THAT 4320 Pre-trimmed Low-voltage Low-power Analog Engine^® 

	THAT 4320 equivalent block diagram

The THAT4320 is a single-chip Analog Engine optimized for low-voltage, low-power operation. Incorporating a high-performance Blackmer® voltage- controlled amplifier (VCA), RMS-level sensor, and four opamps, the surface mount part is aimed at battery-operated audio applications such as wireless microphones, wireless instruments and in-ear monitors. The 4320 operates from a single supply voltage down to +4.5 Vdc, drawing only 3.7 mA.

This IC also works at supply voltages up to 16 Vdc, making it useful in line-operated products as well. The VCA is pre-trimmed at wafer stage to deliver low distortion without further adjustment. And, one opamp is quiet enough to be used as a microphone preamp.

The part was developed specifically for use as a companding noise reduction system, drawing from THAT’s long history and experience with dbx® technology for noise reduction. However, with 22 active pins, the part is extremely flexible and can be configured for a wide range of applications including single and multi-band companders, compressors, limiters, AGCs, de-essers, etc.

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

Features Pre-trimmed Blackmer VCA and RMS detector Wide supply voltage range: 4.5V ~ 16V Low supply current: 3.7 mA (5V) Four opamps One low noise opamp (< 5 nV/ÖHz) On board PTAT reference Wide Dynamic Range: 120 dB as compander Applications Companding noise reduction systems    Wireless microphones    Wireless instrument packs    Wireless in-ear monitors Battery operated dynamics processors    Compressors    Limiters    AGCs    De-essers

Basic Specifications (typical) VCA Section Control Constant: 6.0 mV/dB Gain Range: -100 dB to +40 dB Output Noise: -98 dBV (typ, 0 dB gain) THD: 0.05% Detector Section Averaging Method: Root Mean Square (RMS) Output Scaling: 6.0 mV/dB Bandwidth: > 20 kHz Crest Factor: 10 (for 1 dB reading error) Opamps Input Offset Voltage: ±1 ~ ±1.5 mV Input Bias Current: 200 ~ 500 nA Gain-Bandwidth Product: 7.3 ~ 13 MHz Slew Rate: 3.2 ~ 4 V/µs Input Voltage Noise:    OA1: 4.5 nV/ÖHz    OA2: 8 nV/ÖHz    OA3 & 4: 10.5 nV/ÖHz Overall Power supply voltage: typically 5 V Supply current: typically 3.7 mA

For complete specifications, download a copy of the 4320 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
4320	28 Pin QSOP	4320Q28-U	$5.40	49	Datasheet App Notes Demo Boards RoHS Info

The 4320 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.

All 4320 parts are RoHS compliant.
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 THAT 4320 Demonstration System (US$150) allows the engineer to test the performance of a THAT4320 quickly and easily. The 4320 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.

For samples or further pricing information, please contact us directly by telephone: +1(508)634-9922, fax:+1(508)634-6698, or email: sales@thatcorp.com.