TI ADS117L11: 16位高精度Delta-Sigma ADC技术规格

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"TI-ADS117L11 是一款高性能、低功耗的16位Delta-Sigma型模数转换器(ADC)，适用于多种应用领域，包括测试与测量、工厂自动化、医疗设备和电网基础设施等。它具有可编程的数据速率、选择性的数字滤波器、出色的动态范围和精度，以及电源可扩展架构，能够在高速和低速模式下工作，以适应不同的系统需求。" TI的ADS117L11是一款高精度模拟到数字转换器，其核心特性包括： 1. 可编程数据速率：该ADC提供了两种工作模式，支持最高达400kSPS（宽带滤波器）和1.067MSPS（低延迟滤波器）的数据采样率，可以根据应用需求灵活调整。 2. 数字滤波器选择：用户可以选择宽带或低延迟滤波器，宽带来提供更广的频率响应，而低延迟则有利于实时性要求高的应用。 3. 高精度表现：在200kSPS工作时，动态范围达到97.2dB，总谐波失真(THD)低至-110dB，积分非线性(INL)仅为5ppm满量程，确保了卓越的直流精度。同时，偏移漂移仅为50nV/°C，增益漂移为0.6ppm/°C，这些都表明了其在温度变化下的稳定性。 4. 电源可扩展架构：ADS117L11设计有高能效模式（400kSPS，18.6mW）和低功耗模式（50kSPS，3.3mW），能够在保持性能的同时，适应不同功率预算的系统。 5. 输入和参考预充缓冲器：这些功能有助于稳定信号输入和参考电压，提升转换精度。 6. 内部或外部时钟：用户可以根据系统需求选择内部或外部时钟源，增强了系统的灵活性。 7. 应用广泛：这款ADC被广泛应用于数据采集系统、冲击和振动仪器、声学和动态应变仪、模拟输入模块、脉搏血氧仪以及电力质量分析器等领域。总结来说，TI的ADS117L11是需要高分辨率、高精度和低功耗的系统中的理想选择，它的多功能性和卓越性能使其成为许多工业和医疗应用的关键组件。

ADS117L11 400-kSPS, Wide-Bandwidth, 16-Bit, Delta-Sigma ADC

1 Features

• Programmable data rate:

– Up to 400 kSPS (wideband filter)

– Up to 1.067 MSPS (low-latency filter)

• Selectable digital filter:

– Wideband or low-latency

• AC accuracy with dc precision:

– Dynamic range: 97.2 dB (200 kSPS)

– THD: –110 dB

– INL: 5 ppm of FS

– Offset drift: 50 nV/°C

– Gain drift: 0.6 ppm/°C

• Power-scalable architecture:

– High-speed mode: 400 kSPS, 18.6 mW

– Low-speed mode: 50 kSPS, 3.3 mW

• Input and reference precharge buffers

• Internal or external clock

2 Applications

• Test and measurement:

– Data acquisition (DAQ)

– Shock and vibration instruments

– Acoustics and dynamic strain gauges

• Factory automation and control:

– Analog input modules

• Medical:

– Pulse oximetry

• Grid infrastructure:

– Power quality analyzer

3 Description

The ADS117L11 is a 16-bit, delta-sigma (ΔΣ), analog-

to-digital converter (ADC) with data rates up to

400 kSPS using the wideband filter and up to

1067 kSPS using the low-latency filter. The device

offers an excellent combination of ac performance

and dc precision with low power consumption

(18.6 mW in high-speed mode).

The device integrates input and reference buffers

to reduce signal loading. The low-drift modulator

achieves excellent dc precision with low in-band noise

for outstanding ac performance. The power-scalable

architecture provides two speed modes to optimize

data rate, resolution, and power consumption.

The digital filter is configurable for wideband or low-

latency operation, allowing wideband ac performance

or data throughput for dc signals to be optimized, all in

one device.

The serial interface features daisy-chain capability to

reduce the SPI I/O over an isolation barrier. Input and

output data and register settings are validated by a

cyclic-redundancy check (CRC) feature to enhance

operational reliability.

The small 3-mm × 3-mm WQFN package is designed

for limited space applications. The device is fully

specified for operation over the –40°C to +125°C

temperature range.

Device Information

(1)

PART NUMBER PACKAGE BODY SIZE (NOM)

ADS117L11 WQFN (20) 3.00 mm × 3.00 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

AINP

AINN

SCLK

AVDD2

SDO/DRDY

SDI

DRDY

DGND

REFP

REFN

IOVDD

CLK

AVDD1

Mux

START

SPI

Interface

VCM

ADS117L11

AVSS

RESET

Osc



Modulator

Low-latency

Filter

Wideband

Filter

Control

Logic

÷ 2

Simplified Block Diagram

ADVANCE INFORMATION

ADS117L11

SBASAK5 – MARCH 2022

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. ADVANCE INFORMATION for preproduction products; subject to change

without notice.

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do i=int(TEPX+0.5),int(TEPJ+0.5) l1=l1+(i-0.5*(tepx+tepj))*log(-1.0*dats(i)) l2=l2+(i-0.5*(tepx+tepj))**2 l12=l12+log(-1.0*dats(i)) end do l11=l1/l2 l12=l12/(1-tepx+tepj)-l11*0.5*(tepx+tepj)

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do i=int(TEPX+0.5),int(TEPJ+0.5) l1=l1+(i-0.5(tepx+tepj))log(-1.0dats(i)) l2=l2+(i-0.5(tepx+tepj))**2 l12=l12+log(-1.0dats(i)) end do l11=l1/l2 l12=l12/(1-tepx+tepj)-l110.5*(tepx+tepj)