The ADS1248IPWR is a 24-bit analog-to-digital converter (ADC) device that includes many integrated features to reduce system cost and component count in sensor measurement applications. It is specifically designed for precision measurement and sensing applications, providing high-resolution and high-precision analog-to-digital conversion. This device is usually used in applications that require high-precision data acquisition, such as sensor signal processing, temperature measurement, pressure measurement, weighing and other fields.

The ADS1248IPWR uses an SPI interface for communication and has multiple low-power modes, making it suitable for portable and wireless sensor systems with strict battery life requirements.

 

Ⅰ.Specifications of ADS1248IPWR

•Height:1 mm
•Length:9.7 mm
•Width:4.4 mm
•Power consumption:2.3 mW
•Number of inputs:4.7
•Number of digits:24
•Number of pins:28
•Series:ADS1248
•Resolution:24 bit
•Package:Reel
•Interface type:SPI
•Sampling ratio:2 kS/s
•Number of channels:8 Channel
•Installation style:SMD/SMT
•Package/Case:TSSOP-28
•Input type:Differential
•Structure:Sigma-Delta
•Minimum operating temperature:-40℃
•Maximum operating temperature:+105℃
•Manufacturer:Texas Instruments
•Product Category:Analog-to-Digital Converter-ADC
•Analog power supply voltage:2.7V to 5.25V
•Digital power supply voltage:2.7V to 5.25V
•Humidity Sensitivity:Yes
•DNL-Differential Nonlinearity:+/-1 LSB
•INL-Integral Nonlinearity:15 ppm
•Converter quantity:1 Converter
•Pd-power dissipation:2.56 mW
•Reference type:External, Internal
•Product type:ADCs-Analog to Digital Converters

 

Ⅱ.Working principle of ADS1248IPWR

1.Input signal conditioning: ADS1248IPWR has a built-in programmable gain amplifier (PGA), which can adjust the gain of the input signal to adapt to different ranges of analog signals. This way, regardless of the amplitude of the input signal, the ADC is able to convert it into a digital code.

2.Δ-Σ conversion technology: ADS1248IPWR uses Δ-Σ (Delta-Sigma) conversion technology to achieve high-precision analog-to-digital conversion. A delta-sigma converter continuously compares the input signal to an internal reference voltage and generates an error signal that represents the difference between the two. This error signal is then integrated and quantized to produce the final digital output. Delta-Sigma conversion technology provides high-resolution, low-noise and low-distortion performance.

3.Digital filter: ADS1248IPWR has a built-in digital filter for filtering the converted digital signal. This helps eliminate noise and interference, improving signal quality and accuracy.

4.Data output: After delta-sigma conversion and digital filtering, the ADS1248IPWR outputs the digital code to an external device or microcontroller. This digital code can represent the magnitude of the input analog signal for subsequent data processing and analysis.

5.Accumulator: The filtered signal is fed into the accumulator. This part accumulates the output digital signals and outputs the result as the output of the Σ-Δ converter.

 

Ⅲ.Absolute Maximum Ratings of ADS1248IPWR

 

Ⅳ.Application scenarios of ADS1248IPWR

1.Sensor signal processing: ADS1248IPWR can be used to interface various types of sensors, such as pressure sensors, temperature sensors, weight sensors, etc. It can accurately measure the analog signal output by the sensor and convert it into a digital signal for monitoring and control systems.

2.Temperature measurement: ADS1248IPWR also integrates a temperature sensor, which can realize temperature measurement. In some applications that require temperature monitoring and control, such as environmental monitoring, energy management, etc., ADS1248IPWR can provide accurate temperature data.

3.Test and measurement equipment: ADS1248IPWR can be used in various test and measurement equipment, such as data acquisition systems, laboratory instruments, etc. It provides high-resolution and high-precision analog-to-digital conversion and can be used to accurately measure a variety of signals and parameters.

•High-resolution and high-precision measurement: The ADS1248IPWR has up to 24-bit resolution and is capable of providing very fine analog-to-digital conversion. This means it is able to capture very small signal changes, which is critical for applications that require high-precision measurements. By using delta-sigma technology and digital filters, the ADS1248IPWR can significantly reduce quantization noise and distortion, ensuring measurement accuracy and reliability.

•Multi-channel data acquisition: The ADS1248IPWR supports up to 8 differential input channels and can process multiple signals in parallel, making it ideal for data acquisition systems that need to monitor multiple signal sources or sensors simultaneously.

•Flexibility and programmability: The ADS1248IPWR provides a wide range of configuration options, including programmable gain amplifier (PGA) gain settings, sample rate control, digital filter selection, etc., which can be configured through the SPI or I2C interface, to adapt to different testing needs.

