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ADX920AQFN32

  • A low-noise PGA paired with a 24-bit high-precision ADC for analog ECG front-end processing.

Product details

  • Parameters

  • Characteristics

  • Package

  • Description

    • One PGA and one 24-bit high-precision ADC.

    • SPI communication with a sampling rate of 16 Ksps.

    • -40°C to +85°C

    • • Three low-noise (ADX923) PGAs and two high-resolution ADCs (ADX922/3)

      8.6μVPP (G = 6) 

    • • Input bias current

      100pA

    • • Data rate

      125 SPS to 8 kSPS.

    • • Common Mode Rejection Ratio

      117dB

    • • Programmable gain

      1, 2, 3, 4, 6, 8, or 12

    • • Built-in right leg drive amplifier, lead-off detection, test signal • Integrated respiration impedance measurement (ADX922/3)

    • • Electrode Rotation Mode (ERM) enables time-division multiplexing for LEAD-I, LEAD-II, and LEAD-III measurements (ADX923)

    • • Integrated digital AC lead-off measurement and software-based AC lead-off measurement (ADX922/3)

    • • Integrated analog PACE measurement (ADX921/2/3)

    • • Flexible power modes: High-resolution mode and high-speed mode (ADX921/2/3)

    • • Built-in oscillator and reference

    • • Power supply monitoring, internal temperature sensor, and over-range detection

    • • Flexible power-down and standby modes

    • • SPI™ compatible serial interface with timeout reset functionality

    • • Communication with cyclic redundancy check (CRC) and checksum

    • • Supports ADC data FIFO to reduce polling time for external devices and conserve power

    • • Functional safety

    • • Supports systems compliant with IEC 60601-2-47 standard

    • • Operating temperature range

      -40°C to 85°C

    • QFN32 4mm x 4mm

  • The ADX920/1/2/3 devices are multichannel, simultaneous sampling, 24-bit, delta-sigma (ΔΣ) analog-to-digital converters (ADCs) with built-in programmable gain amplifiers (PGAs), internal reference, and oscillator. These devices integrate all the functionalities typically required for portable, low-power medical electrocardiogram (ECG), motion, and fitness applications. With high integration and excellent performance, the ADX920/1/2/3 devices enable the creation of scalable medical instrument systems with significantly reduced size, power consumption, and overall cost. Each channel of the ADX920/1/2/3 devices features a flexible input multiplexer that can independently connect to internally generated signals for testing, temperature, and lead-off detection. Additionally, any input channel configuration can be used to derive the right-leg drive (RLD) output signal. The ADX920/1/2/3 devices operate at data rates of up to 8 kSPS. Lead-off detection can be implemented within the device using the internal excitation current sink or source. The ADX922/3 devices include fully integrated respiration impedance measurement functionality. The specified operating temperature range is –40°C to 85°C.

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