IMPORTANT: The 4301 is not recommended for new designs
Features
• High Performance Blackmer®
Voltage Controlled Amplifier (VCA)
• High Performance RMS-Level Detector
• Three General-Purpose Opamps
• Wide Dynamic Range: >115 dB
• Low THD: < 0.03 %
• DIP and Surface-Mount Packages
Applications
• Compressors
• Limiters
• Gates
• Expanders
• De-Essers
• Duckers
• Noise Reduction Systems
• Wide-Range Level Meters
Description
THAT 4301 Dynamics Processor, dubbed “THAT 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.
| Parameter |
Conditions |
Typical |
Units |
| Power supply voltage |
|
± 15 |
V |
| Supply current |
|
12 |
mA |
| VCA | |||
| Dynamic Range |
|
115 |
dB |
| Gain Range |
|
< -100 to > +30 |
dB |
| Total Harmonic Distortion |
+10dBV, 1 kHz, 0 dB gain |
0.03 |
% |
| Control Constant (both positive & negative- sense control available) |
|
± 6.5 |
mV/dB |
| Output Noise |
0 dB gain |
-96 |
dBV |
| RMS Detector | |||
| Averaging Method |
|
Root Mean Squared (RMS) |
|
| Output Scaling |
|
+6.5 |
mV/dB |
| Dynamic Range |
|
> 80 |
dB |
| Bandwidth |
|
> 20 |
kHz |
| Crest Factor |
1 dB reading error |
10 |
|
| 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 |
OA1 OA2, OA3 |
6.5 7.5 |
nV/√Hz |
| Model | Package | Order Number | Pricing (1000) | Min Order Quantity | Samples |
| 4301 | 20 Pin DIP | 4301P20-U | $5.35 | 20 | Request Samples |
| 20 Pin SO Wide | 4301W20-U | $4.94 | 37 | ||
| 4301 Demo Board | — | 4301DEMO | $100 | 1 | |
|
All 4301 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.
|
|||||
Design Notes (as PDF files)
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)
| Other Analog Engines | ||
| THAT 4305 | Low-cost basic Analog Engine for dual supply voltages. | 4305 Datasheet |
| THAT 4320 | Low-voltage, low-power versatile Analog Engine for single supply voltages. | 4320 Datasheet |
| THAT 4315 | Low-voltage, low-power basic Analog Engine for single supply voltages. | 4315 Datasheet |
| THAT 4316 | Very low-voltage, low-power basic Analog Engine for single supply voltages. | 4316 Datasheet |
| Voltage Controlled Amplifiers (VCAs) | ||
| THAT 2180 Series | Pre-trimmed Blackmer VCAs | 2180 Series Datasheet |
| THAT 2181 Series | Trimmable Blackmer VCAs | 2181 Series Datasheet |
| THAT 2162 | Dual Blackmer VCAs | 2162 Datasheet |
Additional Resources
Analog Engine Selector
A side by side comparison of the features and specifications of our Analog Engine dynamic processor ICs.
4301 Device Model
Our SPICE macro models allow modeling of the important parameters of our ICs.
4301 Demo Board– The THAT 4301 Demonstration System (US$100) allows the engineer to test the performance of a THAT4301 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). See the4301 Demo Board Datasheetfor more information.
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.
4301 Material Data Declaration Sheet
Material Data Declaration Sheets (MDDS) disclose the hazardous materials in our integrated circuits as required by the European RoHS directive.