Supervisory Circuits Watchdog Supervisor with MR. IC.

The MAX1471 low-power, CMOS, superheterodyne, RF dual-channel receiver is designed to receive both amplitude-shift-keyed (ASK) and frequency-shift-keyed (FSK) data without reconfiguring the device or introducing any time delay normally associated with changing modulation schemes. The MAX1471 requires few external components to realize a complete wireless RF digital data receiver for the 300MHz to 450MHz ISM bands.The MAX1471 includes all the active components required in a superheterodyne receiver including: a low-noise amplifier (LNA), an image-reject (IR) mixer, a fully integrated phase-locked loop (PLL), local oscillator (LO), 10.7MHz IF limiting amplifier with received-signal-strength indicator (RSSI), low-noise FM demodulator, and a 3V voltage regulator. Differential peak-detecting data demodulators are included for both the FSK and ASK analog baseband data recovery. The MAX1471includes a discontinuous receive (DRX) mode for low-power operation, which is configured through a serial interface bus.The MAX1471 is available in a 32-pin thin QFN package and is specified over the automotive -40°C to +125°C temperature range.ApplicationsAutomotive Remote Keyless Entry (RKE)Garage Door OpenersHome AutomationLocal Telemetry SystemsMedical SystemsSecurity SystemsTire-Pressure Monitoring SystemsWireless KeysWireless Sensors

Fast, Voltage-Out, DC to 440 MHz, 95 dB Logarithmic Amplifier Features: Multistage demodulating logarithmic amplifier Voltage output, rise time <15 ns High current capacity: 25 mA into grounded RL 95 dB dynamic range: –91 dBV to +4 dBV Single supply of 2.7 V min at 8 mA typ DC to 440 MHz operation, ±0.4 dB linearity Slope of +24 mV/dB, intercept of –108 dBV Highly stable scaling over temperature Fully differential dc-coupled signal path 100 ns power-up time, 1 mA sleep current

RF Vector Modulator 1.5 GHz TO 2.4 GHz Features: Cartesian amplitude and phase modulation 1.5 GHz to 2.4 GHz frequency range Continuous magnitude control of −4.5 dB to −34.5 dB Continuous phase control of 0° to 360° Output third-order intercept 17.5 dBm Output 1 dB compression point 8.5 dBm Output noise floor −150.5 dBm/Hz at full gain Adjustable modulation bandwidth up to 230 MHz Fast output power disable 4.75 V to 5.25 V single-supply voltage 

Digitally Programmable Sensor Signal Amplifier with EMI Filters Features: EMI filters at input pins Specified from −40°C to +140°C Low offset voltage: 10 μV maximum Low input offset voltage drift: 65 nV/°C maximum High CMRR: 94 dB minimum Digitally programmable gain and output offset voltage Programmable output clamp voltage Open and short wire fault detection Low-pass filtering Single-wire serial interface Stable with any capacitive load SOIC_N and LFCSP_VQ packages 4.5 V to 5.5 V operation

Single-Supply, Low Power, Precision FET Input Quad Buffer Features: Low power 250 μA maximum supply current per amplifier FET input 2 pA maximum input bias current at 25°C Extremely high input impedance Low noise 13 nV/√Hz voltage noise at 1 kHz 0.4 μV p-p voltage noise (0.1 Hz to 10 Hz) 0.8 fA/√Hz current noise at 1 kHz High dc precision 3 μV/°C maximum offset drift (B grade) 3 MHz bandwidth Unique pinout No leakage from inputs to supply pins Provides guarding capability Rail-to-rail output Single-supply operation Input range extends to ground Wide supply range Single-supply: 3 V to 36 V Dual-supply: ±1.5 V to ±18 V  Available in a compact 10-lead MSOP

10 MHz, G = 1, 10, 100, 1000 iCMOS Programmable Gain Instrumentation Amplifier Features: Small package: 10-lead MSOP Programmable gains: 1, 10, 100, 1000 Digital or pin-programmable gain setting Wide supply: ±5 V to ±15 V Excellent dc performance High CMRR: 100 dB (minimum), G = 100 Low gain drift: 10 ppm/°C (maximum) Low offset drift: 1.2 µV/°C (maximum), G = 1000 See data sheet for additional features

High Voltage, Latch-Up Proof, 16-Channel Multiplexer Features: Latch-up proof 3.5 pF off source capacitance 64 pF off drain capacitance 0.35 pC typical charge injection ±0.02 nA on channel leakage Low on resistance: 155 typical ±9 V to ±22 V dual-supply operation 9 V to 40 V single-supply operation VSS to VDD analog signal range Human body model (HBM) ESD rating - 8 kV all other pins

Dual Channel, 16-Bit, 16 MUPS, Multispan, Multi-IO SPI DAC Features: 16-bit resolution 16 MUPS single channel rate in fast mode 11 MUPS single channel rate in precision mode 78 ns small signal settling time to 0.1% accuracy 100 ns large signal settling time to 0.1% accuracy Ultrasmall glitch: <50 pV×s Ultralow latency: 5 ns THD: −105 dB at 1 kHz Highly configurable output voltage span and offset 1.2 V and 1.8 V logic level compatible Single (classic) and dual SPI modes Multiple error detectors, both analog and digital domains 2.5 V internal voltage reference, 10 ppm/°C maximum temperature coefficient Small package: 4 mm × 4 mm LFCSP

Dual Channel, 16-Bit, 33 MUPS, Multispan, Multi-IO SPI DAC Features: 16-bit resolution 33 MUPS single channel rate in fast mode 22 MUPS single channel rate in precision mode 65 ns small signal settling time to 0.1% accuracy 100ns large signal settling time to 0.1% accuracy Ultra small glitch: < 50 pV×s Ultra low latency: 5 ns THD: −105 dB at 1 kHz Highly configurable output voltage span and offset 1.2 V and 1.8 V logic level compatible Single (classic), dual, and quad SPI modes Multiple error detectors, both analog and digital domains 2.5 V internal voltage reference, 10 ppm/°C maximum temperature coefficient 5 mm × 5 mm LFCSP