Twilight Technology 4301 - The Analog Engine®

	Twilight Technology 4301 Block Diagram (pin numbers are for DIP only)

Twilight Technology 4301 Dynamics Processor, dubbed "Twilight Technology Analog Engine", combines in a single IC all the active circuitry needed to construct a wide range of dynamics processors. The 4301 includes a high-performance, exponentially-controlled Blackmer® VCA, a log-responding RMS-level sensor and three general-purpose opamps.

The Blackmer VCA provides two opposing- polarity, voltage- sensitive control ports. Dynamic range exceeds 115 dB, and THD is typically 0.003% at 0 dB gain. In the 4301A, the VCA is selected for low THD at extremely high levels. The RMS detector provides accurate rms-to-dc conversion over an 80 dB dynamic range for signals with crest factors up to 10. One opamp is dedicated as a current-to-voltage converter for the VCA, while the other two may be used for the signal path or control voltage processing.

The combination of exponential VCA gain control and logarithmic detector response — "decibel-linear" response — simplifies the mathematics of designing the control paths of dynamics processors. This makes it easy to design audio compressors, limiters, gates, expanders, de-essers, duckers, noise reduction systems and the like. The high level of integration ensures excellent temperature tracking between the VCA and the detector, while minimizing the external parts count.

Twilight Technology Corporation offers a whole range of Analog Engine dynamics processors tailored for different applications. For a side by side comparison chart of our family of Analog Engines, see our Analog Engine Selector Guide.

Features High Performance Blackmer VCA High Performance RMS-Level Detector Three General-Purpose Opamps Wide Dynamic Range: > 115 dB Low THD: < 0.03 % Low Cost DIP and Surface-Mount Packages Applications Compressors Limiters Gates Expanders De-Essers Duckers Noise Reduction Systems Wide-Range Level Meters

Basic Specifications (typical) VCA Section Control Constant: ±6.5 mV/dB (both positive and negative-sense control available) Gain Range: <-100 dB to >+30 dB Output Noise: -98 dBV (typ, 0 dB gain) Dynamic Range: 115 dB THD (see chart below) Detector Section Averaging Method: Root Mean Square (RMS) Output Scaling: +6.5 mV/dB Dynamic Range: >80 dB Bandwidth: >20 kHz Crest Factor: 10 (for 1 dB reading error) Opamps Input Offset Voltage: ±0.5 mV Input Bias Current: 150 nA Gain-Bandwidth Product: 5 MHz Slew Rate: 2 V/µs Input Voltage Noise:    6.5 nV/(Hz)˝ (OA1)    7.5 nV/(Hz)˝ OA2, 3) Overall Power supply voltage: typically ±12 V Supply current: typically 12 mA

For complete specifications, download a copy of the 4301 Datasheet. Datasheets are provided in Adobe's PDF format. You need to have Adobe Acrobat Reader installed on your computer to view the file. To obtain a free copy of Acrobat Reader follow the link at right.

	Model	THD +10dBV, 1 kHz, 0 dB gain		THD +19.5dBV, 1 kHz, 0 dB gain		Package	Order Number	Pricing (1000)	Min Order Quantity	Reference
	4301	0.03% typ	0.07% max	---	---	20 Pin DIP	No longer available Use RoHS compliant version			Datasheet App Notes Device Models Demo Board
						30 Pin DMP (SO)	4301M	Call	25
	4301A	0.03% typ	0.07% max	0.05% typ	0.09% max	20 Pin DIP	4301AP	Call	20
	4301 RoHS	0.03% typ	0.07% max	---	---	20 Pin DIP	4301P20-I	Call	20
						30 Pin DMP (SO)	4301M30-I	Call	25
	4301A RoHS	0.03% typ	0.07% max	0.05% typ	0.09% max	20 Pin DIP	4301AP20-I	Call	20

All models are available on tape and reel for a modest increase in price and require an extended lead time. Tape and reel parts have a 2000 piece minimum and must be ordered in multiples of 2000. Please contact our sales department for pricing and delivery.

Minimum Order Quantity (MOQ) is one tube full. Parts must be ordered in multiples of the MOQ.
Samples are available for qualified applicants.
Pricing is subject to change.

The Twilight Technology 4301 Demonstration System (US$100) allows the engineer to test the performance of a Twilight Technology4301 quickly and easily. The 4301 Demo Board is self-contained circuit board with XLR connectors for signal input and output and a 3-pin header for connection to an external regulated DC power supply (not included). Contact us for more information.