The ADS7891 is a 14-bit 3-MSPS A-to-D converter with 2.5-V internal reference. The device includes a capacitor based SAR A/D converter with inherent sample and hold. The device offers a 14-bit parallel interface with an additional byte mode that provides easy interface with 8-bit processors. The device has a pseudo-differential input stage.
The –IN swing of ±200 mV is useful to compensate for ground voltage mismatch between the ADC and sensor and also to cancel common-mode noise. With nap mode enabled, the device operates at lower power when used at lower conversion rates. The device is available in a 48-pin TQFP package.
| Resolution (Bits) | 14 |
| Sample rate (max) (ksps) | 3000 |
| Number of input channels | 1 |
| Interface type | Byte-Wide, Parallel |
| Architecture | SAR |
| Input type | Pseudo-Differential, Single-ended |
| Rating | Catalog |
| Reference mode | External, Internal |
| Input voltage range (max) (V) | 2.5 |
| Input voltage range (min) (V) | 0 |
| Features | Oscillator |
| Operating temperature range (°C) | -40 to 85 |
| Power consumption (typ) (mW) | 85 |
| Analog supply (min) (V) | 4.75 |
| Analog supply voltage (max) (V) | 5.25 |
| SNR (dB) | 78.5 |
| Digital supply (min) (V) | 2.7 |
| Digital supply (max) (V) | 5.25 |
| TQFP (PFB) | 48 | 81 mm² 9 x 9 |
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