Overview
The ADS7871IDBR, produced by Texas Instruments, is a comprehensive low-power data acquisition system integrated into a single chip. It combines a 4-channel differential or 8-channel single-ended multiplexer, a precision programmable gain amplifier (PGA), a 14-bit successive approximation analog-to-digital (A/D) converter, and a precision voltage reference. This device is designed to provide high input impedance, excellent gain accuracy, good common-mode rejection, and low noise, making it suitable for various low-level signal applications without the need for external amplification or impedance buffering.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 14 Bits | |
| PGA Gains | 1, 2, 4, 5, 8, 10, 16, 20 V/V | |
| Input Channels | Up to 4-channel differential or up to 8-channel single-ended | |
| Internal Reference | 1.15 V, 2.048 V, or 2.5 V | |
| Serial Interface | SPI/DSP Compatible, ≤20 MHz | |
| Throughput Rate | 48 kSamples/sec | |
| Supply Voltage | 2.7 V to 5.5 V | V |
| Operating Temperature Range | −40°C to +85°C | °C |
| Package | SSOP-28 |
Key Features
- Programmable gain amplifier with gains of 1, 2, 4, 5, 8, 10, 16, and 20 V/V.
- Internal reference with high initial accuracy and stability vs temperature (drift typically 10 ppm/°C).
- SPI/DSP compatible serial interface supporting up to 20 MHz.
- Low power consumption with a single supply operation from 2.7 V to 5.5 V.
- Four lines of digital input/output (I/O) via the serial interface.
- Error overload indicator and programmable output in 2's complement or binary format.
- Pin-compatible with the ADS7870, with the exception of a few specific pin functions.
Applications
- Portable battery-powered systems.
- Low-power instrumentation.
- Low-power control systems.
- Smart sensor applications.
Q & A
- What is the resolution of the ADS7871 A/D converter?
The ADS7871 has a 14-bit successive approximation analog-to-digital (A/D) converter.
- What are the available PGA gains for the ADS7871?
The PGA gains available are 1, 2, 4, 5, 8, 10, 16, and 20 V/V.
- What is the throughput rate of the ADS7871?
The throughput rate is 48 kSamples/sec.
- What are the operating voltage and temperature ranges for the ADS7871?
The operating voltage range is 2.7 V to 5.5 V, and the operating temperature range is −40°C to +85°C.
- Does the ADS7871 have an internal reference, and if so, what are its characteristics?
Yes, the ADS7871 has an internal reference available in 1.15 V, 2.048 V, or 2.5 V options, with high initial accuracy and stability vs temperature (drift typically 10 ppm/°C).
- What type of serial interface does the ADS7871 support?
The ADS7871 supports an SPI/DSP compatible serial interface up to 20 MHz.
- How many digital I/O lines does the ADS7871 provide?
The ADS7871 provides four lines of digital input/output (I/O) via the serial interface.
- Is the ADS7871 pin-compatible with any other model?
Yes, the ADS7871 is pin-compatible with the ADS7870, with a few specific exceptions.
- What are some typical applications for the ADS7871?
Typical applications include portable battery-powered systems, low-power instrumentation, low-power control systems, and smart sensor applications.
- What is the package type for the ADS7871IDBR?
The package type is SSOP-28.
