PCM1748KE

PCM1748KE Application Field and Working Principle

The PCM1748KE is a high performance, ultra-low power, 24-bit delta sigma ADC featuring integrated linear interpolation and 2x digital interpolation filters. It is ideally suited for applications in professional audio, consumer electronics, portable communications and general purpose data acquisition systems.

In terms of its application field, the PCM1748KE is designed for high-accuracy, high-performance analog-to-digital conversion applications that require low power consumption. This ADC is capable of achieving 24-bit accuracy at data rates up to 192 kHz. It has an ultra-low power consumption of less than 3 mW at 8 kHz conversion rate and up to 15 mW at 192 kHz.

In order to maximize its performance, the PCM1748KE has a fully integrated charge scaling DAC, high-voltage amplifier (HVSw), on-board clock with low-jitter clock generator and temperature-controlled oscillator (TCXO). It also features an integrated linear interpolation filter that allows for simultaneous sampling of two signals with a 32 dB reduction in spurious artifacts.

The PCM1748KE uses an ultra-low-power predictive type ADC based on the delta-sigma modulator architecture. It incorporates a two-stage modulator, a low-noise voltage reference, low pass filters (LPFs) and a flash ADC (Analog to Digital Converter). The integrator stage performs feedback sampling and adds the digital output to the input signal. The amplifier stage amplifies the difference between the input and the output of the integrator. The low-noise reference and the high pass filters provide the necessary level and frequency of the signal. The flash ADC then converts the output of the amplifier stage into digital form.

The PCM1748KE also incorporates an ultra-low power, high-performance digital interpolation filter. This filter employs a nearly-unique non-linearity reduction technology that can reduce harmonics distortion by more than 50 dB. The PCM1748KE also features an on-chip Digital to Analogue Converter (DAC) which provides a high precision digital-to-analogue conversion with low power consumption.

In conclusion, the PCM1748KE is an ideal high-accuracy, low-power, 24-bit delta sigma ADC specifically designed for applications in professional audio, consumer electronics, portable communications and general purpose data acquisition systems. It is highly suitable for applications requiring ultra-low power consumption and the capacity to achieve 24-bit accuracy at data rates up to 192 kHz.