Specifications

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SPECIFICASPECIFICA

SPECIFICA

TIONS AND BUFFER OPTIONSTIONS AND BUFFER OPTIONS

TIONS AND BUFFER OPTIONS

VDX SERIES MAVDX SERIES MA

VDX SERIES MA

TRIXTRIX

TRIX

Fig. 1 VDM/32x32 Mainframe with RS232, IEEE488 and LAN Control, with BNC Signal Connections

INPUT and OUTPUT BUFFERSINPUT and OUTPUT BUFFERS

INPUT and OUTPUT BUFFERS

Optional very wideband Buffers are available for all Input and Out-

put Channels. These buffers serve up to three different purposes:

1) They transform impedances to allow the solid state switch fab-

ric to be used for signals requiring other than two wire analog, for

example 50 ohm coax.

2) Input Buffers can be used to reduce signals to levels where

they can be safely switched by the matrix.

3) Output Buffers can have preset gains to boost signals to re-

quired voltages.

A typical Output buffer is shown schematically in Fig. 2. Resistors

Rs and Ri set the input impedance and also attenuate the input

signal (if needed), while Rout determines the output impedance.

The circuit is typically built with one of several standard small

signal Op Amps, but custom amplifiers are also possible. Speci-

fications for a typical small signal amplifier are shown below.

BUFFER SPECIFICABUFFER SPECIFICA

BUFFER SPECIFICA

TIONSTIONS

TIONS

Bandpass (-3dB) Typically>500 MHz

Preset Gains (Av) 2 to 16

Output Current 80 mA typical

Rise Time 3100 V/us typical

The VDM Series is intended to switch small signal levels in a

nonblocking (any input to any output) and full fan out (any input to

any or all outputs) configuration. The heart of the system is a solid

state 32x32 switch fabric.

The basic system holds the neces-

sary control module, power supplies and the switch fabric

The system is completed by adding the required input or out-

put buffers. The buffers supply impedance matching and/or

signal level transformations. This design provides switching

for a large number of different signal types.

In 0-7 In 8-15

In 16-23 In 24-31

Out 0-7 Out 8-15

Out 16-23 Out 24-31

ACDEFGH

B ACDEFGH

ACDEFGH

A/C-In

IEEE-488

RS-232

LAN

WARRANTYWARRANTY

WARRANTY

CYTEC Corp. warrants that all products are free from defects

in material or workmanship for a period of five years.

SOFTWARESOFTWARE

SOFTWARE

Free drivers and/or sample programs are available for the most

commonly available application programming languages.

Rout

OUT

Fig. 2 Typical Output Buffer

VDM-2

ENVIRONMENTENVIRONMENT

ENVIRONMENT

ALAL

Dimensions

Weight

Operating Temperature

Storage Temperature

Altitude, Operational

Altitude, Storage

Humidity

19' rack mount x 5.25" H x 15.6" D

20 lbs. max. with buffers installed

to 65

-25

to 80

3,000 meters

15,000 meters

95% RH noncondensing to 30

POWERPOWER

POWER

90-264 Volts AC, 47-63 Hz

High Efficiency Switching

250 Watts Maximum for 32x32 Matrix

AC Input

DC Supply Type

Consumption

BANDPBANDP

BANDP

ASSASS

ASS

Approx. 500 MHz (-3dB) for 0 dBm

0.5 dB at 0 - 300 MHz

1800 V/usec

Small Signal

Flatness

Slew Rate

CROSSTCROSST

CROSST

ALK / ISOLAALK / ISOLA

ALK / ISOLA

TIONTION

TION

-50 dB at 240 MHz

-60 dB at 240 MHz Non Adjacent

-40 dB at 360 MHz

-50 dB at 360 MHz Non Adjacent

Crosstalk

Isolation

MISCELLANEOUSMISCELLANEOUS

MISCELLANEOUS

Switching Speed 100 ns plus any computer delay

Connections

VDM SPECIFICAVDM SPECIFICA

VDM SPECIFICA

TIONSTIONS

TIONS

BNC Signal Connections, AC inputand Re-

mote Control input are on rearpanel shown

in Fig.1. Optional signal connectors in-

cluding SMA, SMB, TwinBNC and Triax.