Part A
ADS1255IDBR
Texas Instruments
- Lifecycle
- Active
- Stock
- 2109 PCS
- Package
- SSOP-20
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1255IDBR and ADS1253E/2K5 are both 24-bit delta-sigma ADCs from Texas Instruments, but they differ fundamentally in resolution architecture, input channel configuration, interface protocol, and package footprint. The ADS1255IDBR offers a single differential input with SPI and a TSSOP-20 package, while the ADS1253E/2K5 provides a 2-channel configuration with a different serial interface and a narrower SOIC-style body. Because these differences affect board layout, host firmware, and signal-chain design, the two devices are not functionally interchangeable without a full redesign.
Different channel count
Different interface protocol
Different package footprint
Different input configuration
Parts at a glance
Part B
ADS1253E/2K5
Texas Instruments
- Lifecycle
- Active
- Stock
- 8331 PCS
- Package
- SSOP-16
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS1255IDBR | ADS1253E/2K5 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 16 | Resolution determines the smallest signal change the ADC can resolve; a 24-bit device offers far finer measurement granularity than a 16-bit device. |
| Number of input channels | 2 (1 differential / 2 single-ended) | 1 (differential) | Channel count defines how many signals can be measured; the ADS1255 supports more inputs, enabling multiplexed multi-sensor designs. |
| Maximum sample rate (SPS) | 30k | 20k | Sample rate sets the maximum signal bandwidth that can be captured; higher rates suit faster-changing signals. |
| Interface | SPI | SPI | The digital interface must match the host controller; both use SPI, simplifying drop-in compatibility at the bus level. |
| Supply voltage (analog) | 5 V | 5 V | Analog supply voltage affects input range and noise performance; matching supplies ease substitution in existing rails. |
| Package / mounting | 20-SSOP | 16-SSOP | Package footprint and pin count must match the PCB layout; differing packages require layout changes for substitution. |
| Operating temperature range | -40°C to +85°C | -40°C to +85°C | Temperature range confirms suitability for the target environment; identical ranges mean equivalent environmental tolerance. |
| Input type | Differential / single-ended | Differential | Input configuration affects noise rejection and sensor compatibility; single-ended support adds flexibility for ground-referenced signals. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1255IDBR | ADS1253E/2K5 |
|---|---|---|
| Supplier | - | Texas Instruments,Rochester Electronics, LLC |
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 30k | 20k |
| Number of Inputs | 1, 2 | 4 |
| Input Type | Differential, Single Ended | Differential |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | MUX-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 1.8V ~ 3.6V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Features | PGA | - |
Frequently asked questions
What are the key architectural differences between the ADS1255IDBR and the ADS1253E/2K5?
The ADS1255IDBR is a 24-bit delta-sigma ADC with a single-channel differential input, programmable gain amplifier (PGA), and a maximum data rate of 30 kSPS. The ADS1253E/2K5 is a 24-bit delta-sigma ADC with a 4-channel differential input multiplexer, no PGA, and a maximum data rate of 20 kSPS. The ADS1255 includes an internal PGA and supports gains from 1 to 64, while the ADS1253 does not integrate a PGA.
Are the ADS1255IDBR and ADS1253E/2K5 pin-compatible or package-compatible?
No. The ADS1255IDBR is supplied in a 20-pin SSOP (DB) package, while the ADS1253E/2K5 is supplied in a 20-pin SSOP (DB) package as well, but the pin functions differ between the two devices. The ADS1255 and ADS1253 have different pin assignments, so they are not drop-in replacements despite sharing the same package footprint.
How do the input configurations of the ADS1255IDBR and ADS1253E/2K5 differ?
The ADS1255IDBR provides a single differential input channel (two analog inputs) with an integrated PGA. The ADS1253E/2K5 provides a 4-channel differential input multiplexer, allowing selection among four differential input pairs, but it does not include an integrated PGA. This makes the ADS1253 better suited for multi-channel multiplexed systems, while the ADS1255 is suited for single-channel high-resolution measurements requiring gain.
What are the maximum data rates of the ADS1255IDBR and ADS1253E/2K5?
The ADS1255IDBR supports programmable data rates up to 30 kSPS. The ADS1253E/2K5 supports data rates up to 20 kSPS. Both devices are delta-sigma converters, and their data rates are configured through their respective serial interfaces.
Do both devices support the same serial interface for communication?
Both devices use an SPI-compatible serial interface. The ADS1255IDBR provides a serial peripheral interface with additional control pins including DRDY, CS, SCLK, DIN, and DOUT. The ADS1253E/2K5 also uses an SPI-compatible interface with similar signal lines. However, the register maps and command sets differ between the two devices, so firmware cannot be reused without modification.
Can the ADS1255IDBR directly replace the ADS1253E/2K5 in an existing design?
No. Although both are 24-bit delta-sigma ADCs in 20-pin SSOP packages, they differ in pin assignments, input multiplexing, PGA availability, register maps, and maximum data rate. A direct replacement is not possible without redesigning the analog front end, updating the PCB layout, and modifying firmware to match the respective device's command set and register configuration.
Which device is more suitable for multi-channel sensor applications?
The ADS1253E/2K5 is more suitable for multi-channel sensor applications because it integrates a 4-channel differential input multiplexer, allowing multiple sensor inputs to be sequenced through a single ADC. The ADS1255IDBR has only a single differential input channel and would require external multiplexing circuitry for multi-channel applications.
How do the power supply requirements of the ADS1255IDBR and ADS1253E/2K5 compare?
Both devices operate from a single 5 V analog supply (AVDD) and a 1.8 V to 3.6 V digital supply (DVDD) for the ADS1255, while the ADS1253 operates from a 5 V analog supply and a 2.7 V to 5.25 V digital supply. Designers should consult the respective manufacturer datasheets for exact supply voltage ranges and decoupling requirements before finalizing power supply designs.