GE VME-3122A High Performance 16 Bit Analog to Digital Converter (ADC)

Panel indicator: The front panel LED controlled by the program is powered on during the reset period and turned off through CSR

Board Identification: The Board Identification Register (BIR) contains the VME-3122A identification code

Input characteristics

Number of input channels: 64, 32, or 16 differential or single ended channels

Full range A/D range: ± 2.5V, ± 5V, ± 10V, 0 to+5V, 0 to+10V, jumper optional

Channel gain: Software configuration is x1 or x10

Full range input range

Gain=1: ± 2.5V to ± 10V (bipolar); 0 to+5V, 0 to+10V (unipolar)

Gain=10: ± 250mV to ± 1V (bipolar); 0 to+0.5V, 0 to 1V (unipolar)

Accuracy (% of FSR): There are different values for different ranges and gains, based on the average of 1000 samples

Stability: Temperature drift, per degree Celsius=± 25PPM (ADC reading) plus ± 5PPM (ADC range) plus ± 2.5 µ V

Input noise: (0.4+0.3/G) mV, where G=PGA gain (noise is independent of filter options)

Input bias current (typical/maximum): 50/120nA

Input impedance (minimum): Different DC differential, DC common mode, AC differential, and AC common mode impedances when the power is turned on and off

Channel crosstalk (DC to 1kHz): 80dB between adjacent channels within ± 10V range; 70dB between adjacent channels within ± 2.5V range

Common mode voltage range: (IVCM |+| VIN |. G) ≤ 10V, where VCM=common mode voltage, VIN=input voltage, G=gain

Common mode rejection: From DC to 60Hz, when the 350 Ω source is unbalanced, the minimum common mode rejection for gain 1 is 68dB, typical 80dB; the minimum common mode rejection for gain 10 is 76dB, typical 89dB; the minimum common mode rejection for+5V and ± 2.5V ranges is 66dB, which can be adjusted on-site to achieve the same common mode rejection as gain 1

Overvoltage protection: ± 35V (continuous) power on/off; ± 80V (transient, maximum 1s)

Input filter: Optional low-pass single pole filter with different -3dB values at different frequencies, frequency doubling in single ended (pseudo differential) applications, cut-off frequency tolerance of ± 25%, unfiltered input bandwidth (20Vp-p) typically 40kHz

Common mode/floating input protection: Both sides of each input are grounded through a 22M Ω resistor

Transmission characteristics

Resolution: 16 bits

Input sampling: order, starting from channel 00

Input transfer function:

E IN=E LO+E FSR × 65536N ADC, where E IN=input voltage, E LO=lower end of input range, E FSR=full-scale input range, N ADC=A/D converter reading

A/D conversion rate: 381 to 100kSPS

Channel sampling rate (maximum): 100kSPS (100kSPS ÷ number of channels in the scan block, minimum 1 channel)

Time interval: 305 µ s to 687s

Data encoding: programmable to choose binary complement or direct/offset binary

Data buffer storage

Buffer size: 16 to 1024 consecutive 16 bit data words, program controlled

Block size: 1, 8, 16, 32 or 64 channels, program controlled

Access time: maximum 600ns during non scanning; typical 600ns during scanning, maximum 1.2 µ s (maximum access time in scanning mode only occurs when VME access occurs within the ADC sampling window)

VME access: D8 to or D16

Availability: Can be accessed from VME at any time, buffer and block sizes are controlled through configuration control registers (CCR)

Physical/Environmental Specifications

Size: 6U (4HP) single slot Eurocard shape

Height: 9.2 inches (233.4mm)

Depth: 6.3 inches (160mm)

Thickness: 0.8 inches (20.3mm)

Power requirement: 3.0A at+5VDC (maximum)

Airflow: Forced air cooling is required

Temperature: Operating temperature 0 to+65 ° C; Storage temperature -40 to+85 ° C

Altitude: Working at 0-10000 feet (3000m); Storage 0-40000 feet (12000m)

Humidity: Working relative humidity 0% to 80%, no condensation

Input connectors (P3, P4): can be ordered as 96 pin DIN non latch or 64 pin DIN latch. The center row of the 96 pin non latch connector is grounded, while the center row of the 64 pin latch connector is not grounded. When using the 64 pin latch connector in differential mode, users can provide grounding on the front panel jumpers E1 and E2, which will result in channels 31 and 63 being configured as single ended

UIOC support

In UIOC, VME-3122A is used as a monitoring device. During initialization, UIOC programs VME-3122A to scan all 64 channels and sets the scanning mode to automatic scanning. Through UCLIO ™ Language, users can set programmable channel gains and command UIOC to retrieve data from any or all channels of VME-3122A. Through a menu driven calibration process, users can create and store channel gain and offset correction factors, which UIOC automatically uses to provide software gain and offset correction for each channel.