Stanford Research Systems DS335 Data Sheet

· 1 µµHz to 3.1 MHz frequency range

· 1 µµHz frequency resolution

· Sine, square, ramp, triangle & noise

· Phase-continuous frequency sweeps

· FSK modulation

· 10 Vpp into 50

ΩΩ

· RS-232 and GPIB interfaces (opt.)

· DS335 ... $1095

(U.S. list)

Stanford Research Systems phone: [phone]

www.thinkSRS.com

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 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.

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.

DS335 Function Generator

Synthesized Function Generators

DS335  3 MHz function generator

www.thinkSRS.com

Frequency Range

Max. Freq. 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 (Hi-Z)

Resolution 3 digits (DC offset = 0V)
Offset ±5 VDC (50 Ω), ±10 VDC (Hi-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

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 % (full-scale 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.)

DS335 Specifications

Stanford Research Systems phone: [phone]

www.thinkSRS.com

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" (WHD)
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

Ordering Information

DS335 3 MHz function generator $1095
Option 01 GPIB and RS-232 interfaces $495
Option 02 2 ppm TCXO timebase $350
O335RMD Double rack mount kit $85
O335RMS Single rack mount kit $85

DS335 rear panel (with opt. 01)