Products of Alfa Rpar
Filter
Alfa Rpar - AS13704D - Quad Operational Transconductance Amplifiers (OTA)

available

The AS13704D consists of four current-controlled transconductance amplifiers OTA, each with differential inputs and a push-pull output. All amplifiers share common supplies, but operate independently. Linearizing diodes are provided at the inputs to reduce distortion and allow higher input levels. The result is a 10-dB signal-to-noise improvement referenced to 0.5 percent THD.Features:• gm adjustable over 6 decades• excellent gm linearity• excellent matching between amplifiers• linearizing diodes for reduced output distortion• high output SNR• LM13700 functional replacement (without output buffers)Applications:• current-controlled amplifiers• stereo audio amplifiers• current-controlled impedances• current-controlled filters• current-controlled oscillators• multiplexers• timers• S&H circuits
€4.00*
Alfa Rpar - AS16M1 - Serial Controlled SPCO Switch

available

The AS16M1 analog switch with serial digital interface offers 16 individually controlled single-pole-change-over (SPCO) switches. All switches conduct equally in either direction and on-resistance (170 Ω) is constant over the analog signal range.These CMOS switches can operate continuously with power supply +5V and switch input currents in any combination to output node (summing) or ground them.Upon power-up, all summing switches are off, grounding switches are on and the internal serial and parallel shift registers are reset to zero.The AS16M1 is controlled by a serial interface. The interface is compatible with the SPI interface standard.Features:• 16 individually serial controlled SPCO switches• SPI-compatible serial interface• multiple devices can be daisy chained• compact 28-Pin package: QFN-28Applications:• Electronic music• Instrumentation• Signal Routing• Audio commutation• Data Acquisition and Process Control
€7.00*
Alfa Rpar - AS177D - Ultraprecision Operational Amplifier

available

The AS177 op-amp has a very small offset voltage, which is achieved by trimming the microcircuit at the manufacturing stage and a wide range of supply voltages. The AS177 op-amp has low input currents and a high gain. Low offset voltage (UIO) and high gain (AU) make this op amp particularly attractive for use in instrumentation circuits.A wide input voltage range (UICMAX) in combination with a high common-mode input voltage attenuation coefficient (KCMR) and high impedance provides high accuracy for non-inverting switching circuits. In deep feedback circuits, high values of linearity and accuracy can be achieved. The op-amp has high and normalized stability of the offset voltage and the difference of the input currents (IIO) in time and from changes in ambient temperature.The accuracy and stability of the AS177, even at high gain, combined with the freedom from external nulling have made the AS177 an industry standard for instrumentation applications.Features:• Ultralow offset voltage TA = 25°C, 25 μV (typ)• Wide range of supply voltages from ±3V to ±16,5V• Outstanding offset voltage drift ± 0,1 μV/°С• High long-term stability offset voltage• Increased speed f1 – 0,9 MHz, SR-0,36 V/μS• Wide range of common mode input voltage ±13V• Small input current 2nA (max)• Excellent open-loop gain 10 V/μV typical• Common-Mode Rejection Ratio 120dB
€4.00*
Alfa Rpar - AS194H - Matched Transistor Pair

available

The AS194 and AS394 are junction isolated ultra well-matched monolithic NPN transistor pairs with an order of magnitude improvement in matching over conventional transistor pairs.Electrical characteristics of these devices such as drift versus initial offset voltage, noise, and the exponential relationship of base-emitter voltage to collector current closely approach those of a theoretical transistor. Extrinsic base and emitter resistances are very low, giving very low noise and operating over a wide current range.To guarantee long term stability of matching parameters, internal clamp diodes have been added across the emitter-base junction of each transistor. These prevent degradation due to reverse biased emitter current- the most common cause of field failures in matched devices. The parasitic isolation junction formed by the diodes also clamps the substrate region to the most negative emitter to ensure complete isolation between devices.The AS194H, AS394H, AS394CH are available in the 8-pin metal can TO5-8 package, the AS194DE and AS394DE in the 8-lead plastic SOIC-8 (150mil) EPAD package.Features:• "Ideal" and identical transistors• Common-mode rejection ratio > 120dB• Emitter-base offset voltage < 100v• Emitter-base offset voltage temperature drift 0.1µV/°C• Current gain (hFE) matched <2%• Parameters are guaranteed in the range of collector current of 10µA - 1mA• Noise Voltage Density of 1.8nV/srt(Hz)• Ideal logarithmic properties
€4.00*
Alfa Rpar - AS2164D - Quad VCA

