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

Product Attributes

Introduction

HCT676x is a 12/6-channel, 24-bit high-precision ADC with an SPI interface. It integrates a low-noise instrumentation amplifier with 1× to 128× programmable gain and a high-precision Sigma-Delta ADC, along with two precision current sources, a high-performance temperature sensor, a 5ppm/°C high-precision voltage reference, a bias voltage output circuit, and a precision internal RC clock source. The ADC achieves an effective resolution of 24 bits at 1× PGA gain and 21.5 bits at 64× PGA gain, with an equivalent input noise as low as 11nV/√Hz, an offset voltage of 1μV, and an offset voltage temperature coefficient below 10nV/°C. The output data rate is configurable from 3.125Hz to 6400Hz, and from 6.25Hz to 12800Hz in high-power, frequency-doubling mode. It is suitable for high-performance temperature sensing, analytical balances, industrial process control, DC/AC energy metering, instrumentation, and other applications requiring high-precision, low-offset measurements.

Features

• Operating voltage range: 2.8~5.5V
• Operating current: 360μA in normal mode, 260μA in low-power mode, 1μA in sleep mode
• Built-in low-noise amplifier: gain configurable as 1/2/4/8/16/32/64/128×
• 8-channel signal input, configurable as 8 single-ended or 4 differential inputs
• Integrated dual precision current sources and one voltage bias circuit, configurable across 8 input signal channels
• Integrated 5ppm/℃, 2.5V high-precision voltage reference; load regulation < 60μV/mA
• 24-bit high-precision, low-offset Sigma-Delta ADC
• 11 selectable decimation rates ranging from 3.125Hz to 6400Hz
• Data rate range of 6.25Hz to 12800Hz in high-power, frequency-doubling mode
• 50Hz and 60Hz power-line frequency rejection
• DC offset self-calibration
• Linearity: 0.0005% FS; effective resolution: 24 bits
• Noise level: 11nV/√Hz at 128× PGA gain
• Offset voltage: 1μV at 64/128× PGA gain
• Integrated 2.4576MHz internal high-frequency RC clock; batch frequency deviation < 1%; temperature drift of 1% over -40~85℃
• External pin input for precision clock
• Built-in low-impedance ground switch
• Built-in high-precision temperature sensor; deviation of 1℃ over -40~85℃
• SPI interface
• Standard 4-wire or 3-wire SPI
• Communication clock up to 10MHz
• Single-register and multi-register burst read/write
• Command frame parity protection
• CRC protection for write and read operations