Overview
The ADS1112IDGST, produced by Texas Instruments, is a precision 16-bit Analog-to-Digital (A/D) converter designed for high-resolution measurements in compact and power-efficient applications. This device is available in MSOP-10 and leadless QFN-style packages, making it suitable for space-constrained designs. The ADS1112 features a continuously self-calibrating delta-sigma A/D converter core, an onboard 2.048V reference, a programmable gain amplifier (PGA), and an onboard clock oscillator. It supports two differential or three single-ended analog input channels and communicates via an I2C-compatible serial interface with eight selectable addresses.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Resolution | - | 12/14/15/16 | - | - | Bits |
| Full-Scale Input Voltage | - | ±2.048/PGA | - | - | V |
| Analog Input Voltage | - | GND - 0.2 to VDD + 0.2 | - | - | V |
| Differential Input Impedance | - | 2.8/PGA | - | - | MΩ |
| Common-Mode Input Impedance | PGA = 1, 2, 4, 8 | 3.5, 3.5, 1.8, 0.9 | - | - | MΩ |
| Data Rate | - | 15, 30, 60, 240 | - | - | SPS |
| Power Supply | - | 2.7 to 5.5 | - | - | V |
| Current Consumption | - | 240 | - | - | µA |
| Onboard Reference Accuracy | - | 2.048V ±0.05% | - | - | V |
| Onboard Reference Drift | - | 5 ppm/°C | - | - | - |
Key Features
- 16-bit resolution with no missing codes
- Continuously self-calibrating delta-sigma A/D converter
- Onboard 2.048V reference with ±0.05% accuracy and 5 ppm/°C drift
- Programmable gain amplifier (PGA) with gains up to 8
- Onboard clock oscillator
- I2C-compatible serial interface with eight selectable addresses
- Support for two differential or three single-ended analog input channels
- Single-cycle conversion and continuous-conversion modes
- Low current consumption: 240 µA
- Operating temperature range: -40°C to +85°C
Applications
- Portable instrumentation
- Industrial process control
- Smart transmitters
- Consumer goods
- Factory automation
- Temperature measurement
Q & A
- What is the resolution of the ADS1112?
The ADS1112 has a resolution of up to 16 bits with no missing codes.
- What is the input range of the ADS1112?
The input range is ±2.048V differentially, depending on the PGA setting.
- What communication interface does the ADS1112 use?
The ADS1112 uses an I2C-compatible serial interface.
- How many analog input channels does the ADS1112 support?
The ADS1112 supports two differential or three single-ended analog input channels.
- What are the power supply requirements for the ADS1112?
The ADS1112 operates from a single power supply ranging from 2.7V to 5.5V.
- What is the current consumption of the ADS1112?
The current consumption is 240 µA.
- Does the ADS1112 have onboard calibration?
Yes, the ADS1112 features continuous self-calibration.
- What are the typical applications of the ADS1112?
Typical applications include portable instrumentation, industrial process control, smart transmitters, consumer goods, factory automation, and temperature measurement.
- Can the ADS1112 operate with an external clock?
No, the ADS1112 cannot operate with an external system clock; it uses an onboard clock oscillator.
- How does the ADS1112 manage power in single-conversion mode?
In single-conversion mode, the ADS1112 powers down after a conversion, reducing current consumption during idle periods.