available

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.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 negaive 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 operationApplications:• 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
€4.50*
Alfa Rpar - AS2180DE - Pre-trimmed Voltage Controlled Amplifier (VCA)

available

AS2180 voltage controlled amplifier (VCA) is a high performance current-in/current-out device with two opposing-polarity, voltage-sensitive control ports which offer wide-range exponential control of gain and attenuation with low signal distortion. AS2180 is trimmed at wafer stage for low THD and control-voltage feedthrough without further adjustment. Exposed pad has slight internal electrical contact with V- (pin 5).Features:• wide dynamic range > 120 dB• wide exponential gain range > 130 dB• low distortion < 0.01 %Applications:• Industrial control• Music devices• Filters, etc.
€8.00*
Alfa Rpar - AS2M1 - Tact switch (toggle) controller, SPDT analog switch

available

The AS2M1 is a tact switch controller with anti-bounce block, which “converts” tact switch into toggle switch and controls SPDT analog switch with (LED) indication on digital output status of toggle switch.During Power-On NС input is connected to COM and OUT is switched to +Vсс. If “high-current”-signal is applied to SW, after anti-bounce delay (approximately 80 ms) , internal trigger change it’s status and switching SPDT switch and Out.Inputs SW and R are current inputs. If current flowing out from SW or R is less than 100 uA, then input level is high. If external circuit sources from those inputs more than 100 uA, then input level is low.Transition from high level to low level leads to change of status of internal trigger (after anti-bounce delay).Low level on Reset input resets internal trigger to initial state. During low level on Reset input controller don’t response on SW input.Features:• Anti-bounce > 80 ms (typ)• Flexible control• High-voltage +/-12V• Analog switchApplications:• Industrial control• Music devices• HMI
From €6.00*
Alfa Rpar - AS301AN - Operational Amplifier

available

The AS301A is a general purpose operational amplifier. This amplifier offers many features which make its application nearly foolproof: overload protection on the input and output, no latch-up when the common mode range is exceeded, and freedom from oscillations and compensation with a single 30 pF capacitor. It has advantages over internally compensated amplifiers in that the frequency compensation can be tailored to the particular application.For example, in low frequency circuits it can be overcompensated for increased stability margin. Or the compensation can be optimized to give more than a factor of ten improvements in high frequency performance for most applications.In addition, the device provides better accuracy and lower noise in high impedance circuitry. The low input currents also make it particularly well suited for long interval integrators or timers, sample and hold circuits and low frequency waveform generators. Further, replacing circuits where matched transistor pairs buffer the inputs of conventional IC op amps, it can give lower offset voltage and a drift.The AS301A is guaranteed over a temperature range of 0 °C to +70 °C and maintains performance at -45 °CAnd +85 °C.
€5.50*
Alfa Rpar - AS3046D - NPN Transistor Array

available

The AS3046 consists of five general purpose silicon NPN transistors on a common monolithic substrate. Two of the transistors are internally connected to form a differentially-connected pair. The transistors are well suited to a wide variety of applications in low power system. They may be used as discrete transistors in conventional circuits however, in addition, they provide the very significant inherent integrated circuit advantages of close electrical and thermal matching.Features:• matched pair of npn transistors• VBE matched less than ±1 mV• 5 general purpose monolithic transistors• wide operating current rangeApplications:• filters• custom designed differential amplifiers• temperature compensated amplifiers
€5.00*
Alfa Rpar - AS3052D - NPN Transistor Array

