Integrated Circuit - AS3372E, Synth Voice, Alfa, 24 Pin DIP

Integrated Circuit - AS3372E, Synth Voice, Alfa, 24 Pin DIP

Alfa
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The AS3372E is Alfa’s take on the CEM3372 µP Controllable Signal Processor in a DIP-24 package. The AS3372E features an additional two VCA’s so an adapter board is required when using as a replacement for the CEM version. The CEM version was used in multiple classic synths, including the Oberheim Matrix 12, Oberheim Xpander, Sequential Prophet T8, Sequential Prophet 600, Akai AX80, Rhodes Chroma Polaris, and more.

The AS3372E is a general purpose signal processing device for audio tone sources. Included on-chip is a two channel voltage controlled input mixer, a dedicated 4-pole low pass voltage controlled filter with voltage controllable resonance, universal mixing/panning VCA-block and a quality final voltage controlled amplifier. With the exception of the filter cut-off frequency, (the filter frequency control voltage ranges from - 150mV to +100mV) all control inputs are very low bias current, high impedance inputs which range from 0 to + 5 volts. This feature allows the common DAC output voltage in a microprocessor system to be multiplexed to these inputs with only a CMOS analog multiplexer and hold capacitors, thus eliminating the usual Sample & Hold buffers.

The two input VCAs of the mixer feature audio taper control scales and high attenuation at zero control voltage. The signal inputs are low level (±40mV for 5% THD), allowing multiple tone sources to be conveniently mixed into each channel. Additional filter input allows design flexibility.

A unique feature of the 24dB/octave filter is that, unlike others of this type, the passband gain remains constant as the amount of resonance is varied, thus eliminating the annoying drop in volume at higher resonance settings. Other features include wide frequency control range, temperature compensated transconductors, low noise, low control feed-through, and a smooth behaviour when swept. The final output VCA is a current in, current out type, allowing multiple inputs to be easily mixed into its input, and easy interface of its output to the rest of the system. The control scale is very linear, and the point at which the VCA shuts off is very well defined (+100mV ± 50mV). Owing to its exceptionally low noise and exceptionally low control feedthrough without trimming, this VCA is well suited to being controlled by fast transient waveforms.

