1 Features

1• 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

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

• Unipolar or Bipolar Supplies:

– Analog: 4.75 V to 5.25 V

– Digital: 1.8 V to 3.6 V

• 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

2 Applications

• Medical Instrumentation Including:

– Electroencephalogram (EEG) Study

– Fetal Electrocardiography (ECG)

– Sleep Study Monitor

– Bispectral Index (BIS)

– Evoked Audio Potential (EAP)

3 Description

The ADS1299-4, ADS1299-6, and ADS1299 devices

are a family of four-, six-, and eight-channel, lownoise,

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.