 8700) 91 dB (DBS 8701) u Variable Sampling Rate u Multiple Sample Clock Sources u Versatile Trigger Unit u Software Drivers Available
Applications
u Real Time Data Acquisition u Precision Instrumentation u Automatic Test Equipment u Monitoring and Control
2K Sequence Control
Data P1
b
us
IA P1 +5V Dig. Rtn. (VXI)
PGA
16 Data P2
+ Input 7 -
Protection Protection
DC/DC Converter
Buffer
Figure 1. The DBS 8700/8701 Block Diagram.
DBS 8700/8701
Specifications1
ANALOG INPUTS
Number of Channels Input Ranges Gain 1 Gain 2 Gain 4 Gain 8 Input Bias Current Input Resistance Input Capacitance Common Mode Voltage Input Overvoltage Protection Input Current Protection
DBS 8700
8 differential, expandable to 256 DBS 8700-B05 DBS 8700-B10 ±5V, ±10V, ±2.5V, ±5V, ±1.25V, ±2.5V, ±0.625V, ±1.25V, 5 nA Max. 100 M Typ. 70 pF Max. ±10V Max. ±25V Max. 50 mA Max. DBS 8700-U10 0 to +10V 0 to +5V 0 to +2.5V 0 to +1.25V
DBS 8701
8 differential, expandable to 256 DBS 8701-B05 DBS 8701-B10 ±5V, ±10V, ±2.5V, ±5V, ±1.25V, ±2.5V, ±0.625V, ±1.25V, 5 nA Max. 100 M Typ. 70 pF Max. ±10V Max. ±25V Max. 50 mA Max. DBS 8701-U10 0 to +10V 0 to +5V 0 to +2.5V 0 to +1.25V
CLOCK/TRIGGER INPUTS
Logic Levels, LSTTL/CMOS Compatible Logic "0" Logic "1" Termination 0.8V Max. 2.0V Min. 50 1, 2, 4, 8 (±0.02% Max.) ±10 mV Max. 12 V/µs Min. 100 dB @ 60 Hz Typ. 200 kHz 1.5 µs Typ. 204.8 kHz (0.5 LSB + 30 µV) RMS 96 dB (@ 1 kHz) Typ. 25 ns Typ. ±400 ps RMS Max. 90 dB (@ 1 kHz) Typ. 96 dB Typ. (@ 10 kHz) 91 dB Typ. (@ 10 kHz) 16 Bits ±0.5 LSB Max. ±0.003% FSR Max. Guaranteed from 0°C to +50°C ±0.01% Guaranteed 0.8V Max. 2.0V Min. 50 1, 2, 4, 8 (±0.02% Max.) ±10 mV Max. 80 V/µs Min. 100 dB @ 60 Hz Typ. 400 kHz 1.5 µs Typ. 409.6 kHz (0.5 LSB + 50 µV) RMS 90 dB (@ 1 kHz) Typ. 25 ns Typ. ±100 ps RMS Max. 90 dB (@ 1 kHz) Typ. 91 dB Typ. (@ 10 kHz) 90 dB Typ. (@ 10 kHz) 16 Bits ±0.5 LSB Max. ±0.003% FSR Max. Guaranteed from 0°C to +50°C ±0.01% Guaranteed
AMPLIFIER CHARACTERISTICS
Gain Offset Voltage Slew Rate CMRR Full Power Bandwidth Settling Time To ±0.001% (10V Step, Gain = 1)
DYNAMIC CHARACTERISTICS
Maximum Sampling Rate Noise (Referred to input and measured over 700 kHz equivalent noise bandwidth) Differential Crosstalk S/H Aperture Delay S/H Aperture Jitter S/H Feedthrough Peak Distortion(2,4) Total Harmonic Distortion(3,4) Resolution Quantization Error Integral Non-Linearity No Missing Codes Full Scale Range (Gain Accuracy) Monotonicity
TRANSFER CHARACTERISTICS (A/D CONVERTER)
STABILITY (0°C TO +50°C)
Required Warm-up Time (for ultimate specifications) Offset Tempco Gain Tempco Differential Non-Linearity Tempco Precision Clock Recommended Recalibration Interval 15 minutes 50 µV/°C Max. 20 ppm FSR/°C Max. ±1 ppm FSR/°C Max. ±10 ppm, 0-50°C 6 months Software write to register. Automatically synchronized with on-board precision clock. Via front panel BNC or TTLTRG Line Generated at the occurrence of a predefined value and slope, at a specified channel 15 minutes 50 µV/°C Max. 20 ppm FSR/°C Max. ±1 ppm FSR/°C Max. ±10 ppm, 0-50°C 6 months Software write to register Automatically synchronized with on-board precision clock. Via front panel BNC or TTLTRG Line Generated at the occurrence of a predefined value and slope, at a specified channel
TRIGGER (START/STOP) MODES
Internal
External (TTL Active Low) Data Dependent
SAMPLE CLOCK
DBS 8700
Internal via programmable, 10 bit divider and 3.6864 MHz ±0.001% Clock. Produces 3.6k samples/sec to 204.8k samples/sec in 1006 steps. External, 2.5 MHz to 4.0 MHz, TTL, 50% duty cycle clock via front panel BNC connector & Internal, programmable 10-bit divider. Min. sample rate = 2.5 MHz ÷ 1023 = 2.4k samples/sec. External, 0 to 204.8 kHz sample clock via front panel BNC connector or P2 TTLTRG line per VXI spec. Clock signal is TTL active low, edge triggered with low period = 150-200 ns. Master/slave(s) for sychronizing multiple modules via P2 TTLTRG line per VXI spec.