available

The AS3052 consists of 8 NPN transistors, 2 diodes and 1 buried zener on a common monolithic substrate. Transistor array allows variety of connections - differential pairs, different type of current sources, and different kind of multipliers/dividers. They may be used as discrete transistors in conventional circuits, however in addition, they provide the very significant inherent integrated circuit advantages of close electrical and thermal matching.Features:• 8 matched npn transistors, 2 diodes, 1 burried zener diode• VBE matched less than ±1 mV• wide operating current rangeApplications:• filters (Moog type)• multipliers (like MC1496)• dividers• Gilbert cells• custom designed differential amplifiers• temperature compensated amplifiers
€0.00*
Alfa Rpar - AS3080ED - Single OTA

available

The AS3080E is a gain block which is the operational-transconductance-amplifier (OTA).The AS3080E have differential input and a single-ended, push-pull, class A output. Amplifier bias input may be used either for gating or for linear gain control. High output impedance and transconductance (g_M) is directly proportional to the amplifier bias current (I_ABC). Linearizing diodes are provided at the inputs to reduce distortion and allow higher input levels. The result is a 10-dB signal-to-noise improvement referenced to 0,5 percent THD.The AS3080E is notable for it’s high slew rate (50V/μs), which makes it especially useful for multiplexer and fast unity-gain voltage followers. It is especially applicable for multiplexer applications because power is consumed only when the devices are in the “ON” channel state.Features:• maximum offset < 800 μV• slew rate (unity gain, compensated) 50V/μs• adjustable power consumption 10μW to 30μW• flexible supply voltage range ±2V to ±15V• fully adjustable gain 0 to g_M R_L Limit• tight g_M spread 1,6:1• extended g_M linearity 4 Decades• linearizing diodesApplications:• Sample and Hold• Multiplexer• Voltage Follower• Multiplier• Comparator
€6.50*
Alfa Rpar - AS3109 - Voltage Controlled Filter (VCF)

available

AS3109 is a high performance voltage controlled four-pole filter. 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 15 octave range with little control voltage feedthrough. AS3109 benefits from high input impedance buffers.Features:• voltage controllable range – till 15 octave• accurate exponential frequency scale• high input impedance buffers• wide transconductance range• low input offset voltage• low control voltage feedthrough - 45 dB typicalApplications:• for electronic music
€9.00*
Alfa Rpar - AS3280D - Dual OTA

available

The AS3280 and AS3280A types consist of two variable operational amplifiers that are designed to substantially reduce the initial input offset voltage and the offset voltage variation with respect to changes in programming current. This design results in reduced "AGC thump," an objectionable characteristic of many AGC systems. Careful design of critical places of the circuit reduces the amplifier dependence upon thermal and processing variables.The AS3280 has all the generic characteristics of an operational voltage amplifier except that the forward transfer characteristics is best described by transconductance rather than voltage gain, and the output is current, not voltage. The magnitude of the output current is equal to the product of transconductance and the input voltage. This type of operational transconductance amplifier has since gained wide acceptance as a gateable, gain controlled building block for instrumentation and audio applications, such as linearization of transducer outputs, standardization of widely changing signals for data processing, multiplexing, instrumentation amplifiers operating from the nanopower range to high current and high speed comparators.Features:• Low Initial Input Offset Voltage: 500 μV (Max) (AS3280A)• Low Offset Voltage Change vs I_ABC: <500 μV (Typ)• Low Offset Voltage Drift: 5μV/°C (Max) (AS3280A)• Excellent Matching of the Two Amplifiers for All Characteristics• Internal Current-Driven Linearizing Diodes Reduce the External Input Current to an Offset Component• Flexible Supply Voltage Range ±2V to ±15VApplications:• Voltage Controlled Amplifiers Oscillators• Multipliers• Demodulators• Sample and Hold• Instrumentation Amplifiers• Function Generators• Triangle Wave-to-Sine Wave Converters• Comparators• Audio Preamplifier
€9.00*
Alfa Rpar - AS3280A - Dual OTA

