HCTmicro HCT6919

HCT6919 is a 6-channel, 24-bit high-precision ADC with an SPI interface, integrating a 1×–128× programmable low-noise instrumentation amplifier, a high-precision Sigma-Delta ADC, and an accurate internal RC clock source. The ADC achieves an effective number of bits of 22.9 bits at 1× PGA gain and 21.2 bits at 64× PGA gain, with an equivalent input noise as low as 11nV/√Hz, zero drift of 1uV, and zero drift temperature coefficient below 10nV/℃. The output data rate is configurable from 3.125Hz to 12800Hz. This device is suitable for analytical balances, industrial process control, instrumentation, and other high-precision, low-drift measurement applications.

• Supply voltage range: 2.8~5.5V
• Operating current: Normal mode 360uA, low-power mode 260uA, sleep mode 1uA
• Integrated low-noise amplifier with configurable gains of 1, 2, 4, 8, 16, 32, 64, 128
• 6-channel signal input, configurable as 6 single-ended inputs or 3 differential inputs
• 24-bit high-precision, low-drift Sigma-Delta ADC; supports 11 decimation rates (3.125Hz~6400Hz), 50Hz/60Hz synchronous rejection, DC offset self-calibration; linearity 0.001% FS; 24 effective bits; noise level 15nV/√Hz @128× PGA; zero drift 1uV @64/128× PGA
• Integrated 2.4576MHz internal high-frequency RC clock; production frequency deviation <1%; temperature drift 1% over -40~85℃
• SPI interface: standard 4-wire or 3-wire SPI; up to 10MHz clock; single and burst register read/write; command frame parity protection; CRC protection for read/write operations
• System functions: software global reset, power-on auto reset, undervoltage alert (3V)
• Operating temperature range: -40~+105℃
• Storage temperature range: -40~+125℃
• Package: TSSOP16