Overview
The ADS1118IDGST is a 16-bit precision analog-to-digital converter (ADC) from Texas Instruments (TI) that integrates a low-noise programmable gain amplifier (PGA), an internal voltage reference, a temperature sensor, and an SPI-compatible serial interface. Operating from a single supply voltage ranging from 2.0V to 5.5V, the device converts analog sensor signals into digital data and connects to a microcontroller or digital system via the SPI interface.
Core parameters
| Parameter | ADS1118IDGST |
| Device type | 16-bit precision ADC |
| ADC architecture | Delta-Sigma |
| resolution | 16 bit |
| Analog input channel | 4-channel single-ended / 2-channel differential |
| PGA | Integrated programmable gain amplifier |
| PGA gain range | 1, 2, 4, 8, 16 |
| Maximum data rate | 860 SPS |
| Operating power supply voltage | 2.0V to 5.5V |
| Data Interface | SPI compatible serial interface |
| Internal reference voltage | integrated |
| Temperature sensor | integrated |
| Operating temperature range | -40°C to +125°C |
| Packaging | VSSOP-10 |
| Encapsulation code | DGST |
Features
1. 16-bit high-resolution Δ-Σ ADC
The ADS1118 uses a Δ-Σ conversion architecture, providing high measurement resolution at relatively low data rates, making it suitable for precise acquisition of slowly changing small signals.
2. Integrated programmable gain amplifier
The ADS1118 has a built-in PGA that can be configured with different input full-scale ranges, including ±6.144V, ±4.096V, ±2.048V, ±1.024V, ±0.512V, and ±0.256V.
When the input signal amplitude is small, a smaller full-scale range can be selected, thereby improving the utilization of the ADC’s effective input range.
3. Supports differential and single-ended inputs.
The ADS1118 offers multiple analog inputs, which can be configured as differential inputs or used for single-ended measurements.
Differential measurement is suitable for sensor outputs, bridge circuits, and analog signals with some common-mode interference. By measuring the voltage between the two input terminals, the influence of some common-mode noise on the measurement results can be reduced.
4. Integrated internal voltage reference
The ADS1118 integrates internal reference voltage correlation circuitry, which can reduce the number of external reference devices and make the peripheral circuitry more compact.
Typical application scenarios
Temperature measurement
The ADS1118 can be used in temperature measurement systems such as thermocouples, RTDs, and thermistors. It can digitize small analog signals using a PGA and a 16-bit ADC.
In designs that require simultaneous monitoring of the ADC chip temperature, its internal temperature sensor can also be used for auxiliary monitoring.
Industrial sensor data acquisition
Pressure sensors, strain sensors, flow sensors, and other low-speed analog sensors typically require high measurement resolution, but not necessarily high sampling rates.
The ADS1118’s 16-bit resolution and configurable data rate make it suitable for this type of data acquisition system.
Portable measuring instruments
The VSSOP small package and wide power supply voltage range allow the ADS1118 to be integrated into portable test equipment, handheld instruments, and battery-powered devices.
Industrial process monitoring
In industrial automation systems, multiple analog input channels can be used to acquire temperature, pressure, current, or other process variables, and digital data can be transmitted to the main controller via SPI.
Comparative Advantage Analysis
| Design Dimensions | ADS1118IDGST Features | Impact on system design |
| resolution | 16 bit | Suitable for precision low-speed analog signal acquisition |
| ADC architecture | Delta-Sigma | Suitable for low-noise, high-resolution measurements |
| PGA | 1–16x configurable | It can adapt to sensor signals of different amplitudes. |
| Input configuration | Single-ended/Differential | Supports multiple sensor interfaces |
| Data rate | Up to 860 SPS | Suitable for low-speed to medium-low-speed data acquisition |
| Digital Interface | SPI compatible | Easy to connect to MCU/DSP |
| Internal functions | PGA, reference, temperature sensor | Reduce peripheral components |
| Power range | 2.0V–5.5V | Compatible with 3.3V, 5V and other systems |
| Packaging | VSSOP-10 | Suitable for compact PCB design |
| Operating temperature | -40°C to +125°C | It can cover industrial environment applications. |
Manufacturer Profile
Texas Instruments (TI) is a semiconductor manufacturer whose products cover analog chips, embedded processors, interface devices, power management devices, and data converters.
The ADS1118 belongs to TI’s precision data converter product family, primarily targeting high-resolution analog signal acquisition. It integrates a PGA, reference voltage, and temperature sensor, enabling it to perform multiple functions from analog input to digital interface in a single device.
Why choose ADS1118IDGST?
The key feature of the ADS1118IDGST is that it integrates a 16-bit Δ-Σ ADC, PGA, analog input multiplexing, internal reference, and temperature sensor into a single device.
For embedded systems that require connection to low-amplitude analog sensors, the PGA range can be selected based on the input signal amplitude, and the conversion result can be transmitted to the main controller via SPI. Compared to solutions consisting of independent ADCs, PGAs, and reference devices, this highly integrated structure reduces the number of peripheral components and lowers PCB design complexity.
Frequently Asked Questions (FAQ)
Q1: What is the ADS1118IDGST device?
The ADS1118IDGST is TI’s 16-bit precision Δ-Σ ADC, integrating a PGA, internal reference, temperature sensor, and SPI-compatible interface.
Q2: How many analog inputs does the ADS1118 support?
The ADS1118 features multiple analog inputs that can be configured for single-ended or differential measurements. The specific input combination is selected by the internal multiplexer.
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