AD8114AST Analog Devices Inc, AD8114AST Datasheet - Page 30

• Manufacturer Part Number: AD8114AST
• Description: IC VIDEO CROSSPOINT SWIT 100LQFP
• Manufacturer: Analog Devices Inc

Specifications of AD8114AST

• Rohs Status: RoHS non-compliant
• Function: Video Crosspoint Switch
• Circuit: 1 x 16:16
• Voltage Supply Source: Dual Supply
• Voltage - Supply, Single/dual (±): ±4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 100-LQFP
• Array Configuration: 16x16
• Number Of Arrays: 1
• Screening Level: Industrial
• Pin Count: 100
• Package Type: LQFP
• Power Supply Requirement: Dual
• Lead Free Status / RoHS Status: Not Compliant

AD8114/AD8115
CONTROL THE EVALUATION BOARD FROM A PC
The evaluation board includes Windows®-based control
software and a custom cable that connects the board’s digital
interface to the printer port of the PC. The wiring of this cable
is shown in Figure 58. The software requires Windows 3.1 or
later to operate. To install the software, insert the disk labeled
Disk 1 of 2 into the PC and run the file called SETUP.EXE.
Additional installation instructions will be given on-screen.
Before beginning installation, it is important to terminate any
other Windows applications that are running.
When you launch the crosspoint control software, you will be
asked to select the printer port. Most modern PCs have only
one printer port, usually called LPT1. However some laptop
computers use the PRN port.
Figure 59 shows the main screen of the control software in its
initial reset state (all outputs off). Using the mouse, any input
can be connected with one or more outputs by simply clicking
on the appropriate radio buttons in the 16 × 16 on-screen array.
Each time a button is clicked on, the software automatically
sends and latches the required 80-bit data stream to the
evaluation board. An output can be turned off by clicking the
appropriate button in the off column. To turn off all outputs,
click on RESET .
While the computer software only supports serial programming
via a PC’s parallel port and the provided cable, the evaluation
board has a connector that can be used for parallel
programming. The SER /PAR signal should be at a logic high to
use parallel programming. There is no cable or software
provided with the evaluation board for parallel programming.
These are left to the user to provide.
The software offers volatile and nonvolatile storage of
configurations. For volatile storage, up to two configurations
can be stored and recalled using the Memory 1 and Memory 2
buffers. These function in a fashion identical to the memory on
a pocket calculator. For nonvolatile storage of a configuration,
the save setup and load setup functions can be used. This stores
the configuration as a data file on disk.
Rev. B | Page 30 of 32
OVERSHOOT OF PC PRINTER PORTS’ DATA LINES
The data lines on some printer ports have excessive overshoot.
Overshoot on the pin that is used as the serial clock (Pin 6 on
the D-Sub-25 connector) can cause communication problems.
This overshoot can be eliminated by connecting a capacitor
from the CLK line on the evaluation board to ground. A pad
has been provided on the circuit side (C33) of the evaluation
board to allow this capacitor to be soldered into place.
Depending on the overshoot from the printer port, this
capacitor may need to be as large as 0.01 µF.
UPDATE
DATA IN
Parallel Port Selection
RESET
EVALUATION BOARD
DGND
CLK
CE
D-SUB-25
2
3
4
5
6
25
CRIMP TERMINAL HOUSING
MOLEX 0.100" CENTER
Figure 58. Evaluation Board-PC Connection Cable
Figure 59. Screen Display and Control Software
TERMINAL HOUSING
1
6
MOLEX
3
1
4
5
2
6
AD8114/AD8115
DGND
SIGNAL
CE
RESET
UPDATE
DATA IN
CLK
D-SUB 25 PIN (MALE)
14 1
25
PC
13