Overview
The ADS1112IDGSR is a precision, continuously self-calibrating Analog-to-Digital (A/D) converter produced by Texas Instruments. It features two differential or three single-ended channels with up to 16 bits of resolution. The device is packaged in a small MSOP-10 and leadless QFN-style (small-outline, no lead) packages, making it ideal for applications where space and power consumption are critical.
The ADS1112 uses an I2C-compatible serial interface with two address pins, allowing the selection of one of eight I2C Slave addresses. It operates from a single power supply ranging from 2.7V to 5.5V and can perform conversions at rates of 15, 30, 60, or 240 samples per second (SPS).
The onboard 2.048V reference provides an input range of ±2.048V differentially, and the device includes an onboard programmable gain amplifier (PGA) with gains of up to eight. This allows smaller signals to be measured with high resolution. In single-conversion mode, the ADS1112 automatically powers down after a conversion, significantly reducing current consumption during idle periods.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | Up to 16 bits | - |
| Input Channels | Two differential or three single-ended | - |
| Input Range | ±2.048V (differentially) | V |
| Onboard Reference | 2.048V ±0.05% | V |
| Reference Drift | 5 ppm/°C | - |
| PGA Gains | Up to 8 | - |
| Data Rate | 15, 30, 60, or 240 SPS | SPS |
| Power Supply | 2.7V to 5.5V | V |
| Current Consumption | 240 µA | µA |
| Operating Temperature Range | -40°C to 85°C | °C |
| Package Type | MSOP-10, QFN-style | - |
Key Features
- Complete data acquisition system in a small MSOP-10 and leadless QFN-style packages.
- Measurements from two differential channels or three single-ended channels.
- I2C interface with eight addresses pin-selectable.
- Onboard 2.048V reference with accuracy of ±0.05% and drift of 5 ppm/°C.
- Onboard programmable gain amplifier (PGA) with gains up to eight.
- Onboard oscillator.
- 16-bit resolution with no missing codes.
- Integral Non-Linearity (INL): 0.01% of Full-Scale Range (FSR) max.
- Continuous self-calibration.
- Single-cycle conversion.
- Programmable data rate: 15 SPS to 240 SPS.
- Low current consumption: 240 µA.
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.
- How many input channels does the ADS1112 support?
The ADS1112 supports two differential or three single-ended channels.
- What is the input range of the ADS1112?
The input range is ±2.048V differentially.
- What is the accuracy of the onboard reference?
The onboard reference has an accuracy of 2.048V ±0.05%.
- What are the available gains of the onboard PGA?
The onboard PGA offers gains of up to eight.
- What are the supported data rates for the ADS1112?
The ADS1112 supports data rates of 15, 30, 60, or 240 samples per second (SPS).
- What is the power supply range for the ADS1112?
The power supply range is from 2.7V to 5.5V.
- How much current does the ADS1112 consume?
The current consumption is 240 µA.
- What is the operating temperature range of the ADS1112?
The operating temperature range is -40°C to 85°C.
- In what packages is the ADS1112 available?
The ADS1112 is available in MSOP-10 and leadless QFN-style packages.
