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ADX923AQFN32

  • Integrated respiration impedance, three low-noise PGAs, and two 24-bit high-precision ADCs for analog ECG front-end.

Product details

  • Parameters

  • Characteristics

  • Package

  • Description

    • Integrated respiration impedance, three PGAs, two 24-bit high-precision ADCs, SPI communication, and a sampling rate of 16Ksps.

    • -40°C to+85°C

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

    • • Input-referred noise.

      8.6μVPP (G = 6) 

    • • Input bias current

      100pA 

    • • Data rate

      125SPS 至 8kSPS 

    • • Common Mode Rejection Ratio

      117dB

    • • Programmable gain

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

    • Analog power supply

      2.7V to 5.5V

    • digital power supply

      1.65V to 3.6V

    • • Built-in right leg drive amplifier, lead-off detection, test signal.

    • • Integrated respiratory impedance measurement (ADX922/3).

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

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

    • High speed mode (ADX921/2/3)

    • • Built-in Oscillator and Reference

    • • Power supply monitor, internal temperature sensor, OSC failure detection, 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 multi-channel, simultaneous sampling, 24-bit, Delta-Sigma (ΔΣ) analog-to-digital converters (ADCs) that feature a programmable gain amplifier (PGA), an internal reference, and an on-board oscillator. These devices integrate all the functionalities typically required for portable, low-power medical electrocardiogram (ECG) applications, as well as for fitness and exercise monitoring systems. With their high level of 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 includes a flexible input multiplexer that can independently connect to internally generated signals for testing, temperature measurement, and lead-off detection. Moreover, any input channel configuration can be configured to derive a right-leg drive (RLD) output signal. The ADX920/1/2/3 devices operate at data rates up to 8 kSPS. Lead-off detection can be accomplished internally using the device's current sink or source excitation capabilities. The ADX922/3 models additionally feature fully integrated respiratory impedance measurement functionality. The specified operating temperature range is from –40°C to 85°C.

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