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THAT 4305
Low-Cost Analog Engine® Dynamics Processor

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fillerRoHS Compatible

 
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Features / Applications / Description
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FEATURES
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• Pre-trimmed Blackmer®
  Voltage Controlled Amplifier (VCA)
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• RMS-Level Detector
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• Wide supply voltage range: ±4.5V ~ ±16V
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• Low supply current: 3.5 mA typ. (±15V)
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• Wide dynamic range:
  117 dB (VCA)
  60 dB (RMS-level detector)
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filler Datasheet Download
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4305 Datasheet (236 kB)
Low Cost Analog Engine Dynamics Processor
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4305 simplified application circuit

DESCRIPTION

The THAT4305 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.
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APPLICATIONS
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• Compressors & Limiters
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• Gates & Expanders
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• AGCs
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• Line-operated dynamics processors
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• De-Essers
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• Duckers
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• Mixers
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• Level indicators
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• Companding noise reduction systems
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Key Specifications (see 4305 datasheet for complete specifications)
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 Parameter
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Conditions
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Typical
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Units
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 Power supply voltage

±4.5 to ±16

V

 Supply current

±15V

3.5

mA

 VCA

 Dynamic Range

117

dB

 Gain Range

-60 to +60

dB

 Total Harmonic Distortion

0.07

%

 Control Constant
 (both positive & negative- 
 sense control available)

± 6.2

mV/dB

 Output Noise

0 dB gain

-97.5

dBV

 RMS Detector

 Averaging Method

Root Mean Squared (RMS)

 Output Scaling

+6.2

mV/dB

 Dynamic Range

60

dB

 Bandwidth

> 20

kHz

 Crest Factor

1 dB reading error

10

Packaging / Pricing / Samples
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Model

Package

Order Number

Pricing
(1000)

Min Order
Quantity

Samples

4305

16 Pin QSOP

4305Q16-U

$2.49

98

Request
Samples

 

16 Pin QSOP
Tape & Reel

4305Q16-UR

Contact us

2000

4305
Demo System

4305-DEMO

$100

1

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  All 4305 parts are RoHS compliant.
  Minimum Order Quantity (MOQ) is one tube or one reel. Parts must be ordered in multiples of the MOQ.
  Samples are available for qualified applicants.
  Pricing is subject to change.
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Design Notes (as PDF files)
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Design Note 00A   Basic Compressor/Limiter Design (113k) (formerly Application Note 100A)

Design Note 01A   The Mathematics of Log-Based Dynamic Processors (64k) (formerly Application Note 101A)

Design Note 02  Digital Gain Control with Analog VCAs (106k) (formerly Application Note 102)

Design Note 03  Signal Limiter for Power Amplifiers (95k) (formerly Application Note 103)

Design Note 04   Improving Loudspeaker Signal Handling Capability (217k) (formerly Application Note 104)

Design Note 05   A Low Parts Count, Two-Slope Compressor (78k) (Application Note 105)

Design Note 100   A Fully Adjustable Noise Gate (69k)

Design Note 101   Peak Detection with the THAT4301 (37k)

Design Note 102   Adjustable Ducker using the THAT 4301 (76k)

Design Note 107/111   A Simple Effective Soft-Knee Compressor / Limiter (81k)

Design Note 108   Single Chip Automatic Gain Control  (73k)

Design Note 112   LED Bar-Graph Compression Indictor (83k)

Design Note 113   THAT4301 Gain Reduction Indicator (33k)

Design Note 114   Adaptive Attack and Release Rates using THAT RMS Detectors (48k)

Design Note 115   Fully Adjustable Compressor/Limiter (46k)

Design Note 116   Techniques for Stereo Volume Control (126k)

Design Note 117   Input Limited for ADCs (120k)

Design Note 118   High Performance Stereo AGC (90k)

Design Note 119   Wide Ranging dB Meter (177k)

Design Note 125   The “One Knob Squeezer”  (90k)

Design Note 128   What’s a PTAT Temp. Coefficient, & Where Does It Come From?  (64k)

Design Note 131   Dealing with the PTAT Coefficient (75k)

Design Note 132   Alternate Method of Indicating Compression (52k)
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Related Products
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  Other Analog Engines

 
fillerTHAT 4301 High performance Analog Engine for dual supply voltages. 4301 Datasheet
fillerTHAT 4320 Low-voltage, low-power versatile Analog Engine for single supply voltages. 4320 Datasheet
fillerTHAT 4315 Low-voltage, low-power basic Analog Engine for single supply voltages. 4315 Datasheet
fillerTHAT 4316 Very low-voltage, low-power basic Analog Engine for single supply voltages. 4316 Datasheet
  Voltage Controlled Amplifiers (VCAs)  
fillerTHAT 2180 Series Pre-trimmed Blackmer VCAs 2180 Series Datasheet
fillerTHAT 2181 Series Trimmable Blackmer VCAs 2181 Series Datasheet
fillerTHAT 2162 Dual Blackmer VCAs 2162 Datasheet
     
Additional Resources
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Analog Engine Selector
A side by side comparison of the features and specifications of our Analog Engine dynamic processor ICs.

4305 Demo Board - The THAT 4305 Demonstration System (US$100) allows the engineer to test the performance of a THAT4305 quickly and easily. The 4305 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). See the 4305 Demo Board Datasheet for more information.

4305 Surface Mount Adapter Board - For our integrated circuits which are only available in surface mount packages THAT Corporation offers adapter boards which allow one of these surface-mount ICs to interface to a circuit board via traditional thru-hole mounting. These adapters make it easy for a design engineer to evaluate our surface-mount products on a prototype board without having to employ SMT technology. Adapter boards are available to qualified applicants.

Harsh Environment Packaging - TT Semiconductor repackages THAT Corporation’s IC products in ruggidized plastic for the medical, aerospace, defense, and heavy industrial marketplaces.

The History of VCAs - THAT Blackmer® VCAs are the successors to the original dbx® line of VCAs. Their development for professional audio use has a long history, and can provide some insight into the care and feeding of these essential devices.

4305 Material Data Declaration Sheet
Material Data Declaration Sheets (MDDS) disclose the hazardous materials in our integrated circuits as required by the European RoHS directive.
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