ADS1255IDBR - 24-Bit 30kSPS Low-Noise ADC | Texas Instruments
MPN: ADS1255IDBR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.2373 | $6.24 |
| 10 | $6.2373 | $62.37 |
| 100 | $6.2373 | $623.73 |
| 500 | $6.2373 | $3,118.65 |
| 1,000 | $6.2373 | $6,237.30 |
ADS1255IDBR Overview
A delta-sigma ADC is a voltage-regulating feedback modulator followed by digital filtering and decimation. It trades a relatively simple analog input stage for high resolution, strong noise suppression, and flexible conversion rates. The ADS1255 belongs to the ADC/DAC category within broader data-converter, signal-processing, and semiconductor hierarchies.
Verified headline features include 24-bit resolution, no missing codes, a maximum output rate of 30kSPS, fast channel cycling, differential or single-ended input support, and programmable-gain operation. According to the Texas Instruments ADS1255 datasheet, every data-rate and PGA setting provides noise-free resolution to 23 bits. The published maximum nonlinearity is ±0.0010%.
Technically, the fourth-order delta-sigma modulator shapes quantization noise away from the signal band, while the programmable digital filter removes that shaped noise and averages samples. A serial interface configures the converter and transfers conversion results. This architecture favors low-noise measurement rather than very high instantaneous throughput.
Typical uses include precision pressure and load-cell front ends, industrial transmitters, laboratory instrumentation, temperature measurement, low-level sensor acquisition, and communication equipment. Differential input is valuable when sensor leads can pick up noise or when the source has meaningful common-mode variation.
Design the analog front end around the selected PGA, reference voltage, input range, and desired data rate. Keep input and reference routing compact, decouple supply rails near the device, and provide a clean low-noise ground strategy. SSOP lead pitch also demands careful solderability and inspection planning.
This page consolidates verified manufacturer information, distributor availability, procurement data, and engineering guidance. It also separates exact sourced facts from parameters requiring design confirmation instead of filling unsupported values with assumptions.
Drop-in alternatives for ADS1255IDBR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ADS1255IDBR (same form factor and footprint) — differing in Package, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS1255IDBT
✅ Drop-In📋 Reference alternative (not in catalog)
ADS1255IDBTG4
✅ Drop-In📋 Reference alternative (not in catalog)
ADS1255IDBRG4
✅ Drop-In📋 Reference alternative (not in catalog)
ADS1255IDBR Maximum Ratings & Electrical Characteristics
| ADC Type | 24-bit delta-sigma ADC |
| Resolution | 24 bit |
| Maximum Data Rate | 30 kSPS |
| Noise-Free Resolution | Up to 23 bit at all data rates and PGA settings |
| Input Type | Differential or single-ended |
| Number of Analog Inputs | 2 |
| Input Multiplexer | Flexible differential or single-ended input selection |
| Modulator Order | Fourth-order delta-sigma |
| Digital Filter | Programmable |
| Nonlinearity | ±0.0010% maximum |
| Missing Codes | No missing codes |
| Channel Cycling | Fast channel cycling |
| PGA | Programmable |
| Interface | Serial interface |
| Supply Voltage | 5 V |
| Package | 20-SSOP |
| Mounting Type | Surface mount |
| RoHS Status | RoHS compliant |
ADS1255IDBR 20-ssop Pin Configuration Guide
Pin configuration for ADS1255IDBR (20-ssop package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for ADS1255IDBR.
Refer to the datasheet for full pin configuration.
Typical Applications
ADS1255IDBR is suitable for 7 applications: Load-Cell Front Ends, Precision Pressure Instrumentation, Industrial Sensor Acquisition, Laboratory Measurement Equipment, Temperature and Resistance Measurement, Battery and Power-System Monitoring, Communication and Sensor Interfaces.
Load-Cell Front Ends
The ADS1255IDBR fits load-cell and strain-gauge measurements because it combines 24-bit resolution with differential input capability and noise-free resolution of up to 23 bits. Place it behind the bridge amplifier or excitation circuit, use the internal PGA to match the small bridge output, and configure a suitable data rate for mechanical bandwidth. The fourth-order delta-sigma modulator and programmable filter can reject noise, but frontend excitation, input protection, reference stability, and PCB cleanliness determine whether the converter reaches its intended measurement resolution.
Recommended
Precision Pressure Instrumentation
For pressure transmitters and resistive bridges, the ADS1255IDBR provides a 24-bit conversion word, two analog inputs, differential operation, and programmable gain for low-level millivolt signals. The selectable input arrangement can support redundant or switched channels, while the flexible input multiplexer simplifies analog routing. At the maximum 30kSPS output rate, the programmable digital filter can trade output rate against averaging and usable resolution. The transducer, excitation source, reference, and analog filter must remain stable to preserve calibration performance.
Recommended
Industrial Sensor Acquisition
The ADS1255IDBR is appropriate for industrial measurement systems that need high resolution rather than extreme throughput. Differential inputs help reject noise present on long sensor wiring, and the two-input multiplexer supports fast channel cycling when multiple transducers must be scanned. Configure the PGA and digital filter for the required signal bandwidth, then isolate the analog route from motors, relays, and switching converters. The converter’s 30kSPS ceiling provides ample rate for many pressure, temperature, and level sensors while retaining a high-resolution measurement path.