available

The AS3280 and AS3280A types consist of two variable operational amplifiers that are designed to substantially reduce the initial input offset voltage and the offset voltage variation with respect to changes in programming current. This design results in reduced "AGC thump," an objectionable characteristic of many AGC systems. Careful design of critical places of the circuit reduces the amplifier dependence upon thermal and processing variables.The AS3280 has all the generic characteristics of an operational voltage amplifier except that the forward transfer characteristics is best described by transconductance rather than voltage gain, and the output is current, not voltage. The magnitude of the output current is equal to the product of transconductance and the input voltage. This type of operational transconductance amplifier has since gained wide acceptance as a gateable, gain controlled building block for instrumentation and audio applications, such as linearization of transducer outputs, standardization of widely changing signals for data processing, multiplexing, instrumentation amplifiers operating from the nanopower range to high current and high speed comparators.Features:• Low Initial Input Offset Voltage: 500 μV (Max) (AS3280A)• Low Offset Voltage Change vs I_ABC: <500 μV (Typ)• Low Offset Voltage Drift: 5μV/°C (Max) (AS3280A)• Excellent Matching of the Two Amplifiers for All Characteristics• Internal Current-Driven Linearizing Diodes Reduce the External Input Current to an Offset Component• Flexible Supply Voltage Range ±2V to ±15VApplications:• Voltage Controlled Amplifiers Oscillators• Multipliers• Demodulators• Sample and Hold• Instrumentation Amplifiers• Function Generators• Triangle Wave-to-Sine Wave Converters• Comparators• Audio Preamplifier
€9.00*
Alfa Rpar - AS3310D - ADSR Voltage Controlled Envelope Generator

available

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. On the negative power output, there is an internal Zener diode at 7.4 volts ± 10%, which allows the chip to supply a maximum voltage of ± 15 volts with a current-limiting resistor REE, and a minimum positive supply voltage of + 11 volts and a minimum negative supply voltage of -5 volts.. A series current limiting resistor must be added between pin 6 and the supply. Its value is calculated as follows: R_EE = (V_EE - 7.5) / 0,010.Features:• Large Time Control Range: 100,000:1• Full ADSR Response• True RC Envelope Shape• Exceptionally Low Control Voltage Feedthrough: 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 +15VApplications:• for electronic music
€5.50*
Alfa Rpar - AS3320F - Voltage Controlled Filter

available

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 feedthrough. 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 800kHzApplications:• for electronic music
€6.00*
Alfa Rpar - AS3330 - Dual Voltage Controlled Amplifier

available

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.The devices include an on-chip 7.4 volt Zener, allowing them to operate off ±15 volt supplies as well as +15, -5 volt supplies.Improved protection and crosstalk level (better than -80 dB).Power pad in QFN package highly improves thermal stability of parameters of AS3330F.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 suppliesApplications:• for electronic music
€6.00*
Alfa Rpar - AS3340HYB - Voltage Controlled Oscillator (VCO)

available

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.Also included is provision for hard and soft synchronization of the frequency, and an output for easy adjustment of highfrequency tracking. Special care in the design ensures oscillation start-up under any power-on sequence and supplyConditions.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 SuppliesApplications:• for electronic music
€17.00*
Alfa Rpar - AS3340AD - Voltage Controlled Oscillator (VCO)

sold out at the moment

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.Also included is provision for hard and soft synchronization of the frequency, and an output for easy adjustment of highfrequency tracking. Special care in the design ensures oscillation start-up under any power-on sequence and supplyConditions.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 SuppliesApplications:• for electronic music
€0.00*
Alfa Rpar - AS3341D - linear in dB temperature compensated voltage controlled current source (VCCS)

available

AS3341 is a voltage controlled current source with internal temperature compensation and a matched pair of NPN transistors. Current source uses a temperature-compensated core of the VCO AS3340, with an exponential and linear control scale.The output current Iout- can be varied within a wide range from 50 nA to 500 μA. AS3341 also has a current output Iout + = 1 / 4Iout- which can be used to compensate for the linearity of the control characteristic for a large output current Iout- .Features:• controlled range – till 14 octave• fully temperature compensated• summing node inputs for current control• matched differential NPN pair• high exponential scale accuracyApplications:• stabilized current sources• MOOG-type filters• for electronic music
€7.00*