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THAT 2252
RMS-Level Detector ICs

fillerSTATUS
fillerOBSOLETE
fillerRoHS Compatible

 

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IMPORTANT: The 2252 is OBSOLETE.
We offer RMS-level detectors whose performance is nearly identical to the 2252 as part of our popular Analog Engine® series. For low-voltage applications, please consider the 4315 or 4320. For high-voltage applications, we recommend the 4305. Please contact our sales department for more information.

The information below is offered for reference purposes only.
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Features / Applications / Description
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FEATURES
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• True RMS response
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• Wide dynamic range
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• High crest factor
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• Wide bandwidth
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• Logarithmic output scaling
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• Low cost
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• Single in-line package
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Matches THAT 2180 and 2181 Series VCAs
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filler Datasheet Download
2252 Datasheet (227 kB) RMS Level Detector
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2252 typical application circuit

DESCRIPTION

The THAT 2252 integrated-circuit rms level detector is designed to convert an AC input current into a DC output voltage. The output is proportional to the log of the true rms value of the input signal.

Fabricated in a super low-noise process, the 2252 combines wide dynamic range with frequency response to beyond 20 kHz. The logarithmic output is especially convenient for audio applications requiring decibel-linear scaling. The integration time is adjustable via an external R/C pair. With some external circuitry, response to DC is also possible.
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APPLICATIONS
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• Meters
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• Spectrum Analyzers
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• Compressors
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• Expanders
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• Oscillators
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• Psychoacoustic Modeling
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• Noise Measurement
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Key Specifications (see 2252 datasheet for complete specifications)
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fillerParameter
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Conditions
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Typical
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Units
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fillerDynamic Range
> 80
dB
fillerCrest Factor
1 dB error
8
fillerBandwidth
20
kHz
fillerOutput Scale Factor
6.1
mV/dB
fillerSupply Voltage Range
± 4 ~ ± 15
V
fillerSupply Current
No signal
1
mA
Packaging / Pricing / Samples
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Model Package Order Number Pricing
(1000)
Min Order
Quantity
Reference
2252 No longer available

 

2252
Demo Board
No longer available
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   All 2252 parts are RoHS compliant.
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Design Notes (as PDF files)
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Design Note 00A   Basic Compressor/Limiter Design (113k)

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

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

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

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

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

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

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

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

Design Note 113   THAT4301 Gain Reduction Indicator

Design Note 114   Adaptive Attack and Release Rates using THAT RMS Detectors

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)

Analog Secrets Your Mother Never Told You (1528k)
Originally presented at the 123rd AES Convention, this seminar provides tips and techniques to achieve optimal performance in the analog signal path. Topics covered range from inputs (balanced line and mic level) to outputs (balanced to single-ended), and include analog signal processing (VCAs, RMS detection, and Analog Engines).
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Related Products
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  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 Pre-trimmed Blackmer VCA 2162 Datasheet
  Analog Engine® Dynamics Processors  
fillerTHAT 4301 High Performance Analog Engine for dual supply voltages 4301 Datasheet
fillerTHAT 4305 Low-cost basic Analog Engine for dual supply voltages 4305 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
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Additional Resources
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2252 Device Model
Our SPICE macro models allow modeling of the important parameters of our ICs.

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

2252 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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