Table 2. Key properties of the Chebyshev notch AFE.
| Property | Value | Units/comments |
|---|---|---|
| Supply voltage | ±5, ±2.5 | Volts |
| Gain | 60, 80 | dB (programmable) |
| Integrated noise | 26 | nV rms (0.5–40 Hz) |
| 33 | nV rms (0.5–100 Hz) | |
| 96 | nV rms (0.5–500 Hz) | |
| CMRR | 130 | dB (DC to 60 Hz) |
| Maximum tolerable differential DC offset | ±32/85a | mV |
| Dynamic range | ±2.3 | mV (peak), gain = 1000 |
| ±230 | μV (peak), gain = 10000 | |
| SNR | 30 | dB (minimum) |
| Nonlinearity | <0.2% | THD |
| High-pass corner | 0.5 | Hz |
| Low-pass corner | 500 | Hz |
| Total current consumption | 32 | mA |
| Hours of continuous operation | 28 | h (900 mAh battery) |
a
Measured differential DC offset rejection of 85 mV is achieved when a 1st order analog 0.5 Hz high-pass filter is cascaded after the front-end INA (stage 1 of the current AFE).