Synthesized Function Generators DS345 — 30 MHz function and arbitrary waveform generator DS345 Function/Arb Generator The DS345 is a full-featured 30 MHz synthesized function · 1 µHz to 30.2 MHz frequency range generator that uses an innovative Direct Digital Synthesis (DDS) architecture. It generates many standard waveforms · 1 µHz frequency resolution with excellent frequency resolution (1 µHz), and has versatile modulation capabilities including AM, FM, Burst, PM and frequency sweeps. It also generates arbitrary waveforms with · Sine, square, ramp, triangle & noise a fast 40 Msamples/s update rate. · Phase-continuous frequency sweeps Functions and Outputs · AM, FM, burst and phase modulation The DS345 generates sine waves and square waves at frequencies up to 30.2 MHz, and triangle and ramp waveforms · 16,300 point arbitrary waveforms up to 100 kHz. The frequency resolution for all functions is 1 µHz. In addition to the standard waveforms, the unit also · 10 MHz reference input provides a wideband (10 MHz) white noise source. · RS-232 and GPIB interfaces (opt.) Both the function output and a TTL SYNC output are available through floating, front-panel BNC connectors. Both outputs have 50 Ω output impedances and may be floated up to ±40 V relative to earth ground. The amplitude of all function outputs is adjustable from 10 mVpp to 10 Vpp with 3-digit resolution, and can be displayed in Vp, Vpp, Vrms or dBm. In addition, standard TTL and ECL output levels can be selected. Additional useful connectors are provided on the rear panel. A trigger input is used to trigger arbitrary waveforms, · DS345 ... $1595 (U.S. list) modulation patterns, sweeps and bursts, while a TTL trigger output is provided to allow synchronization of external Stanford Research Systems phone: (408)744-9040 www.thinkSRS.com DS345 Function/Arbitrary Waveform Generator devices to sweeps and bursts. A sweep output generates a 0 to 10 V ramp synchronous with frequency sweeps. The sweep marker outputs allow specified portions of a frequency sweep to be highlighted on an oscilloscope. A 10 MHz rear-panel input allows the DS345 to be synchronized to an external timebase. A 10 MHz rear-panel output allows multiple DS345s to be phase locked together. Phase modulation selected with 1 % resolution. Negative values of modulation correspond to Double Sideband Suppressed Carrier (DSBSC) modulation. FM spans can be selected with 1 µHz resolution, and phase modulation can be set between 0° and 7200° with 0.001° resolution. External Amplitude Modulation Square, triangle and ramp waveforms In addition to the internal modulation generator, the output waveform can be amplitude modulated by an external signal Modulation applied to the rear-panel AM input. This input is always active — even when other modulation types are turned on. The DS345 offers a wide variety of modulation options. It contains an internal modulation generator which can modulate any of its standard waveforms except noise. The modulation waveform can be a sine, square, triangle, ramp or an arbitrary waveform. Modulation rates from 1 mHz to 10 kHz can be selected. The modulation generator can provide amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM). When using AM, modulation depths of ±100 % can be Amplitude modulation Burst Modulation You can generate tone bursts of any output function except noise. In burst mode, the DS345 will output an exact number of complete waveform cycles after receiving a trigger. By adjusting the phase, you can control where in the waveform Frequency modulation the burst begins. While using burst mode, the maximum Stanford Research Systems phone: (408)744-9040 www.thinkSRS.com DS345 Function/Arbitrary Waveform Generator Arbitrary Waveform Capability The DS345 isn’t just a function generator. It’s also a full- featured arbitrary waveform generator. Output waveforms have 12-bit vertical resolution, and can be played back at rates up to 40 Msamples/s. Since composing complex arbitrary waveforms at the keyboard can be a tedious task, Arbitrary Waveform Composer (AWC) software is provided at no charge. AWC is a menu-based program which lets you create and edit arbitrary waveforms on the screen, store them, and download them to the DS345. Burst modulation frequency for sine waves and square waves is 1 MHz, while triangles and ramps are limited to 100 kHz. Burst mode may be used with arbitrary waveforms at any frequency. Frequency Sweeps The DS345 can frequency sweep any of its function outputs (except noise). You can sweep up or down in frequency using linear or log sweeps. Unlike conventional function generators, there are no annoying discontinuities or band-switching artifacts when sweeping through certain frequencies. The DS345’s DDS architecture