GE VMIVME-3123 16-bit High Throughput Analog Input Board 16 Channels

GE VMIVME-3123 16-bit High Throughput Analog  Input Board 16 Channels

Introduction:

The VMIVME-3123 analog input board provides 16  high accuracy differential analog input channels with high  throughput 16-bit analog-to-digital (A/D) conversion rates to 1.6  million samples per second. Each input is equipped with a  dedicated sample-and-hold amplifier, a fourth-order  antialiasing filter, and a precision 16-bit A/D converter.

Digitized samples are accumulated in a data buffer until  retrieved by the system. Buffer size is software controlled from  one sample to 4 million samples.

Features:

• 16 differential analog input channels  

• Software-selectable as 1, 2, 4, 8, or 16 active channels  

• 16-bit A/D converters; one per channel  

• Simultaneous sampl 

•  e-and-hold inputs  High throughput  

— 1,600 kHz aggregate sample rate  

— 100 kHz per channel; 200 kHz with channel pairing  

• Digital calibration; no channel trimmers  

• Built-in-Test; internal references applied to channel inputs; all active devices tested  

• Large data buffer; up to 4 million data samples

• Transient capture mode triggering on input signal

• Continuous sampling mode  

• Triggering capabilities  — Internal, external, VME host triggering, or multiboard   synchronous  

• ±10V, ±5V input ranges with bipolar option and +10V, +5V  input ranges with true unipolar option  

• Selectable delay  

• Low pass filters for antialiasing

Applications:

• Precision voltage monitori 

• Data acquisition sys 

• Control systems  

• Automatic test equipment (ATE)

Functional Characteristics

Board Address: 

The physical base address for the board’s data  buffer is software selected by onboard registers in short I/O  space. The standard and extended windows into the data buffer  can be enabled/disabled through registers in short I/O space.  

VME Access: 

Address modifier bits are enabled in short I/O  registers and decoded to support both nonprivileged,  supervisory, or both access modes.

Data Transfers: 

Conversion data is retrieved from the data  buffer through the memory-mapped data space, commencing  with the first conversion sample and proceeding in sequence  through the last sample in the buffer.

System Reset: 

After a system reset occurs, the board enters an  IDLE operating mode in which the board sample clock is chosen  as the sampling source, and the buffer sizes are maximized with  all channels enabled. The board does not acquire data in IDLE  mode. The front panel LED indicator is turned ON at reset.

Calibration: 

This board calibrates itself under host control and  then uses the gain and offset coefficients during signal  acquisition. This eliminates the need for gain and offset trim  potentiometers, and provides a software solution to calibrating  the board. Calibration is performed when the host changes the  operating mode to CAL and consists of routing precision  reference voltages to the channel inputs, reading the associated  16-bit analog-to-digital converter (ADC), determining the gain  and offset coefficients, and storing them in onboard volatile  memory. During data acquisition, the A/D data in a particular  channel is multiplied by the gain coefficient and added to the  offset coefficient. This corrected data is then written to the data  buffer

Electrical Characteristics

Analog Inputs:

Input Configuration: Sixteen differential input channels, with  dedicated sample-and-hold per channel. Optional 8-channel  configuration available; see the Ordering Options.

A/D Converters: 16-bit A/D converter per channel

Voltage Ranges: ±5 and ±10V full scale, software-selectable

Offset Voltage and Drift: ±2.7µV, ±5µV/°C RTI1

Bias Current and Drift: ±55 ±1 nA/°C