24-Bit, 8-Ch, ADC for EEG - ADS1299

ADS1299 (ACTIVE)

24-Bit, 8-Ch, ADC for EEG

 

Description

The ADS1299-4, ADS1299-6, and ADS1299 devices are a family of four-, six-, and eight-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.

Features

  • 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

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Parametrics Compare all products in Electrocardiogram (ECG)

 
# Input Channels
Analog Voltage AVDD (Min) (V)
Analog Voltage AVDD (Max) (V)
Integrated Features
Gain Drift (Typ) (ppm/C)
Architecture
Gain Error (Typ) (%)
Input-referred Noise (Typ) (uVpp)
IDVDD Supply Current (Typ) (mA)
Digital Supply (Max) (V)
Digital Supply (Min) (V)
Reference Mode
Interface
Offset Error (Typ) (uV)
Rating
Operating Temperature Range (C)
Package Group
IAVDD Supply Current (Typ) (mA)
INL (Typ) (ppm)
Offset error drift (Typ) (uV/C)
PGA Gain (Typ) (V/V)
Power/Channel (Typ) (mW)
Approx. Price (US$)
ADS1299 ADS1298
8    8   
4.75    2.7   
5.25    5.25   
Daisy-Chainable
GPIO
Oscillator
PGA   
Daisy-Chainable
GPIO
Oscillator
PGA   
2    5   
Delta-Sigma    Delta-Sigma   
0.1    0.2   
1    3   
0.5    0.5   
3.6    3.6   
1.8    1.65   
Int
Ext   
Int
Ext   
SPI    SPI   
60    500   
Catalog    Catalog   
-40 to 85    -40 to 85
0 to 70   
TQFP    NFBGA
TQFP   
7.14    2.75   
8    8   
0.09    2   
1
2
4
6
8
12
24   
1
2
3
4
6
8
12   
5.125    0.75   
36.00 | 1ku    23.95 | 1ku   

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