The ADC121S021 device is a low-power, single-channel CMOS 12-bit analog-to-digital converter with a high-speed serial interface. Unlike the conventional practice of specifying performance at a single sample rate only, the ADC121S021 is fully specified over a sample rate range of 50 ksps to 200 ksps. The converter is based upon a successive-approximation register architecture with an internal track-and-hold circuit.
The output serial data is straight binary, and is compatible with several standards, such as SPI™, QSPI™, MICROWIRE, and many common DSP serial interfaces.
The ADC121S021 operates with a single supply that can range from 2.7 V to 5.25 V. Normal power consumption using a 3.6-V or 5.25-V supply is 1.5 mW and 7.9 mW, respectively. The power-down feature reduces the power consumption to as low as 2.6 µW using a 5.25-V supply.
The ADC121S021 is packaged in 6-pin WSON and SOT-23 packages. Operation over the industrial temperature range of –40°C to 85°C is ensured.
| Resolution (Bits) | 12 |
| Sample rate (max) (ksps) | 200 |
| Number of input channels | 1 |
| Interface type | Microwire (Serial I/O), SPI |
| Architecture | SAR |
| Input type | Single-ended |
| Rating | Catalog |
| Reference mode | Supply |
| Input voltage range (max) (V) | 5.25 |
| Input voltage range (min) (V) | 0 |
| Features | Small Size |
| Operating temperature range (°C) | -40 to 85 |
| Power consumption (typ) (mW) | 1.5 |
| Analog supply (min) (V) | 2.7 |
| Analog supply voltage (max) (V) | 5.25 |
| SNR (dB) | 72.3 |
| Digital supply (min) (V) | 2.7 |
| Digital supply (max) (V) | 5.25 |
| SOT-23 (DBV) | 6 | 8.12 mm² 2.9 x 2.8 |
| WSON (NGF) | 6 | 5.5 mm² 2.5 x 2.2 |
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