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ADS1294IPAGR

IC AFE 24BIT 64-TQFP

Part Number: ADS1294IPAGR

Manufacturer: Texas Instruments

Category: Analog Front End (AFE)

Package: 64-TQFP

Datasheet:: ADS1294IPAGR.pdf

Description: IC AFE 24BIT 64-TQFP

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PRODUCT INFORMATION

Product Details

PRODUCT TECHNICAL REFERENCE

ADS1294IPAGR Low-Power, 4-Channel, 24-Bit Analog Front-End for Biopotential Measurements

A comprehensive technical overview of the ADS1294IPAGR, a 4-channel, simultaneous-sampling, 24-bit delta-sigma analog-to-digital converter from Texas Instruments. Covers device function, core features, electrical specifications, 64-pin TQFP package, pin configuration, typical applications, and replacement selection guidance.

Texas Instruments 64-Pin TQFP (PAG) 2.7V to 5.25V Analog / 1.65V to 3.6V Digital

Device Classification 4-Channel 24-Bit Delta-Sigma ADC for Biopotential Measurements

Part Number: ADS1294IPAGR

Mounting Type: Surface Mount

Operating Temperature Range: -40°C to +85°C

PRODUCT OVERVIEW

What Is the ADS1294IPAGR?

ADS1294IPAGR is a multichannel, simultaneous-sampling, 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) from Texas Instruments with built-in programmable gain amplifiers (PGAs), internal reference, and an onboard oscillator. The device features 4 differential simultaneous-sampling inputs and offers high performance with low power consumption of 0.75 mW per channel.

The ADS1294IPAGR is part of the ADS129x family of multichannel, simultaneous-sampling, 24-bit delta-sigma ADCs designed for medical instrumentation applications including electrocardiogram (ECG), electroencephalogram (EEG), and patient monitoring systems[reference:0]. With high levels of integration and exceptional performance, the device enables the development of scalable medical instrumentation systems at significantly reduced size, power, and overall cost[reference:1].

The device incorporates all features commonly required in medical biopotential measurement applications including flexible input multiplexers per channel that can be independently connected to internally-generated signals for test, temperature, and lead-off detection[reference:2]. Additionally, the built-in right leg drive (RLD) amplifier, lead-off detection, Wilson central terminal (WCT), and pace detection capabilities make this device ideal for 12-lead ECG and other medical diagnostic applications[reference:3].

4-Channel Simultaneous Sampling 4 differential inputs with simultaneous sampling for accurate multi-channel biopotential measurements.

Low Power 0.75 mW per channel power consumption with 4 µVPP input-referred noise at 150 Hz BW, G = 6.

Medical-Grade Integration Built-in RLD amplifier, lead-off detection, Wilson central terminal, and pace detection capability.

DEVICE HIGHLIGHTS

Key Features and Benefits of ADS1294IPAGR

4-Channel Simultaneous Sampling

4 differential simultaneously sampled inputs provide accurate multi-channel biopotential measurements for ECG, EEG, and patient monitoring applications[reference:4].

Low Power & High Performance

0.75 mW per channel power consumption with 4 µVPP input-referred noise at 150 Hz bandwidth and G = 6, enabling high-performance, battery-powered medical devices[reference:5].

Flexible Gain & Data Rates

Programmable gain options: 1, 2, 3, 4, 6, 8, or 12[reference:6]. Data rates from 250 SPS to 32 kSPS provide flexibility for various medical applications[reference:7].

Integrated Medical Features

Built-in right leg drive (RLD) amplifier, lead-off detection, Wilson central terminal (WCT), and pace detection capability for complete ECG front-end solutions[reference:8].

Wide Supply Voltage Range

Analog supply: 2.7 V to 5.25 V (unipolar) or ±2.5 V (bipolar). Digital supply: 1.65 V to 3.6 V[reference:9].

High CMRR & Low Input Bias

CMRR of –115 dB[reference:10] and input bias current of 200 pA[reference:11] ensure excellent common-mode rejection and high-impedance sensor compatibility.

REFERENCE DATA

Technical Specifications for ADS1294IPAGR

Part Number	ADS1294IPAGR	Manufacturer	Texas Instruments
Base Part Number	ADS1294	Device Type	4-Channel 24-Bit Delta-Sigma ADC with PGA
Number of Inputs	4 Differential (Simultaneous Sampling)	Resolution	24 Bits
Analog Supply (AVDD)	2.7 V to 5.25 V	Analog Supply (Bipolar)	±2.5 V
Digital Supply (DVDD)	1.65 V to 3.6 V	PGA Gain Options	1, 2, 3, 4, 6, 8, 12[reference:12]
Data Rates	250 SPS to 32 kSPS[reference:13]	Input-Referred Noise	4 µVPP (150 Hz BW, G = 6)[reference:14]
Power Consumption	0.75 mW/channel[reference:15]	Input Bias Current	200 pA[reference:16]
CMRR	–115 dB[reference:17]	Respiration Impedance	Not Integrated (ADS1294)
Package	64-Pin TQFP (PAG)[reference:18]	Package Body Size	10.00 mm × 10.00 mm[reference:19]
Mounting Type	Surface Mount	Operating Temperature	-40°C to +85°C[reference:20]
Interface	SPI-Compatible[reference:21]	GPIOs	4
RoHS	Yes	MSL Rating	Level-3-260C-168 HR

Electrical values shown above are reference values. Test conditions, limits, and guaranteed performance should always be confirmed from the current official manufacturer datasheet before design or production use.

