ADS1299/ADS1299-x Low-Noise ADCs

By Texas Instruments 214

ADS1299/ADS1299-x Low-Noise ADCs

Texas Instruments' ADS1299-4, ADS1299-6, and ADS1299 devices are a family of 4-, 6-, or 8-channel, low-noise, 24-bit, simultaneous-sampling delta-sigma (ΔΣ) analog-to-digital converters (ADCs) with a built-in programmable gain amplifier (PGA), internal reference, and an onboard oscillator. The ADS1299-x incorporates all commonly-required features for extracranial electroencephalogram (EEG) and electrocardiography (ECG) applications. With its high levels of integration and exceptional performance, the ADS1299-x enables the creation of scalable medical instrumentation systems at significantly reduced size, power, and overall cost.

The ADS1299-x has a flexible input multiplexer per channel that can be independently connected to the internally-generated signals for test, temperature, and lead-off detection. Additionally, any configuration of input channels can be selected for derivation of the patient bias output signal. Optional SRB pins are available to route a common signal to multiple inputs for a referential montage configuration. The ADS1299-x operates at data rates from 250 SPS to 16 kSPS. Lead-off detection can be implemented internal to the device using an excitation current sink or source.

Multiple ADS1299-4, ADS1299-6, or ADS1299 devices can be cascaded in high channel count systems in a daisy-chain configuration. The ADS1299-x is offered in a TQFP-64 package specified from -40°C to +85°C.

  • Up to eight low-noise PGAs and eight high-resolution simultaneous-sampling ADCs
  • Input-referred noise: 1 µVPP (70 Hz BW)
  • Input bias current: 300 pA
  • Data rate: 250 SPS to 16 kSPS
  • CMRR: -110 dB
  • Unipolar or bipolar supplies:
    • Analog: 4.75 V to 5.25 V
    • Digital: 1.8 V to 3.6 V
  • Programmable gain: 1, 2, 4, 6, 8, 12, or 24
  • Built-in bias drive amplifier, lead-off detection, test signals
  • Built-in oscillator
  • Internal or external reference
  • Flexible power-down, standby mode
  • Pin-compatible with the ADS129x
  • SPI-compatible serial interface
  • Operating temperature range: -40°C to +85°C
  • Medical instrumentation including:
    • Electroencephalogram (EEG) study
    • Fetal electrocardiography (ECG)
    • Sleep study monitor

    • Bispectral index (BIS)
    • Evoked audio potential (EAP)