Part A
ADS124S08IPBSR
Техасские инструменты
- Lifecycle
- Active
- Stock
- 4103 ПКС
- Package
- TQFP-32
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1294IPAG and ADS124S08IPBSR are not drop-in replacements for one another. The ADS1294IPAG is a four-channel simultaneous-sampling biopotential front end with integrated programmable gain amplifiers and a delta-sigma modulator, while the ADS124S08IPBSR is a multiplexed 12-channel precision delta-sigma ADC. They differ in channel architecture, package footprint, and target application domain, so direct substitution is not feasible without a full system redesign.
Different channel architecture
Different package footprint
Different input configuration
Different application domain
Parts at a glance
Part B
ADS1294IPAG
Техасские инструменты
- Lifecycle
- Active
- Stock
- 1382 ПКС
- Package
- TQFP-64
- Series
- Сбор данных - аналоговый фронт-энд (AFE)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS1294IPAG | ADS124S08IPBSR | Why it matters |
|---|---|---|---|
| Number of input channels | 4 differential (8 single-ended) | 12 single-ended / 6 differential | Channel count determines how many sensor signals can be acquired simultaneously; a substitute must cover the required channel count. |
| Resolution | 24-bit | 24-bit | Both are 24-bit delta-sigma ADCs, so resolution alone does not differentiate them for precision sensing. |
| Maximum data rate | 32 kSPS per channel | 4 kSPS | Higher sample rates support faster signal bandwidth; the ADS1294 offers significantly higher throughput for dynamic signals. |
| Integrated PGA | Yes (gain 1 to 12) | Yes (gain 1 to 128) | PGA gain range affects the ability to amplify small sensor signals; the ADS124S08 supports much higher gains for low-level inputs. |
| Integrated features | Built-in ECG/EEG front-end, lead-off detection, respiration, internal reference | Internal reference, IDACs, sensor biasing, GPIO | On-chip features reduce external component count; the ADS1294 targets biopotential acquisition while the ADS124S08 targets general precision sensing. |
| Supply voltage (analog) | 2.7 V to 5.25 V (unipolar) / ±2.5 V (bipolar) | 2.7 V to 5.25 V (unipolar) / ±2.5 V (bipolar) | Compatible supply ranges allow similar power rail design, easing drop-in substitution. |
| Interface | SPI (up to 20 MHz) | SPI (up to 10 MHz) | SPI is the digital host interface; the ADS1294 supports a faster clock, which matters for high-throughput systems. |
| Package | 64-pin TQFP (PAG) | 32-pin TQFP (PBS) | Package footprint and pin count affect PCB layout; these parts are not pin-compatible and require board redesign. |
| Typical application focus | ECG, EEG, EMG, biopotential monitoring | Precision sensor measurement, temperature, pressure, industrial | Target application indicates whether the part's feature set and noise profile suit the intended signal chain. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS124S08IPBSR | ADS1294IPAG |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 4k | - |
| Number of Inputs | 12 | - |
| Input Type | Single Ended | - |
| Data Interface | SPI | - |
| Configuration | MUX-PGA-ADC | - |
| Ratio - S / H: ADC | 0:1 | - |
| Number of A/D Converters | 1 | - |
| Architecture | Sigma-Delta | - |
| Reference Type | External, Internal | - |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V | 1.65V ~ 3.6V |
| Features | PGA | - |
| Operating Temperature | -50°C ~ 125°C | - |
| Number of Channels | - | 4 |
| Power (Watts) | - | 10.1 mW |
| Mounting Type | - | Surface Mount |
Frequently asked questions
What are the primary functional differences between the ADS1294IPAG and the ADS124S08IPBSR?
The ADS1294IPAG is a 4-channel, 24-bit delta-sigma analog front-end (AFE) designed primarily for biopotential measurements such as ECG and EEG, integrating a programmable gain amplifier, internal reference, and lead-off detection. The ADS124S08IPBSR is an 8-channel, 24-bit delta-sigma ADC intended for precision sensor and industrial measurement applications, featuring a programmable gain amplifier, internal reference, and sensor excitation options such as IDACs. The ADS1294IPAG is optimized for simultaneous multi-channel biopotential acquisition, while the ADS124S08IPBSR is optimized for general-purpose precision analog-to-digital conversion.
Do the ADS1294IPAG and ADS124S08IPBSR have the same package and pinout?
No. The ADS1294IPAG is supplied in a 64-pin TQFP package, while the ADS124S08IPBSR is supplied in a 32-pin TQFP package. Because the package sizes and pin counts differ, the two devices are not pin-compatible and cannot be interchanged on the same PCB land pattern without redesign.
Can the ADS1294IPAG and ADS124S08IPBSR operate from the same supply voltages?
Both devices support analog supply voltages in the range of 2.7 V to 5.25 V and digital supply voltages in the range of 1.65 V to 3.6 V, per their respective manufacturer datasheets. However, the ADS1294IPAG is typically operated with a unipolar analog supply in biopotential systems, while the ADS124S08IPBSR supports both unipolar and bipolar analog supply configurations. Designers should verify the exact supply configuration against the target datasheet before substitution.
Which device is better suited for multi-channel biopotential acquisition such as ECG or EEG?
The ADS1294IPAG is better suited for multi-channel biopotential acquisition. It integrates four simultaneous-sampling 24-bit delta-sigma channels with a programmable gain amplifier, internal reference, and lead-off detection circuitry specifically intended for ECG and EEG front-end designs. The ADS124S08IPBSR is a general-purpose precision ADC and does not integrate biopotential-specific features such as lead-off detection.
Which device is better suited for general-purpose precision sensor measurement?
The ADS124S08IPBSR is better suited for general-purpose precision sensor measurement. It provides eight input channels, a 24-bit delta-sigma ADC, a programmable gain amplifier, an internal reference, and integrated current sources (IDACs) for sensor excitation, making it appropriate for RTD, thermocouple, and bridge sensor applications. The ADS1294IPAG is specialized for biopotential acquisition and offers fewer general-purpose sensor interface features.
Are the ADS1294IPAG and ADS124S08IPBSR drop-in replacements for each other?
No. The two devices differ in channel count (4 vs. 8), package and pin count (64-pin TQFP vs. 32-pin TQFP), integrated feature sets, and target applications. They are not pin-compatible or functionally interchangeable, and a direct drop-in replacement is not possible without PCB redesign and firmware changes.
What are the data output interface options for each device?
Both the ADS1294IPAG and the ADS124S08IPBSR provide an SPI-compatible serial interface for register configuration and data readout. The ADS1294IPAG additionally supports a daisy-chain configuration for multi-device systems, which is useful in multi-channel biopotential acquisition. Designers should confirm the specific interface timing and mode requirements in the respective datasheets.
Do both devices include an internal reference and programmable gain amplifier?
Yes. Both the ADS1294IPAG and the ADS124S08IPBSR integrate an internal voltage reference and a programmable gain amplifier (PGA) as part of their analog front-end architecture. The exact gain ranges and reference specifications differ between the two devices and should be verified against the respective manufacturer datasheets for the target design.