Integrated Circuit - SSI2131, VCO, Sound Semiconductor
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.
Features:
- 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
Accessory Items:
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 Range | 2.51 V | ||
Min Supply Voltage Range - Negative | -4.75 V | ||
Min Supply Voltage Range - Positive | +4.75 V | ||
Min VREF Range | 2.49 V | ||
Package | 16-Lead SOP | ||
Typ Expo. Conv. Control Constant - Expo | 20 µA/Oct | ||
Typ Expo. Conv. Exponential Conformity | 0.3% | ||
Typ Expo. Conv. Exponential Scale Factor Drift | 200 ppm/°C | ||
Typ Expo. Conv. Multiplier Input Bias Current | 10 nA | ||
Typ Expo. Conv. Multiplier Offset | 0.5 mV | ||
Typ Osc. Sync Hard Sync Lower Threshold | 1.0 V | ||
Typ Osc. Sync Hard Sync Upper Threshold | 1.55 V | ||
Typ Osc. Sync Soft Sync Input Resistance | 5 kΩ | ||
Typ Pulse/PWM Fall Time | 125 ns | ||
Typ Pulse/PWM Lower Level | -34 mV | ||
Typ Pulse/PWM Maximum Output Source Current | 6 mA | ||
Typ Pulse/PWM PWM Bias Current | 40 nA | ||
Typ Pulse/PWM Rise Time | 70 ns | ||
Typ Pulse/PWM Upper Level | 2.5 V | ||
Typ Saw Discharge Time | 1.6 µs | ||
Typ Saw Lower Level | 0 V | ||
Typ Saw Maximum Output Current | 6 mA | ||
Typ Saw Upper Level | 2.5 V | ||
Typ Supply Current - Negative | -2.90 mA | ||
Typ Supply Current - Positive | 3.75 mA | ||
Typ Supply Voltage Range - Positive | +5 V | ||
Typ Tri. Lower Level | 0 V | ||
Typ Tri. Maximum Output Sink Current | 1 mA | ||
Typ Tri. Maximum Output Source Current | 6 mA | ||
Typ Tri. Upper Level | 2.5 V | ||
Typ VCO Frequency Sweep Range | 1000:1 | ||
Typ VCO Maximum Charging Current | 1.2 mA | ||
Typ VCO Maximum Operating Frequency | 60 kHz | ||
Typ VREF Current Consumption | 100 mA | ||
Typ VREF Range | 2.5 V |
Packaging Dimensions | 0.396 in. × 0.233 in. × 0.056 in. | ||
Weight (Packaging) | 0.0018 lbs. |
![]() | All Models |