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CD24AD92-2CQ
High Precision ADCs
CD24AD92-2CQ is a 2-channel, low-noise, 24-bit synchronous sampling delta-sigma analog-to-digital converter (ADC). This product integrates a programmable gain amplifier (PGA), an internal reference, and a clock oscillator.
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Description
CD24AD92-2CQ is a 2-channel, low-noise, 24-bit synchronous sampling delta-sigma analog-to-digital converter (ADC). The device integrates a programmable gain amplifier (PGA), internal reference, and clock oscillator. CD24AD92-2CQ provides the features required for extracranial EEG and ECG applications. With high integration and superior performance, CD24AD92-2CQ enables users to build wearable brain-computer interface systems in a much smaller form factor. CD24AD92-2CQ is equipped with a flexible input multiplexer for each channel. The multiplexer can be independently connected to internally generated signals to perform test, temperature, and lead-off detection. In addition, the body bias output signal can be generated from any configuration of the input channels. Optional SRB1/2 pins are also available to serve as the opposite input for single-ended (P/N) sampling. Channel 1 can be configured for respiration detection mode if required. CD24AD92-2CQ operates at data rates from 250 SPS to 16 kSPS. Lead-off detection is implemented internally via excitation current sources. Multiple CD24AD92-2CQ devices can be connected in a daisy-chain configuration in systems with a large number of channels. CD24AD92-2CQ is offered in a QFN32 (5 mm × 5 mm) package.

  • Input-referred noise: 1.2 uVpp (at 70 Hz bandwidth)

  • Input bias current: 300 pA

  • Data rate: 250 ~ 16000 samples per second (SPS)

  • Common-mode rejection ratio (CMRR): -120 dB

  • Programmable gain: 1, 2, 4, 6, 8, 12, or 24

  • Unipolar or bipolar supply:  Analog: 4.75 V to 5.25 V  Digital: 1.8 V to 3.6 V

  • SPI interface

  • Operating temperature range: -40°C ~ +85°C


  • Two low-noise programmable gain amplifiers (PGA) and two high resolution synchronous sampling analog-to-digital converters (ADC)

  • Input-referred noise: 1.2 uVpp (at 70 Hz bandwidth)

  • Input bias current: 300 pA

  • Data rate: 250 ~ 16000 samples per second (SPS)

  • Common-mode rejection ratio (CMRR): -120 dB

  • Programmable gain: 1, 2, 4, 6, 8, 12, or 24

  • Unipolar or bipolar supply:  Analog: 4.75 V to 5.25 V  Digital: 1.8 V to 3.6 V

  • Integrated functions for human bio-signal measurement:  Human bias amplifier  Lead-off detection  Internal test signal

  • Optional internal oscillator

  • Optional internal reference

  • Flexible power-down and standby modes

  • SPI interface

  • Operating temperature range: -40°C ~ +85°C


  • Medical devices for human bioelectric signal measurement:

  • Electroencephalogram (EEG) research

  • Fetal electrocardiogram (ECG) monitoring

  • Sleep study monitoring

  • Bispectral Index (BIS)

  • Evoked Audio Potentials (EAP)

Parameters
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Part Number
Package
Resolution(bit)
Sample Rate
Channels
Signal-to-Noise Ratio(dBFS)
Spurious-Free Dynamic Range(dB)
Power Consumption(mW)
Temp Range(°C)
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CD24AD92-2CQ
CD24AD92-2CQ is a 2-channel, low-noise, 24-bit synchronous sampling delta-sigma analog-to-digital converter (ADC). This product integrates a programmable gain amplifier (PGA), an internal reference, and a clock oscillator.
Datasheet
PackageQFN-32
Resolution(bit) 24
Sample Rate 16
Channels 2
Signal-to-Noise Ratio(dBFS) 113
Spurious-Free Dynamic Range(dB)
Power Consumption(mW) 17.3
Temp Range(°C) -40 to 85
Open
CD24AD92-2CQP
CD24AD92-2CQ is a 2-channel, low-noise, 24-bit synchronous sampling delta-sigma analog-to-digital converter (ADC). This product integrates a programmable gain amplifier (PGA), an internal reference, and a clock oscillator.
Datasheet
PackageTQFP-32
Resolution(bit) 24
Sample Rate 16
Channels 2
Signal-to-Noise Ratio(dBFS) 113
Spurious-Free Dynamic Range(dB)
Power Consumption(mW) 17.3
Temp Range(°C) -40 to 85
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