Features

  • 2-channel VC input mixer with external input
  • 4-pole low pass VCF & Quality Final VCA
  • universal mixing/panning VCA-block
  • 0 to +5V high Z control Inputs for direct interface to system DAC from CMOS multiplexer
  • VCF uses open loop design for enhanced sound richness
  • VCF has constant loudness as resonance changed
  • TC compensated VCF
  • Final VCA has low feed-through without trimming
SKU:
P-Q-AS3372E
Item ID:
045685
UPC/EAN:
841358108082
ALFA RPAR Part Number:
AS3372E
Brand:
Alfa
Package:
Product Measurements by Type
Max. Attenuation at Vmix =0 (VCA1, VCA2)120 dB
Max. Control Input Bias Current (VCA4)±3 nA/V
Max. Control Voltage (Cntrl 5/6) (VCA5/VCA6)2 V
Max. Control Voltage for Maximum Attenuation (VCA4)140 mV
Max. Control Voltage for Maximum Gain (VCA4)5.5 V
Max. DC Control Feedthrough (with adjustment) (VCA5/VCA6)1 µA
Max. DC Control Feedthrough (without adjustment) (VCA5/VCA6)-6 µA
Max. DC Control Feedthrough pin 5 (with adjustment) (VCA1, VCA2)1 mV
Max. DC Control Feedthrough pin 5 (without adjustment) (VCA1, VCA2)10 mV
Max. DC Output Offset at Maximum Attenuation1 nA
Max. DC Output Shift Over 10 Octave Range (VCF)250 mV.P.P.
Max. DC Output Shift from Maximum Attenuation to Maximum Gain (VCA4)±0.5 μA
Max. Exponential Scale Error, Midrange (VCF)1%
Max. Frequency Control Input Bias (VCF)-3.5 μA
Max. Frequency Control Scale (VCF)20.5 mV/octave
Max. Gain Range for 0 - 5V Control (VCA1, VCA2)0-6
Max. Gain Variation (unit to unit) (VCA1, VCA2)±2 dB
Max. Initial Frequency at VFREQ=0 (VCF)1650 Hz
Max. Input Mixer Output maximum voltage(FiltrIn) (VCA1, VCA2)400 mV
Max. Maximum Output Swing (VCF)11 V.P.P.
Max. Maximum Output Voltage Compliance (VCA4)VCC-1 V
Max. Maximum Possible Signal Input Swing (VCA4)±0.8 mA
Max. Maximum Recommended Signal Input Swing (VCA4)±200 μA
Max. Maximum Signal Current Gain (VCA4)1.1
Max. Maximum allowed output voltage range (VCA5/VCA6)400 mV
Max. Maximum output current (VCA5/VCA6)±180 μA
Max. Mix Control Input Bias Current (VCA1, VCA2)-0.5 nA/V
Max. Negative Supply Range (Maximum Supply Across Chip is 25V)-15.5 V
Max. Nominal Output Swing for 5% THD (No Resonance) (VCF)2.8 V.P.P
Max. Nominal Output Swing with Resonance (VCF)5.6 V.P.P
Max. Output Noise (VCA4)1 nA.R.M.S.
Max. Output Noise, Filter Wide Open (VCF)200 μV.R.M.S.
Max. Output Sink Current (VCF)-1 mA
Max. Output Source Drive Current (VCF)3 mA
Max. Positive Supply Range18 V
Max. Quiescent DC Output Voltage (VCF)3 V
Max. Resonance Control Input Bias Current (VCF)-0.5 nA/V
Max. Resonance Control Range (VCF)oscillation
Max. Resonance Control Voltage Required for Oscillation (VCF)3.4 V
Max. Resonance Input Signal Gain for 0 - 5V Control (VCF)0-220
Max. Signal Input Bias Current (Vmix = + 5V) (VCA1, VCA2)-1 μA
Max. Supply Current11 mA
Max. THD at ±200 μA Input (VCA4)3%
Max. Voltage at Signal Input Summing Node (VCA4)-0.85 V
Min. Attenuation at Vmix =0 (VCA1, VCA2)80 dB
Min. Control Input Bias Current (VCA4)±0.1 nA/V
Min. Control Voltage (Cntrl 5/6) (VCA5/VCA6)-2 V
Min. Control Voltage for Maximum Attenuation (VCA4)30 mV
Min. Control Voltage for Maximum Gain (VCA4)4.5 V
Min. Frequency Control Input Bias (VCF)-0.3 μA
Min. Frequency Control Range (VCF)14 octaves
Min. Frequency Control Scale (VCF)17.5 mV/octave
Min. Gain Control Range (VCA4)100 dB
Min. Gain Range for 0 - 5V Control (VCA1, VCA2)0-4.5
Min. Initial Frequency at VFREQ=0 (VCF)650 Hz
