Overview
The ADC122S021CIMM from Texas Instruments is a low-power, two-channel 12-bit analog-to-digital converter (ADC) designed for high-speed and low-power applications. This CMOS-based ADC features a successive-approximation register architecture and an internal track-and-hold circuit. It operates over a sample rate range of 50 ksps to 200 ksps and is compatible with several serial interfaces such as SPI, QSPI, and MICROWIRE. The device is packaged in an 8-lead VSSOP package and supports a single power supply ranging from 2.7V to 5.25V, making it suitable for various portable and remote data acquisition systems.
Key Specifications
| Parameter | Conditions | Typical Limits | Units |
|---|---|---|---|
| Resolution | - | 12 Bits | - |
| Integral Non-Linearity (INL) | VA = +2.7V to +5.25V | ±0.35 LSB | LSB |
| Differential Non-Linearity (DNL) | VA = +2.7V to +5.25V | +0.4 / -0.2 LSB | LSB |
| Signal to Noise Ratio (SNR) | VA = +2.7V to +5.25V | 72.0 dB | dB |
| Power Consumption | VA = +3V | 2.2 mW | mW |
| Power Consumption | VA = +5V | 7.9 mW | mW |
| Power Down Consumption | VA = +3V, CS high | 0.14 µW | µW |
| Power Down Consumption | VA = +5V, CS high | 0.32 µW | µW |
| Sample Rate | - | 50 ksps to 200 ksps | ksps |
| Maximum Clock Frequency | - | 3.2 MHz | MHz |
| Conversion Time | - | 13 SCLK cycles | SCLK cycles |
| Throughput Time | - | 16 SCLK cycles | SCLK cycles |
Key Features
- Low-power consumption with 2.2 mW at 3V and 7.9 mW at 5V supply.
- Power-down feature reducing power consumption to 0.14 µW at 3V and 0.32 µW at 5V.
- Two analog input channels (IN1 and IN2) with variable power management.
- High-speed serial interface compatible with SPI, QSPI, MICROWIRE, and other common DSP serial interfaces.
- Single power supply operation from 2.7V to 5.25V.
- No missing codes and high accuracy with ±0.35 LSB INL and +0.4 / -0.2 LSB DNL.
- Compact 8-lead VSSOP package.
- No power-up delays or dummy conversions required.
Applications
- Portable systems: Ideal for battery-powered devices due to its low power consumption.
- Remote data acquisition: Suitable for remote sensing and data logging applications.
- Instrumentation and control systems: Used in various industrial and medical instruments.
- Automotive and industrial automation: Applicable in systems requiring high accuracy and low power.
Q & A
- What is the resolution of the ADC122S021?
The ADC122S021 has a resolution of 12 bits.
- What is the sample rate range of the ADC122S021?
The sample rate range is from 50 ksps to 200 ksps.
- What is the power consumption of the ADC122S021 at 3V and 5V supply?
The power consumption is 2.2 mW at 3V and 7.9 mW at 5V.
- How many analog input channels does the ADC122S021 have?
The ADC122S021 has two analog input channels (IN1 and IN2).
- What is the maximum clock frequency for the ADC122S021?
The maximum clock frequency is 3.2 MHz.
- Does the ADC122S021 require power-up delays or dummy conversions?
No, the ADC122S021 does not require power-up delays or dummy conversions.
- What is the typical signal to noise ratio (SNR) of the ADC122S021?
The typical SNR is 72.0 dB.
- What is the power consumption in power-down mode at 3V and 5V supply?
The power consumption in power-down mode is 0.14 µW at 3V and 0.32 µW at 5V.
- What type of package does the ADC122S021 come in?
The ADC122S021 is packaged in an 8-lead VSSOP package.
- Is the ADC122S021 compatible with any specific serial interfaces?
Yes, it is compatible with SPI, QSPI, MICROWIRE, and other common DSP serial interfaces.