DBS 8701
Internal via programmable, 10 bit divider and 3.6864 MHz ±0.001% Clock. Produces 3.6k samples/sec to 409.6k samples/sec in 1015 steps. . External, 2.5 MHz to 4.0 MHz, TTL, 50% duty cycle clock via front panel BNC connector & Internal, programmable 10-bit divider. Min. sample rate = 2.5 MHz ÷ 1023 = 2.4k samples/sec. External, 0 to 409.6 kHz sample clock via front panel BNC connector or P2 TTLTRG line per VXI spec Clock signal is TTL active low, edge triggered with low period = 150-200 ns. Master/slave(s) for sychronizing multiple modules via P2 TTLTRG line per VXI spec.
NOTES: 1. Unless otherwise noted all specifications apply at +25°C. 2. Peak Distortion represents the ratio between the highest spurious frequency component below the Nyquist rate and the signal. 3. Total Harmonic Distortion represents the ratio between the RMS sum of all harmonics up to the 20th harmonic and the RMS value of the signal. 4. ±10V input signal. 5. Single gain setting per scan.
.
DATA TRANSFER
Output Coding Via VMEbus Binary, Offset Binary, Two's Complement 16-bit word transfer via on-card DMA into VXI A24 Memory using a 1k word FIFO buffer Single buffer = 65K words Max. Multiple buffers limited only by available system A24 memory. Continuous Acquisition via multiple swinging buffers. FIFO status or DMA memory buffer filled 2 successive bytes transfer to adjacent slot Register Based, Local Bus User A24/16, D16, I1, Slave A24, D16 Master (DMA) 1024 Every scan list entry. Rated performance maintained. 256 when using companion multiplexer modules. Green/Red Red Green +4.75V Min., +5.25V Max. 20W Max. Binary, Offset Binary, Two's Complement 16-bit word transfer via on-card DMA into VXI A24 Memory using a 1k word FIFO buffer Single buffer = 65K words Max. Multiple buffers limited only by available system A24 memory Continuous Acquisition via multiple swinging buffers. FIFO status or DMA memory buffer filled 2 successive bytes transfer to adjacent slot Register Based, Local Bus User A24/16, D16, I1, Slave A24, D16 Master (DMA) 1024 Every scan list entry. Rated performance maintained. 256 256 when using companion multiplexer modules. Green/Red Red Green +4.75V Min., +5.25V Max. 20W Max.
Data Buffers
Interrupts Via VXI Local Bus
VXI/VME COMPLIANCE
VXI VME
SCAN SEQUENCE CONTROLLER
Number of Steps Gain Change Capability Maximum Number of Multiplexed Channels
FRONT PANEL INDICATORS
Pass/Fail LED Busy LED Channel Selection
POWER REQUIRED
+5V Supply Power Consumption
ENVIRONMENTAL AND MECHANICAL
Temperature Range Rated Performance Storage Relative Humidity Cooling Dimensions Front Panel Potential Weight
Specifications subject to change without notice.
0°C to +50°C 25°C to +75°C 0 to 85% non-condensing up to +40°C 1.2 litre/sec. airflow for 10°C rise at 0.29 mm H2O back pressure VXI "C" Size Chassis Ground 3 Lb, 6oz/1.53 Kg
0°C to +50°C 25°C to +75°C 0 to 85% non-condensing up to +40°C 1.2 litre/sec. airflow for 10°C rise at 0.29 mm H2O back pressure VXI "C" Size Chassis Ground 3 Lb, 6oz/1.53 Kg
Ordering Guide
DBS 8700
16-Bit, 200 kHz DAS/Digitizer DBS 8700 B05 Bipolar, ±5V DBS 8700 B10 Bipolar, ±10V DBS 8700 U10 Unipolar, 0 to ±10V
DBS 8701
16-Bit, 400 kHz DAS/Digitizer DBS 8701 B05 Bipolar, ±5V DBS 8701 B10 Bipolar, ±10V DBS 8701 U10 Unipolar, 0 to ±10V
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. 16-100608 Rev 0 3/97 2.5M
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