•Fast response and real-time performance: The ADS1248IPWR has fast conversion speed and low latency, and can capture and convert analog signals in real time, which is critical for test and measurement applications that require fast response.

3.Medical instruments: In medical equipment, accurate data collection is crucial. ADS1248IPWR can be used to measure physiological signals, sensor output and various medical parameters, such as blood pressure, electrocardiogram, blood sugar, etc., to monitor patient health status. .

4.Sensor interface: ADS1248IPWR has a built-in programmable gain amplifier and digital filter, which can amplify and filter the input signal to improve system performance and stability. This makes it ideal for sensor interfaces that can receive and process analog signals from a variety of sensors, such as temperature, pressure, light, etc.

5.Industrial control: In industrial automation and control systems, ADS1248IPWR can be used to monitor and control various process parameters, such as pressure, flow, temperature, etc. It can provide reliable data collection and feedback to help optimize production processes and improve production efficiency. ADS1248IPWR has 8 programmable differential input channels, which can simultaneously collect multiple analog signals to meet the needs of industrial control and automation applications.

6.Precision measurement: The high-precision analog-to-digital conversion capabilities of the ADS1248IPWR make it an ideal choice for precision measurement applications. For example, in the fields of instrumentation, medical equipment and other fields, high-precision data collection and processing are required. ADS1248IPWR can provide stable and reliable measurement results.

 

Ⅴ.Recommended Operating Conditions of ADS1248IPWR

 

Ⅵ.Functional Block Diagram of ADS1248IPWR

 

Ⅶ.Integrated functions of ADS1248IPWR

1.Integrated low-noise preamplifier: ADS1248IPWR has a built-in low-noise preamplifier that amplifies the sensor signal and improves the signal-to-noise ratio, which means the sensor can output weaker signals without the need for an external amplifier, thus reducing the cost and components of the system. quantity.

2.Internal temperature sensor: ADS1248IPWR also integrates an internal temperature sensor, which can be used for temperature compensation or monitoring without the need for additional temperature sensors, further reducing system cost and component count.

3.Internal reference voltage: ADS1248IPWR integrates an internal reference voltage source, eliminating the need for an external reference voltage, reducing the number of external components and the cost of the system.

4.Low power consumption mode: ADS1248IPWR has a variety of low power consumption modes, which can reduce the power consumption of the system, extend battery life, and reduce energy costs and maintenance costs.

5.Multi-channel input: ADS1248IPWR has multiple analog input channels, which can receive signals from multiple sensors at the same time, reducing the need for external switches and multiplexers, thereby reducing the cost and complexity of the system.

6.SPI interface: ADS1248IPWR communicates through SPI (Serial Peripheral Interface). This interface is simple and easy to use, without the need for additional communication interface chips, reducing the cost and complexity of the system.

Ⅷ.The role of the built-in low drift voltage reference of ADS1248IPWR


For any analog-to-digital converter (ADC), an accurate reference voltage is the basis for ensuring measurement accuracy. The built-in low-drift voltage reference provides a stable reference voltage source for reference comparison during the ADC conversion process. This ensures the stability of the reference voltage during the conversion process, helping to improve the accuracy and stability of the ADC. Drift is the shift in a reference voltage over time or temperature. Low drift means the reference voltage remains relatively stable under these conditions, improving measurement accuracy.

Using the built-in low-drift voltage reference reduces external components in the system, such as an external reference voltage source. External components may be affected by factors such as ambient temperature changes, power supply fluctuations, etc., thereby introducing system errors. Built-in low-drift voltage references typically have small temperature drift and long-term drift, which can reduce system errors.

In the ADS1248IPWR, the built-in low-drift voltage reference provides a stable reference point for the ADC, allowing the converter to convert analog signals into digital signals more accurately. This is particularly important for applications that require high-precision measurements, such as medical instrumentation and industrial controls.

Additionally, a low-drift voltage reference helps improve the long-term stability of the device. In some applications that require long-term operation, such as industrial automation and monitoring systems, equipment may be affected by factors such as temperature changes and power supply fluctuations. The built-in low-drift voltage reference can reduce the impact of these factors on the measurement results, ensuring the stability and reliability of the device over long periods of operation.

 

Frequently Asked Questions

1.In which applications is ADS1248IPWR commonly used?
ADS1248IPWR is commonly used in precision measurement and sensor signal processing applications, such as industrial control systems, medical instruments, instrumentation, and sensor data acquisition systems.

2.What is the communication interface used by ADS1248IPWR?
ADS1248IPWR uses a Serial Peripheral Interface (SPI) for communication with microcontrollers or other digital devices.

3.Does ADS1248IPWR provide built-in diagnostics or self-calibration features?
Yes, ADS1248IPWR provides built-in diagnostic features such as open- and short-circuit detection on analog inputs, as well as a self-calibration feature for offset and gain calibration.