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

Recommended alternative parts

  • ADS1298  -  24 bit upgrade to ADS1198
  • ADS1258  -  16 channel, 24-bit sigma delta analog-to-digital converter (ADC)

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

View more

Parametrics Compare all products in Medical Analog Front End

 
Resolution (Bits)
# Input Channels
Pin/Package
Sample Rate (max) (SPS)
Interface
Approx. Price (US$)
Reference Mode
Operating Temperature Range (C)
Architecture
# Input Channels
ADS1198 ADS1194 ADS1196 ADS1294 ADS1294R ADS1296 ADS1296R ADS1298 ADS1298R
16     16     16     24     24     24     24     24     24    
8     4     6     4     4     6     6     8     8    
64NFBGA
64TQFP    
64NFBGA
64TQFP    
64NFBGA
64TQFP    
64NFBGA
64TQFP    
64NFBGA     64NFBGA
64TQFP    
64NFBGA     64NFBGA
64TQFP    
64NFBGA    
8KSPS     8KSPS     8KSPS     32KSPS     32KSPS     32KSPS     32KSPS     32KSPS     32KSPS    
Serial SPI     Serial SPI     Serial SPI     Serial SPI     Serial SPI     Serial SPI     Serial SPI     Serial SPI     Serial SPI    
14.35 | 1ku     7.80 | 1ku     11.35 | 1ku     11.95 | 1ku     11.95 | 1ku     17.95 | 1ku     17.95 | 1ku     23.95 | 1ku     23.95 | 1ku    
Int
Ext    
Int
Ext    
Int
Ext    
Int
Ext    
Int
Ext    
Int
Ext    
Int
Ext    
Int
Ext    
Int
Ext    
0 to 70     0 to 70     0 to 70     -40 to 85
0 to 70    
-40 to 85     -40 to 85
0 to 70    
-40 to 85     -40 to 85
0 to 70    
-40 to 85    
Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma    
8     4     6     4     4     6     6     8     8    

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