Specifications
| Type | Description |
|---|---|
| Part Number | ADS1291 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Package Case | 32-pin TQFP 5.00 mm x 5.00 mm; 32-pin VQFN 4.00 mm x 4.00 mm |
| ADC Resolution | 24-bit; Delta-sigma ADCs |
| Number of Channels | 2; ADS129x analog front-end |
| ADC Architecture | Delta-sigma; simultaneous sampling ADCs |
| Input PGAs | 2 low-noise PGAs; ADS1292 and ADS1292R |
| Power Consumption Per Channel | 335 uW/channel; low-power operation |
| Input-Referred Noise | 8 uVPP; 150-Hz bandwidth, gain = 6 |
| Input Bias Current | 200 pA; input stage |
| Data Rate | 125 SPS to 8 kSPS; output data rate range |
| CMRR | 120 dB; common-mode rejection ratio |
| Programmable Gain | 1, 2, 3, 4, 6, 8, or 12; PGA gain settings |
| Analog Supply Voltage | 2.7 V to 5.25 V; unipolar or bipolar supplies |
| Digital Supply Voltage | 1.7 V to 3.6 V; digital supply |
| Right Leg Drive Amplifier | Built-in; RLD output signal derivable from selected input channels |
| Lead-Off Detection | Built-in; uses internal excitation current sink or source |
| Test Signals | Built-in; flexible input multiplexer can connect to internally generated test signals |
| Respiration Impedance Measurement | Integrated; ADS1292R only |
| Reference | Built-in internal reference; integrated analog front-end |
| Oscillator | Built-in onboard oscillator; integrated clock source |
| Power Modes | Flexible power-down and standby mode; device functional modes |
| Serial Interface | SPI-compatible; digital communication interface |
| Operating Temperature Range | -40°C to +85°C; specified operating temperature |
| Input Multiplexer | Flexible per-channel input multiplexer; each channel independently connectable to internally generated test, temperature, and lead-off detection signals |
| TQFP Package | 32-pin TQFP, 5.00 mm x 5.00 mm |
| VQFN Package | 32-pin VQFN, 4.00 mm x 4.00 mm |
| Datasheet Status | request_only |
Product Overview
The ADS1291 is a Texas Instruments 2-channel, 24-bit analog front-end in the Signal_Chain category. Its conversion path uses simultaneous-sampling delta-sigma ADCs, with an output data-rate range from 125 SPS to 8 kSPS. Critical analog parameters include 8 uVPP input-referred noise over a 150-Hz bandwidth at gain = 6, 200 pA input bias current, and 120 dB common-mode rejection ratio.
The device supports programmable gain settings of 1, 2, 3, 4, 6, 8, or 12 and uses a flexible per-channel input multiplexer. Each channel can independently connect to internally generated test, temperature, and lead-off detection signals. The analog supply range is 2.7 V to 5.25 V, while the digital supply range is 1.7 V to 3.6 V.
Integration includes a built-in right-leg-drive amplifier, built-in lead-off detection using an internal excitation current sink or source, built-in test signals, an internal reference, an onboard oscillator, flexible power-down and standby modes, and an SPI-compatible serial interface. Package options are 32-pin TQFP at 5.00 mm x 5.00 mm and 32-pin VQFN at 4.00 mm x 4.00 mm, with operation specified from -40°C to +85°C.
Key Features
- 2-channel 24-bit analog front-end architecture
- Simultaneous-sampling delta-sigma ADC conversion
- 125 SPS to 8 kSPS output data rates
- 335 uW/channel low-power operation
- 8 uVPP input-referred noise at gain 6
- 120 dB common-mode rejection ratio
- Programmable gain settings from 1 to 12
- Built-in right-leg-drive amplifier and lead-off detection
- Built-in internal reference and onboard oscillator
- SPI-compatible serial communication interface
Typical Applications
- Biopotential signal acquisition
- Low-power physiological monitoring
- Lead-off detection signal chains
- Right-leg-drive measurement circuits
- SPI-connected analog front ends
- Portable multi-channel sensing designs
Procurement Notes
When requesting a quote for ADS1291, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For analog and signal-chain sourcing, supply voltage, bandwidth, accuracy, noise level, package, temperature grade, input/output configuration and qualification requirements should be verified before approval.
FAQ
What type of converter architecture does ADS1291 use?
ADS1291 uses simultaneous-sampling delta-sigma ADCs with 24-bit resolution. The extracted specifications identify the device as a 2-channel analog front-end with an output data-rate range from 125 SPS to 8 kSPS.
Which package options are listed for ADS1291?
The listed package options are a 32-pin TQFP measuring 5.00 mm x 5.00 mm and a 32-pin VQFN measuring 4.00 mm x 4.00 mm. Both are included in the extracted device information.
What integrated support functions are included?
The extracted facts list a built-in right-leg-drive amplifier, built-in lead-off detection, built-in test signals, an internal reference, an onboard oscillator, flexible power-down and standby modes, and an SPI-compatible serial interface.
What supply ranges are specified for ADS1291?
The analog supply voltage range is 2.7 V to 5.25 V for unipolar or bipolar supplies. The digital supply voltage range is 1.7 V to 3.6 V, according to the extracted datasheet facts.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: June 30, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.