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ADS131A04IPBSR

4-ch 24-bit simultaneous ADC, 128kSPS, PGA, 106dB DR, TSSOP-28

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Pieza del fabricante：

ADS131A04IPBSR

Paquete：

TSSOP-28 (4.4 × 9.7 × 1.2 mm)

Marca：

Categorías de productos：

Circuitos integrados lineales analógicos, Circuitos integrados IC

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Descripción

Productos

The ADS131A04IPBSR from Texas Instruments is a 4-channel, 24-bit, simultaneous-sampling delta-sigma ADC designed for precision measurement in power metering, industrial, and medical applications. It features a wide dynamic range, programmable gain amplifier, and SPI interface in a 28-pin TSSOP package.

Especificaciones

Resolution: 24 bits
Channels: 4 simultaneously sampling
Data Rate: Up to 128 kSPS per channel
Dynamic Range: 106 dB at 8 kSPS
PGA: 1, 2, 4, 8, 16, 32 programmable gain
Input Range: ±2.5 V differential (with 2.5 V reference)
Reference: 2.5 V internal, or external
Supply: 3.0 V to 5.5 V analog, 1.65 V to 3.6 V digital
Interface: SPI (up to 20 MHz SCLK)
Operating Temperature: -40°C to +85°C (I grade)
Package: TSSOP-28 (4.4 × 9.7 mm)

Características

Simultaneous 4-channel sampling for phase-aligned measurements
Programmable gain amplifier for wide input dynamic range
Low drift internal reference
On-chip oscillator (no external clock required)
CRC error checking on SPI data
Multiple power-down modes

Aplicaciones

Three-phase power metering
Protective relay systems
Industrial process control
Medical instrumentation
Precision sensor measurement

Introducción del producto:ADS131A04IPBSR Presentación del producto

The ADS131A04IPBSR from Texas Instruments is a 4-channel, 24-bit, simultaneous-sampling delta-sigma ADC optimized for precision measurement applications such as power metering and protective relay systems. Each channel includes a programmable gain amplifier (PGA) with gain settings from 1 to 32, enabling direct connection to a wide range of sensors and transducers. Simultaneous sampling ensures phase-aligned measurements across all four channels, critical for three-phase power metering and power quality analysis. The device achieves 106 dB dynamic range at 8 kSPS data rate with low total harmonic distortion. The integrated 2.5 V reference with low temperature drift eliminates the need for an external precision reference in most applications. An on-chip oscillator simplifies design by removing the external clock requirement, though external clock input is also supported.

Principio de funcionamiento:ADS131A04IPBSR Principio de funcionamiento

The ADS131A04 uses a 3rd-order delta-sigma modulator per channel to convert analog input signals into high-resolution digital data. Each channel’s modulator operates continuously, producing a 1-bit oversampled data stream at the modulator frequency. The integrated digital decimation filter then processes this data to produce 24-bit output words at the programmed output data rate (up to 128 kSPS). The PGA before the modulator amplifies small input signals to utilize the full modulator dynamic range. Simultaneous sampling is achieved by synchronizing all four modulators to the same clock edge, ensuring that all channels sample at exactly the same instant. The SPI interface provides read access to the conversion results and write access to configuration registers. CRC error checking on the SPI data frame ensures data integrity in noisy environments.

Descripción de la clavija:ADS131A04IPBSR Definición y funciones de las clavijas

Pin	Nombre	Descripción
1	AVDD	Analog Supply (3.0-5.5 V)
2	AIN0P	Channel 0 Positive Input
3	AIN0N	Channel 0 Negative Input
4	AIN1P	Channel 1 Positive Input
5	AIN1N	Channel 1 Negative Input
6	AIN2P	Channel 2 Positive Input
7	AIN2N	Channel 2 Negative Input
8	AIN3P	Channel 3 Positive Input
9	AIN3N	Channel 3 Negative Input
10	AGND	Analog Ground
11	REFIN	External Reference Input
12	REFOUT	Internal Reference Output (2.5 V)
13	CLK	External Clock Input
14	CS	SPI Chip Select (Active Low)
15	SCLK	SPI Clock Input
16	DIN	SPI Data Input
17	DOUT/DRDY	SPI Data Output / Data Ready
18-20	CTRL/GPIO	Control and GPIO Pins
21-28	DVDD/DGND	Digital Supply and Ground

Application Scenarios:In which products and applications isADS131A04IPBSR usado

Three-Phase Power Metering: Simultaneous 4-channel sampling (3 voltage + 1 current or 3 current + 1 voltage) with 106 dB dynamic range for Class 0.1 accuracy
Protective Relay: High-speed 128 kSPS fault detection with phase-aligned channel sampling for distance protection
Industrial Process Control: Precision temperature and pressure measurement with PGA gain from 1 to 32
Medical Instrumentation: Multi-channel biopotential measurement with low noise and high resolution
Precision Sensor Interface: Direct connection to Wheatstone bridges and RTD sensors with integrated PGA