Overview
The ADS1234IPWG4 is a precision, 24-bit, analog-to-digital converter (ADC) produced by Texas Instruments. This device is part of the ADS123x series, which includes the ADS1232 and ADS1234 models. The ADS1234 is specifically designed for applications requiring high accuracy and low noise, particularly in measuring signals from bridge sensors such as those used in weigh scales, strain gauges, and pressure sensors.
The ADS1234 features a low-noise programmable gain amplifier (PGA), a precision delta-sigma ADC, and an internal oscillator, making it a comprehensive front-end solution for bridge sensor applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 24 bits | |
| Effective Resolution at Gain = 1 | 23.5 bits | |
| Noise-Free Resolution at Gain = 64 | 19.2 bits | |
| Selectable Gains | 1, 2, 64, 128 | |
| RMS Noise at 10 SPS, Gain = 128 | 17 nV | |
| RMS Noise at 80 SPS, Gain = 128 | 44 nV | |
| 50-Hz and 60-Hz Rejection | 100 dB (internal oscillator), 120 dB (external oscillator) | |
| Data Rates | 10 SPS or 80 SPS | |
| Supply Voltage Range | 2.7 V to 5.3 V | V |
| Operating Temperature Range | –40°C to +105°C | °C |
| Package Type | TSSOP-28 | |
| Package Dimensions | 9.70 mm × 4.40 mm | mm |
Key Features
- Complete front-end for bridge sensors with a low-noise PGA and precision delta-sigma ADC.
- Selectable gains of 1, 2, 64, and 128.
- High resolution and low noise: 23.5 bits effective resolution at gain = 1 and 19.2 bits noise-free resolution at gain = 64.
- Flexible clocking options: low-drift internal oscillator or optional external crystal.
- Selectable data rates of 10 SPS or 80 SPS.
- Excellent 50-Hz and 60-Hz rejection.
- Easy ratiometric measurements with an external voltage reference up to 5 V.
- Four-channel differential input (ADS1234 model).
- Two-wire serial interface for data retrieval.
- Wide operating temperature range: –40°C to +105°C.
Applications
- Weigh scales: Ideal for high-precision weight measurements.
- PLC weight modules: Suitable for industrial control systems requiring accurate weight data.
- Pressure sensors: Used in various applications where precise pressure measurements are necessary.
- Strain gauges: For measuring strain in materials under stress.
Q & A
- What is the resolution of the ADS1234 ADC?
The ADS1234 has a 24-bit resolution.
- What are the selectable gains of the ADS1234?
The ADS1234 has selectable gains of 1, 2, 64, and 128.
- What are the data rates available for the ADS1234?
The data rates available are 10 SPS and 80 SPS.
- What is the operating temperature range of the ADS1234?
The operating temperature range is –40°C to +105°C.
- What type of package does the ADS1234 come in?
The ADS1234 comes in a TSSOP-28 package.
- Does the ADS1234 support external clocking?
- What is the supply voltage range for the ADS1234?
The supply voltage range is 2.7 V to 5.3 V.
- How many channels does the ADS1234 have?
The ADS1234 has four-channel differential input.
- What is the noise performance of the ADS1234 at gain = 128?
The RMS noise at 10 SPS and gain = 128 is 17 nV, and at 80 SPS it is 44 nV.
- What is the 50-Hz and 60-Hz rejection capability of the ADS1234?
The ADS1234 has a 100 dB rejection for 50-Hz and 60-Hz noise using the internal oscillator, and up to 120 dB using an external oscillator.