Min. Input Mixer Output maximum voltage(FiltrIn) (VCA1, VCA2)-300 mV
Min. Maximum Attenuation (VCA4)90 dB
Min. Maximum Output Swing (VCF)9 V.P.P.
Min. Maximum Output Voltage Compliance (VCA4)-0.2 V
Min. Maximum Possible Signal Input Swing (VCA4)±0.5 mA
Min. Maximum Signal Current Gain (VCA4)0.8
Min. Maximum allowed output voltage range (VCA5/VCA6)-300 mV
Min. Maximum output current (VCA5/VCA6)±120 μA
Min. Mix Control Input Bias Current (VCA1, VCA2)-0.02 nA/V
Min. Negative Supply Range (Maximum Supply Across Chip is 25V)-4.5 V
Min. Nominal Output Swing for 5% THD (No Resonance) (VCF)2.2 V.P.P
Min. Nominal Output Swing with Resonance (VCF)4.4 V.P.P
Min. Output Sink Current (VCF)-0.4 mA
Min. Positive Supply Range9.5 V
Min. Quiescent DC Output Voltage (VCF)2 V
Min. Resonance Control Input Bias Current (VCF)-0.02 nA/V
Min. Resonance Control Range (VCF)Q=0dB
Min. Resonance Control Voltage Required for Oscillation (VCF)2.2 V
Min. Resonance Input Signal Gain for 0 - 5V Control (VCF)0-165
Min. Signal Input Bias Current (Vmix = + 5V) (VCA1, VCA2)-0.1 μA
Min. Supply Current6.5 mA
Min. Voltage at Signal Input Summing Node (VCA4)-1.15 V
Resonance Signal Input Bias (VRES = +5V) (VCF)-3 μA
Typ. Attenuation at Vmix =0 (VCA1, VCA2)100 dB
Typ. Control Input Bias Current (VCA4)±0.5 nA/V
Typ. Control Voltage for Maximum Attenuation (VCA4)85 mV
Typ. Control Voltage for Maximum Gain (VCA4)5 V
Typ. DC Control Feedthrough (with adjustment) (VCA5/VCA6)0.1 µA
Typ. DC Control Feedthrough (without adjustment) (VCA5/VCA6)-4 µA
Typ. DC Control Feedthrough pin 5 (with adjustment) (VCA1, VCA2)0.1 mV
Typ. DC Control Feedthrough pin 5 (without adjustment) (VCA1, VCA2)7 mV
Typ. DC Output Shift Over 10 Octave Range (VCF)100 mV.P.P.
Typ. DC Output Shift from Maximum Attenuation to Maximum Gain (VCA4)±0.07 μA
Typ. Exponential Scale Error, Midrange (VCF)0.3%
Typ. Frequency Control Input Bias (VCF)-1.2 μA
Typ. Frequency Control Scale (VCF)19 mV/octave
Typ. Frequency Control Voltage for 14 Octave Range (VCF)-155 to +110 mV
Typ. Gain Control Range (VCA4)120 dB
Typ. Gain Range for 0 - 5V Control (VCA1, VCA2)0-5.2
Typ. Gain Variation (unit to unit) (VCA1, VCA2)0.7 dB
Typ. Initial Frequency at VFREQ=0 (VCF)1000 Hz
Typ. Maximum Attenuation (VCA4)120 dB
Typ. Maximum Input Signal for 5% THD (In5/In6) (VCA5/VCA6)±40 mV
Typ. Maximum Input Signal for 5% THD (VCA1, VCA2)±40 mV
Typ. Maximum Output Swing (VCF)10 V.P.P.
Typ. Maximum Signal Current Gain (VCA4)0.93
Typ. Maximum gain VCA5 (Vcntrl=+2V) (VCA5/VCA6)2 μA/mV
Typ. Maximum gain VCA6 (Vcntrl=-2V) (VCA5/VCA6)2 μA/mV
Typ. Maximum output current (VCA5/VCA6)±150 μA
Typ. Mix Control Input Bias Current (VCA1, VCA2)-0.1 nA/V
Typ. Nominal Output Swing for 5% THD (No Resonance) (VCF)2.5 V.P.P
Typ. Nominal Output Swing with Resonance (VCF)5 V.P.P
Typ. Output Sink Current (VCF)-0.7 mA
Typ. Quiescent DC Output Voltage (VCF)2.5 V
Typ. Resonance Control Input Bias Current (VCF)-0.1 nA/V
Typ. Resonance Control Voltage Required for Oscillation (VCF)2.8 V
Typ. Resonance Input Signal Gain for 0 - 5V Control (VCF)0-190
Typ. Signal Input Bias Current (Vmix = + 5V) (VCA1, VCA2)-0.3 μA
Typ. Supply Current8.5 mA
Typ. THD at ±200 μA Input (VCA4)1%
Typ. Voltage at Signal Input Summing Node (VCA4)-1 V
Packaging Information
Packaging Dimensions1.259 in. × 0.377 in. × 0.282 in.
Weight (Packaging)0.004 lbs.
PDF: DatasheetAll Models

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