ADS1256 - 具有多路复用器的 24 位 30kSPS 极低噪声 Δ-Σ ADC

ADS1256是TI德州仪器公司的一款精密ADC(<=10MSPS)产品，ADS1256是具有多路复用器的 24 位 30kSPS 极低噪声 Δ-Σ ADC，本站介绍了ADS1256的封装应用图解、特点和优点、功能等，并给出了与ADS1256相关的TI元器件型号供参考。

ADS1256 - 具有多路复用器的 24 位 30kSPS 极低噪声 Δ-Σ ADC - 精密ADC(<=10MSPS) - 模数转换器 - 德州仪器

产品描述

The ADS1255 and ADS1256 are extremely low-noise, 24-bit analog-to-digital (A/D) converters. They provide complete high-resolution measurement solutions for the most demanding applications.

The converter is comprised of a 4th-order, delta-sigma (ΔΣ) modulator followed by a programmable digital filter. A flexible input multiplexer handles differential or single-ended signals and includes circuitry to verify the integrity of the external sensor connected to the inputs. The selectable input buffer greatly increases the input impedance and the low-noise programmable gain amplifier (PGA) provides gains from 1 to 64 in binary steps. The programmable filter allows the user to optimize between resolution of up to 23 bits noise-free and data rate of up to 30k samples per second (SPS). The converters offer fast channel cycling for measuring multiplexed inputs and can also perform one-shot conversions that settle in just a single cycle.

Communication is handled over an SPI-compatible serial interface that can operate with a 2-wire connection. Onboard calibration supports both self and system correction of offset and gain errors for all the PGA settings. Bidirectional digital I/Os and a programmable clock output driver are provided for general use. The ADS1255 is packaged in an SSOP-20, and the ADS1256 in an SSOP-28.

产品特性

24 Bits, No Missing Codes
- All Data Rates and PGA Settings
Up to 23 Bits Noise-Free Resolution
±0.0010% Nonlinearity (max)
Data Output Rates to 30kSPS
Fast Channel Cycling
- 18.6 Bits Noise-Free (21.3 Effective Bits) at 1.45kHz
One-Shot Conversions with Single-Cycle Settling
Flexible Input Multiplexer with Sensor Detect
- Four Differential Inputs (ADS1256 only)
- Eight Single-Ended Inputs (ADS1256 only)
Chopper-Stabilized Input Buffer
Low-Noise PGA: 27nV Input-Referred Noise
Self and System Calibration for All PGA Settings
5V Tolerant SPI™-Compatible Serial Interface
Analog Supply: 5V
Digital Supply: 1.8V to 3.6V
Power Dissipation
- As Low as 38mW in Normal Mode
- 0.4mW in Standby Mode

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