LTC2379-18 Typical Application Circuit The LTC2379-18 is a low noise, low power, high speed 18-bit successive approximation register (SAR) ADC. The LTC2379-18 operates from a single 2.5V supply and has a fully differential input range of ±VREF (VREF varies from 2.5V to 5.1V). The LTC2379-18 consumes only 18mW of power and achieves ±2LSB INL (maximum), no missing codes (at 18 bits) and 101.2dB SNR. Reverse Conducting Thyristor(RCT)
Reverse Conducting Thyristor(RCT) is also called Reverse- appreciation Thyristor.The characteristic is that a diode is connected in reverse parallel between the anode and cathode of thyristor, so that the transmitting junction of anode and cathode is short-circuited.As a result of this special circuit structure, it has high voltage resistance, high temperature resistance, short turn-off time, low switching voltage and other good performance.For example, the turn-off time of the reverse thyristor is only a few microseconds, and the working frequency is dozens of KHZ, which is better than the fast thyristor (FSCR).This device is suitable for switching power supply and UPS uninterrupted power supply. One RCT can replace one thyristor and one continuous current diode respectively.
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The LTC2379-18 features a high-speed SPI-compatible serial interface that supports 1.8V, 2.5V, 3.3V, and 5V logic, as well as a daisy-chain mode. The high throughput rate and cycle-free latency of 1.6Msps make the LTC2379-18 ideal for many high-speed applications. An internal oscillator is responsible for setting the conversion time, which alleviates external timing considerations. The LTC2379-18 automatically powers down between conversion operations, reducing the power consumption that is regulated with the sample rate.
The LTC2379-18 features a unique digital gain compression (DGC) feature that eliminates the negative supply of the driver amplifier and maintains the full resolution of the ADC. When enabled, the ADC performs a digital scaling function that converts the zero-scale code from 0V to 0.1?VREF and the full-scale code from VREF to 0.9?VREF. For a typical 5V reference, the full-scale input range is now 0.5V to 4.5V, which provides enough peak reserve for powering the driver amplifier from a single 5.5V supply.