inherently allows it to perform smooth, phase-continuous sweeps over it’s entire frequency range. Arbitrary waveform Two sweep marker frequencies can be specified. When the sweep crosses either of the marker frequencies, a TTL transition is generated at the rear-panel MARKER output to allow synchronization of external devices. AWC software Frequency sweep Stanford Research Systems phone: (408)744-9040 www.thinkSRS.com DS345 Specifications Frequency Range Harmonic distortion Level Frequency Range <–55 dBc DC to 100 kHz <–45 dBc 0.1 MHz to 1 MHz Max. Freq. Resolution <–35 dBc 1 MHz to 10 MHz Sine 30.2 MHz 1 µHz Square 30.2 MHz 1 µHz <–25 dBc 10 MHz to 30 MHz Ramp 100 kHz 1 µHz Triangle 100 kHz 1 µHz Square Wave Noise 10 MHz (Gaussian weighting) Rise/fall time <15 ns (10 % to 90 %), at full output Arbitrary 10 MHz 40 MHz/N (sample rate) Asymmetry <1 % of period + 4 ns Overshoot <5 % of peak to peak amplitude at Output full output Ramps, Triangle and Arbitrary Waveforms Source impedance 50 Ω Grounding Output may float up to ±40 V (AC + DC) relative to earth ground. Rise/fall time 45 ns (10 MHz Bessel filter) Linearity ±0.5 % of full-scale output Settling time <1 µs to settle within 0.1 % of final Amplitude value at full output Range 0.01 to 10 Vpp (50 Ω), 20 Vpp (Hi-Z) Arbitrary Waveforms Resolution 3 digits (DC offset: 0 V) 34 Sample rate 40 MHz/N, N = 1 to 2 – 1 Sine wave accuracy (0 VDC offset) Memory length 8 to 16,300 points 5 to 10 Vpp ±0.2 dB (1 µHz to 20 MHz) ±0.3 dB (20 MHz to 30.2 MHz) Resolution 12 bits (0.025 % of full scale) 0.01 to 5 Vpp ±0.4 dB (1 µHz to 20 MHz) ±0.5 dB (20 MHz to 30.2 MHz) Phase Square wave accuracy Range ±7199.999° with respect to arbitrary 5 to 10 Vpp ±3 % (1 µHz to 100 kHz) ±6 % (100 kHz to 20 MHz) starting phase ±15 % (20 MHz to 30.2 MHz) Resolution 0.001° 0.01 to 5 Vpp ±5 % (1 µHz to 100 kHz) Amplitude Modulation ±8 % (100 kHz to 20 MHz) ±18 % (20 MHz to 30.2 MHz) Triangle, ramp and ±3 % (>5 Vpp) Source Internal (sine, square, triangle or arbitrary accuracy ±5 % (<5 Vpp) ramp) or External Depth 0 to 100 % AM or DSBSC Rate 0.001 Hz to 10 kHz (internal), DC Offset 15 kHz max. (external) Range ±5 V (limited such that Distortion <–35 dB at 1 kHz, 80 % depth |VAC peak| + |VDC| < 5 V) DSB carrier <–35 dB (typ.) at 1 kHz modulation Resolution 3 digits (VAC = 0) rate (DSBSC) External input ±5 V for 100 % modulation, Accuracy 1.5 % of setting + 0.2 mV 100 kΩ impedance, 15 kHz BW (DC only) ±0.8 mV to ±80 mV, depending on AC and DC settings Frequency Modulation Source Internal (sine, square, triangle, ramp Sine Wave or arbitrary) Spurious components <–55 dBc (non-harmonic) Rate 0.001 Hz to 10 kHz Phase noise <–50 dBc in a 30 kHz band Span 1 µHz to 30.2 MHz (100 kHz for centered on the carrier, exclusive of triangle, ramp) discrete spurious signals Sub-harmonic <–50 dBc Stanford Research Systems phone: (408)744-9040 www.thinkSRS.com DS345 Specifications Phase Modulation General Source Internal (sine, square, triangle, ramp) Interfaces Opt. RS-232 (300 to 19.2 kbaud, Rate 0.001 Hz to 10 kHz DCE) and GPIB with DOS Span ±7199.999° based arbitrary waveform software (AWC). All instrument Frequency Sweep functions are controllable over the interfaces. Type Linear or log, phase continuous Non-volatile memory Nine sets of instrument settings can Waveform Up, down, up-down, single sweep be saved and recalled. Time 0.001 s to 1000 s Dimensions 8.5" × 3.5" × 13" (WHD) Span 1 µHz to 30.2 MHz (to 100 kHz for Weight 10 lbs. triangle, ramp) Power 50 W, 100/120/220/240 VAC, Markers Two markers may be set at any 50/60 Hz sweep point (TTL output) Warranty One year parts and labor on defects Sweep output 0 to 10 V linear ramp signal, in materials and workmanship synchronized to sweep Burst Modulation Waveform Any waveform except noise may be burst modulated. Frequency Sine and square to 1 MHz, Triangle and ramp to 100 kHz, Arbitrary to 40 MHz sample rate Count 1 to 30,000 cycles/burst (1 µs to 500 s burst time limits) Trigger Generator Source Single, Internal, External, Line Rate (internal) 0.001 Hz to 10 kHz (2-digit resolution) DS345 rear panel (with Opt. 01) External trigger Positive or negative edge, TTL Output TTL level Standard Timebase Accuracy ±5 ppm (20 °C to 30 °C) Aging 5 ppm/year Input 10 MHz/N ± 2 ppm (N = 1 to 8), 1 Vpp minimum input level Output 10 MHz, >1 Vpp sine into 50 Ω Ordering Information Optional Timebase DS345 30 MHz function/arb. generator $1595 Option 01 GPIB, RS-232 and arb. software $495 Option 02 10 ppb OCXO timebase $650 Type Ovenized AT-cut oscillator O345RMD Double rack mount kit $100 Stability <0.01 ppm, 20 °C to 60 °C O345RMS Single rack mount kit $100 Aging <0.001 ppm/day –11 Allan variance (1 s) <5 × 10 Stanford Research Systems phone: (408)744-9040 www.thinkSRS.com