Hardware Setup; Signal Connections - Linear Technology DC1339 Quick Start Manual

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1339
DC590B QUICK START PROCEDURE
Connect DC1339A to a DC590 USB serial controller
using the supplied 14-conductor ribbon cable.
Connect DC590 to a host PC with a standard USB
A/B cable. Run the evaluation software supplied with
DC590 or download it from www.linear.com. The
correct control panel will be loaded automatically.
HARDWARE SET UP

SIGNAL CONNECTIONS

J1 SMA connector for IN+. Limit input swings to
0V-4.096V. For optimum performance, the input
should be band limited to the frequencies of interest.
See schematic for details.
J2 FastDAACS interface to DC890B. Do not use J4 at
the same time.
J3 Conversion Clock Input. This input has a 50•
termination resistor, and is intended to be driven by
a 14dBm sine or square wave. To achieve full AC
performance of this part, the clock jitter should be
kept under 20ps. This input is capacitively coupled
to a clock buffer so that level shifting is not required.
To run at maximum conversion rate, apply a 40MHz
signal to this connector. J3 is used only for DC890B.
DC590B generates its own clock signal.
J4 Quick Eval interface to DC590B. Do not use J2 at
the same time. This connector can also be used to
drive the ADC directly. See schematic for details.
LOW NOISE, 500KSPS, 12-BIT ADC
Version K73 of QuikEval or higher should be used for
this board. Click the COLLECT button to begin
reading the ADC. Change the range (unipolar or
bipolar) by right clicking over the range indicator in
the display. See Figure 5.
JUMPERS
JP1 (OVDD) connects the OVDD pin of the ADC to 5V
or to an external voltage. The SDO pin swings from
ground to OVDD.
JP2 contains CONV, SDI, SCK and a buffered SDO
signal. This connector is intended to monitor these
signals. For for those who want to drive the ADC
directly use J4.
JP3 (IN-) selects whether the IN- pin of the ADC is to
be cleanly grounded near the ADC or connected to
VREF/2.
JP4 (VREF) selects onboard or external reference for
the ADC
JP5 (DIN Word) selects the channel configuration
and unipolar/bipolar settings of the ADC. (JP5 is
used by the DC890B only. It is ignored by the
DC590B.)
GROUNDING AND POWER CONNECTION
Connect a 6V to 9V power supply to the 6-9VDC and
GND posts when using DC890B. If the DC590B is
used it will provide power to the DC1339.
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