Overview
The ADS1217IPFBTG4, produced by Texas Instruments, is a precision, wide dynamic range, delta-sigma Analog-to-Digital (A/D) converter. This 8-channel, 24-bit A/D converter operates from 2.7V to 5.25V power supplies, offering high-resolution measurement capabilities. It features a programmable gain amplifier (PGA) with selectable gains from 1 to 128, an on-chip 1.25V/2.5V reference, and on-chip calibration. The device is designed for high-resolution measurement applications in various fields, including smart transmitters and industrial automation.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Resolution | - | - | - | 24 Bits | - |
| Integral Nonlinearity (INL) | - | 0.0003 | - | 0.0012 | % of FSR |
| Full-Scale Input Voltage | PGA = 1 | - | - | ±2VREF | V |
| Programmable Gain Amplifier (PGA) | - | 1 | - | 128 | - |
| Power Supply Voltage | - | 2.7 | - | 5.25 | V |
| Power Consumption | VDD = 3V, PGA = 1, Buffer OFF | 1.8 | - | 2.8 | mW |
| Operating Temperature Range | - | -40 | - | 85 | °C |
| On-Chip Reference Voltage | - | 1.25 | 2.5 | - | V |
Key Features
- High Resolution: 24-bit resolution with no missing codes, providing up to 22 bits of effective resolution at PGA = 1 and 19 bits at PGA = 128.
- Programmable Gain Amplifier (PGA): Selectable gains from 1 to 128, enhancing the effective resolution for various input ranges.
- On-Chip Reference and Calibration: Integrated 1.25V/2.5V reference and on-chip calibration for improved accuracy.
- Input Buffering: High input impedance for direct connection to transducers or low-level voltage signals, with optional buffering to reduce input voltage range.
- Burnout Current Sources: Detection of open or shorted sensors with 2µA current sources.
- Offset DAC: 8-bit DAC for offset correction with a range of 50% of the full-scale range.
- IDACs: Two 8-bit current output DACs for independent control, with compliance voltage range from AGND to within 1V of AVDD.
- SPI Compatible Interface: Serial interface for data communication, along with eight bits of digital I/O.
Applications
- Smart Transmitters: High-resolution measurement applications in smart transmitters and industrial automation.
- Industrial Automation: Precision measurement in various industrial automation systems.
- Medical Devices: High-accuracy measurements required in medical devices and equipment.
- Test and Measurement Equipment: Precision data acquisition in test and measurement instruments.
Q & A
- What is the resolution of the ADS1217IPFBTG4?
The ADS1217IPFBTG4 has a 24-bit resolution with no missing codes, providing up to 22 bits of effective resolution at PGA = 1 and 19 bits at PGA = 128.
- What are the selectable gain ranges of the PGA?
The PGA can be set to gains of 1, 2, 4, 8, 16, 32, 64, or 128.
- What is the operating voltage range of the ADS1217IPFBTG4?
The device operates from 2.7V to 5.25V power supplies.
- Does the ADS1217IPFBTG4 have on-chip calibration and reference?
Yes, it features an on-chip 1.25V/2.5V reference and on-chip calibration.
- How does the input buffering work on the ADS1217IPFBTG4?
The input buffering can be enabled to provide a very high input impedance, suitable for direct connection to transducers or low-level voltage signals.
- What is the purpose of the burnout current sources?
The burnout current sources allow for the detection of an open or shorted sensor by sourcing or sinking approximately 2µA of current.
- What are the key features of the offset DAC in the ADS1217IPFBTG4?
The offset DAC is an 8-bit DAC with a range of 50% of the full-scale range, used for offset correction.
- How do the IDACs function in the ADS1217IPFBTG4?
The device has two 8-bit current output DACs that can be controlled independently, with the output current set by an external resistor and the compliance voltage range from AGND to within 1V of AVDD.
- What type of interface does the ADS1217IPFBTG4 use for data communication?
The device uses an SPI compatible serial interface for data communication, along with eight bits of digital I/O.
- What are some typical applications of the ADS1217IPFBTG4?
Typical applications include smart transmitters, industrial automation, medical devices, and test and measurement equipment.
