1 Features

• Specified Over a Range of Sample Rates
• Variable Power Management
• Single Power Supply With 2.7-V to 5.25-V Range
• Compatible With the SPI, QSPI, MICROWIRE, and DSP
• Key Specifications:
  • DNL: 0.45 and –0.25 LSB (Typical)
  • INL: 0.45 and –0.4 LSB (Typical)
  • SNR: 72.3 dB (Typical)
  • Power Consumption
    • 3.6-V Supply: 1.5 mW (Typical)
    • 5.25-V Supply: 7.9 mW (Typical)

2 Applications

• Portable Systems
• Remote Data Acquisition
• Instrumentation and Control Systems

3 Description

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.

1. For all available packages, see the orderable addendum at the end of the data sheet.

Key Graphic