Part A
ADS1241E
德州儀器
- Lifecycle
- Active
- Stock
- 1322 件
- Package
- SSOP-28
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The ADS1241E and ADS1256IDBRG4 are both 24-bit delta-sigma ADCs, but they differ in resolution architecture, channel count, interface type, and package footprint, so the ADS1256IDBRG4 cannot serve as a direct drop-in substitute for the ADS1241E without design changes.
Different channel count
Different data rate
Different package footprint
Different interface type
Parts at a glance
Part B
ADS1256IDBRG4
德州儀器
- Lifecycle
- Active
- Stock
- 7726 件
- Package
- SSOP-28
- Series
- 資料獲取-模數轉換器（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 | ADS1241E | ADS1256IDBRG4 | 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 | 8 single-ended / 4 differential | 8 single-ended / 4 differential | Channel count determines how many sensor inputs can be multiplexed without external switching hardware. |
| Maximum sample rate (SPS) | 15 | 30000 | The ADS1256 supports far higher throughput, enabling faster data acquisition and wider signal bandwidth than the ADS1241. |
| Programmable gain amplifier (PGA) range | 1 to 128 | 1 to 64 | PGA range sets the smallest input signal that can be amplified to full scale; the ADS1241 offers a higher maximum gain. |
| Supply voltage (analog) | 2.7 V to 5.25 V | 5 V (4.75 V to 5.25 V) | The ADS1241 operates over a wider low-voltage range, while the ADS1256 requires a regulated 5 V analog supply. |
| Digital interface | SPI (compatible) | SPI | Both use an SPI-compatible serial interface, simplifying drop-in replacement at the digital bus level. |
| Package | SSOP-28 | SSOP-28 | Identical package and pin count allow the same PCB footprint, though pin functions must be verified. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Matching industrial temperature ranges mean both parts suit the same environmental conditions. |
| Internal oscillator | No (external clock required) | Yes (internal oscillator) | The ADS1256 can run without an external clock source, reducing external component count versus the ADS1241. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1241E | ADS1256IDBRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 15 | 30k |
| Number of Inputs | 8 | 4, 8 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| 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 |
| Voltage - Supply, Analog | 2.7V ~ 3.3V, 5V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 1.8V ~ 3.6V |
| Features | PGA | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the ADS1241E and ADS1256IDBRG4?
The ADS1241E is a 24-bit delta-sigma ADC with a single differential input channel (or two single-ended inputs) and a fixed programmable gain amplifier (PGA) range of 1 to 128. The ADS1256IDBRG4 is a 24-bit delta-sigma ADC featuring an 8-channel multiplexer (4 differential or 8 single-ended inputs), a PGA with gains from 1 to 64, and a higher maximum data rate of 30 kSPS compared to the ADS1241E's 15 SPS to 1 kSPS range.
Are the ADS1241E and ADS1256IDBRG4 pin-to-pin compatible?
No. The ADS1241E is offered in a 24-pin TSSOP package, while the ADS1256IDBRG4 is supplied in a 28-pin SSOP package. The pin counts, pin functions, and package footprints differ, so they are not direct drop-in replacements.
How do the maximum data rates of the ADS1241E and ADS1256IDBRG4 compare?
The ADS1241E supports programmable data rates from 15 SPS to 1 kSPS. The ADS1256IDBRG4 supports programmable data rates from 2.5 SPS to 30 kSPS, making it suitable for higher-speed measurement applications.
What are the PGA gain ranges available on each device?
The ADS1241E provides a PGA with selectable gains of 1, 2, 4, 8, 16, 32, 64, and 128. The ADS1256IDBRG4 provides a PGA with selectable gains of 1, 2, 4, 8, 16, 32, and 64. The ADS1241E therefore supports a higher maximum gain of 128.
How many input channels does each ADC support?
The ADS1241E supports one differential input or two single-ended inputs. The ADS1256IDBRG4 includes an input multiplexer supporting four differential inputs or eight single-ended inputs, allowing it to interface with more sensors without external multiplexing.
Do both devices support an SPI-compatible serial interface?
Yes. Both the ADS1241E and ADS1256IDBRG4 provide an SPI-compatible serial interface for configuration and data readout, allowing direct connection to common microcontrollers and digital signal processors.
What are the supply voltage requirements for the ADS1241E and ADS1256IDBRG4?
Both devices operate from a single analog supply of 5 V and a digital supply of 2.7 V to 5.25 V. The ADS1256IDBRG4 additionally supports a bipolar analog supply of ±2.5 V for applications requiring bipolar input ranges.
Which device is better suited for multi-sensor data acquisition systems?
The ADS1256IDBRG4 is generally better suited for multi-sensor systems because its integrated 8-channel multiplexer and higher 30 kSPS data rate allow multiple inputs to be scanned at higher throughput. The ADS1241E is more appropriate for single-channel or low-channel-count precision measurements at lower data rates.