THAT2252

T H AT Corporation FEATURES · True RMS Response · Wide Dynamic Range: >80 dB · High Crest Factor: 8 (1 dB error) · Wide Bandwidth: to > 20 kHz · Logarithmic Output Scaling · Low Cost: $2.20 in ’000s · Single In-Line Package · Matches 2180 and 2181 Series VCAs IC RMS-Level Detector THAT 2252 APPLICATIONS · Meters · Spectrum Analyzers · Compressors · Expanders · Oscillators · Psychoacoustic Modeling · Noise Measurement 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. The parts are housed in a space-efficient plastic 8-pin single-in-line (SIP) package, and require minimal support circuitry. Based on dbx technology and fab- ricated 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. BIAS CURRENT COMP 1 1 3 4 2 BIAS CURRENT COMP 2 + V - 8 7 5 6 Pin Name Input I BIAS Gnd Sym VCap Output V+ SIP Pin 1 2 3 4 5 6 7 8 Figure 1. 2252 Equivalent Circuit Diagram Figure 2. 2252 Pin Assignments Doc. 600032 Rev. 03 dbx is a registered trademark of Carillon Electronics Corporation THAT Corporation; 45 Sumner Street; Milford, Massachusetts...