V490 16-channel VME multi-range digitizer

Multi-Range Digitizer - V490
  • Sixteen channels of independently programmable differential analog input acquisition
  • Input ranges from ±10.24 mV to ±40.96 V with 16-bit resolution
  • Sample rate up to 500 Ks/s per channel
  • Programmable lowpass filter per channel from 1 Hz to 100 KHz
  • Simultaneous sampling, extendable across modules
  • Realtime and FIFO-buffered data simultaneously available
  • Common-mode rejection 100 dB typical, ±10 V common-mode range
  • Overload protected to ±250 volts on all ranges
  • Handshake-free dual-port memory
  • In-crate calibration check via dedicated test connector
  • Optional built-in self-test
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The V490 includes 16 independent acquisition channels, each with a programmable-gain differential amplifier, analog anti-aliasing filter, 16-bit analog-to-digital converter, and digital post-processing. With a dedicated A/D converter per channel, the V490 provides true simultaneous sampling, which can be extended across multiple V490s or triggered from an external TTL signal.

Both realtime and FIFO buffered data are simultaneously available, with each path having its own programmable digital filter. FIFO load rates are internally programmable to up to 500 Ks/s, or may be externally triggered. Digital processing allows emulation/replacement of a classic Neff type architecture, namely a preamp and analog lowpass filter feeding a low-aperture-jitter triggerable ADC per channel, while adding the ability to watch the real-time data at any time without disturbing the FIFO acquisition.

The V490 also integrates with Highland's advanced test and calibration architecture, allowing each channel to be relay switched to a dedicated calibration bus. The calibration bus allows one or many modules to be automatically connected to an external DVM, providing traceability with no need to disturb field wiring. Automatic built-in self-test is also available.

FUNCTION 16-channel differential analog-to-digital converter
DEVICE TYPE 16-bit VME register-based slave: A24:A16:D16:D32;
Implements 256 16-bit registers at switch selectable addresses in the VME 16 or 24 bit addressing spaces
RANGES Programmable per channel
± 10.24 mV ± 40.96 mV ± 160 mV ± 640 mV
± 2.56 V ± 10.24 V ± 40.96 V
RESOLUTION 16 bits, 0.313 µV on 10.24 mV range
INPUT IMPEDANCE > 500 K to ground, each differential input
ACCURACY ± 0.05% of range ± 20 µV ± 5 µV/°C
CMRR 100 dB typical on 10 mV range to 60 dB typical on 40 V range
CM range ± 10 V, ± 140 V on 10 and 40 V ranges
SAMPLE RATE 500 Ks/s
FIFO path has programmable trigger rate
BANDWIDTH -3 dB at 100 KHz typical, 50 KHz on 10 mV range
FILTERING Analog, 100 KHz 5-pole pre-ADC lowpass
Digital, 1 Hz to 50 KHz, 8-pole Bessel or Butterworth
PROTECTION ± 250 volts either input to ground
OPERATING TEMPERATURE 0 to 60°C; extended MIL/COTS ranges available
CALIBRATION INTERVAL One year
POWER Standard VME supplies:
+ 5 volts, 0.8 amp max
+12 volts, 250 mA max
-12 volts, 250 mA max
CONNECTORS Two D25 female, each 8 channels
One D9 male analog test
One SMB trigger i/o
INDICATORS LEDs indicate VME access, CPU activity, error conditions;
Additional LED is user programmable
PACKAGING 6U single-wide VME module
CONFORMANCE ANSI/VITA 1-1994 (R2002) VMEbus spec; does not support byte writes

PDF Block Diagram: V490 multi-range digitizer

PDF Datasheet: V490 multi-range digitizer

PDF Manual: V490 multi-range digitizer

V490-1: 16-channel VME multi-range digitizer

V490-2: 16-channel VME multi-range digitizer with BIST

J55: 6' shielded D25 male to D25 male cable

J56: 10' shielded D25 male to D25 male cable

J71: Dual D9 female to Agilent 34104A cable

J75-2: D9 female to dual banana plug cable

J76: D9 OpenCVA busing cable

J346-X: SMB trigger bus cable

J475-1: 8-channel D25 female Din rail termination panel