Contents
What is a good SNR for ADC?
I hear again and again that an ADC’s ideal SNR is 6.02N+1.76 dB (excluding delta-sigma converters).
What is the SNR of a 16-bit ADC?
80 dBfs
16-Bit ADC Specs 80 dBfs SNR.
How do I find my ADC resolution?
ADC has a resolution of one part in 4,096, where 212 = 4,096. Thus, a 12-bit ADC with a maximum input of 10 VDC can resolve the measurement into 10 VDC/4096 = 0.00244 VDC = 2.44 mV. Similarly, for the same 0 to 10 VDC range, a 16-bit ADC resolution is 10/216 = 10/65,536 = 0.153 mV.
How does oversampling increase the dynamic range of SAR ADCs?
Increasing the oversampling ratio (OSR) results in overall reduced noise and the DR improvement due to oversampling is ΔDR = 10log10 (OSR) in dB. Besides oversampling with a Δ-Σ ADC, oversampling a high throughput SAR ADC can improve antialiasing and reduce overall noise.
How is oversampling used in high throughput ADCs?
Besides oversampling with a Δ-Σ ADC, oversampling a high throughput SAR ADC can improve antialiasing and reduce overall noise. In many cases, oversampling is inherently used and implemented well in Δ-Σ ADCs with an integrated digital filter and decimation functionality.
How can oversampling and averaging improve SNR resolution?
Oversampling and averaging can be used to increase measurement resolution, eliminating the need to resort to expensive, off-chip ADCs. Oversampling and averaging will improve the SNR and measurement resolution at the cost of increased CPU utilization and reduced throughput.
Can a higher resolution off-chip ADC be used?
For this reason, many systems employ a higher resolution off-chip ADC. However, there are techniques that can be used to achieve higher resolution measurements and SNR. This application note describes utilizing oversampling and averaging to increase the resolution and SNR of analog-to-digital conversions.