DESIGN REFERENCE

Circuit Considerations for ADS1294IPAGR

Configuration & Interface

The ADS1294IPAGR is configured via an SPI-compatible serial interface:

Data Rates: Programmable from 250 SPS to 32 kSPS[reference:22]
PGA Gain: Selectable gain settings: 1, 2, 3, 4, 6, 8, 12[reference:23]
Internal Reference: Integrated reference and onboard oscillator[reference:24]
Lead-Off Detection: Internal pullup/pulldown resistors or excitation current sink/source[reference:25]
RLD Amplifier: Built-in right leg drive amplifier for common-mode rejection[reference:26]
Wilson Central Terminal (WCT): Three integrated amplifiers generate WCT and GCT for standard 12-lead ECG[reference:27]

PCB and Power-Supply Guidance

ADC performance depends on layout, bypassing, and power supply design:

Decouple each AVDD pin to AVSS with a 1-µF capacitor
Connect 1-µF capacitor from VCAP2 to AVSS and 22-µF capacitor from VCAP1 to AVSS[reference:28]
Use unipolar (2.7 V to 5.25 V) or bipolar (±2.5 V) analog supplies[reference:29]
Connect any unused analog input pins to AVDD[reference:30]
Multiple ADS129x devices can be cascaded in daisy-chain configuration[reference:31]
Verify the recommended PCB footprint from the official datasheet before production

64-PIN TQFP (PAG)

Pin Configuration Reference for ADS1294IPAGR

ADS1294

TQFP (PAG) TOP VIEW

Confirm package orientation and pin numbering against the official package drawing before PCB layout. The PAG package has 64 pins with 0.5mm pitch[reference:32].