Recommended
Laboratory Measurement Equipment
Laboratory instruments can use the ADS1255IDBR to digitize low-level analog signals with 24-bit nominal resolution and up to 30kSPS output data. The programmable digital filter allows the system to select an appropriate conversion rate and settling behavior, while differential input supports instrumentation architectures. For a precision bench front end, use a stable reference and low-noise supply, provide adequate input settling time for the selected PGA, and calibrate gain and offset over the intended temperature range. The result is a flexible measurement channel rather than a fixed, single-purpose converter.
Recommended
Temperature and Resistance Measurement
The ADS1255IDBR can serve temperature, resistance, and other slow-but-accurate measurement channels where low noise matters more than high sample throughput. Use the two analog inputs with the flexible multiplexer to measure a sensor plus a reference or compensation channel. Differential operation can cancel common-mode offsets, and the programmable PGA and digital filter help match the converter to the sensor’s resistance, noise, and bandwidth. For RTDs or resistive bridges, verify excitation voltage, self-heating, reference accuracy, and input settling before interpreting conversion resolution as usable temperature accuracy.
Recommended
Battery and Power-System Monitoring
The ADS1255IDBR is suitable for precision monitoring of slow-varying power-system quantities when the analog front end scales the voltage into its input range. Differential measurement can observe a divided voltage across a power rail or shunt-derived signal, while the reference channel may support correction if routed appropriately. The 30kSPS maximum data rate is more than adequate for many supervisory measurements. Keep high-current switching paths away from the analog input and reference nodes, and confirm that the selected PGA, input range, and sampling schedule meet the required settling and fault-response requirements.
Recommended
Communication and Sensor Interfaces
The converter can serve as the sensing element in communications equipment that monitors temperature, supply condition, bias, or another slowly varying analog quantity. Its serial interface, 24-bit resolution, two analog inputs, and flexible input multiplexer allow a compact controller to configure the measurement and retrieve filtered results. Choose a data rate that matches the monitored variable and the control-loop latency. For remote cable-connected sensors, protect the input pins, maintain a low-impedance reference path, and use differential wiring to reduce common-mode pickup before conversion begins.
Recommended
Recommended Products Summary
Engineering reference data for ADS1255IDBR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS1255IDBT | ADS1255IDBTG4 | ADS1255IDBRG4 |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 20-SSOP | 20-SSOP | 20-SSOP | 20-SSOP |
| ADC Resolution | 24 bit | 24 bit | 24 bit | 24 bit |
| Maximum Data Rate | 30 kSPS | 30 kSPS | 30 kSPS | 30 kSPS |
| Input Type | Differential or single-ended | Differential or single-ended | Differential or single-ended | Differential or single-ended |
| Analog Inputs | 2 | 2 | 2 | 2 |
| Modulator Architecture | Fourth-order delta-sigma | Fourth-order delta-sigma | Fourth-order delta-sigma | Fourth-order delta-sigma |
Key Differentiators
- 24-bit nominal resolution with up to 23-bit noise-free resolution (vs ADS1255IDBT)
- 30kSPS maximum output data rate (vs ADS1255IDBTG4)
- Flexible two-input differential or single-ended architecture (vs ADS1255IDBRG4)
- Programmable fourth-order delta-sigma filtering for noise management (vs ADS1256IDBTG4)
Design Notes
Use a differential analog path when the sensor allows it, and route the pair to the converter with similar geometry and a continuous nearby ground reference. Keep the input traces short relative to the selected data rate, especially when the PGA uses a high gain. The verified architecture supports differential and single-ended inputs, but the actual noise result depends on source impedance, input filtering, reference quality, and layout return paths rather than on the nominal 24-bit width alone.
Provide a stable low-noise supply and reference implementation around the converter. The verified device operates from 5V, but its usable measurement resolution can be reduced by supply ripple, reference drift, ground bounce, or inadequate input settling. Decouple the supply near the device, use a low-noise reference appropriate for the required accuracy, and verify the selected data rate against the source impedance and PGA setting. Treat the reference as a measurement input, not merely a voltage for internal conversion.
The 20-SSOP package has narrow leads and requires attention to land-pattern accuracy, paste volume, reflow profile, and inspection. Match the PCB footprint and pin numbering to the exact manufacturer ordering code before release. Keep analog components and routing on the same clean region, separate digital control and serial activity from sensitive input and reference nodes, and provide test access for calibration and debugging without introducing long probe loops into the measurement path.
Do not interpret the nominal 24-bit resolution as guaranteed system accuracy. The verified datasheet reports up to 23-bit noise-free resolution across data rates and PGA settings, while gain, offset, nonlinearity, reference error, excitation error, and front-end noise contribute additional system limitations. Establish the allowable error, select the PGA and data rate deliberately, allow sufficient settling time, and calibrate gain and offset over the intended temperature and supply ranges.
Compliance Information
The supplied Xecor comparison states that ADS1255IDBT is RoHS compliant, while the ADS1255IDBR-specific supplied snippets do not provide a complete compliance matrix. REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals status are therefore unknown.
