مدار مجتمع (آی سی) آی‌سی جمع‌آوری داده مبدل آنالوگ به دیجیتال (ای‌دی‌سی)

Product Attributes

Introduction

HCT6911 is a 4-channel, 24-bit high-precision ADC with an SPI interface. It integrates a 1×–128× programmable low-noise instrumentation amplifier, high-precision Sigma-Delta ADC, two precision current sources, high-performance temperature sensor, 10 ppm/°C high-precision voltage reference, bias voltage output circuit, and precision internal RC clock source. At 1× PGA gain, the effective resolution reaches 22.5 bits; at 64× PGA gain, 20.8 bits. The equivalent input noise is as low as 15 nV/√Hz, offset voltage is 1 μV, and offset temperature coefficient is below 10 nV/°C. The output data rate is configurable from 3.125 Hz to 6400 Hz. This device is suited for high-performance temperature sensing, analytical balances, industrial process control, DC/AC energy metering, and instrumentation applications requiring high-precision, low-offset measurements.

Features

• Operating voltage range: 2.8~5.5V
• Integrated low-noise amplifier with configurable gain: 1/2/4/8/16/32/64/128×
• 4 signal input channels, configurable as 4 single-ended inputs or 2 differential inputs
• Integrated dual precision current sources and one voltage bias circuit, configurable to input channels
• 24-bit high-precision, low-drift Sigma-Delta ADC
• 11 selectable decimation rates: 3.125Hz~6400Hz
• 50Hz and 60Hz power-line interference rejection
• DC offset auto-calibration
• Linearity: 0.001% FS
• Noise floor: 15nV/√Hz @128× PGA
• Zero drift: 1μV @64/128× PGA
• Integrated 2.4576MHz internal high-frequency RC oscillator; production frequency deviation <1%; temperature drift 1% over -40~85°C
• External pin input for precision clock
• Built-in high-precision temperature sensor; deviation 1°C over -40~85°C
• Standard 4-wire or 3-wire SPI interface; max communication clock frequency 10MHz
• Single-register and multi-register burst read/write
• Command frame parity protection
• CRC protection for write and read operations
• Software global reset and power-on auto-reset
• Undervoltage alarm
• Operating temperature range: -40~+105°C
• Package: TSSOP16

Applications

• Thermocouple temperature measurement
• RTD temperature measurement
• Bridge sensor measurement
• Single-ended signal input