TT Semiconductor 4305 Low-Cost Analog Engine®

	TT Semiconductor TTAE4305 Equivalent Block Diagram

The TT Semiconductor TTAE4305 is a single-chip Analog Engine optimized for low-cost applications. It incorporates a high-performance Blackmer® voltage-controlled amplifier (VCA) and log-responding RMS-level sensor. The VCA and RMS detector are pre-trimmed at wafer stage to deliver low distortion without further adjustment.

Available in several standard ceramic and extended temperature plastic packages, the 4305 is aimed at common signal processing applications such as compressor/limiters, gates, and other dynamic processors. The part normally operates from a split supply voltage up to ±16 Vdc, drawing only 3.5 mA at ±15 V. This IC also works at supply voltages as low as ±4.5 V, making it useful in some battery-operated products as well.

The TTAE4305 was developed specifically for use in low-cost dynamics processors, drawing from the Audio Industry's long history and experience with such designs. Both VCA control ports and the detector input and output are available for the designer to connect as s/he sees fit. As a result, the part is extremely flexible and can be configured for a wide range of applications including single- and multi-band companders, digital overload protectors, voltage-controlled faders, level indicators, etc.

What really sets the TTAE4305 apart from other manufacturers' offerings is the ultra low noise output of its Blackmer VCA, coupled with its accurate true-RMS level detector. This makes the IC useful in a wide range of analog signal processing and audio products.

For a side by side comparison chart of our family of Analog Engines, see our Analog Engine Selector Guide.

Features Pre-trimmed Blackmer® VCA and   RMS-level detector Wide supply voltage range: ±4.5V ~±16V Low supply current: 3.5 mA typ. (±15V) Wide dynamic range:   117 dB (VCA)   60 dB (RMS-level detector) Applications Compressors & Limiters Gates & Expanders AGCs Line-operated dynamics processors De-Essers Duckers Mixers Level indicators Companding noise reduction systems

Basic Specifications (typical) VCA Section Gain Range: -60 to +60 dB Gain-Control Constant: ± 6.2 mV/dB Output Noise: -97.5 dBV (typ, 0 dB gain) Total Harmonic Distortion: 0.07 % Dynamic Range: 117 dB Detector Section Averaging Method: Root Mean Square (RMS) Output Scaling: +6.2 mV/dB Dynamic Range: 60 dB Bandwidth: > 20 kHz Crest Factor: 10 (for 1 dB reading error) Overall Power supply voltage: ±4.5 to ±16 V Supply current: typically 3.5 mA (±15V)

For complete specifications, download a copy of the 4305 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	Package	Order Number	Pricing (1000)	Min Order Quantity	Reference
	4305	16 pin Ceramic DIP	TTAE4305D	Call	50	Datasheet
		16 pin Ceramic Flatpack	TTAE4305F	Call	98
		20 pin Ceramic LCC	TTAE4305L	Call	98
		16 pin Extended Temp. Plastic DIP	TTAE4305P	Call	50
		16 pin Extended Temp. Plastic  SOIC	TTAE4305S	Call	98

The 4305 is available on tape and reel for a modest increase in price and requires 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.