Quick Start Procedure - Linear Technology DC547A Demo Manual

DEMO MANUAL DC547A

quick start proceDure

NOTE: The A inputs do not have 50Ω termination. Most
IN
generators will produce the correct signal level only if the
cable is terminated at 50Ω. If you are driving this from
a generator, you should use 50Ω through terminators.
Take care not to overdrive the inputs if you do not use
terminators.
3. Connect an 8MHz digital clock to CLKIN. With default
jumpers in place, this will result in a 125ksps conver-
sion rate.
4. Collect data via PScope for a Fourier Transform into
the frequency domain, or to allow data to be collected
and saved to a file for subsequent import and analysis
in Excel, Matlab or other analysis packages.
SIGNAL
SOURCE
IF DIFFERENTIAL
SIGNAL SOURCE
CLOCK
SOURCE
2
IF U2 POPULATED WITH BIPOLAR AMPLIFIER
+
–
+
–
Figure 1. Proper Measurement Equipment Setup
Duplication of the FFT results shown in the data sheet
requires the use of a low jitter clock and waveform gen-
erators synchronized such that the input waveform must
be within a few ppm of an exact multiple of the conver-
sion clock divided by the FFT size (termed coherent). For
125kHz sample rate and a 4096 point FFT, input frequen-
cies should be an exact multiple of 30.51757813Hz, and
preferably a prime number multiple or at least an odd
number multiple. The use of an even number multiple
will exercise a minimal number of codes, producing
poor results.
SERIAL DATA
COLLECTION SYSTEM
PARALLEL
DATA
COLLECTION
SYSTEM
USE EITHER
PARALLEL OR SERIAL
DATA COLLECTION SYSTEM
DC547 F01
dc547af