ADS1118QDGSRQ1 IC

Technical Specifications of ADS1118QDGSRQ1

Datasheet	ADS1118QDGSRQ1 datasheet
Category	Integrated Circuits (ICs)
Family	Data Acquisition – Analog to Digital Converters (ADC)
Manufacturer	Texas Instruments
Series	–
Packaging	Tape & Reel (TR)
Part Status	Active
Number of Bits	16
Sampling Rate (Per Second)	860
Number of Inputs	2, 4
Input Type	Differential, Single Ended
Data Interface	SPI
Configuration	MUX-PGA-ADC
Ratio – S/H:ADC	–
Number of A/D Converters	1
Architecture	Sigma-Delta
Reference Type	Internal
Voltage – Supply, Analog	2 V ~ 5.5 V
Voltage – Supply, Digital	2 V ~ 5.5 V
Features	PGA, Temperature Sensor
Operating Temperature	-40°C ~ 125°C
Package / Case	10-TFSOP, 10-MSOP (0.118″, 3.00mm Width)
Supplier Device Package	10-VSSOP

ADS1118QDGSRQ1 Description

The ADS1118-Q1 is a precision analog-to-digital converter (ADC) that consumes low power and has 16 bits of resolution. It has all the features required to measure the most common sensors’ signals. The ADS1118-Q1 incorporates a programmable gain amplifier (PGA), a voltage reference, an oscillator, and a high-accuracy temperature sensor into a single package. The ADS1118-Q1 is ideally suited for power- and space-constrained sensor measurement applications thanks to its features, which include a wide power supply range ranging from 2 V to 5.5 V.

The ADS1118-Q1 can carry out conversions at data rates of up to 860 samples per second (SPS). Because the PGA’s input ranges range from 256 mV to 6.144 V, it can measure signals of varying sizes with high precision, including both large and small ones. Measurement can be performed on either two differential or four single-ended inputs thanks to an input multiplexer, also known as a mux. Monitoring the temperature at the system level or providing cold-junction compensation for thermocouples are two of the applications for the high-accuracy temperature sensor. The ADS1118-Q1 can operate in either single-shot or continuous conversion modes. In the single-shot mode, the device automatically powers down after completing a conversion. Activating single-shot mode results in a marked reduction in the amount of current consumed during periods of inactivity. A serial peripheral interface (also known as SPITM) is utilized throughout the data transfer process. The operating temperature range for the ADS1118-Q1 is -40 degrees Celsius to 125 degrees Celsius.

ADS1118QDGSRQ1 Features

• Single-cycle settling
• Internal low-drift voltage reference
• Internal temperature sensor: 2°C (maximum) error
• Internal oscillator
• Internal PGA
• Four single-ended or two differential inputs Applications
• Battery management systems

Parameter Measurement Information Noise Performance

The delta-sigma () ADC architecture uses oversampling to convert analog signals to digital ones. High-frequency (modulator-frequency) input signal sampling is followed by digital filtering and decimation to get the desired conversion result at the desired output data rate in an ADC. The oversampling ratio is the modulator frequency ratio to the output data rate (OSR). Improving the ADC’s noise performance is achieved by increasing the OSR and decreasing the output data rate. In other words, when the output data rate is slowed, more samples from the internal modulator are averaged into a single conversion result, resulting in a lower level of input-referred noise. Particularly helpful when measuring weak signals, increasing the gain also lowers the input-referred noise.

Detailed Description

Overview

Compact and low-power, the ADS1118-Q1 is a 16-bit delta-sigma () analog-to-digital converter (ADC). The ADS1118-Q1 has an internal voltage reference, a clock oscillator, an SPI, and an ADC core with programmable gain. In addition to being a precise and linear timer, this gadget can also measure temperatures. The goal of incorporating these enhancements is to reduce the amount of extraneous circuitry needed without sacrificing performance.

By subtracting V(AINP) from V, the ADS1118-Q1 ADC core obtains a differential signal, VIN (AINN). The heart of the converter is a digital filter followed by a differential switched-capacitor modulator. The common-mode signal strength is drastically reduced due to the structure’s design. The input signals are compared to the internal voltage standard.

The modulator sends a rapid bitstream to the digital filter, generating a code proportional to the input voltage. The ADS1118-Q1 can either perform a one-time conversion or a continual conversion. If the ADC is set to “single-shot” mode, it will only convert the input signal once when asked, saving the result in its conversion register.

After that, the gadget goes into a power-saving hibernation mode. This change saves energy in systems that need conversions infrequently or has extended periods of inactivity between mutations. When the ADC is set to continuous-conversion mode, it will immediately begin processing the input signal after the last modification. In other words, the data rate that can be converted continuously is the same as the one set in the program. The most current conversion is always reflected in the data that can be read at any moment.

● Analog Inputs

The ADS1118-Q1 is a 16-bit delta-sigma () ADC that is small and energy efficient (ADC). The ADS1118-Q1 includes a programmable-gain ADC core, a serial peripheral interface (SPI), a clock oscillator, and an inbuilt voltage reference. This instrument measures temperatures in addition to being a linear and accurate timer. All of these advancements are being implemented to reduce the amount of unnecessary circuitry without compromising performance.

The ADS1118-Q1 ADC core creates a differential signal, VIN, by subtracting V(AINP) from V. (AINN). A digital filter and a differential switched-capacitor modulator make up the converter’s central processing unit and output stage. Because of how the building is made, the intensity of the common-mode signal is greatly diminished. The signs are compared to a voltage standard within the device.

Digital filter receives fast bitstream from modulator; outputs code proportional to the input voltage. The ADS1118-Q1 has two conversion modes: one-time and continuous. In “single-shot” mode, the ADC will perform the conversion on the input signal only once when instructed to do so and then store the result in its conversion register.

Afterward, the device enters a sleep state to conserve energy. This adjustment can save a significant amount of energy in systems that only need conversions occasionally or have long periods of inactivity between conversions. In continuous-conversion mode, the ADC will start processing the input signal after completing the last modification. In other words, the program’s specified data conversion rate is the maximum pace at which data can be transformed continuously. The data that can be accessed anytime represents the most recent conversion available.

● Full-Scale Range (FSR) and LSB Size

To modify the input signal to the ADS1118-Q1 ADC, a programmable gain amplifier (PGA) is used as a preamplifier. Bits PGA[2:0] in the Config register determine whether the full-scale range is 6.144 V, 4.096 V, 2.048 V, 1.024 V, 0.512 V, or 0.256 V.

● Voltage Reference

One convenient feature of the ADS1118-Q1 is its built-in voltage reference. Using an external standard is not possible with this gadget. The gain error and gain drift requirements in the Electrical Characteristics account for errors caused by the initial voltage reference accuracy and the reference drift with temperature.

● Oscillator

There is a 1 MHz oscillator built right into the ADS1118-Q1. The device can be used without an additional clock. It’s important to remember that the internal oscillator will drift as a function of both time and temperature. As the oscillator frequency increases, the data rate at which it is output increases correspondingly.

● Temperature Sensor

An accurate temperature sensor is included right in the ADS1118-Q1. The temperature sensor mode is activated by setting bit TS MODE = 1 in the Config register. The 14-bit result of the temperature conversion is left-justified within the 16-bit final result. Information is printed beginning with the highest-order byte (MSB). When decoding the two bytes of data, the first 14 bits will show the outcome of the temperature measurement. A 14-bit LSB is equivalent to 0.03125 degrees Celsius.

Conclusion

A single supply, VDD, can power its analog and digital circuitry. The power-up reset process requires a brief delay of about 50 s after VDD has stabilized before the device can be communicated.

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