ADS1247IPW集成电路（IC）的模数转换器（ADC）规格书PDF中文资料

ADS1247IPW属于集成电路（IC）的模数转换器（ADC）。由德州仪器制造生产的ADS1247IPW模数转换器（ADC）模数转换器（ADC、A/D 或 A 转 D）对模拟信号进行采样，例如由麦克风采集的声音或传感器的输出，然后将其转换为数字信号。一般来说，数字输出是二进制补码二进制数，与输入成比例。输入类型可能是差分、伪差分或单端输入。模数转换器可按照位数、采样率、输入数、接口、转换器数和架构（例如自适应增量、双斜率、折叠、流水线、SAR、三角积分、两步式）进行选择。

1 Features

1• Programmable Data Rates Up to 2 kSPS

• Single-Cycle Settling for All Data Rates

• Simultaneous 50-Hz and 60-Hz Rejection at 20

SPS

• Analog Multiplexer With 8 (ADS1248) and 4

(ADS1247) Independently Selectable Inputs

• Low-Noise PGA: 48 nVRMS at PGA = 128

• Dual-Matched Programmable Excitation Current

Sources

• Low-Drift Internal 2.048-V Reference:

10 ppm/°C (Maximum)

• Sensor Burn-Out Detection

• 4 or 8 General-Purpose I/Os (ADS1247,

ADS1248)

• Internal Temperature Sensor

• Power Supply and VREF Monitoring (ADS1247,

ADS1248)

• Self and System Calibration

• SPI™-Compatible Serial Interface

• Analog Supply: Unipolar (2.7 V to 5.25 V) and

Bipolar (±2.5 V) Operation

• Digital Supply: 2.7 V to 5.25 V

2 Applications

• Temperature Sensor Measurements:

– RTDs, Thermocouples, and Thermistors

• Pressure Measurements

• Flow Meters

• Factory Automation and Process Controls

3 Description

The ADS1246, ADS1247, and ADS1248 devices are

precision, 24-bit analog-to-digital converters (ADCs)

that include many integrated features to reduce

system cost and component count for sensor

measurement applications. The devices feature a

low-noise, programmable gain amplifier (PGA), a

precision delta-sigma (ΔΣ) ADC with a single-cycle

settling digital filter, and an internal oscillator. The

ADS1247 and ADS1248 devices also provide a builtin,

low-drift voltage reference, and two matched

programmable excitation current sources (IDACs).

An input multiplexer supports four differential inputs

for the ADS1248, two for the ADS1247, and one for

the ADS1246. In addition, the multiplexer integrates

sensor burn-out detection, voltage bias for

thermocouples, system monitoring, and general

purpose digital I/Os (ADS1247 and ADS1248). The

PGA provides selectable gains up to 128 V/V. These

features provide a complete front-end solution for

temperature sensor measurement applications

including thermocouples, thermistors, and resistance

temperature detectors (RTDs) and other small signal

measurements including resistive bridge sensors.

The digital filter settles in a single cycle to support

fast channel cycling when using the input multiplexer

and provides data rates up to 2 kSPS. For data rates

of 20 SPS or less, both 50-Hz and 60-Hz interference

are rejected by the filter.