DATASHEET SEARCH SITE | WWW.ALLDATASHEET.COM

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 4

Technical content

The Mixed Signal Integration Tone Detector (MSDET) is a monolithic CMOS integrated circuit for pre-processing analog signals before microcon- troller operations. The MSDET contains an I and Q detector driven by a voltage controlled oscilla- tor. The center frequency of the tone detection is one-half of the VCO frequency. Center fre- quencies from 1 Hz to 100 kHz can be detect- ed, and FSK decoded. The MSDET is an analog PLL with the improved noise immunity inherent in such a design. By using the MSDET to demodulate and detect FSK or tones a slower, lower cost microcontroller can be used. The reduction in microcontroller clock rate also reduces the problems with RF emissions for FCC and CE approvals. The MSDET operates with a supply voltage from 2.7 VDC to 5.5 VDC The MSDET is superior to the industry standard 567 tone decoder in that more filtering can be added in the detection loop and output filter. The MSDET is available in a 16-pin SOIC (150 mil wide). Industrial temperature range (-40 to +85oC) is available. Feaaturres Low Power Consumption: Less than 2.0 mW at 2.7V Analog PLL for improved noise immunity Applicaations Satellite radio communications Standard and non-standard tone detection Standard and non-standard FSK demodulation Caller ID demodulation Bell 103, 202 or ITU V.21, V.23 demodulation Absolute Maaximum Raatings Power Supply Voltage +6 V Storage Temperature Range -60o to +150o C Operating Temperature Range -40o to +85o C M SDET Tone Dettecttor Datta Sheett Figure 1 Block Diagram ©2004-22014 Mixeed Signal Inteegratioon 1Weeb Sitee ““www.mix-ssig.coom”” L OUT IN QOUT LI L POUT R C VIND I VREF DOUT OSCILLA TO R GAIN

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC Specifications Operating Voltage VDD 2.7 5.5 V Supply Current IDD 0.2 0.6 2.0 mA Digital Outputs levels 0.5 VDD-0.5 VDC Internal Voltage Reference VREF 1.21 VDD .0.5 VDC AC Specifications Input Tone Voltage 10 50 1000 mVp-p FSKInput Impedance 10 24 kohms VCO Minimum Frequency R = 100 kohms C = 22 uF 1 Hz VCO Maximum Frequency R = 10 kohms C= 470 pF 90 kHz VCOLoop Gain 8 Radians/Sec/V Phase Comparator Gain 2 V/Radians Electrricaal Chaarraacterristics (VDD = 5.0V, T = 25o C) ©2004-22014 Mixeed Signal Inteegratioon 2Weeb Sitee ““www.mix-ssig.coom”” M SDET Prrinciples of Operraation The VCO in the MSDET oscillates at twice the detected frequency. The formula used for the tone detection is: fVCO = 1/(3.35.R.C) Internal flip-flops generate the quadrature clock need- ed for both FSK detection and coherent carrier detect. This is fed to two phase comparators. The QOUT of the MSDET is filtered and tied to VIN to close the loop and allow the phase error to control the VCO frequency. With all analog PLLs there is a tendency to lock to third-harmonic of the desired tone. By using exter- nal filters and coupling capacitors, this characteristic can be minimized. The application schematic of the MSDET shows a low-value input coupling capacitor applying received signals to the input gain stage. This reduces sub-harmonic lock. VREF CV I N QOUT LOUT NC4 NC5 NC6 VDD R IN LPOUT LPIN DIN DOUT VSS

C2 1.0uF 12kohm 75kohm 33nF 1.5nF RECEIVED_SIGNALC5 150pF 100kohm 1.0kohm 1.0Mohm 1.0kohm 30kohm 33nF 1.0Mohm R10 51kohm 200nF R11 200kohm LOCK_DETECT_OUT DATA_OUTPUT MSDET VREF QOUT LOUT NC4 NC5 NC6 VDD C VSSA DOUT DIN LPIN LPOUT IN R VIN 100kohm Tone Dettecttor Datta Sheett ©2004-22014 Mixeed Signal Inteegratioon 3Weeb Sitee ““www.mix-ssig.coom”” M SDET Mixed Signal Integration Corporation reserves the right to change any product or specification without notice at any time. Mix ed Signal Integration products are not designed or authorized for use in life support systems. Mixed Signal Integration assumes no respo nsibility for errors in this document.

