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- 1 µHz to 3.1 MHz frequency range
- 1 µHz frequency resolution
- Sine, square, ramp, triangle and noise
- Phase continuous frequency sweeps
- FSK modulation
- 10 Vpp into 50 Ω
- RS-232 and GPIB interfaces (opt.)
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The DS335 is a simple, low-cost, 3 MHz function generator designed
for general benchtop or ATE applications. Based on a Direct Digital
Synthesis (DDS) architecture, the DS335 includes features not normally
found in function generators in this price range.
Basic functions include sine waves and square waves up to 3.1 MHz,
and ramps and triangles up to 10 kHz. A 3.5 MHz Gaussian white-noise
generator is also provided. All functions can be swept logarithmically
or linearly in a phase-continuous fashion over the entire frequency
range. A rear-panel SWEEP output marks the beginning of a sweep
to allow synchronization of external devices. Both unidirectional
and bidirectional sweeps can be selected.
Both internal and external FSK modes allow the output frequency
to be rapidly toggled between two preset values. Toggling is done
either at a fixed, internal rate of up to 50 kHz, or externally
via a rear-panel input.
Outputs have the low phase noise inherent to DDS. Wide-band amplifiers
maintain good pulse response and provide low distortion. The result
is an output capable of driving 10 Vpp into a 50 Ω
load, or 20 Vpp into a high-impedance load.
Both GPIB and RS-232 interfaces are available to provide complete
control via an external computer. All instrument functions can be
set and read via the computer interfaces.
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| Specifications |
| Frequency Range |
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Max. Frequency |
Resolution |
| Sine |
3.1 MHz |
1 µHz |
| Square |
3.1 MHz |
1 µHz |
| Ramp |
10 kHz |
1 µHz |
| Triangle |
10 kHz |
1 µHz |
| Noise |
3.5 MHz |
(Gaussian weighting) |
| Output |
| Source impedance |
50 Ω |
| Grounding |
Output may float up to ±40 V (AC
+ DC) |
| Amplitude |
| Range |
50 mVpp to 10 Vpp (50 Ω), 100 mVpp to 20 Vpp (High-Z) |
| Resolution |
3 digits (DC offset = 0V) |
| Offset |
±5 VDC (50 Ω), ±10 VDC (High-Z) |
| Offset resolution |
3 digits |
| Accuracy |
0.1 dB (sine output) |
| Sine Wave |
| Spurious response |
<-65 dBc to 1 MHz, -55 dBc to 3.1 MHz |
| Harmonic distortion |
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| DC to 100 kHz |
<-60 dBc |
| 100 kHz to 1 MHz |
<-50 dBc |
| 1 MHz to 3 MHz |
<-40 dBc |
| Phase noise |
<-60 dBc (30 kHz band centered on carrier) |
| Square Wave |
| Rise/fall time |
<15 ns ± 5 ns (10 % to 90 %) |
| Asymmetry |
<3 ns + 1 % of period |
| Overshoot |
<5 % of amplitude (full output) |
| Ramps and
Triangles |
| Rise/fall time |
100 ns |
| Linearity |
±0.1 % of full scale |
| Settling time |
200 ns (0.5 % of final value) |
| FSK Modulation |
| Modes |
Internal, External |
| Max. rate |
50 kHz, internal |
| External FSK |
TTL input, 1 MHz (max.) |
| Sweeps |
| Type |
Linear and logarithmic (phase continuous) |
| Span |
Linear (full frequency range), log (6 decades) |
| Sweep rate |
0.01 Hz to 1 kHz |
| Timebase
Accuracy |
| Standard |
±5 ppm (20 °C to 30 °C) |
| Optional |
TCXO, 2 ppm stability, 2 ppm aging (20 °C to 50
°C) |
| General |
| Interfaces |
Optional RS-232 and GPIB. All instrument functions are
controllable over the interfaces. |
| Non-volatile memory |
Up to nine sets of instrument settings may be stored
and recalled. |
| Dimensions |
8.5" × 3.5" × 13" (WHL) |
| Weight |
8 lbs. |
| Power |
22 W, 100/120/220/240 VAC, 50/60 Hz |
| Warranty |
One year parts and labor on defects in materials and
workmanship |
Stanford Research Systems, Inc. • 1290-D
Reamwood Ave., Sunnyvale, CA 94089
Phone: (408) 744-9040 • Fax: (408) 744-9049 • email: info@thinkSRS.com
• www.thinkSRS.com
© Stanford Research Systems, Inc. 2003
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