1 IN8N Channel 8 Negative Input (Not Used on ADS1294)[reference:33]

2 IN8P Channel 8 Positive Input (Not Used on ADS1294)[reference:34]

3 IN7N Channel 7 Negative Input (Not Used on ADS1294)[reference:35]

4 IN7P Channel 7 Positive Input (Not Used on ADS1294)[reference:36]

5 IN6N Channel 6 Negative Input (Not Used on ADS1294)[reference:37]

6 IN6P Channel 6 Positive Input (Not Used on ADS1294)[reference:38]

7 IN5N Channel 5 Negative Input (Not Used on ADS1294)[reference:39]

8 IN5P Channel 5 Positive Input (Not Used on ADS1294)[reference:40]

9 IN4N Channel 4 Negative Analog Input[reference:41]

10 IN4P Channel 4 Positive Analog Input[reference:42]

11 IN3N Channel 3 Negative Analog Input[reference:43]

12 IN3P Channel 3 Positive Analog Input[reference:44]

13 IN2N Channel 2 Negative Analog Input[reference:45]

14 IN2P Channel 2 Positive Analog Input[reference:46]

15 IN1N Channel 1 Negative Analog Input[reference:47]

16 IN1P Channel 1 Positive Analog Input[reference:48]

17 TESTP_PACE_OUT1 Test Signal / Pace Output 1[reference:49]

18 TESTN_PACE_OUT2 Test Signal / Pace Output 2[reference:50]

19 AVDD Analog Supply[reference:51]

20 AVSS Analog Ground[reference:52]

21 AVDD Analog Supply[reference:53]

22 AVDD Analog Supply[reference:54]

23 AVSS Analog Ground[reference:55]

24 VREFP Positive Reference Input/Output[reference:56]

25 VREFN Negative Reference Voltage[reference:57]

26 VCAP4 1-µF Bypass Capacitor to AVSS[reference:58]

27 NC No Connect[reference:59]

28 VCAP1 22-µF Bypass Capacitor to AVSS[reference:60]

29 NC No Connect[reference:61]

30 VCAP2 1-µF Bypass Capacitor to AVSS[reference:62]

31 RESV1 Reserved - Tie to DGND[reference:63]

32 AVSS Analog Ground[reference:64]

33 DGND Digital Ground[reference:65]

34 DIN SPI Data Input[reference:66]

35 PWDN Power-Down (Active LOW)[reference:67]

36 RESET System Reset (Active LOW)[reference:68]

37 CLK Master Clock Input/Output[reference:69]

38 START Start Conversion[reference:70]

39 CS SPI Chip Select (Active LOW)[reference:71]

40 SCLK SPI Clock[reference:72]

41 DAISY_IN Daisy-Chain Input - Short to DGND if Not Used[reference:73]

42 GPIO1 General-Purpose I/O[reference:74]

43 DOUT SPI Data Output[reference:75]

44 GPIO2 General-Purpose I/O[reference:76]

45 GPIO3 General-Purpose I/O[reference:77]

46 GPIO4 General-Purpose I/O[reference:78]

47 DRDY Data Ready Output

48 AVSS Analog Ground

49 AVSS Analog Ground

50 RLDREF RLD Amplifier Reference Input

51 RLDINV RLD Amplifier Inverting Input

52 RLDOUT RLD Amplifier Output

53 RLDIN RLD Amplifier Non-Inverting Input

54 WCT Wilson Central Terminal Output

55 AVDD Analog Supply

56 AVDD Analog Supply

57 AVSS Analog Ground

58 RESP_MODN Respiration Modulator Negative Output

59 RESP_MODP Respiration Modulator Positive Output

60 VCAP3 Bypass Capacitor Connection

61 AVDD1 Charge Pump Analog Supply

62 AVSS1 Charge Pump Analog Ground

63 CLKSEL Clock Source Select

64 AVDD Analog Supply

APPLICATION AREAS

Typical Applications for ADS1294IPAGR

Medical Instrumentation

ECG, EMG, and EEG patient monitoring systems with 24-bit resolution and simultaneous sampling[reference:79].

Patient Monitoring

Holter, event, stress, and vital signs monitoring including ECG, AED, and telemedicine applications[reference:80].

Sleep Study & BIS Monitoring

Bispectral Index (BIS), evoked audio potential (EAP), and sleep study monitors[reference:81].

Medical-Grade ECG Systems

Supports systems meeting AAMI EC11, EC13, IEC60601-1, IEC60601-2-27, and IEC60601-2-51 standards[reference:82].

Defibrillators & AED

High-performance analog front-end for automated external defibrillators and emergency medical devices[reference:83].

High-Channel-Count Systems

Multiple ADS129x devices can be cascaded in daisy-chain configuration for high-channel-count systems[reference:84].

REPLACEMENT GUIDANCE

Selecting an Alternative for ADS1294IPAGR

A replacement for the ADS1294IPAGR should not be selected only by product category. The electrical characteristics, package, and pin configuration must be evaluated against the actual circuit requirements.

Number of channels (4 differential, simultaneous)

Resolution (24-bit)

Data rates (250 SPS–32 kSPS)

Power consumption (0.75 mW/channel)

Input-referred noise (4 µVPP)

PGA gain options (1, 2, 3, 4, 6, 8, 12)

Package (64-pin TQFP, 10mm × 10mm)

Operating temperature range (–40°C to +85°C)

Family alternatives: ADS1294IPAG (tube/tray version, same electrical specs), ADS1296IPAG (6-channel version), ADS1298IPAG (8-channel version), ADS1294R (with integrated respiration impedance measurement)[reference:85], ADS1194 (16-bit version, 8 kSPS)[reference:86]. For BGA package options, see NFBGA-64 variants. Select based on channel count, respiration measurement requirements, and packaging needs.

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MANUFACTURER INFORMATION

Texas Instruments

The ADS1294 (ADS1294IPAGR) belongs to the ADS129x family of multichannel, simultaneous-sampling, 24-bit delta-sigma ADCs from Texas Instruments. The family is designed for medical instrumentation applications including electrocardiogram (ECG), electroencephalogram (EEG), and patient monitoring where high performance, low power, and high integration are critical[reference:87]. The ADS1294 supports systems meeting AAMI EC11, EC13, IEC60601-1, IEC60601-2-27, and IEC60601-2-51 medical standards[reference:88].

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Technical Information Disclaimer

This technical guide is provided for product identification and preliminary reference only. Electrical limits, package dimensions, pin configuration, product status, and application suitability must be verified using current official manufacturer documentation before design, procurement, or production.

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Specifications

Product Attribute: Attribute Value

Part Number: ADS1294IPAGR

Manufacturer: Texas Instruments

Package: 64-TQFP

package: 64-TQFP

Series: -

Packaging: Tape & Reel (TR)

Product Status: Active

Number of Bits: 24

Number of Channels: 4

Power (Watts): 10.1 mW

Voltage - Supply, Analog: 2.7V ~ 5.5V

Voltage - Supply, Digital: 1.65V ~ 3.6V

Mounting Type: Surface Mount

Grade: -

Qualification: -

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ADS1294IPAGR is manufactured by Texas Instruments. This page provides purchasing information including manufacturer, category, package, datasheet, stock reference, price reference and product specifications.

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Part Number: ADS1294IPAGR

Manufacturer: Texas Instruments

Package: 64-TQFP

Category: Analog Front End (AFE)

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