The ADS7844 is an 8-channel, 12-bit sampling analog-to-digital converter (ADC) with a synchronous serial interface. Typical power dissipation is 3mW at a 200kHz throughput rate and a +5V supply. The reference voltage (VREF) can be varied between 100mV and VCC, providing a corresponding input voltage range of 0V to VREF. The device includes a shutdown mode which reduces power dissipation to under 1µW. The ADS7844 is guaranteed down to 2.7V operation.
Low power, high speed, and on-board multiplexer make the ADS7844 ideal for battery- operated systems such as personal digital assistants, portable multichannel data loggers, and measurement equipment. The serial interface also provides low-cost isolation for remote data acquisition. The ADS7844 is available in a 20-lead QSOP package and the MAX147 equivalent 20-lead SSOP is guaranteed over the –40°C to +85°C temperature range.
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| Resolution (Bits) | 12 |
| Sample rate (max) (ksps) | 200 |
| Number of input channels | 8 |
| Interface type | SPI |
| Architecture | SAR |
| Input type | Pseudo-Differential, Single-ended |
| Multichannel configuration | Multiplexed |
| Rating | Catalog |
| Reference mode | External |
| Input voltage range (max) (V) | 5.25 |
| Input voltage range (min) (V) | 0 |
| Operating temperature range (°C) | -40 to 85 |
| Power consumption (typ) (mW) | 1.8 |
| Analog supply (min) (V) | 2.7 |
| Analog supply voltage (max) (V) | 5.25 |
| SNR (dB) | 73.1 |
| Digital supply (min) (V) | 1.9 |
| Digital supply (max) (V) | 5.5 |
| SSOP (DB) | 20 | 56.16 mm² 7.2 x 7.8 |
| SSOP (DBQ) | 20 | 51.9 mm² 8.65 x 6 |
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