Linear LTC2460 16位模数转换方案

Linear公司的 LTC2460/LTC2462是超小型集成了基准电压源的16位模数转换器,单电源2.7V到5.5V电压工作,能通过SPI接口进行通信.内部基准具有10ppm/度C的精度,失调误差2LSB,增益误差0.01%,每秒转换60次.可用于系统监测,环境监测,直接温度测量,仪表,工业过程控制,数据采集等.本文介绍了LTC2460/LTC2462的主要特性,方框图以及典型应用电路和MCU的典型应用电路.

The LTC2460/LTC2462 are ultra tiny, 16-Bit analog-todigital converters with an integrated precision reference.

They use a single 2.7V to 5.5V supply and communicate through an SPI Interface. The LTC2460 is single-ended with a 0V to VREF input range and the LTC2462 is differential with a ±VREF input range. Both ADC’s include a 1.25V integrated reference with 2ppm/℃ drift performance and 0.1% initial accuracy. The converters are available in a 12-pin DFN 3mm 3mm package or an MSOP-12 package. They include an integrated oscillator and perform conversions with no latency for multiplexed applications. The LTC2460/LTC2462 include a proprietary input sampling scheme that reduces the average input current several orders of magnitude when compared to conventional delta sigma converters.

Following a single conversion, the LTC2460/LTC2462 automatically power down the converter and can also be configured to power down the reference. When both the ADC and reference are powered down, the supply current is reduced to 200nA.

The LTC2460/LTC2462 can sample at 60 conversions per second, and due to the very large oversampling ratio, have extremely relaxed antialiasing requirements. Both include continuous internal offset and fullscale calibration algorithms which are transparent to the user, ensuring accuracy over time and the operating temperature range.

LTC2460主要特性:

16-Bit Resolution, No Missing Codes

Internal Reference, High Accuracy 10ppm/℃(Max)

Single-Ended (LTC2460) or Differential (LTC2462)

2LSB Offset Error

0.01% Gain Error

60 Conversions Per Second

Single Conversion Settling Time for Multiplexed Applications

Single-Cycle Operation with Auto Shutdown

1.5mA Supply Current

2μA (Max) Sleep Current

Internal Oscillator—No External Components Required

SPI Interface

Ultra-Tiny 12-Lead 3mm.3mm DFN and MSOP Packages

LTC2460应用:

System Monitoring

Environmental Monitoring

Direct Temperature Measurements

Instrumentation

Industrial Process Control

Data Acquisition

Embedded ADC Upgrades



图1. LTC2460方框图



图2.LTC2460典型应用电路



图3.LTC2460和MCU的典型应用电路