Synth Function ICs

The CEM range of synth chips featured in numerous commercial and DIY synths in the 80’s before they ceased production. A number of the chips have been remanufactured by a Latvian electronics company and we delighted to be able to offer them through Soundtronics.  The AS3310 is a self-contained, precision ADSR type of envelope generator intended for electronic music and other sound generation applications. Attack, decay and release times are exponentially voltage controllable over a wide range, and the sustain level is linearly voltage controllable from 0 to 100% of the peak voltage Vp. All four control Inputs are Isolated from the rest of the circuitry so that the control pins of tracking units may be simply tied together. Features                                                                            Large Time Control Range: 100,000:1 Full ADSR Response True RC Envelope Shape Exceptionally Low Control Voltage Feed through: 90μVmax Accurate Exponential Time Control Scales Isolated Control Inputs Good Repeatability and Tracking Between Units Without External Trim Independent Gate and Trigger Wide power supply range: negative rail: -15V to -9V (via external resistor), positive rail: +11V to +15V

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The К1100СК2B is a monolithic sample-and-hold (SHA) circuit, controlled by signal LOGIC, stores the instantaneous values of the input signal and for a certain time maintain a constant DC voltage at the output with a high accuracy.The wide bandwidth allows the K1100CК2B to be included inside the feedback loop of 1 MHz op amps without having stability problems. Input impedance of 1010Ω allows high source impedances to be used without degrading accuracy.The overall design ensures no feedthrough from input to output in the hold mode, even for input signals equal to the supply voltages. Logic inputs on the K1100К2B are fully differential with low input current, allowing for direct connection to TTL, PMOS, and CMOS. Differential threshold is 1.4 V. The K1100CК2B will operate from ±5V to ±15V supplies.The K1100CК2B OUTPUT tracks the INPUT signal by charging and discharging the hold capacitor (CH). The OUTPUT can be held at any given time by pulling the LOGIC input low relative to the LOGIC REFERENCE voltage and resume sampling when LOGIC returns high. Additionally, the OFFSET pin can be used to zero the offset voltage present at the INPUT.The nominal value of the supply voltage UСС1,2=±12V for К1100СК2B.Supplied in TO5-8.

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The AS3364 is a quad general purpose voltage linearly controlled VCA intended for such applications asvoltage controlled amplifiers, filters, and waveform generators. Each VCA independently provides linear control scaling over greater than a 100 dB range. Complete with virtual ground summing inputs, wide voltage compliance current outputs, and control inputs referenced to ground, the AS3364 requires exceptionally few external components and is extremely easy to use.Because of its inherent ultra-low control feedthrough, no trimming is required. Added to these features are exceptionally low noise, wide bandwidth, and operation down to ± 3 volts, making the AS3364 a real cost saver in most applications requiring variable transconductance amplifiers.AS3364 pinout allows simple replacement of AS2164 (adding just one capacitor to Vref) witch simplify circuit design with linear control.Features “Linear replacement” – “pin compatible” to AS2164 Exceptionally low control feedthrough without trimming: 10mV maximum out of 10 V.P.P. output Low noise: -110 dB typical Summing node signal Inputs Current outputs capable of swinging to within 1,5V of each supply Control voltages referenced to ground Wide supply range: ±3 to ±12V or +15, - 3 to - 9 V

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AS2164 contains four independent voltage controlled amplifiers (VCAs) in a single package. High performance (dynamic range 100 dB) provides excellent use of VCA's in gain control applications. Each VCA offers current inputs and outputs for maximum design flexibility, as well as a –33 mV/ dB ground control port.All channels are closely matched to within 0,07 dB at unity gain, and 0,24 dB at 40 dB of attenuation. A 120 dB gain range is possible.A single resistor tailors operation between full Class A and AB modes. The AS2164 is internally protected in situations where negative supply is turned OFF. The AS2164 will operate over a wide supply voltage range of ±4 V to ±18 V. Features Protection from negative supply turned OFF Four high performance VCAs in a single package No external trimming 120 dB gain range 0.07 dB gain matching (unity gain) Class A or AB operation PDIP-16 Applications Remote, Automatic, or Computer Volume Controls Automotive Volume/Balance/Faders Compressor/Limiters/Compandors Noise Reduction Systems Automatic Gain Controls Voltage Controlled Filters Special Sound Processors

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AS3363 contains three VCA blocks, which are intended for use in musical synthesizer applications (VCA blocks, voltage polarizer, multiplexers, morphing, ring modulators etc.). VCA1 and VCA2 implement function of controlling amplification and sign of output signal (voltage polarizing - changing sign and amplitude through “silence”). Additional control input controls attenuation of output current - thus realizing function of double multiplication input signal on two control signals. VCA3 block has additional feature – possibility of control/mixingof two input signals. Such solution gives vast opportunities in designing new synth solutions.Features Three VCA blocks with a wide range of functions containing three 4-quadrant multipliers and 3 2-quadrant multipliers Two linear controls for each VCA Simple signal mixing Can combine high impedance outputs Provides high attenuation (-100 dB) Simplifies multiplexer design Low current consumption of 3 mA typ at ±12V

