Integrated Circuit - SSI2131, VCO, Sound Semiconductor

Integrated Circuit - SSI2131, VCO, Sound Semiconductor

Sound Semiconductor
Integrated Circuit - SSI2131, VCO, Sound Semiconductor image 1
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The FatKeys™ SSI2131 Voltage Controlled Oscillator provides the core VCO function with buffered triangle, sawtooth, and variable-width pulse waveform outputs over a ten-octave range. The device offers unparalleled temperature stability, exponentiality, waveform integrity, and ease of use while requiring an absolute minimum of external components.

The SSI2131 is a new-generation voltage controlled oscillator for high-performance electronic musical instruments and other systems requiring accurate audio-band waveform generation. The device offers unprecedented levels of temperature stability, exponentiality, waveform integrity, and ease of use. Buffered voltage outputs include triangle, sawtooth, and pulse with PWM control.

A precision analog multiplier provides temperature stability, and careful attention was paid to improvement of triangle and sawtooth waveform accuracy compared to previous generation VCO IC’s.

Optional trims are possible for exponential scale and high frequency tracking which can be automated by CPU-calibrat- ed systems. The SSI2131 requires an absolute minimum of external components and is available in an easy-to-use 16-lead SOP package.

For equivalent VCO performance with more features, please see the SSI2130 which adds an integrated five-channel mixer, open-collector square output, sine wave generator, and through-zero FM/PM capability.


  • High Performance Synth Voice Front-End
  • Triangle, Saw, and Pulse with PWM Control
  • Unprecedented Temperature Stability
  • High-Integrity Waveforms
  • Superb Exponential Response
  • Buffered Waveform Outputs
  • Extremely Low External Component Count
  • Easy-to-Use 16-Lead SOP Package
Item ID:
Sound Semiconductor Part Number:
Sound Semiconductor
Absolut Max.Lead Temperature Range (Soldering, 10 sec)260°C
Absolut Max. Negative Supply Voltage-18 V
Absolut Max. Operating Temperature Range-40°C to +85°C
Absolut Max. Positive Supply Voltage+5.25 V
Absolut Max. Storage Temperature Range-65°C to +150°C
Max Supply Voltage Range - Negative-18 V
Max Supply Voltage Range - Positive+5.25 V
Max VREF Range2.51 V
Min Supply Voltage Range - Negative-4.75 V
Min Supply Voltage Range - Positive+4.75 V
Min VREF Range2.49 V
Package16-Lead SOP
Typ Expo. Conv. Control Constant - Expo20 µA/Oct
Typ Expo. Conv. Exponential Conformity0.3%
Typ Expo. Conv. Exponential Scale Factor Drift200 ppm/°C
Typ Expo. Conv. Multiplier Input Bias Current10 nA
Typ Expo. Conv. Multiplier Offset0.5 mV
Typ Osc. Sync Hard Sync Lower Threshold1.0 V
Typ Osc. Sync Hard Sync Upper Threshold1.55 V
Typ Osc. Sync Soft Sync Input Resistance5 kΩ
Typ Pulse/PWM Fall Time125 ns
Typ Pulse/PWM Lower Level-34 mV
Typ Pulse/PWM Maximum Output Source Current6 mA
Typ Pulse/PWM PWM Bias Current40 nA
Typ Pulse/PWM Rise Time70 ns
Typ Pulse/PWM Upper Level2.5 V
Typ Saw Discharge Time1.6 µs
Typ Saw Lower Level0 V
Typ Saw Maximum Output Current6 mA
Typ Saw Upper Level2.5 V
Typ Supply Current - Negative-2.90 mA
Typ Supply Current - Positive3.75 mA
Typ Supply Voltage Range - Positive+5 V
Typ Tri. Lower Level0 V
Typ Tri. Maximum Output Sink Current1 mA
Typ Tri. Maximum Output Source Current6 mA
Typ Tri. Upper Level2.5 V
Typ VCO Frequency Sweep Range1000:1
Typ VCO Maximum Charging Current1.2 mA
Typ VCO Maximum Operating Frequency60 kHz
Typ VREF Current Consumption100 mA
Typ VREF Range2.5 V
Packaging Information
Packaging Dimensions0.396 in. × 0.233 in. × 0.056 in.
Weight (Packaging)0.0018 lbs.
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