that4320 THAT Corporation, that4320 Datasheet - Page 7

• Manufacturer Part Number: that4320
• Description: Pre-trimmed Low-voltage Low-power Analog Engine Dynamics Processor Ic
• Manufacturer: THAT Corporation

Document 600045 Rev 04
THAT Corporation’s proven Voltage-Controlled Am-
plifier (VCA) and RMS-Level Detector designs with
four general-purpose opamps to produce an Analog
Engine useful in a variety of dynamics processor ap-
plications. The part is integrated using a propri-
etary,
process. This process produces very high-quality bi-
polar transistors (both NPNs and PNPs) with unusu-
ally low collector-substrate capacitances. The 4320
The THAT 4320 Dynamics Processor combines
Figure 11. RMS Frequency Response vs. Level
fully
Figure 7. VCA Gain vs. Control Voltage
Figure 9. VCA Offset vs. Gain
complementary,
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com
dielectric-isolation
Copyright © 2007, THAT Corporation
Theory of Operation
takes advantage of these devices to deliver wide
bandwidth and excellent audio performance while
consuming very low current and operating over a
wide range of power supply voltages.
and RMS Detector building blocks, the interested
reader is referred to THAT Corporation’s data sheets
on the 2180-Series VCAs and the 2252 RMS Level
Detector. Theory of the interconnection of exponen-
For details of the theory of operation of the VCA
Figure 8. VCA Noise vs. Gain (BW=22KHz)
Figure 10. RMS Output vs. Level
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