Solutions Search - LTC1799 - 1kHz to 33MHz Resistor Set SOT-23 Oscillator

Temperature To Frequency Converter

Jan 30th 2001
This circuit directly converts temperature to digital data. In this case, a thermistor sensor biases the RSET pin. The LTC1799 frequency output is predictable, although nonlinear. The inverse RSET vs frequency relationship combines with the thermistor’s nonlinear characteristic to give Figure 8’s data. The curve is nonlinear, ...

40nVpp Noise, 0.05uV/C Drift, Chopped FET Amplifier

Jan 30th 2001
For very high precision low frequency applications, chopping the dc input signal to create an ac signal and then synchronously demodulating the signal to restore the dc value eliminates all static dc errors of the components used. This is a high gain (Av=1001) example with excellent low offset voltage and drift with temperature ...

Clock Tunable, Filter Based Sine Wave Generator

Nov 13th 2000
A feedback loop enclosed resonator can be made to oscillate. This circuit’s sine wave generator takes advantage of this and eliminates the need for an amplitude control loop. This circuit, a mildly modified form of the Regan resonant bandpass loop, is clock tunable and produces sine and cosine outputs. ...

Platinum RTD Digitizer Accurate within 1° Over 0°C to 100°C

Jun 24th 1999
Platinum RTD Value Is Linearly Converted to Period by LTC1799. Logic and Second LTC1799 Clock Digitize Period into Output Data Bursts. Bootstrapping Pin Capacitance is used to Permit Remotely Located Sensor. ...

Relative Humidity Sensor Digitizer-Time Domain Bridge Based

Jul 15th 1998
Humidity Transducer Digitizer Has Grounded Sensor, 1% Accuracy; Trim Scheme Allows Low Tolerance Sensors. Clocked Q1A-Q1B Configurations Produce Ramp Outputs. Q1A Ramp Slope Varies with Humidity Sensor Value, Q1B Ramp Represents Sensor’s Offset (0% RH does not equal 0pF). C1, C2 Digitize Ramp Times. Gate Extracts Time Difference, ...

Relative Humidity Sensor Digitizer-Charge Pump Based

Jul 15th 1998
Hygrometer Digitizer Has 0.3% Accuracy, Although Sensor Must Float Off-Ground. Humidity Sensor Determines Charge Delivered to A1 Integrator During Each Charge Pump Cycle. Resultant A1 Output Ramp Is Reset by Level Triggered C1 via Q1. Output Frequency, Taken at C1, Varies with Humidity ...

Relative Humidity Sensor Digitizer-Hetrodyne Based

Jun 5th 1998
Hetrodyne Based Humidity Transducer Digitizer Has Grounded Sensor, 2% Accuracy. Capacitively Sensed Hygrometer Beats Humidity Dependent Oscillator (C1) Against Stable Oscillator O1. Difference Frequency Is Demodulated by Q1, Converted to Pulse Form at C2. Counters Scale Output for 0kHz to 1kHz = 0% to 100% Relative Humidity ...

Clock Tuned, Highly Selective Notch Filter

Jan 1st 1998
This circuit shows a quick, clean way to tune a notch filter’s center frequency by varying a single resistor, which could be switched. The LTC1062 switched capacitor filter and A1 form a clock tunable notch (see LTC1062 data sheet). O1, running from the 5V supply, furnishes the clock, which is level shifted by Q1 to drive ...

A Galvanically Isolated Thermistor Digitizer

Dec 3rd 1997
The LTC1799 is a precision oscillator that is easy to use and occupies very little PC board space. The oscillator frequency is programmed by a single external resistor (RSET). The LTC1799 has been designed for high accuracy operation (≤1.5% frequency error) without the need for external trim components. ...

Counter Driven, Sine Encoded Memory Produces 0.75% Distortion Sinewave via D/A Converter

Jan 15th 1996
This circuit generates a variable frequency sine wave by continuously clocking a sine coded lookup table memory. The memory’s state is converted to an analog output by a DAC. A strength of this technique is its rapid, high fidelity response to frequency and amplitude change commands. ...