Part A
ADS1254E/2K5
Техасские инструменты
- Lifecycle
- Active
- Stock
- 4500 ПКС
- Package
- SSOP-20
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1254E/2K5 and ADS1256IDBTG4 are both 24-bit delta-sigma ADCs, but they differ fundamentally in channel count, interface protocol, package footprint, and reference architecture. The ADS1254E/2K5 is a 4-channel device with a serial SPI-compatible interface in a 20-pin SSOP, while the ADS1256IDBTG4 offers 8 channels with a flexible SPI interface and integrated input buffer in a 28-pin TSSOP. These differences in channel density, pinout, and analog front-end architecture prevent direct board-level substitution without redesign.
Different channel count
Different package footprint
Different input architecture
Different reference configuration
Parts at a glance
Part B
ADS1256IDBTG4
Техасские инструменты
- Lifecycle
- Active
- Stock
- 7819 ПКС
- Package
- SSOP-28
- Series
- Сбор данных - аналогово-цифровые преобразователи (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 | ADS1254E/2K5 | ADS1256IDBTG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution alone does not differentiate them for substitutability. |
| Number of input channels | 4 (single-ended) | 8 (4 differential / 8 single-ended) | Channel count and configuration determine how many signals can be measured and whether differential inputs are available. |
| Maximum sample rate (SPS) | 20k | 30k | Sample rate limits the bandwidth of signals that can be digitized and affects throughput in the application. |
| Interface | SPI (serial) | SPI (serial) | Both use SPI, so the host microcontroller interface is compatible, easing drop-in replacement. |
| Supply voltage (analog) | 5 V | 5 V | Matching analog supply voltage ensures the same signal range and reference headroom in the target design. |
| Package | 20-SSOP | 28-SSOP | Different package footprints require PCB layout changes, affecting direct board-level substitutability. |
| PGA / gain amplifier | No (fixed gain) | Yes (programmable gain 1–64) | A programmable gain amplifier allows direct connection of low-level sensors without external conditioning circuitry. |
| Input type | Single-ended | Differential / single-ended | Differential inputs improve noise rejection and are needed for many precision sensor and bridge applications. |
| Operating temperature range | -40°C to +85°C | -40°C to +85°C | Identical temperature ratings mean both suit the same industrial environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1254E/2K5 | ADS1256IDBTG4 |
|---|---|---|
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 20k | 30k |
| Number of Inputs | 4 | 4, 8 |
| Input Type | Differential | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-ADC | MUX-PGA-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 | 1.8V ~ 3.6V |
| Features | - | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the ADS1254E/2K5 and the ADS1256IDBTG4?
The ADS1254E/2K5 is a 24-bit delta-sigma ADC with a fixed input configuration and a maximum data rate of 20 kSPS, housed in a 20-pin QSOP package. The ADS1256IDBTG4 is a 24-bit delta-sigma ADC featuring a flexible 4-channel differential or 8-channel single-ended input multiplexer, a programmable gain amplifier (PGA) with gains from 1 to 64, and a maximum data rate of 30 kSPS, housed in a 28-pin TSSOP package.
Are the ADS1254E/2K5 and ADS1256IDBTG4 pin-to-pin or package compatible?
No. The ADS1254E/2K5 uses a 20-pin QSOP package, while the ADS1256IDBTG4 uses a 28-pin TSSOP package. The pin counts, pin functions, and PCB land patterns differ, so they are not direct drop-in replacements.
How do the input configurations of these two ADCs differ?
The ADS1254E/2K5 provides a fixed input structure without an integrated input multiplexer or PGA. The ADS1256IDBTG4 includes an input multiplexer supporting 4 differential or 8 single-ended channels and an integrated PGA with selectable gains of 1, 2, 4, 8, 16, 32, and 64.
What are the maximum data rates of the ADS1254E/2K5 and ADS1256IDBTG4?
The ADS1254E/2K5 supports a maximum data rate of 20 kSPS. The ADS1256IDBTG4 supports a maximum data rate of 30 kSPS.
Do both devices support the same digital interface?
Both devices use an SPI-compatible serial interface for communication with a host controller. However, the register set, command structure, and configuration options differ between the two devices, so firmware must be adapted accordingly.
Can the ADS1254E/2K5 be replaced by the ADS1256IDBTG4 in an existing design?
Not without redesign. The differences in package footprint, pinout, input multiplexing, PGA availability, and register map mean the replacement requires PCB layout changes and firmware modifications, followed by full validation against the ADS1256IDBTG4 datasheet.
Which device is better suited for multi-channel sensor applications?
The ADS1256IDBTG4 is better suited for multi-channel applications because it integrates an input multiplexer for 4 differential or 8 single-ended channels and a PGA, whereas the ADS1254E/2K5 has a fixed input configuration without these features.