Low-Noise, 8 Channel, 16 Bit Analog Front End for ECG/EEG Measurements - ADS1198

ADS1198 (ACTIVE)

Low-Noise, 8 Channel, 16 Bit Analog Front End for ECG/EEG Measurements

 

Description

The ADS1194/6/8 are a family of multichannel, simultaneous sampling, 16-bit, delta-sigma (ΔΣ) analog-to-digital converters (ADCs) with a built-in programmable gain amplifier (PGA), internal reference, and an onboard oscillator.

With its high levels of integration and exceptional performance, the ADS1194/6/8 family enables the creation of scalable medical instrumentation systems at significantly reduced size, power, and overall cost.

The ADS1194/6/8 have 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 right leg drive (RLD) output signal. The ADS1194/6/8 operate at data rates as high as 8kSPS, thereby allowing the implementation of software pace detection. Lead-off detection can be implemented internal to the device, either with a pull-up/pull-down resistor or an excitation current sink/source. Three integrated amplifiers generate the Wilson Center Terminal (WCT) and the Goldberger terminals (GCT) required for a standard 12-lead medical electrocardiogram (ECG).

Multiple ADS1194/6/8 devices can be cascaded in high channel count systems in a daisy-chain configuration.

Package options include a tiny 8mm × 8mm, 64-ball BGA and a TQFP-64. Both packages are specified over the temperature range of 0°C to +70°C.

Features

  • Eight Low-Noise PGAs and
    Eight High-Resolution ADCs (ADS1198)
  • Low Power: 0.55mW/channel
  • Input-Referred Noise:
    12µVPP (150Hz BW, G = 6)
  • Input Bias Current: 200pA
  • Data Rate: 125SPS to 8kSPS
  • CMRR: –105dB
  • Programmable Gain: 1, 2, 3, 4, 6, 8, or 12
  • Supports AAMI EC11, EC13, IEC60601-1, IEC60601-2-27, and IEC60601-2-51 Standards
  • Supplies: Unipolar or Bipolar
    • Analog: 2.7V to 5.25V
    • Digital: 1.65V to 3.6V
  • Built-In Right Leg Drive Amplifier, Lead-Off Detection, WCT, Test Signals
  • Pace Detection Channel Select
  • Built-In Oscillator and Reference
  • Flexible Power-Down, Standby Mode
  • SPI™-Compatible Serial Interface
  • Operating Temperature Range:
    0°C to +70°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$)
ADS1198 ADS1298
8    8   
2.7    2.7   
5.25    5.25   
Daisy-Chainable
GPIO
Oscillator
PGA   
Daisy-Chainable
GPIO
Oscillator
PGA   
5    5   
Delta-Sigma    Delta-Sigma   
0.2    0.2   
12.2    3   
0.5    0.5   
3.6    3.6   
1.65    1.65   
Int
Ext   
Int
Ext   
SPI    SPI   
500    500   
Catalog    Catalog   
0 to 70    -40 to 85
0 to 70   
NFBGA
TQFP   
NFBGA
TQFP   
1.3    2.75   
15    8   
2    2   
1
2
3
4
6
8
12   
1
2
3
4
6
8
12   
0.54    0.75   
14.35 | 1ku    23.95 | 1ku