description

The Tone Detector (MSDET) is a monolithic CMOS integrated circuit for processing analog signals before microcontroller operations. The MSDET contains an I and Q detector driven by a Voltage controlled oscillator. The center frequency of the tone detection is one-half of the VCO oscillating frequency. Center frequencies from 1 Hz to 100 kHz can be detected, and FSK decoded. The MSDET is an analog PLL with improved noise immunity when compared to a digital design.

By using the MSDET to demodulate and detect FSK or tones a slower, lower cost microcontroller can be used. This reduction in microcontroller clock rate also reduces the problems with RF emissions for FCC and CE approvals. The MSDET operates with a single supply voltage from 2.7 VDC to 5.5 VDC

The MSDET is superior to industry standard tone decoders in that control of chatter and bandwidth can be adjusted with external resistors or capacitors

The MSDET is available in a 16-pin SOIC (150 mil wide). Industrial temperature range (-40 to +85oC) is available.

features

  • Low Power Consumption:
  • Typically less than 2.0 mW at 2.7V
  • Analog PLL: Better noise immunity over simple DSP counter techniques

applications

  • 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

 

description

The Controller Programmable Sensor Interface (MSCPSI) is a hybrid package containing two CMOS integrated circuits for processing signals from either a sensor or MEMS device. Small analog signals are amplified, anti-aliased, and filtered before being converted into a digital signal output by the MSCPSI. These processing functions are controlled by an internal PICTM processor through the MSCPSI's on-chip serial interface. The MSCPSI also includes offset adjust, low power modes and an on-chip temperature sensor.

The input is fed into a low noise amplifier followed by two 6th order Elliptic switched capacitor anti-aliasing filters. The gain of the filter is controllable via the serial interface up to 18 dB (6 dB steps). The next stage is a 6 pole Butterworth switched capacitor highpass filter, also with up to 18 dB of controllable gain. Following this is a 7th order Elliptic switched capacitor lowpass filter. These internal filters can be bypassed via the serial interface. The 12 bit, 160 ksps A-to-D converter provides a digital output.

The MSCPSI operates with a supply voltage from 3.3 VDC up to 5.5 VDC. It is available in a 64 pin LQFP Package with an industrial temperature range.

features

  • Low Power Modes
  • Low Noise Input: <30 nV/(Hz)1/2 at 100 Hz
  • Anti Alias Filter with Adjustable Gain
  • Lowpass Filter with Adjustable Gain Stage
  • Programmable SC Highpass Filter with Gain Adjust
  • Programmable SC Lowpass Filter with Gain Adjust
  • Temperature Sensor
  • Offset Adjust
  • 12 bit 160 ksps A-to-D Converter 4 input Mux
  • 14-bit PICTM Processor with 2k FLASH memory
  • 10-bit 10 ksps A-to-D Converter w/ 5 input Mux

applications

  • Low Noise Sensors
  • MEMS Interface
  • Accelerometer Sensing
  • Pressure Sensing
  • Vibration Sensing
  • Temperature Sensing
  • Test Equipment Cards/Data Acquisition Cards

 

description

The MSSCSA is a single chip 1/6th octave-wide 6 band spectrum analyzer whose center frequencies are controlled by a single master clock. The center frequencies are set at 1.12246, 1.2599, 1.4142, 1.5874, 1.78179 and 2 (normalized). The sample to corner is 25:1 for the 2 Hz normalized output and 44.545:1 at the 1.122 Hz normalized output. The MSSCSA's 1.178179 Hz output is @ MHZ ( Clock at 25 MHz). Multiple MSSCSA can be connected for spectrum analysis by taking the master clock of the high frequency filter and dividing by 2..

The MSSCSA includes two uncommitted op amps for adding additional fixed gain for microphone or other low level applications. A digitally programmable gain stage provides 0, 10 or 20 dB of gain. The PD pin selects power down, low power for ultrasonic applications and regular power for at 2 MHz frequency operation. The MSSCSA is fabricated in 0.6 um CMOS process for low power consumption and operation from 3.0 to 5.5 VDC

features

  • Selectable Power Modes
  • Regular Power Consumption: 17 mA at +5V
  • Low Power Consumption: 6 mA at +5V
  • Power Down Mode
  • Operates from 3.0 V to 5.5 VDC
  • Six 6 pole Bandpass filters in one package
  • Digitally controlled gain stage
  • Two Uncommitted Op Amps
  • No Microprocessor Needed

applications

  • Real-Time Spectrum Analysis
  • Audio and Ultrasonic Analysis
  • Vibration Analysis

 

description

The MSCBT IC is a CMOS chip that has the analog signal processing functions required by cellular phones and radio and other full duplex and half duplex devices.

The MSCBT integrated circuit allows bi-directional transmit and receive gain volume and filtering for the voice band. In addition, the MSCBT provides the filter needed for Continuous Tone Control Squelch System (CTCSS) and Continuous Digital Control Squelch System (CDCSS) generation and detection. A comparator in the MSCBT allows for the recovered squelch or DTMF tones to be applied to a microcontroller for decoding.

An internal highpass filter attenuates the tones from the voice band, by 50 dB, preventing voice from effecting tone transmission. A limiter increases the voice signals to be transmitted to 2Vpp for more effective modulation. The transmit output is filtered to a selectable 2.55 or 3kHz bandwidth before gain adjusts. A differential output is provided for interface with a variety of FM transmitter choices.

The MSCBT will operate from 3.3 V to 5.5 VDC. The MSCBT is available in a 32 pin 7x7mm LQFP.

features

  • Function down to 3.3 VDC
  • Low Power Consumption
  • 50 CTCSS Squelch Tones filtered
  • CDCSS Code filter
  • Programmable filter for pre-detection filtering
  • Comparator for direct uP interface of detected signals

applications

  • Family Radio Service (FRS) 2-way Radio
  • Land Mobile Radio (LMR) 2-way Radios
  • General Mobile Radio Service (GMRS) 2-way Radios
  • Low Power Radio Service (LPRS) 2-way Cellular
  • Non-standard Voice-based communications
  • Wired and Wireless Intercom
  • Half-Duplex Speakerphone Analog Signal Processing
  • Full-Duplex Speakerphone Analog Signal Processing

 

description

The MSVL14 provides a fourth-order video Lowpass Butterworth response filter with a corner at 14 MHz for use in Luminance filtering in HDTV or other higher resolution video systems. The MSVL14 is a continuous time filter with greater than 3% accuracy.

Unlike digital filters or other sample data filters, the MSVL14 does not use a sampling clock. The filter's corner frequency is set by internal capacitors and resistors. Only decoupling capacitors on the supplies and a bias resistor to set the operating current are needed to operate the MSVL14.

The elimination of clocking reduces noise generated by the clock as well as reduces distortion.

The MSVL14 is available in a 16-Pin 150 mil SOIC.

features

  • Provides Lowpass filter at 14 MHz
  • Better than 3% accuracy
  • Continuous Time Lowpass FIlters
  • No Clock Noise
  • Operates from 4.5 to 5.5 VDC
  • Low distortion
  • No Clock Required
  • Fourth Order Butterworth Response

applications

  • Video Filter
  • HDTV to Analog Converter boxes for older TVs
  • Non-Standard Communications
  • Radar
  • Luminance Filtering
  • High resolution video filtering