description

The selectable bandpass filter IC Is a CMOS chip that can be configured for a bandpass filter. The band pass response can be a six pole full, third or sixth octave bandpass filter. The device uses switched-capacitor filters and no external components (except for decoupling capacitors) are required, Only an external CMOS level clock is needed.

Externally selectable gain setting pin is included in the 8 pin device. Typical current consumption is as low as 200 uA and the minimum operating voltage is 2.7 volts, making the device ideal for portable applications. MSFB3G and MSFB6G are low current, lower frequency versions.

features

  • Three Filter Types In One Package
  • No External Components
  • Switched-Capacitor Filters
  • Low Power Operation
  • Low Voltage Operation
  • Adjustable Gain 0, 10 or 20 dB
  • Small Package Size
  • Low Cost
  • On Chip Power Save Pin
  • ANSI Compatible Bandpass

applications

  • Spectrum Analyzers
  • General Purpose Systems
  • Portable Systems
  • Anti-Alias Filters
  • Reconstruction Filters
  • Telecommunications
  • Tracking Filters
  • Harmonic Analysis
  • Noise Analysis
  • Data Communication
  • Wireless Applications
  • Sensor Signal Processing

 

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

For processing signals from a sensor or MEMS device, the Smart Programmable Sensor Interface (MSSPSI) is a monolithis CMOS integrated circuit. Small analog Signals from a sensor or MEMS are anti-aliasesd, filered and amplified before being converted into a digital signal output by the MSSPSI. These processing functions are controlled by an external uP through the MSSPSI's on-chip serial interface. The MSSPSI 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 Bliptic switched capacitor anti-aliasing filters. The gain of the filter is controllable via the serial interface up to 18 dB (6dB) steps. The next stage is a 6 pole Butterworth switched capacitor highpass filter, also with up to 10dB 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 MSSPSI operates with a supply voltage from 3.3 VDC up to 5.5 VDC. It is available in a 32 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
  • Low pass 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 and 4 input Mux

applications

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

 

description

 This integrated circuit provides a charge pump and ASK/PSK demodulation/modulation for self powered or passive backscatter applications. The device meets FCC 47CFR18.307 for transmit power level.

The MSRFIF operates from 50 Hz up to 250 MHz. The MSRFIF requires no batteries to function. The devices is powered by RF energy from the reader. The RFIF has a voltage output for powering microcontrollers, preamps and other circuits. The MSRFIF includes the duplexer for a transmitter and receiver to share the same antenna.

Demodulated data is provided on the DEMOD pin or pad for connection to a microprocessor for decoding. The MOD1/2 inputs provides modulation of the ID from the microprocessor.

No battery is needed for low power processors (less than 50 uA). A received signal strength detector keeps the logic off until a strong enough signal is received. PDO output provides a trigger only when RSSI is activated.

features

  • Up to 250 MHz Operation
  • AM Demodulation and AM modulation with pin selectable AM modulation depth
  • Bi-Phase PDK demodulation
  • Receive Signal Strength Indicator
  • Power Saving Circuit
  • 8 Pin Package or die form
  • DC output for low power controllers (50 uA)

applications

  • Remote Medical Reading and Monitors
  • Theft Detection
  • Security Systems
  • Inventory Control
  • Access Cards
  • Automotive Key Identification
  • Pet Identification
  • Mobile Commerce
  • Airline Baggage Identification
  • Sensor Transceiver

 

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