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

Product Attributes

Introduction

HCT693x is an 8-channel, 24-bit high-precision ADC with SPI interface, integrating a 1× to 128× programmable low-noise instrumentation amplifier, high-precision Σ-Δ ADC, dual precision current sources, high-performance temperature sensor, 5ppm/°C high-precision voltage reference, bias voltage output circuit, and precision internal RC clock source. The ADC achieves an effective resolution of 24 bits at 1× PGA and 21.5 bits at 64× PGA, with equivalent input noise as low as 11nV/√Hz, offset voltage of 1μV, and offset 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. This device 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 with configurable gain of 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, assignable to 8 input channels
• Integrated 5ppm/°C, 2.5V high-precision voltage reference with load regulation < 60μV/mA
• 24-bit high-precision low-offset Σ-Δ ADC
• 11 selectable decimation rates from 3.125Hz to 6400Hz
• Data rate 6.25Hz to 12800Hz in high-power and frequency-doubling modes
• 50Hz and 60Hz synchronous rejection
• DC offset self-calibration
• Linearity: 0.0005% FS, 24 effective bits
• Noise level: 11nV/√Hz @ 128× PGA
• Offset: 1μV @ 64/128× PGA
• Integrated 2.4576MHz internal high-frequency RC clock with batch frequency deviation < 1% and temperature drift of 1% over -40~85°C
• External precision clock input via dedicated pin
• Built-in low-impedance ground switch
• Built-in high-precision temperature sensor with ±1°C accuracy over -40~85°C
• SPI interface: standard 4-wire or 3-wire SPI, up to 10MHz clock, single/burst register read/write, command frame parity and CRC protection
• System functions: software global reset, power-on auto-reset, undervoltage alert
• Operating temperature range: -40~+105°C
• Storage temperature range: -40~+125°C
• Package: TSSOP24/QFN24L