ADS1258 - 24 位快速通道循环 Δ-Σ ADC

ADS1258是TI德州仪器公司的一款精密ADC(<=10MSPS)产品，ADS1258是24 位快速通道循环 Δ-Σ ADC，本站介绍了ADS1258的封装应用图解、特点和优点、功能等，并给出了与ADS1258相关的TI元器件型号供参考。

ADS1258 - 24 位快速通道循环 Δ-Σ ADC - 精密ADC(<=10MSPS) - 模数转换器 - 德州仪器

产品描述

The ADS1258 is a 16-channel (multiplexed), low-noise, 24-bit, delta-sigma () analog-to-digital converter (ADC) that provides single-cycle settled data at channel scan rates from 1.8k to 23.7k samples per second (SPS) per channel. A flexible input multiplexer accepts combinations of eight differential or 16 single-ended inputs with a full-scale differential range of 5V or true bipolar range of ±2.5V when operating with a 5V reference. The fourth-order delta-sigma modulator is followed by a fifth-order sinc digital filter optimized for low-noise performance.

The differential output of the multiplexer is accessible to allow signal conditioning prior to the input of the ADC. Internal system monitor registers provide supply voltage, temperature, reference voltage, gain, and offset data.

An onboard PLL generates the system clock from a 32.768kHz crystal, or can be overridden by an external clock source. A buffered system clock output (15.7MHz) is provided to drive a microcontroller or additional converters.

Serial digital communication is handled via an SPI™-compatible interface. A simple command word structure controls channel configuration, data rates, digital I/O, monitor functions, etc.

Programmable sensor bias current sources can be used to bias sensors or verify sensor integrity.

The ADS1258 operates from a unipolar +5V or bipolar ±2.5V analog supply and a digital supply compatible with interfaces ranging from 2.7V to 5.25V. The ADS1258 is available in a QFN-48 package.

产品特性

24 Bits, No Missing Codes
Fixed-Channel or Automatic Channel Scan
Fixed-Channel Data Rate: 125kSPS
Auto-Scan Data Rate: 23.7kSPS/Channel
Single-Conversion Settled Data
16 Single-Ended or 8 Differential Inputs
Unipolar (+5V) or Bipolar (±2.5V) Operation
Low Noise: 2.8µVRMS at 1.8kSPS
0.0003% Integral Nonlinearity
DC Stability (typical): 0.02µV/°C Offset Drift, 0.4ppm/°C Gain Drift
Open-Sensor Detection
Conversion Control Pin
Multiplexer Output for External Signal Conditioning
On-Chip Temperature, Reference, Offset, Gain, and Supply Voltage Readback
42mW Power Dissipation
Standby, Sleep, and Power-Down Modes
8 General-Purpose Inputs/Outputs (GPIO)
32.768kHz Crystal Oscillator or External Clock
APPLICATIONS
- Medical, Avionics, and Process Control
- Machine and System Monitoring
- Fast Scan Multi-Channel Instrumentation
- Industrial Systems
- Test and Measurement Systems

SPI is a trademark of Motorola, Inc. All other trademarks are the property of their respective owners.

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