Overview
The ADS1234IPW, produced by Texas Instruments, is a precision 24-bit analog-to-digital converter (ADC) designed to provide a complete front-end solution for bridge sensor applications. This includes weigh scales, strain gauges, and pressure sensors. The device features a low-noise programmable gain amplifier (PGA), a precision delta-sigma ADC, and an internal oscillator, making it highly suitable for measuring low signals from bridge sensors.
Key Specifications
| Specification | Value |
|---|---|
| Resolution | 23.5 bits effective at gain = 1, 19.2 bits noise-free at gain = 64 |
| Selectable Gains | 1, 2, 64, and 128 |
| RMS Noise | 17 nV at 10 SPS at gain = 128, 44 nV at 80 SPS at gain = 128 |
| 50-Hz and 60-Hz Rejection | 100 dB simultaneous rejection |
| Clocking Options | Low-drift internal oscillator, optional external crystal |
| Data Rates | Selectable 10 SPS or 80 SPS |
| Input Channels | Four-channel differential input |
| Supply Voltage Range | 2.7 V to 5.3 V |
| Operating Temperature Range | –40°C to +105°C |
| Package Type | TSSOP-28 |
Key Features
- Complete front-end solution for bridge sensors
- Low-noise PGA with selectable gains of 1, 2, 64, and 128
- Flexible clocking options including internal oscillator and external crystal
- Selectable data rates of 10 SPS and 80 SPS
- Easy ratiometric measurements with external voltage reference up to 5 V
- Four-channel differential input
- Two-wire serial interface for data output
- Low-power standby mode and power-down mode
- No digital registers to program; simple pin-driven control
Applications
- Weigh scales
- PLC weight modules
- Strain gauges
- Pressure sensors
Q & A
- What is the primary application of the ADS1234IPW?
The ADS1234IPW is primarily used in bridge sensor applications, including weigh scales, strain gauges, and pressure sensors.
- What is the resolution of the ADS1234IPW?
The ADS1234IPW has a 23.5-bit effective resolution at gain = 1 and a 19.2-bit noise-free resolution at gain = 64.
- What are the selectable gains of the ADS1234IPW?
The selectable gains are 1, 2, 64, and 128.
- What is the RMS noise of the ADS1234IPW at different data rates?
The RMS noise is 17 nV at 10 SPS and 44 nV at 80 SPS, both at gain = 128.
- How does the ADS1234IPW handle 50-Hz and 60-Hz noise rejection?
The device provides 100 dB simultaneous 50-Hz and 60-Hz rejection.
- What are the clocking options for the ADS1234IPW?
The device can be clocked using a low-drift internal oscillator or an optional external crystal.
- What are the data rates supported by the ADS1234IPW?
The device supports selectable data rates of 10 SPS and 80 SPS.
- How many differential input channels does the ADS1234IPW have?
The ADS1234IPW has four-channel differential input.
- What is the supply voltage range of the ADS1234IPW?
The supply voltage range is 2.7 V to 5.3 V.
- What is the operating temperature range of the ADS1234IPW?
The operating temperature range is –40°C to +105°C.
- How is the data output from the ADS1234IPW?
Data is output over a two-wire serial interface.
