ADS1211 - 24-Bit Delta-Sigma ADC, 4-Channel | Texas Instruments
MPN: ADS1211 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.25 | $112.50 |
| 100 | $9.9 | $990.00 |
| 500 | $8.75 | $4,375.00 |
| 1,000 | $7.95 | $7,950.00 |
ADS1211 Overview
A delta-sigma ADC is a type of analog-to-digital converter that uses oversampling and noise shaping to achieve very high resolution, typically 16 to 24 bits. It is ideal for low-frequency, high-precision measurement where accuracy matters more than conversion speed. The ADS1211 belongs to the precision delta-sigma ADC family within the broader data-converter hierarchy, bridging analog sensors and digital processing systems.
Key features include 24-bit resolution (23 bits effective at 10 Hz output rate, 20 bits effective at 1000 Hz), differential inputs, a programmable gain amplifier (PGA), and a programmable digital filter cut-off frequency. The flexible synchronous serial interface is SPI compatible and offers a two-wire control mode for low-cost isolation. Self-calibration ensures accuracy over time and temperature.
Architecturally, the ADS1211 combines a delta-sigma modulator with an on-chip digital filter, producing high-resolution results from a single +5V supply at approximately 12mW power dissipation, suiting portable and battery-powered designs. The VBIAS reference-bias output supports biased sensors such as bridge transducers.
Typical applications include smart transmitters, industrial process control, weigh scales, and chromatography instruments. The integrated 4-channel multiplexer lets multiple sensors share one ADC, cutting system cost and board area.
When designing with the ADS1211, decouple analog and digital supplies carefully, use a low-noise stable reference to realize full 24-bit performance, and configure SPI timing to match the host microcontroller. Prices as of 2026-08-30; verify current distributor stock.
Drop-in alternatives for ADS1211 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS1210U
✅ Drop-In📋 Reference alternative (not in catalog)
ADS1212U
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADS1213U
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADS1211 Maximum Ratings & Electrical Characteristics
| Resolution | 24 bit |
| Effective Resolution | 23 bits at 10 Hz; 20 bits at 1000 Hz |
| Number of Input Channels | 4 (with input multiplexer) |
| Input Type | Differential |
| Architecture | Delta-Sigma |
| Supply Voltage | +5 V single supply |
| Power Dissipation | 12 mW (typical) |
| Interface | SPI-compatible serial (SSI), 2-wire mode supported |
| Programmable Gain Amplifier | Yes (PGA) |
| Digital Filter | Programmable cut-off frequency |
| Calibration | Self-calibration |
| Reference Bias Output | VBIAS |
| Packages | 24-pin DIP, 24-lead SOIC, 28-lead SSOP |
| Mounting Type | Surface Mount (SOIC/SSOP) or Through-Hole (DIP) |
| Applications | Smart transmitters, industrial process control, weigh scales, chromatography, portable instrumentation |
ADS1211 Pin Configuration
| Pin 1 | AIN1 — Multiplexer channel 1 input (ADS1211) |
| Pin 2 | AIN2 — Multiplexer channel 2 input |
| Pin 3 | AIN3 — Multiplexer channel 3 input |
| Pin 4 | AIN4/AGND-adjacent — Multiplexer input - [DATA_NEEDED: exact pin name] |
| Pin 5 | [DATA_NEEDED] — [DATA_NEEDED: pin name] |
| Pin 6 | [DATA_NEEDED] — [DATA_NEEDED: pin name] |
| Pin 7 | [DATA_NEEDED] — [DATA_NEEDED: pin name] |
| Pin 8 | [DATA_NEEDED] — [DATA_NEEDED: pin name] |
| Pin 9 | [DATA_NEEDED] — [DATA_NEEDED: pin name] |
| Pin 10 | [DATA_NEEDED] — [DATA_NEEDED: pin name] |
| Pin 22 | AIN-related — Extra MUX pin on ADS1211 vs ADS1210 |
| Pin 23 | AGND — Analog ground - [DATA_NEEDED: exact pin] |
| Pin 24 | DVDD/AGND-related — Extra pin on ADS1211 - [DATA_NEEDED: exact pin name] |
Typical Applications
ADS1211 is suitable for 6 applications: Weigh Scales and Load Cells, Smart Transmitters, Industrial Process Control, Chromatography Instruments, Portable and Battery-Powered Instrumentation, Temperature Measurement with RTDs and Thermocouples.
Weigh Scales and Load Cells
The ADS1211's 23-bit effective resolution at 10 Hz, differential inputs, and PGA make it a strong fit for load-cell bridge measurement where microvolt-level signals must be resolved. The VBIAS output can bias bridge transducers directly, and self-calibration maintains accuracy over time and temperature. In a typical weigh-scale front end, the bridge output feeds the differential inputs and the SPI-compatible interface streams calibrated results to the host MCU at low data rates, where noise-shaped 24-bit conversion maximizes counting resolution.
