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

Product Attributes

Introduction

HCT6751-6701-6711 is an 8-4-2 channel, 24-bit high-precision ADC with SPI interface, integrating a 1×–128× programmable low-noise instrumentation amplifier, high-precision Sigma-Delta ADC, dual precision current sources (not available on the 6711 variant), high-performance temperature sensor, 5ppm/°C high-precision voltage reference, bias voltage output circuit, and precision internal RC clock. The ADC achieves 24-bit effective resolution at 1× PGA and 21.5-bit 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. Suitable for high-performance temperature sensors, analytical balances, industrial process control, DC/AC power measurement, instrumentation, and other applications requiring high-precision, low-offset measurements.

Features

• Operating voltage range: 2.8~5.5V
• Operating current: normal mode 360μA, low-power mode 260μA, sleep mode 1μA
• Integrated low-noise amplifier with configurable gain: 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 input channels
• Integrated 5ppm/℃, 2.5V high-precision voltage reference with load regulation < 60μV/mA
• 24-bit high-precision low-offset Sigma-Delta ADC
• 11 selectable decimation rates, data rate range 3.125Hz~6400Hz; 6.25Hz~12800Hz in high-power overclocking mode
• 50Hz and 60Hz simultaneous rejection
• DC offset auto-calibration
• Linearity 0.0005%FS, 24 effective bits
• Noise level: 11nV/√Hz @ 128× PGA
• Offset drift: 1μV @ 64/128× PGA
• Integrated 2.4576MHz internal high-frequency RC oscillator, batch frequency deviation < 1%, temperature drift 1% over -40~85℃
• External precision clock input support
• Built-in low-impedance ground switch
• Built-in high-precision temperature sensor, deviation 1℃ over -40~85℃
• 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 alarm (3V)
• Operating temperature range: -40~+105℃
• Storage temperature range: -40~+125℃
• Package options: TSSOP28/TSSOP20/TSSOP16

Applications

• Thermocouple temperature measurement
• RTD resistance temperature measurement
• Flow meter
• Single-ended signal input circuit