Part A
ADS1255IDBR
Texas Instruments
- Lifecycle
- Active
- Stock
- 2109 PCS
- Package
- SSOP-20
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1255IDBR and ADS1213EG4 are both 24-bit delta-sigma ADCs, but they differ fundamentally in resolution architecture, interface protocol, package footprint, and reference/supply configuration, so the ADS1213EG4 cannot serve as a direct drop-in substitute for the ADS1255IDBR without redesign and validation.
Different interface protocol
Different package footprint
Different input channel configuration
Different reference and supply architecture
Parts at a glance
Part B
ADS1213EG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 7697 PCS
- Package
- SSOP-28
- Series
- Data Acquisition - Analog to Digital Converters (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 | ADS1213EG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 22 | Higher resolution provides finer measurement granularity and lower quantization noise, which is critical for precision sensor and instrumentation applications. |
| Maximum Sample Rate (SPS) | 30k | 6.25k | The maximum output data rate determines how fast the converter can capture signals; a higher rate supports wider-bandwidth or multiplexed measurement systems. |
| Number of Input Channels | 2 (differential) | 4 (differential) | Channel count determines how many independent signals can be measured without external multiplexing, affecting system complexity and board space. |
| Interface Type | SPI | SPI | The digital interface must match the host microcontroller or FPGA; both use SPI here, but timing and register protocols differ and must be verified for drop-in compatibility. |
| Supply Voltage (Analog) | 5 V | 5 V | Analog supply voltage sets the input range and must be compatible with the sensor front end and reference circuitry. |
| Package Type | SSOP-20 | SOIC-20 | Package footprint and pinout must match the PCB layout; different packages require layout redesign and affect thermal and assembly considerations. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | The temperature range must cover the application environment to ensure specified accuracy and reliability over the operating conditions. |
| Input Type | Differential | Differential | Differential inputs reject common-mode noise and are essential for low-level signal measurement; matching input topology ensures signal-chain compatibility. |
| Internal PGA | Yes (1 to 64) | Yes (1 to 128) | An internal programmable gain amplifier allows direct connection of low-level sensors without external amplification; the gain range affects achievable sensitivity. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1255IDBR | ADS1213EG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | 24 | 22 |
| Sampling Rate(Per Second) | 30k | 6.25k |
| Number of Inputs | 1, 2 | 4 |
| Input Type | Differential, Single Ended | Differential |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | MUX-PGA-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External, Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 1.8V ~ 3.6V | 5V |
| Features | PGA | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary differences between the ADS1255IDBR and the ADS1213EG4?
The ADS1255IDBR is a 24-bit delta-sigma ADC with a maximum data rate of 30 kSPS, housed in a 20-pin SSOP package, and specified over the -40°C to +85°C temperature range. The ADS1213EG4 is a 22-bit delta-sigma ADC with a maximum data rate of 6.25 kSPS, housed in a 28-pin SOIC package, and specified over the -40°C to +85°C temperature range. The ADS1255 offers higher resolution and faster throughput, while the ADS1213 provides a different channel and interface configuration.
Are the ADS1255IDBR and ADS1213EG4 pin-to-pin compatible?
No. The ADS1255IDBR uses a 20-pin SSOP package, while the ADS1213EG4 uses a 28-pin SOIC package. The pin counts, package dimensions, and pin functions differ, so they are not drop-in replacements and require different PCB land patterns.
What are the maximum data rates of the ADS1255IDBR and ADS1213EG4?
The ADS1255IDBR supports a maximum data rate of 30 kSPS. The ADS1213EG4 supports a maximum data rate of 6.25 kSPS. The ADS1255 therefore provides approximately 4.8 times the maximum throughput of the ADS1213.
What resolution does each ADC provide?
The ADS1255IDBR is a 24-bit delta-sigma ADC. The ADS1213EG4 is a 22-bit delta-sigma ADC. The ADS1255 provides two additional bits of resolution compared with the ADS1213.
Do both devices support the same digital interface?
Both devices provide a serial digital interface for communication with a host controller. However, the specific interface protocol, register set, and command structure differ between the ADS1255 and ADS1213, so firmware and driver code are not interchangeable without modification.
What are the supply voltage requirements for the ADS1255IDBR and ADS1213EG4?
The ADS1255IDBR operates from a single 5 V analog supply with a separate 1.8 V to 3.6 V digital supply. The ADS1213EG4 operates from a single 5 V supply. Designers should confirm exact supply rail requirements against the respective manufacturer datasheets before finalizing the power architecture.
Can the ADS1255IDBR be used as a direct substitute for the ADS1213EG4 in an existing design?
No. Because the two devices differ in package, pin count, resolution, maximum data rate, and interface protocol, a direct substitution is not possible. Any replacement requires a PCB redesign, firmware changes, and full validation against the target system requirements.
Which device is better suited for high-resolution, low-speed precision measurement?
The ADS1255IDBR offers 24-bit resolution and up to 30 kSPS, making it suitable for higher-resolution and higher-throughput precision measurement. The ADS1213EG4 offers 22-bit resolution at up to 6.25 kSPS, which may be adequate for lower-speed applications. Selection should be based on the required resolution, data rate, and interface compatibility of the target design.