©2004-22014 Mixeed Signal Inteegratioon 4Weeb Sitee ““www.mix-ssig.coom”” M SDET STANDARD PRODUCTS MSGEQ5A Five Band Graphic Equalizer MSGEQ7 Seven Band Graphic Equalizer MSHFS1-6 Selectable High Frequency LP/BP Filter MSFS1-6 Selectable Lowpass/Bandpass Filter MSCAHF Selectable High Frequency Active Lowpass/Bandpass Filter MSU1F1-4, MSU2F1 Resistor Programmable Universal Active Filter MSU1HF1-4, MSU2HF1 High Frequency Resistor Programmable Universal Active Filter MSELP Switched Capacitor Elliptic Lowpass Filter with Op Amps MSNBLP Switched Capacitor Butterworth Lowpass Filter MSLE/B/C5L/M Switched Capacitor General Purpose Lowpass Filter MS2LFS Dual Selectable Low Voltage Lowpass/Bandpass Filter MSLFS Selectable Low Voltage Lowpass/Bandpass Filter MSHN1-6 Selectable High Pass/Notch Filter MSRAAF Resistor Programmable Active Audio Filter MSRAHF Resistor Programmable Active High Frequency Filter MSDET Tone Detector MSEPAF Electrically Programmable Active Filter MSCBT Communications Baseband Transceiver MSLV14 14 MHz Video Lowpass Filter Mixed Signal Integration 2157-50 O'Toole Avenue San Jose, California 95131-1332 Phone: (408)-434-6305 In Mississippi, Alabama, Georgia South Carolina, North Carolina, and Tennessee contact: Adeptronics

9694 Madison Boulevard Suite A-14

Madison, Alabama 35758 Telephone: 256-772-1922 Facsimile: 256-772-0323 In Arizona, Utah, Colorado, Montana, In Indiana, Kentucky, Ohio, Michigan, In Taiwan contact: Wyoming, Idaho, New Mexico and and western Pennsylvania contact: southern Nevada contact: Nelco Electronix CCR Electronics, Inc. Maxtek Technology Co., Ltd. 6970 S. Holly Circle 825 Woodfield Crossing Blvd 5F, No. 13-20, Sec. 6, Min Chian E Road, Nei Hu Englewood, CO 80112 Suite 100 Taipei, 114 R.O.C. Telephone: 720-493-9630 Indianapolis, Indiana 46240-2495 Telephone: 886-2-2794-6060 Facsimile: 720-493-9631 Telephone: 317-469-4855 Facsimile: 886-2-2879-8922 In Hong Kong and the People's In Korea contact: In Singapore, Indonesia and Republic of China contact: Malaysia contact: Alphatron H. B. Corp. EXER Technologies (S) PTE LTD 2L, Cooke Street/F #1409, Seocho World Officetel, 45 Kaki Bukit Industrial Terrace G/F, Hung Hom 1355-3, Seocho-Dong, Seocho-Ku, Singapore 416125 Kowloon Bay, Hong Kong Seoul, Korea 137-070 Telephone: (65)-6-747-9669 Telephone: 852-2303-1290 Telephone: (02)3472-3450 Facsimile: (65)-6-749-9669 Facsimile: 852-2900-3616 Facsimile: (02)3472-3458 In Israel contact: In the United Kingdom contact: Phoenix Technologies Ltd. Electronics 2000 Ltd. 3 Gavish St. Grafton House Kfar-Saba, 44424 Grafton Street Isreal High Wycombe Telephone: 09-764-4800 Bucks HP12 3AJ Facsimile: 09-764-4801 Telephone:00-44-1494-444044 Facsimile: 00-44-1494-470499 Catch our web site at "http://www.mix-sig.com" Send us e-mail at "info@mix-sig.com"