16 Bit Sigma Delta AD Converter

This macro-cell is a single-channel 16-bit oversampling ADC intended for digital audio bandwidth applications. Supplied with 1.2V, the analog and the digital supply is kept separate in order to decrease noise. A master clock has to be provided at a frequency of 128 x Fs. The use of a differential input signal provides increased dynamic range and excellent power supply rejection characteristics. Never¬theless, a single-ended input can also be applied to the ADC by shortcircuiting one input to ground.
blocks for RESET and Power-Down are also present.
The digital part consists basically of a triple-stage Finite-Impulse-Response Decimation Filter required for down sampling and lowpass filtering
data coming from the Sigma-Delta modulator, preserving linear-phase. The output data is a digital stream with a clock frequency of 16 x Fs (16 x 48 KHz)..

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