Synthesized Function Generators
DS335 — 3 MHz function generator

DS335 Function Generator· 1 µHz to 3.1 MHz frequency range· 1 µHz frequency resolution· Sine, square, ramp, triangle & noise· Phase-continuous frequency sweeps· FSK modulation· 10 Vpp into 50 Ω
· RS-232 and GPIB interfaces (opt.)

The DS335 is a simple, low-cost, 3 MHz function generator
designed for general benchtop or ATE applications. Basedon a Direct Digital Synthesis (DDS) architecture, the DS335
includes features not normally found in function generators inthis price range.
Basic functions include sine waves and square waves (upto 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 aphase-continuous fashion over the entire frequency range. A
rear-panel SWEEP output marks the beginning of a sweep toallow synchronization of external devices. Both unidirectionaland bidirectional sweeps can be selected.
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, orexternally via a rear-panel input.
Outputs have the low phase noise inherent to DDS. Wideband 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.

· DS335 ... $1395 (U.S. list)

Stanford Research Systems

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.

phone: (408)744-9040
www.thinkSRS.com

DS335 Specifications

Frequency Range

SweepsMax. Freq.
3.1 MHz
3.1 MHz
10 kHz
10 kHz
3.5 MHz

Sine
SquareRampTriangle
NoiseResolution
1 µHz
1 µHz
1 µHz
1 µHz
(Gaussian weighting)Type

Linear and logarithmic(phase continuous)
Linear (full frequency range),log (6 decades)
0.01 Hz to 1 kHz

Span
Sweep rate
Timebase Accuracy

OutputSource impedance
Grounding

50 Ω
Output may float up to ±40 V(AC + DC)

±5 ppm (20 °C to 30 °C)
TCXO, 2 ppm stability,
2 ppm aging (20 °C to 50 °C)

Standard
Optional

GeneralAmplitude
Range
Resolution
OffsetOffset resolution
Accuracy

50 mVpp to 10 Vpp (50 Ω),
100 mVpp to 20 Vpp (Hi-Z)
3 digits (DC offset = 0 V)
±5 VDC (50 Ω), ±10 VDC (Hi-Z)
3 digits
0.1 dB (sine output)

Interfaces

Non-volatile memory
Dimensions
WeightPower

Sine Wave
Warranty
Spurious response<–65 dBc to 1 MHz<–55 dBc to 3.1 MHz

Optional RS-232 and GPIB. All
instrument functions arecontrollable over the interfaces.
Up to nine sets of instrument
settings may be stored and recalled.
8.5" × 3.5" × 13" (WHD)
8 lbs.
22 W, 100/120/220/240 VAC,
50/60 HzOne year parts and labor on defects
in materials and workmanshipHarmonic distortion
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 centeredon carrier)
Square Wave
Rise/fall time
Asymmetry
Overshoot<15 ns ± 5 ns (10 % to 90 %)<3 ns + 1 % of period<5 % (full-scale output)

Ramps and Triangles
Rise/fall time
Linearity
Settling time

DS335 rear panel (with Opt. 01)
100 ns±0.1 % of full scale
200 ns (0.5 % of final value)

FSK ModulationModes
Max rate
External FSK

Internal, External
50 kHz, internal
TTL input, 1 MHz (max.)

Stanford Research Systems

Ordering Information
DS335
Option 01
Option 02
O345RMD
O345RMS

3 MHz function generator
GPIB and RS-232 interfaces
2 ppm TCXO timebase
Double rack mount kit
Single rack mount kit

phone: (408)744-9040
www.thinkSRS.com