User guide

[e-mail] Fax [phone]
42
Output
timing
The signals AD0-AD3 and CS are used to address the demultiplexor
circuits. The signals continue to operate independent of whether the
DMX512 input exists.
The cycle time will vary depending on the refresh rate of the
received DMX512.
DMX512
Input
The DMX512 input connects directly to the output of a standard
RS485 or RS422 receiver such as the 75176.
Good Data
The GOOD signal is driven low to show that valid DMX512 data is
being received. The output is suitable for direct connection (via a
current limit resistor) to the cathode of a 20mA LED.
Power
Supply
The AL4007 requires a 5V DC supply at approximately 6mA
All Ground and Vcc pins must be connected.
The device is CMOS so normal handling precautions should be
adhered to.
Good decoupling and pcb layout conventions (i.e. fill all unused pcb
areas with grounded copper planes) should be followed.
Particular attention should be paid to routing the crystal
connections.
Crystal
The AL4007 requires a 16MHz, fundamental mode crystal. A tuning
capacitance of approximately 12pF is suggested between each crystal
connection and Ground. The inherent pcb and lead capacitance must
be included in this.
CS0
AD3
AD2
AD1
AD0
Channel 3