Overview
The ADS1130IPWR, produced by Texas Instruments, is a precision 18-bit analog-to-digital converter (ADC) designed specifically for bridge sensor applications. It integrates a low-noise amplifier, an internal oscillator, a third-order delta-sigma modulator, and a fourth-order digital filter. This ADC provides a complete front-end solution for applications such as weigh scales, strain gauges, and pressure sensors. The device supports two data rates: 10 samples per second (SPS) for excellent 50Hz and 60Hz rejection, and 80 SPS for higher speed requirements. All digital control is managed through dedicated pins, eliminating the need for digital registers to program. Data are output via a simple two-wire serial interface, making it easy to connect to microcontrollers like the MSP430.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Resolution | No missing codes | 18 | Bits | ||
| Data Rate | SPEED = low | 10 | SPS | ||
| Data Rate | SPEED = high | 80 | SPS | ||
| Full-scale input voltage (AINP – AINN) | ±0.5VREF/64 | V | |||
| Common-mode input range | AGND + 1.5V | AVDD – 1.5V | V | ||
| Differential input current | ±2 | nA | |||
| Integral nonlinearity (INL) | Differential input, end-point fit | ±20 | ppm of FSR | ||
| Input offset error | ±120 | ppm of FSR | |||
| Input offset drift | ±10 | nV/°C | |||
| Gain error | ±1% | ||||
| Power dissipation, total | Normal mode, AVDD = DVDD = 5V | 5.0 | mW | ||
| Power dissipation, total | Standby mode, AVDD = DVDD = 5V | 0.3 | mW | ||
| Operating temperature range | –40 | +85 | °C |
Key Features
- Onboard Gain of 64: The low-noise amplifier provides a gain of 64, supporting a full-scale differential input of ±39mV.
- Onboard Oscillator: An internal oscillator simplifies the design and reduces external component requirements.
- Selectable Data Rates: Supports data rates of 10 SPS and 80 SPS, with excellent 50Hz and 60Hz rejection at 10 SPS.
- External Voltage Reference: Allows for ratiometric measurements with an external voltage reference up to 5V.
- Simple, Pin-Driven Control: All digital control is managed through dedicated pins, eliminating the need for programming digital registers.
- Two-Wire Serial Digital Interface: Data are output over a simple two-wire serial interface, facilitating connection to microcontrollers.
- Tiny TSSOP-16 Package: Compact packaging suitable for space-constrained applications.
- Low-Power Standby Mode: Reduces power consumption to 0.3 mW in standby mode.
Applications
- Weigh Scales: Ideal for precision weight measurement applications.
- Strain Gauges: Suitable for measuring strain in various mechanical structures.
- Pressure Sensors: Can be used in pressure measurement applications requiring high precision.
Q & A
- What is the resolution of the ADS1130?
The ADS1130 has an 18-bit effective resolution.
- What are the supported data rates for the ADS1130?
The ADS1130 supports data rates of 10 SPS and 80 SPS.
- What is the gain of the onboard amplifier?
The onboard amplifier has a gain of 64.
- How is the data output from the ADS1130?
Data are output over a two-wire serial interface in binary two’s complement format.
- What is the operating temperature range of the ADS1130?
The operating temperature range is from –40°C to +85°C.
- How does the power-down mode work?
Power-down mode is activated by holding the PDWN pin low, which shuts down the entire ADC circuitry and reduces power consumption close to zero.
- What type of package is the ADS1130 available in?
The ADS1130 is available in a TSSOP-16 package.
- What is the supply voltage range for the ADS1130?
The supply voltage range is from 2.7V to 5.3V.
- How is the serial clock input (SCLK) used?
The SCLK input shifts serial data out with each rising edge and is used to initiate Sleep mode.
- What is the purpose of the DRDY/DOUT pin?
The DRDY/DOUT pin indicates when data are ready and outputs the data, MSB first, on the first rising edge of SCLK.
