Part A
ADS1255IDBR
Texas Instruments
- Lifecycle
- Active
- Stock
- 2109 Stückzahl
- Package
- SSOP-20
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1255IDBR and ADS1213E/1KG4 are both 24-bit delta-sigma ADCs, but they differ in resolution architecture, interface type, package footprint, and reference configuration, so they are not interchangeable without a full board redesign. The ADS1255IDBR offers a single-channel, SPI-compatible, low-noise conversion path in a small TSSOP package, while the ADS1213E/1KG4 provides a four-channel, I2C-capable converter in a wider SOIC package with a different reference and clocking arrangement. Designers must revalidate the analog front end, digital interface, and layout before considering any substitution.
Different channel count
Different digital interface
Different package footprint
Different reference configuration
Parts at a glance
Part B
ADS1213E/1KG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 8128 Stückzahl
- Package
- SSOP-28
- Series
- Datenerfassung mit 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 | ADS1213E/1KG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 22 | Higher resolution provides finer measurement granularity; a 24-bit ADC resolves smaller signal changes than a 22-bit device. |
| Maximum Sample Rate (SPS) | 30k | 6.25k | Sample rate determines the highest signal bandwidth that can be captured; faster sampling supports higher-frequency inputs. |
| Number of Input Channels | 2 (differential) | 4 (differential) | Channel count affects how many independent signals can be measured without external multiplexing. |
| Interface Type | SPI | SPI | Both use SPI, so the host microcontroller interface is compatible, but register maps and command sets differ. |
| Supply Voltage (analog) | 5 V | 5 V | Analog supply voltage must match the system rail; both operate from a 5 V analog supply. |
| Package | SSOP-20 | SSOP-28 | Package footprint and pin count must match the PCB layout; different packages are not drop-in compatible. |
| Input Type | Differential | Differential | Differential inputs reject common-mode noise; both support differential measurement topologies. |
| PGA Gain Range | 1 to 64 | 1 to 128 | Programmable gain amplifies small signals; a wider gain range allows measurement of lower-level inputs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1255IDBR | ADS1213E/1KG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| 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 key architectural differences between the ADS1255IDBR and the ADS1213E/1KG4?
The ADS1255IDBR is a 24-bit delta-sigma ADC with a single-channel differential input, programmable gain amplifier, and SPI interface, housed in a TSSOP-20 package. The ADS1213E/1KG4 is a 22-bit delta-sigma ADC featuring a 4-channel differential input multiplexer, PGA, and SPI interface, supplied in a TQFP-28 package. The ADS1255 offers higher resolution (24-bit vs 22-bit), while the ADS1213 provides more input channels (4 differential vs 1 differential).
Are the ADS1255IDBR and ADS1213E/1KG4 pin-compatible or package-compatible?
No. The ADS1255IDBR uses a TSSOP-20 package, while the ADS1213E/1KG4 uses a TQFP-28 package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements and require separate PCB layouts.
How do the data output rates compare between the two devices?
The ADS1255IDBR supports programmable data output rates up to 30 kSPS. The ADS1213E/1KG4 supports programmable data output rates up to 6.25 kSPS. The ADS1255 therefore offers a higher maximum output rate, making it more suitable for higher-speed measurement applications.
What are the differences in input channel configuration between the ADS1255IDBR and ADS1213E/1KG4?
The ADS1255IDBR provides a single differential input channel (two analog inputs configurable as differential). The ADS1213E/1KG4 provides a 4-channel differential input multiplexer, allowing selection among four differential input pairs. The ADS1213 is preferable when multiple analog signals must be measured by a single ADC.
Do both devices support the same digital interface for microcontroller connection?
Yes. Both the ADS1255IDBR and ADS1213E/1KG4 use an SPI-compatible serial interface for communication with a host microcontroller or DSP. However, register maps, command sets, and timing specifications differ, so firmware must be adapted accordingly.
How do the supply voltage requirements of the ADS1255IDBR and ADS1213E/1KG4 compare?
The ADS1255IDBR operates from a single 5 V analog supply (with a separate digital supply). The ADS1213E/1KG4 also operates from a 5 V analog supply with a separate digital supply. Both require careful decoupling and layout to achieve specified noise performance, but exact supply ranges and current consumption should be confirmed in the respective manufacturer datasheets.
Which device is better suited for high-resolution, low-speed precision measurement?
The ADS1255IDBR is better suited for high-resolution precision measurement because it provides 24-bit resolution and up to 30 kSPS output rate with a single differential input. The ADS1213E/1KG4 offers 22-bit resolution and up to 6.25 kSPS with a 4-channel multiplexer, making it more appropriate for multi-channel, lower-resolution applications.
Can the ADS1255IDBR and ADS1213E/1KG4 be used interchangeably in an existing design?
No. Differences in resolution (24-bit vs 22-bit), input channel count (1 differential vs 4 differential), package (TSSOP-20 vs TQFP-28), maximum output rate (30 kSPS vs 6.25 kSPS), and register/command sets prevent direct interchangeability. A redesign of the PCB layout and firmware is required when substituting one for the other.