Overview
The ADS131B04-Q1, produced by Texas Instruments, is a highly advanced automotive-grade analog-to-digital converter (ADC) designed for precise and reliable data acquisition in various automotive applications. This 24-bit, four-channel, simultaneous-sampling, delta-sigma ADC offers a wide dynamic range, low power consumption, and buffered analog inputs, making it an excellent fit for automotive battery management systems (BMS), high-voltage measurements, and temperature sensing.
The device is AEC-Q100 qualified, ensuring it meets stringent automotive standards, and is functional safety-capable. It operates over a temperature range of –40°C to +125°C, making it suitable for harsh automotive environments.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 24 bits |
| Sample Rate | Up to 32 kSPS |
| Number of Input Channels | 4 |
| Interface Type | SPI |
| Architecture | Delta-Sigma (ΔΣ) |
| Input Type | Differential, Single-ended |
| Multichannel Configuration | Simultaneous Sampling |
| Programmable Gain | Up to 128 |
| Noise Performance | 0.82 µV RMS at 1 kSPS, gain = 8 |
| Crosstalk Between Channels | –120 dB |
| Internal Reference | 1.2 V, low-drift |
| Power Consumption | 5 mW at 3.3-V AVDD and DVDD |
| Analog Supply Voltage | 2.7 V to 3.6 V |
| Digital Supply Voltage | 2.7 V to 3.6 V |
| Operating Temperature Range | –40°C to +125°C |
| Package Type | 20-pin TSSOP |
Key Features
- Simultaneous Sampling: All four channels sample simultaneously, ensuring accurate and synchronized data acquisition.
- Programmable Gain Amplifier (PGA): Provides gains ranging from 1 to 128 to amplify low-level signals.
- Global-Chop Mode: Removes offset drift over temperature and time, enhancing accuracy and stability.
- High-Impedance Analog Inputs: Allows direct connection to sensors without additional buffering.
- Integrated Negative Charge Pump: Enables measurement of input signals below ground.
- Low-Drift Internal Reference: A 1.2 V reference with minimal drift ensures consistent performance.
- Precision Internal Oscillator: Reduces the need for external components and minimizes PCB area.
- Cyclic Redundancy Checks (CRCs): Ensures communication integrity by checking data input, output, and register map.
- Low Power Consumption: Operates at 5 mW at 3.3-V AVDD and DVDD, making it energy-efficient.
Applications
- Automotive Battery Management Systems (BMS): Ideal for bidirectional battery-current measurements and high-voltage monitoring.
- Temperature Sensing: Can be interfaced with thermistors or analog output temperature sensors.
- High-Voltage Measurements: Compatible with resistor-divider networks for precise voltage monitoring.
- Industrial and Commercial Environments: Suitable for various applications requiring high accuracy and reliability in harsh environments.
Q & A
- What is the resolution of the ADS131B04-Q1 ADC?
The ADS131B04-Q1 has a resolution of 24 bits.
- How many input channels does the ADS131B04-Q1 have?
The device has four simultaneous-sampling input channels.
- What is the maximum sample rate of the ADS131B04-Q1?
The maximum sample rate is up to 32 kSPS.
- What type of interface does the ADS131B04-Q1 use?
The device uses an SPI interface.
- What is the operating temperature range of the ADS131B04-Q1?
The operating temperature range is –40°C to +125°C.
- Is the ADS131B04-Q1 AEC-Q100 qualified?
Yes, the ADS131B04-Q1 is AEC-Q100 qualified for automotive applications.
- What is the power consumption of the ADS131B04-Q1?
The power consumption is approximately 5 mW at 3.3-V AVDD and DVDD.
- Does the ADS131B04-Q1 have integrated calibration features?
Yes, it includes offset and gain calibration registers to remove signal-chain errors.
- What is the crosstalk between channels in the ADS131B04-Q1?
The crosstalk between channels is –120 dB.
- Does the ADS131B04-Q1 support cyclic redundancy checks (CRCs)?
Yes, it supports CRCs on data input, output, and register map for communication integrity.
