Digital Channels Card Specifications

Overview

The DCC is a general purpose symmetrical digital I/O card useful for generation, verification and capturing of many types of digital and mixed signal patterns. Pattern generation is achieved by use of the built in data memory, which is 1 M vectors deep.
This card allows each of its 16 channels to generate, verify and capture patterns simultaneously with individual settable output and threshold levels. The slew rate control of the pin driver’s output is software programmable.
Each of the 16 channels on a DCC card has its own window comparator. The channels can be physically disconnected from its driver/comparator pair by means of a real relay.
Each channel can individually be switched to the analog busses, and these analog busses are routed to the central (force/sense) PMUs. The vector frequency can be freely programmed between 305 Hz and 40 MHz.

General Specifications

Digital channels per card

16

Vector depth per channel

1M

Separate memories for acquisition, patterns and vectors

full length

Output vector modulations supported

NRZ, DNRZ, RZ, R1, Custom

Timing Specifications

Master clock

20 to 40 MHz

Master clock divider (16 bit)

305 Hz to 40 MHz

Vector period (T)

3.3 ms to 25 ns

Edge placement resolution (frames)

T/8

Edge placement accuracy

<1 ns

MUX Specifications

Each pin connectable to 2 analog buses

Each pin connectable to digital channel

Relays switching time

< 0.5 ms

Switching current

0.5 A max

Driver Specifications

Voltage Output High

-10 V to +12 V

Voltage Output Low

-12 V to +10 V

Resolution (14 bit DAC)

< 2 mV

Levels per pin programmable

Output resistance (symmetrical)

50 Ω

Minimum high / low voltage difference

200 mV

Output Current (continuous)

50 mA max

Peak output current

> 120 mA (t < 1 µs)

Slew rate control (12 bit DAC)

0.2 to 1 V/ns

Comparator Specifications

Voltage Input High

-12 V to +12 V

Voltage Input Low

-12 V to +12 V

Resolution (14 bit DAC)

< 2 mV

Levels per pin programmable

Protection Specifications

Over voltage protection (OVP)

> 13 V applied on channel

Circuit break current

> 100 mA