Part A
ADS1254E/2K5
텍사스 인스트루먼트(주)
- Lifecycle
- Active
- Stock
- 4500 PCS
- Package
- SSOP-20
- Series
- 데이터 수집 - 아날로그 변환기(ADC)
Replacement verdict
Not a drop-in replacement
The ADS1254E/2K5 and ADS1241EG4 are not drop-in replacements for one another. Although both are 24-bit delta-sigma analog-to-digital converters from Texas Instruments, they differ in resolution architecture, input channel configuration, package footprint, and digital interface, so a direct board-level substitution is not possible without redesign.
Different channel count
Different package footprint
Different digital interface
Different input configuration
Parts at a glance
Part B
ADS1241EG4
텍사스 인스트루먼트(주)
- Lifecycle
- Active
- Stock
- 9680 PCS
- Package
- SSOP-28
- Series
- 데이터 수집 - 아날로그 변환기(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 | ADS1241EG4 | 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 (differential) | 8 (single-ended) / 4 (differential) | Channel count determines how many sensor inputs can be multiplexed; the ADS1241 offers more single-ended inputs. |
| Maximum sample rate (SPS) | 20k | 15 | Sample rate affects the ability to capture fast-changing signals; the ADS1254 is far faster than the ADS1241. |
| Interface type | SPI (serial) | SPI (serial) | Both use a serial SPI interface, easing drop-in replacement from a digital host perspective. |
| Supply voltage (analog) | 5 V | 2.7 V to 5.25 V | The ADS1241 supports a wider analog supply range, allowing operation in lower-voltage systems where the ADS1254 cannot. |
| PGA (programmable gain amplifier) | No | Yes (gain 1 to 128) | An integrated PGA allows direct amplification of small sensor signals, which the ADS1254 lacks, affecting low-level signal measurement. |
| Package type | SSOP-20 | SSOP-28 | Different package footprints and pin counts prevent direct board-level substitution without layout changes. |
| Operating temperature range | -40°C to +85°C | -40°C to +85°C | Identical temperature ratings mean both suit the same industrial environments. |
| Input type | Differential | Differential / single-ended | The ADS1241 supports both single-ended and differential inputs, offering more flexibility than the differential-only ADS1254. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1254E/2K5 | ADS1241EG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 20k | 15 |
| Number of Inputs | 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 | 2.7V ~ 3.3V, 5V |
| Voltage - Supply, Digital | 1.8V ~ 3.6V | 2.7V ~ 5.25V |
| 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 ADS1241EG4?
The ADS1254E/2K5 is a 24-bit delta-sigma ADC with a fixed gain of 1 and a maximum data rate of 20 kSPS, housed in a 20-pin QSOP package. The ADS1241EG4 is a 24-bit delta-sigma ADC featuring a programmable gain amplifier (PGA) with gains from 1 to 128, a maximum data rate of 1 kSPS, and is supplied in a 28-pin SSOP package. The ADS1254E/2K5 targets higher-speed, low-level signal acquisition, while the ADS1241EG4 targets lower-speed, high-resolution measurements of small signals via its PGA.
Are the ADS1254E/2K5 and ADS1241EG4 pin-to-pin or package compatible?
No. The ADS1254E/2K5 uses a 20-pin QSOP package, whereas the ADS1241EG4 uses a 28-pin SSOP package. The pin counts, package dimensions, and pin functions differ, so they are not drop-in replacements and require different PCB footprints.
How do the input configurations of the ADS1254E/2K5 and ADS1241EG4 differ?
The ADS1254E/2K5 provides a fixed gain of 1 and supports differential input configurations without an integrated PGA. The ADS1241EG4 includes an on-chip PGA with selectable gains of 1, 2, 4, 8, 16, 32, 64, and 128, allowing direct connection of low-level sensors without external amplification. This makes the ADS1241EG4 better suited for small-signal measurements, while the ADS1254E/2K5 is suited for higher-speed, full-scale input acquisition.
What are the maximum data rates of the ADS1254E/2K5 and ADS1241EG4?
The ADS1254E/2K5 supports a maximum data rate of 20 kSPS. The ADS1241EG4 supports a maximum data rate of 1 kSPS. The ADS1254E/2K5 is therefore preferable for higher-speed sampling applications, while the ADS1241EG4 is intended for lower-speed, high-resolution measurements.
Do the ADS1254E/2K5 and ADS1241EG4 support the same digital interface?
Both devices provide a serial digital interface for communication with a host controller. However, the exact interface timing, register set, and command structure differ between the two products, so firmware and interface logic must be designed according to each device's respective datasheet rather than assumed to be interchangeable.
Can the ADS1254E/2K5 be replaced by the ADS1241EG4 in an existing design without changes?
No. Because the two devices differ in package (20-pin QSOP vs 28-pin SSOP), maximum data rate (20 kSPS vs 1 kSPS), and input architecture (fixed gain vs PGA), a direct replacement is not possible. Any substitution requires a new PCB layout, updated firmware, and validation against the target system's speed and signal-conditioning requirements.
Which device is more suitable for low-level sensor signals, the ADS1254E/2K5 or the ADS1241EG4?
The ADS1241EG4 is more suitable for low-level sensor signals because it integrates a PGA with gains up to 128, enabling direct amplification of small differential signals. The ADS1254E/2K5 has a fixed gain of 1 and would typically require external amplification for very low-level inputs, but it offers a higher maximum data rate of 20 kSPS for faster acquisition needs.