DS340

The Stanford Research Systems DS340 is a 15 MHz function and arbitrary waveform generator utilizing Direct Digital Synthesis (DDS). Designed for versatile test and measurement applications, it delivers high frequency resolution, low distortion sine and square waves up to 15.1 MHz, ramps up to 100 kHz, and Gaussian white noise up to 10 MHz. It also features up to 16,300 point arbitrary waveforms with a 40 MSamples/s playback rate, phase-continuous sweeps, and FSK modulation.

Arbitrary Waveform Generation Function Generation Signal Generation

Specifications

General

Parameter	Value
Interfaces	Optional RS-232 and GPIB (IEEE-488)
Display	12-digit LED display
Power Consumption	35 W

Physical

Parameter	Value
Power Supply	100 / 120 / 220 / 240 V AC, 50/60 Hz, 35 W
Operating Temperature	0 °C to 50 °C
Dimensions (W×H×D)	216 mm × 89 mm × 330 mm
Weight	3.6 kg

Channel Characteristics

Parameter	Value
Number of Channels	1

Waveform Generation

Parameter	Value
Standard Waveforms	Sine, Square, Triangle, Ramp, Gaussian Noise
Arbitrary Waveform Types	User-defined via GPIB / RS-232
Sampling Rate	Up to 40 MSamples/s (arbitrary playback rate)
Vertical Resolution	12 bits
Maximum Waveform Length	16,300 points

Frequency Specifications

Parameter	Value
Sine Frequency Range	1 µHz to 15.1 MHz
Square Frequency Range	1 µHz to 15.1 MHz
Ramp/Triangle Frequency Range	1 µHz to 100 kHz
Noise Bandwidth	10 MHz
Frequency Resolution	1 µHz
Frequency Accuracy	±5 ppm (0 °C to 50 °C)
Aging Rate	< 5 ppm/year

Sine Wave Distortion and Purity

Parameter	Value
Harmonic Distortion (DC to 20 kHz)	<-55 dBc
Harmonic Distortion (20 kHz to 1 MHz)	<-45 dBc
Harmonic Distortion (1 MHz to 15 MHz)	<-35 dBc
Spurious Noise (DC to 1 MHz)	<-50 dBc
Spurious Noise (1 MHz to 15 MHz)	<-40 dBc

Pulse & Square Wave Characteristics

Parameter	Value
Rise/Fall Time	< 15 ns (10% to 90%)
Overshoot	< 5% (at full output)

Amplitude and Output Characteristics

Parameter	Value
Amplitude Range (into 50 Ω)	50 mVpp to 10 Vpp
Amplitude Range (into Open Circuit)	100 mVpp to 20 Vpp
Amplitude Resolution	3 digits
Amplitude Accuracy	±0.2 dB (0.1 Hz to 1 MHz, 1 Vpp)
Amplitude Flatness (1 MHz to 15 MHz)	±0.3 dB (1 Vpp)
DC Offset Range (into 50 Ω)	±5 V
DC Offset Range (into Open Circuit)	±10 V
Output Impedance	50 Ω ±1%
Output Protection	Short-circuit protected, ±15 V overvoltage protection

Modulation, Sweep, and Burst

Parameter	Value
Modulation Types	FSK
Internal FSK Rate	0.01 Hz to 50 kHz
External FSK Rate	Up to 50 kHz
Sweep Type	Linear or Logarithmic
Sweep Time Range	1 ms to 1000 s
Sweep Direction	Up or down

Clock, Trigger, and Synchronization

Parameter	Value
Internal Reference Frequency	10 MHz
External Reference Input	10 MHz (TTL level)
Sweep Output	0 to 10 V sweep ramp

Phase

Parameter	Value
Phase Range	-360° to +360°
Phase Resolution	0.001°

Performance

Parameter	Value
Phase Noise	<-55 dBc (in a 30 kHz band centered on carrier, excluding a 1 Hz band around carrier)
Subharmonic Spurious	<-50 dBc

Output

Parameter	Value
Amplitude Flatness (0.1 Hz to 1 MHz)	±0.1 dB

Inputs & Outputs

Parameter	Value
Sync Output Level	TTL
Sync Output Impedance	50 Ω
Trigger Input Impedance	10 kΩ
Trigger Input Level	TTL
External Reference Input Frequencies	10 MHz
External Reference Input Minimum Level	TTL level
Reference Output Frequency	10 MHz
Reference Output Level	TTL
Reference Output Impedance	50 Ω
Sweep Output Voltage Range	0 V to 10 V
Sweep Output Impedance	600 Ω
Trigger/FSK Input Minimum Pulse Width	1 µs

Timebase

Parameter	Value
Standard Timebase Temperature Stability	< 5 ppm (0 °C to 50 °C)
Optional Ovenized Timebase Temperature Stability (Opt 01)	< 2 × 10^-8 (0 °C to 50 °C)

Arbitrary Waveform

Parameter	Value
Minimum Waveform Length	8 points

Modulation

Parameter	Value
FSK Shift Range	1 µHz to 15.1 MHz

Waveform Characteristics

Parameter	Value
Square Wave Symmetry	50 % ± 1 % of period
Ramp Linearity	< 0.1 % of full scale (to 10 kHz)
Arbitrary Waveform Rise/Fall Time	< 35 ns
Arbitrary Waveform Sampling Rate Divider	1 to 2^34 - 1

Amplitude & Offset

Parameter	Value
DC Offset Resolution	3 digits
DC Offset Accuracy	±(1.5 % of setting + 2 mV)

Sweep

Parameter	Value
Sweep Span	1 µHz to 15.1 MHz

Interfaces

Parameter	Value
Interface Options	GPIB (IEEE-488.2) and RS-232 (Option 02)

Technology

Direct Digital Synthesis (DDS)

Applications

Test and measurement