ADS1191 Complete Low Power Integrated Analog Front End for ECG Applications | TI.com

ADS1191 (ACTIVE)

Complete Low Power Integrated Analog Front End for ECG Applications

Complete Low Power Integrated Analog Front End for ECG Applications - ADS1191
 

Description

The ADS1191/2 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.

The ADS1191/2 incorporate all of the features that are commonly required in portable, low-power medical electrocardiogram (ECG), sports, and fitness applications.

With its high levels of integration and exceptional performance, the ADS1191/2 family enables the creation of scalable medical instrumentation systems at significantly reduced size, power, and overall cost.

The ADS1191/2 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 ADS1191/2 operate at data rates up to 8 kSPS. Lead-off detection can be implemented internal to the device, using the device internal excitation current sink/source.

The devices are packaged in a 5-mm × 5-mm, 32-pin thin quad flat pack (TQFP). Operating temperature is specified from –40°C to +85°C.

Features

  • Two Low-Noise PGAs and
    Two High-Resolution ADCs (ADS1192)
  • Low Power: 335 µW/channel
  • Input-Referred Noise: 24 µVPP
    (150-Hz BW, G = 6)
  • Input Bias Current: 1 nA
  • Data Rate: 125 SPS to 8 kSPS
  • CMRR: –95 dB
  • Programmable Gain: 1, 2, 3, 4, 6, 8, or 12
  • Supplies: Unipolar or Bipolar
    • Analog: 2.7 V to 5.25 V
    • Digital: 1.7 V to 3.6 V
  • Built-In Right Leg Drive Amplifier, Lead-Off Detection, Test Signals
  • Built-In Oscillator and Reference
  • Flexible Power-Down, Standby Mode
  • SPI™-Compatible Serial Interface
  • Operating Temperature Range: –40°C to +85°C

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Parametrics Compare all products in Precision ADCs (<=10MSPS)

 
Resolution (Bits)
Sample Rate (Max) (kSPS)
Number of input channels
Interface
Operating Temperature Range (C)
Package Group
Approx. Price (US$)
Power Consumption (Typ) (mW)
Package Size: mm2:W x L (PKG)
Architecture
Input Type
Multi-Channel Configuration
Reference Mode
Features
Input Range (Max) (V)
Input Range (Min) (V)
Analog Voltage AVDD (Min) (V)
Analog Voltage AVDD (Max) (V)
Digital Supply (Min) (V)
Digital Supply (Max) (V)
INL (Max) (+/-LSB)
SNR (dB)
THD (Typ) (dB)
Rating
Sample Rate (Max) (MSPS)
ADS1191 ADS1192 ADS1291 ADS1292 ADS1292R
16     16     24     24     24    
8     8     8     8     8    
1     2     1     2     2    
SPI     SPI     SPI     SPI     SPI    
-40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85    
TQFP | 32
VQFN | 32    
TQFP | 32
VQFN | 32    
TQFP | 32
VQFN | 32    
TQFP | 32
VQFN | 32    
TQFP | 32
VQFN | 32    
2.95 | 1ku     3.85 | 1ku     3.75 | 1ku     4.65 | 1ku     4.85 | 1ku    
0.335     0.67     0.35     0.7     0.7    
32TQFP: 49 mm2: 7 x 7 (TQFP | 32)
32VQFN: 16 mm2: 4 x 4 (VQFN | 32)    
32TQFP: 49 mm2: 7 x 7 (TQFP | 32)
32VQFN: 16 mm2: 4 x 4 (VQFN | 32)    
32TQFP: 49 mm2: 7 x 7 (TQFP | 32)
32VQFN: 16 mm2: 4 x 4 (VQFN | 32)    
32TQFP: 49 mm2: 7 x 7 (TQFP | 32)
32VQFN: 16 mm2: 4 x 4 (VQFN | 32)    
32TQFP: 49 mm2: 7 x 7 (TQFP | 32)
32VQFN: 16 mm2: 4 x 4 (VQFN | 32)    
Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
N/A     Simultaneous Sampling     N/A     Simultaneous Sampling     Simultaneous Sampling    
Int
Ext    
Int
Ext    
Int
Ext    
Int
Ext    
Int
Ext    
Daisy-Chainable
GPIO
Oscillator
PGA    
Daisy-Chainable
GPIO
Oscillator
PGA    
Daisy-Chainable
GPIO
Oscillator
PGA    
Daisy-Chainable
GPIO
Oscillator
PGA    
Daisy-Chainable
GPIO
Oscillator
PGA    
5.25     5.25     5.25     5.25     5.25    
0     0     0     0     0    
2.7     2.7     2.7     2.7     2.7    
5.25     5.25     5.25     5.25     5.25    
1.7     1.7     1.7     1.7     1.7    
3.6     3.6     3.6     3.6     3.6    
1     1     2     2     2    
92     92     107     107     107    
-100     -100     -104     -104     -104    
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