Synthesized Function Generators
DS340 — 15 MHz function and arbitrary waveform generator

DS340 Function/Arb Generator· 1 µHz to 15.1 MHz frequency range· 1 µHz frequency resolution· Sine, square, ramp, triangle & noise· Phase-continuous frequency sweeps· 16,300 point arbitrary waveforms· FSK modulation· RS-232 and GPIB interfaces (opt.)

The DS340 is a 15 MHz function and arbitrary waveformgenerator based on Direct Digital Synthesis (DDS). A
combination of features, performance and low cost make theDS340 ideal for a variety of test and measurement applications.
Sine waves and square waves can be generated at frequencies
up to 15.1 MHz, and ramps and triangles up to 100 kHz.
Frequency resolution is 1 µHz for all functions. The DS340
also includes a 10 MHz Gaussian white-noise generator.
All functions can be swept logarithmically or linearly in aphase-continuous fashion over the entire frequency range ofthe instrument. A rear-panel SWEEP output provides a trigger
signal at the start of a sweep to allow synchronization of
external devices. Both unidirectional and bidirectional sweeps
can be selected.
Up to 16,300 arbitrary waveform points can be downloaded
to the DS340’s waveform memory via the optional GPIB or
RS-232 interfaces. PC software is provided for composing,editing and downloading arbitrary waveforms. The waveform
memory can be played back at rates up to 40 Msamples/s.
Both internal and external FSK modes allow the output
frequency to be rapidly toggled between two preset values.
FSK toggling can be done internally (at rates up to 50 kHz),or externally via a rear-panel input.

Stanford Research Systems

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

DS340 SpecificationsFrequency Range

FSK Modulation
Max. Freq.
15.1 MHz15.1 MHz
100 kHz100 kHz
10 MHz10 MHzSine
SquareRamp
Triangle
Noise
Arbitrary

Resolution
1 µHz
1 µHz
1 µHz
1 µHz
(Gaussian weighting)
40 MHz/N (sample rate)

OutputModes
Max. rate
External FSK

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

SweepsType

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

Span

Source impedance
Grounding

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

Amplitude
Range
Resolution
OffsetOffset resolution
Accuracy

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

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

GeneralInterfaces

Sine Wave
Non-volatile memory
Spurious response<–65 dBc to 1 MHz (increasing by
6 dB/oct above 1 MHz)

Harmonic distortion
DC to 20 kHz<–70 dBc
20 kHz to 100 kHz <–60 dBc
100 kHz to 1 MHz <–50 dBc
1 MHz to 15 MHz <–40 dBc
Phase noise<–55 dBc (30 kHz band centeredon carrier)Dimensions
WeightPower
Warranty

Optional RS-232 and GPIB withDOS based arbitrary waveform
software (AWC). All instrument
functions can be controlled
over interfaces.
Up to nine sets of instrument
settings can be stored and recalled.
8.5" × 3.5" × 13" (WHD)
8 lbs.
35 W, 100/120/220/240 VAC,
50/60 HzOne year parts and labor on defects
in materials and workmanship

Square Wave
Rise/fall time
Asymmetry
Overshoot<15 ns ± 5 ns (10 % to 90 %)<3 ns + 1 % of period<2 % (full-scale output)

Ramps and Triangles
Rise/fall time
Linearity
Settling time

45 ns (10 MHz Bessel filter)±0.1 % of full scale
200 ns (0.5 % of final value)

Ordering Information

Arbitrary Waveforms
Sample rate
Waveform length
Vertical resolution
Rise/fall time

DS340 rear panel (w/ Opt. 01)

40 MHz or integer sub-multiples
8 to 16,300 points
12 bits
45 ns (10 MHz Bessel filter)

Stanford Research Systems

DS340
Option 01
Option 02
O345RMD
O345RMS

15 MHz function/arb. generator
GPIB, RS-232 and arb. software
2 ppm TCXO timebase
Double rack mount kit
Single rack mount kit

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