ADS1294 (ACTIVE)

4-Channel 24-Bit ADC With Integrated ECG Front End

4-Channel 24-Bit ADC With Integrated ECG Front End - ADS1294
 

Description

The ADS1294, ADS1296, ADS1298 (ADS129x) and ADS1294R, ADS1296R ADS1298R (ADS129xR) are a family of multichannel, simultaneous sampling, 24-bit, delta-sigma (ΔΣ) analog-to-digital converters (ADCs) with built-in programmable gain amplifiers (PGAs), internal reference, and an onboard oscillator. The ADS129x and ADS129xR incorporate all of the features that are commonly required in medical electrocardiogram (ECG) and electroencephalogram (EEG) applications. With high levels of integration and exceptional performance, the ADS129x and ADS129xR enables the development of scalable medical instrumentation systems at significantly reduced size, power, and overall cost.

The ADS129x and ADS129xR have a flexible input multiplexer (mux) 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 ADS129x and ADS129xR operate at data rates as high as 32 kSPS, thereby allowing the implementation of software pace detection. Lead-off detection can be implemented internal to the device, either with a pullup or pulldown resistor, or an excitation current sink or source. Three integrated amplifiers generate the Wilson central terminal (WCT) and the Goldberger central terminals (GCT) required for a standard 12-lead ECG. The ADS129xR versions include a fully integrated, respiration impedance measurement function. Multiple ADS129x and ADS129xR devices can be cascaded in high channel count systems in a daisy-chain configuration.

Package options include a tiny 8-mm × 8-mm, 64-ball BGA, and a TQFP-64. The ADS129x BGA version is specified over the commercial temperature range of 0°C to 70°C. The ADS129xR BGA and ADS129x TQFP versions are specified over the industrial temperature range of –40°C to +85°C.

Features

  • Eight Low-Noise PGAs and Eight High-Resolution ADCs (ADS1298, ADS1298R)
  • Low Power: 0.75 mW/channel
  • Input-Referred Noise: 4 μVPP (150 Hz BW, G = 6)
  • Input Bias Current: 200 pA
  • Data Rate: 250 SPS to 32 kSPS
  • CMRR: –115 dB
  • Programmable Gain: 1, 2, 3, 4, 6, 8, or 12
  • Supports systems meeting AAMI EC11, EC13, IEC60601-1, IEC60601-2-27, and IEC60601-2-51 Standards
  • Unipolar or Bipolar Supplies:
    • AVDD = 2.7 V to 5.25 V
    • DVDD = 1.65 V to 3.6 V
  • Built-In Right Leg Drive Amplifier, Lead-Off Detection, Wilson Center Terminal, Pace Detection, Test Signals
  • Integrated Respiration Impedance Measurement
  • Digital Pace Detection Capability
  • Built-In Oscillator and Reference
  • SPI™-Compatible Serial Interface

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

 
Resolution (Bits)
Sample Rate (Max) (kSPS)
# 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)
Sample Rate (Max) (MSPS)
ADS1294 ADS1192 ADS1194 ADS1292 ADS1292R ADS1293 ADS1294R
24    16    16    24    24    24    24   
32    8    8    8    8    25.6    32   
4    2    4    2    2    3    4   
SPI    SPI    SPI    SPI    SPI    SPI    SPI   
-40 to 85
0 to 70   
-40 to 85    0 to 70    -40 to 85    -40 to 85    -20 to 85    -40 to 85   
NFBGA
TQFP   
TQFP
VQFN   
NFBGA
TQFP   
TQFP
VQFN   
TQFP
VQFN   
WQFN    NFBGA   
11.95 | 1ku    3.85 | 1ku    7.80 | 1ku    4.65 | 1ku    4.85 | 1ku    6.50 | 1ku    11.95 | 1ku   
3    0.67    3    0.7    0.7    0.9    4.1   
64NFBGA: 64 mm2: 8 x 8(NFBGA)
64TQFP: 144 mm2: 12 x 12(TQFP)   
32TQFP: 49 mm2: 7 x 7(TQFP)
32VQFN: 16 mm2: 4 x 4(VQFN)   
64NFBGA: 64 mm2: 8 x 8(NFBGA)
64TQFP: 144 mm2: 12 x 12(TQFP)   
32TQFP: 49 mm2: 7 x 7(TQFP)
32VQFN: 16 mm2: 4 x 4(VQFN)   
32TQFP: 49 mm2: 7 x 7(TQFP)
32VQFN: 16 mm2: 4 x 4(VQFN)   
28WQFN: 25 mm2: 5 x 5(WQFN)    64NFBGA: 64 mm2: 8 x 8(NFBGA)   
Delta-Sigma    Delta-Sigma    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   
Differential    Differential
Single-Ended   
Simultaneous Sampling    Simultaneous Sampling    Simultaneous Sampling    Simultaneous Sampling    Simultaneous Sampling    Simultaneous Sampling    Simultaneous Sampling   
Int
Ext   
Int
Ext   
Int
Ext   
Int
Ext   
Int
Ext   
Int    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   
Oscillator    Daisy-Chainable
GPIO
Oscillator
PGA   
5.25    5.25    5.25    5.25    5.25    0.4    5.25   
0    0    0    0    0    0    0   
2.7    2.7    2.7    2.7    2.7    2.7    2.7   
5.25    5.25    5.25    5.25    5.25    5.5    5.25   
1.65    1.7    1.65    1.7    1.7    1.65    1.65   
3.6    3.6    3.6    3.6    3.6    3.6    3.6   
8    1    1    2    2      8   
112    92    97    107    107      112   
-98    -100    -95    -104    -104      -98   
0.032    0.008    0.008    0.008    0.008    0.0256    0.032