Recommended
Smart Transmitters
In 4-20mA smart transmitters, the ADS1211 digitizes sensor signals with 24-bit resolution from a single +5V rail at roughly 12mW, meeting the low loop-power budget. The 4-channel multiplexer lets one converter handle the primary sensor, a secondary diagnostic input, and temperature compensation inputs, cutting converter count. Self-calibration sustains long-term accuracy in field-installed instruments, while the two-wire serial interface mode simplifies galvanic isolation between the field side and the loop controller.
Recommended
Industrial Process Control
Process-control systems use the ADS1211 to digitize slow-moving analog variables such as pressure, flow, and temperature from multiple sensors. Its programmable digital filter cut-off allows rejection of 50/60Hz mains interference, and 20-bit effective resolution at 1000 Hz covers faster control loops. Because the part integrates the 4-channel MUX and PGA, a single ADS1211 can service several transducer channels on one PLC analog-input card, reducing board area, calibration overhead, and BOM cost versus discrete per-channel converters.
Recommended
Chromatography Instruments
Chromatography detectors produce very small, slowly varying analog peaks that demand high resolution and low noise; the ADS1211's 23-bit effective resolution at 10 Hz and programmable filter match this profile. Differential inputs reject common-mode noise from detector electronics, and self-calibration preserves quantitative accuracy between service intervals. The device's low 12mW dissipation also suits compact benchtop instruments, while the SPI/SSI interface integrates cleanly with the instrument's microcontroller or DSP data-acquisition firmware.
Recommended
Portable and Battery-Powered Instrumentation
At approximately 12mW total power from a single +5V supply, the ADS1211 extends battery life in handheld meters, data loggers, and field instruments while still providing 24-bit conversion. The integrated MUX and PGA reduce external component count, shrinking board area in portable enclosures. The two-wire interface mode further minimizes pin count and isolation cost. Designers should balance data rate against resolution, since effective resolution falls from 23 bits at 10 Hz to 20 bits at 1000 Hz, trading throughput for precision in battery-operated designs.
Recommended
Temperature Measurement with RTDs and Thermocouples
The ADS1211's differential inputs, PGA, and VBIAS bias output suit RTD and thermocouple front ends. The PGA amplifies small thermocouple signals ahead of the 24-bit modulator, while VBIAS supports biased sensor topologies such as the +/-10V biased inputs described in TI E2E field usage. Self-calibration compensates offset and gain drift over wide ambient ranges in industrial thermal measurement, and the programmable filter suppresses line-frequency noise picked up by long thermocouple leads.
Recommended
Recommended Products Summary
Engineering reference data for ADS1211 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS1210U | ADS1212U | ADS1213U |
|---|---|---|---|---|
| Package | 24-SOIC (ADS1211U) | 24-SOIC - same | 24-SOIC - same | 24-SOIC - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 24 bit | 24 bit | 24 bit | 24 bit |
| Input Channels | 4 | 1 | 1 | 2 |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single |
| Power Dissipation | ~12 mW | ~12 mW | ~12 mW | ~12 mW |
| Interface | SPI/SSI, 2-wire mode | SPI/SSI, 2-wire mode | SPI/SSI, 2-wire mode | SPI/SSI, 2-wire mode |
| Pin Compatibility | Reference | Compatible except pins 1-3, 22-24 (tie to AGND) | Compatible, extra MUX pins grounded | Compatible, extra MUX pins grounded |
Key Differentiators
- 4 integrated input channels (vs ADS1210U)
- Two-wire serial mode for low-cost isolation (vs ADS1213U)
- VBIAS reference-bias output (vs ADS1220)
Design Notes
Separate analog and digital ground regions on the PCB and join them at a single point near the converter. Decouple AVDD and DVDD with 0.1uF ceramic capacitors placed as close to the pins as possible. Keep the MUX input traces short and guard them with ground to limit leakage into the differential inputs. Per the ADS1211 datasheet (Rev. B), careful supply decoupling is required to realize the full 24-bit noise performance.
Use a low-noise, low-drift voltage reference to achieve 23-bit effective resolution at 10 Hz; reference noise directly limits system resolution. Configure the programmable digital filter cut-off to reject 50/60Hz mains interference for slow industrial signals. When using the VBIAS output to bias bridge transducers, account for its current draw - the datasheet notes ~12mW power dissipation is significant if biased continuously.
Do not substitute ADS1210 for ADS1211 without handling pins 1-3 and 22-24: per TI E2E, these extra channel-input pins must be tied to analog ground on the ADS1210 footprint to avoid floating inputs. Also configure the SPI timing to match the host; the SSI interface offers a 2-wire mode but requires correct serial clock and synchronisation setup for reliable communication.
Compliance Information
Compliance data not present in provided web data; verify on TI.com product page for the specific package suffix (D, U, PW).
