NOVATECH INSTRUMENTS
12MHz Direct Digital Synthesizer Module
Model DDS3m
Photo
Last Modified January 10, 2001
The DDS3 Direct Digital Synthesizer is a low distortion Signal
Source that can be set from 2 Hz to 12 MHz with both Sine and TTL
outputs. The Sine output amplitude is 1.4 Vpp into an open circuit.
The frequency can be set in 2 Hz steps using DIP switches or the
binary output from a computer. The DDS3m is available fully assembled
or as a kit of parts for user assembly.
Specifications
OUTPUT
TYPES: Sine and TTL (Simultaneously)
RANGE: 2 Hz to 12 MHz
RESOLUTION: 2 Hz
AMPLITUDE: Approximately 1.4 Vpp open circuit, 0.7 Vpp into 50 ohms (Sine)
FREQUENCY CONTROL
Frequency is set by programming a 23 bit binary word using DIP
switch or parallel input. TTL/CMOS compatible. DIP switch and connector
for ribbon cable included. Inputs ESD protected.
SPECTRAL PURITY
PHASE NOISE: < -90 dBc at 1 KHz offset
SPURIOUS: Typically <-55dBc below 5 MHz, <-45dBc from 5 to 12MHz
HARMONIC: < -50 dBc below 5 MHz, <-40dBc below 12 MHz
ACCURACY AND STABILITY
Adjustable to ±10ppm, 0 to 50C
Stable to ±10 ppm/year, 20 to 30C
OUTPUT IMPEDANCE
50 or 75 ohms Sine and TTL
CONTROL SIGNALS
RESET: Resets frequency input to zero
FCSELECT: Low sets frequency updates with each clock cycle, high sets
frequency updates asyncronously when clocked in by HOPCLK control
input.
HOPCLK: Low to high transition clocks in new frequency setting whenever
FCSELECT is high. Transition time is less than 250 nanoseconds.
POWER
+5VDC ± 5% @ 125mA and -5VDC ± 5% @ 100mA.
SIZE
3.5" X 4.5" PWB with provisions for mounting and shield.
CONNECTORS
0.025 Square posts for power and signal. 2 row by 25 pin header for
frequency control.
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Novatech Instruments , Inc.
P.O. Box 55997
Seattle, WA 98155 USA
Return to Homepage: http://www.eskimo.com/~ntsales.html
Technical Questions: novatech@eskimo.com