DC718C Linear Technology, DC718C Datasheet - Page 4

• Manufacturer Part Number: DC718C
• Description: USB Data Acquisition Controller, For QuikEval -II Evaluation Kits
• Manufacturer: Linear Technology
• Series: QuickEval-II™r

Specifications of DC718C

• Design Resources: DC718C Design Files DC718C Schematic
• Main Purpose: Data Conversion, ADC, DAC
• Embedded: Yes
• Utilized Ic / Part: -
• Primary Attributes: -
• Secondary Attributes: USB, I2C, SPI Interface
• Kit Application Type: Interface
• Application Sub Type: USB Interface
• Kit Contents: QuickEval-II Software
• Lead Free Status / Rohs Status: Not applicable / Not applicable

In most cases the DC718 can operate from the USB
power except were very high speed operation exceeds
the power limits of the USB port or extremely noise sen-
sitive measurements require laboratory grade power.
Adding a ferrite common mode filter to the USB Cable
may reduce noise in these cases. The DC718 provides a
connector for a 5mm power plug at 6-9V. Inserting this
connector into the 5mm power jack automatically dis-
connects USB power from the board.
LED INDICATORS
The DC718 provides system status via 8 LEDs:
LED-1.
LED-2.
LED-3.
CIRCUIT DETAILS
A schematic is attached to the end of this Quick Start
Guide for reference only.
TROUBLE SHOOTING GUIDE
Problem: DC718 is plugged in, but QuickEval-II soft-
ware still does not recognize DC718 board.
Solution: Assuming that the USB hardware in your
computer is operational (Try verifying an operational
USB port with another USB device such as a USB
Memory stick, printer or scanner if available.), the
likely cause is improper installation of the USB drivers,
which results in Windows recognizing the DC718 as
an “Unknown Device”. If this is the case, the problem
can be corrected by the following procedure:
TRANSFER – Indicates a data transfer from the
SEEP – Indicates presence/access of the optional
RST – Indicates assertion of either a hard or soft
QuickEval-II to the PC.
demonstration circuit Serial Electrically Eras-
able PROM on select demonstration boards
permitting QuickEval-II software to automati-
cally identify the device being evaluated.
reset.
The DC718 has provisions for an external trigger input,
polarity selectable by software. This permits initiating
data block capture by an external event.
Do not connect anything to J1, J2, J3 or SV1. J5 should
have a jumper from Pin 2 to Pin 3. These connectors
are used for programming and testing the DC718.
J4 is an I2C port for future expansion. J8 is a test port
for CPLD software development and is not populated.
LED-4.
LED-5.
LED-6.
LED-7.
LED-8.
1) Unplug the DC718 board from the USB port.
2) Re-install the QuickEval-II Software. CAREFULLY
3) If the problem persists, please choose “Contact
following the on-screen instructions. This MAY
require a reboot of your computer. The in-screen
instructions will inform you if that is the case.
Software Support” from the Tools Menu for assis-
tance from the LTC staff.
POWER – Power on indicator.
OVERFLOW – Indicates an overflow occurred
D_RDY – Indicates completion of data block ac-
RUN – Indicates the board is ARMED to collect a
TRIG – indicates that a trigger was received and
during the last block acquisition.
quisition.
block of data.
data collection has started.
QUICKEVAL-II
4