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The AS 3350 is a dual voltage controlled state-variable filter intended for electronic musical instruments and other signal processing applications. Each filter provides both voltage control of centre/cut-off frequency over more than 12 octaves and voltage control of Q from 1/2 to greater than 40. All control scales are exponential, allowing for easier control of the parameters over their wide range. Although the two filters are completely independent, they may be easily interconnected to form a wide variety of filter responses. Each filter also provides two signal inputs: For signals applied to the fixed gain input, the output will remain constant as the Q is varied, while for signals applied to the variable gain input, the output decreases as Q is increased. The input signal may be proportioned between these two inputs to provide any desired characteristic. Finally, each filter provides two simultaneous outputs, making directly available low-pass and band-pass, or bandpass and high-pass responses depending upon where the input signal is applied. Able to operate over a wide supply range, the versatile AS 3350 allows new and unique filter responses to be created with a high degree of voltage control over the defining parameters. Features Two Independent state variable filters Separate frequency and Q control Inputs for each channel Wide frequency sweep and Q control range Exponential control scales for both frequency and Q Two simultaneous outputs on each: Low-Pass and Band-Pass or Band-Pass and High-Pass possible Two simultaneous inputs for each: fixed gain and variable gain Configurable Into many V.C. filters Wide supply range: ±3V to ±16V

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The CEM range of synth chips featured in numerous commercial and DIY synths in the 80’s before they ceased production. A number of the chips have been remanufactured by a Latvian electronics company and we delighted to be able to offer them through Soundtronics.  The AS 3340 and AS 3345 are completely self-contained, precision voltage controlled oscillators, featuring both exponential and linear control scales and up to four buffered output waveforms: triangle, sawtooth, square, and pulse with voltage controllable pulse width. Full temperature compensation makes these VCOs extremely stable, and eliminates the need for a temperature compensation resistor. The highly accurate exponential and linear control inputs are virtual ground summing nodes, allowing multiple control voltages to be mixed within the device itself. The AS3345 has an additional square wave output at pin 7. Also included are the provisions for hard and soft synchronization of the frequency, and an output for easy adjustment of high frequency tracking. Special care in the design ensures oscillation start-up under any power-on sequence and supply conditions. Features                                                                            Large Sweep Range: 500,000:1 Fully Temperature Compensated Four Output Waveforms Available; No waveform trimming required Summing Node Inputs for Frequency Control High Exponential Scale Accuracy Low Temperature Drift Voltage Controlled Pulse Width Hard and Soft Sync Inputs Linear FM Buffered, Short Circuit Protected Outputs ±15 Volt Supplies

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The CEM range of synth chips featured in numerous commercial and DIY synths in the 80’s before they ceased production. A number of the chips have been remanufactured by a Latvian electronics company and we delighted to be able to offer them through Soundtronics. The AS 3330 is a dual, high performance, voltage controlled amplifier intended for electronic musical instrument and professional audio applications. Each amplifier includes complete circuitry for simultaneous linear and exponential control of gain. In addition, the operating point of the amplifiers may be set anywhere from Class В to Class A, allowing the user to optimize those parameters critical to the particular application. Also featured are virtual ground summing nodes for both the signal and linear control inputs, so that signal and control mixing may be accomplished within the device itself. VCA outputs are signal currents, allowing the device to be conveniently used in two-pole voltage controlled filters, as well as dual voltage controlled amplifiers. Features                                                                            two independent voltage controlled amplifiers simultaneous linear and exponential control Inputs wide control range: 120dB min. very accurate control scales for excellent gain tracking exceptionally low control voltage feedthrough < -90dB low distortion: < 0.1% exceptionally low noise: < -100dB operating point anywhere from Class B to Class A summing nodes for signal and linear control inputs current outputs for ease of use in voltage controlled 2-Pole Filters can be used in VCO and VCF control paths without causing shift ±15 volt supplies

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he CEM range of synth chips featured in numerous commercial and DIY synths in the 80’s before they ceased production. A number of the chips have been remanufactured by a Latvian electronics company and we delighted to be able to offer them through Soundtronics. The AS3320 is a high performance voltage controlled four-pole filter with on-chip voltage controllable resonance IC. The four independent sections may be interconnected to provide a wide variety of filter responses, such as low pass, high pass, band pass and all pass. A single input exponentially controls the frequency over greater than a ten octave range with little control voltage feed through. Another input controls the resonance in a modified linear manner from zero to low distortion oscillation. For those demanding applications, provision has been made to allow trimming for improved control voltage rejection. Each filter section features a variable gain cell which is fully temperature compensated, exhibits a better signal-to-noise ratio and generates its low distortion predominantly in the second harmonic. The device includes a minus two volt regulator to ensure low power dissipation and consequent low warm-up drift. Features                                                                            voltage controllable frequency - 12 octave range voltage controllable resonance - from zero to oscillation accurate exponential frequency scale accurate linear resonance scale low control voltage feedthrough -45dB typical filter configurable into LPF, HPF, all pass, etc. low noise: -86dB typical low distortion in passband - 0.1% typical low warm up drift configurable into low distortion voltage controlled sine wave oscillator bandwidth till 800kHz

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