RMS Noise to DC Converter – RMS Noise Measurement

  • Rajkumar Sharma
  • 35 Views
  • easy
  • Tested
  • SKU: EL148470
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This mini-module helps users to measure the RMS noise of AC signal. Apply the AC noise signal to the input and the circuit outputs a DC voltage. Signal bandwidth is 1Khz to 100Khz and input sensitivity is 1 μVolt RMS. The LT6203 ultra-low noise, low power op-amp amplifies the low-level signal. Further, this signal is converted into a DC voltage by LTC1966 True RMS converter chip from Analog Devices. The circuit works with dual supply +/-5V DC and consumes very low current.

VOutput = 1mVDC/1μVolt RMS Noise

Credits: Schematic is from Analog Devices Application note.

Features

  • Supply Dual 5V DC (+/-5V DC)
  • Input Sensitivity 1 Microvolt RMS Type
  • Screw Terminal Connector for Input Signal
  • Header Connector for Output and Power Input
  • On Board Power LED
  • PCB Dimensions 36.51 x 14.61mm

Schematic

Parts List

NO.QNTY.REF.DESC.MANUFACTURERSUPPLIER SUPPLIER PART NO
11CN12 PIN SCREW TERMINAL PITCH 5.08MMPHOENIXDIGIKEY277-1247-ND
21CN2DNP
31CN35 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5318-ND
45C1,C6,C7,C8,C10100nF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
51C2DNP
61C31uF/16V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
72C4,C910uF/16V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
81C51.5uF/16V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
91D1LED RED SMD SIZE 0805OSRAMDIGIKEY475-1278-1-ND
102L1,L2FERRITE BEAD 600OHM/100MHZ SMD SIZE 0805LAIRDDIGIKEY240-2390-1-ND
111R110K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
122R2,R5100E 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
131R30E SMD SIZE 0805YAGEO/MURATADIGIKEY
141R4100K 1% smd size 0805YAGEO/MURATADIGIKEY
151R61K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
161U1LTC6203 MSOP8ANALOG DEVICEDIGIKEYLT6203CS8#PBF-ND
171U2LTC1966 MSOP8ANALOG DEVICEDIGIKEY505-LTC1966CMS8#PBF-ND

Connections

Gerber View

Photos

Video


LTC1966 Datasheet

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