Part A
ADS124S08IPBS
Техасские инструменты
- Lifecycle
- Active
- Stock
- 3448 ПКС
- Package
- TQFP-32
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1294IPAGR and ADS124S08IPBS are not drop-in replacements for one another. The ADS1294IPAGR is a four-channel simultaneous-sampling biopotential front end with integrated programmable gain amplifiers and a delta-sigma modulator, while the ADS124S08IPBS is an eight-channel multiplexed precision delta-sigma ADC without integrated biopotential front-end circuitry. Their channel architecture, input configuration, package footprint, and target application domains differ substantially, so direct substitution is not feasible without redesign.
Different channel architecture
Different input configuration
Different package footprint
Different application focus
Parts at a glance
Part B
ADS1294IPAGR
Техасские инструменты
- Lifecycle
- Active
- Stock
- 4357 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 | ADS1294IPAGR | ADS124S08IPBS | Why it matters |
|---|---|---|---|
| Number of input channels | 4 differential (8 single-ended) | 8 differential (12 single-ended) | Determines how many sensor signals can be acquired simultaneously; a direct constraint on system channel count. |
| Resolution | 24-bit | 24-bit | Both are 24-bit delta-sigma converters, so nominal dynamic range and precision class are comparable. |
| Primary application focus | ECG / biopotential (integrated PGA, RLD, lead-off) | Precision sensor / general-purpose signal acquisition | The ADS1294 includes biopotential-specific features (RLD, lead-off detection) that the ADS124S08 lacks, affecting direct substitutability in medical front-ends. |
| Programmable gain amplifier (PGA) | Integrated PGA, gains 1–12 | Integrated PGA, gains 1–128 | Gain range sets the smallest measurable signal; the wider gain range of the ADS124S08 suits low-level sensor inputs. |
| Data output rate (max) | Up to 32 kSPS | Up to 4 kSPS | Maximum sample rate limits bandwidth and timing resolution; the ADS1294 supports higher throughput for fast waveforms. |
| Supply voltage | Analog 2.7–5.25 V, digital 1.65–3.6 V | Analog 2.7–5.25 V, digital 1.65–3.6 V | Compatible supply rails simplify board-level power design and allow similar operating conditions. |
| Interface | SPI (daisy-chain capable) | SPI | Both use SPI, so host microcontroller connectivity is broadly compatible, though daisy-chain support differs. |
| Package | TQFP-64 (PAG) | TQFP-32 (PBS) | Different footprint and pin count require PCB redesign; not drop-in interchangeable. |
| Integrated features | Internal reference, oscillator, RLD, lead-off detection, respiration | Internal reference, oscillator, IDAC, GPIO | On-chip feature set determines external component count and suitability for specific sensing topologies. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS124S08IPBS | ADS1294IPAGR |
|---|---|---|
| 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 ADS1294IPAGR and the ADS124S08IPBS?
The ADS1294IPAGR is a 4-channel, simultaneous-sampling, 24-bit delta-sigma ADC designed for biopotential measurements such as ECG and EEG, integrating programmable gain amplifiers, internal reference, and respiration impedance measurement. The ADS124S08IPBS is an 8-channel (4 differential/8 single-ended), 24-bit delta-sigma ADC intended for precision sensor and industrial measurement applications, featuring a programmable gain amplifier, internal reference, and sensor excitation current sources. The ADS1294 is application-specific for biopotential signal acquisition, while the ADS124S08 is a general-purpose precision measurement ADC.
Are the ADS1294IPAGR and ADS124S08IPBS pin-to-pin or package compatible?
No. The ADS1294IPAGR is supplied in a 64-pin TQFP package (PAG suffix), while the ADS124S08IPBS is supplied in a 32-pin TQFP package (PBS suffix). The differing pin counts, pin functions, and package footprints prevent direct PCB substitution without a redesign.
How do the input channel configurations of the two devices compare?
The ADS1294IPAGR provides 4 simultaneous-sampling input channels, each with a dedicated PGA and ADC, suited to multi-lead biopotential acquisition. The ADS124S08IPBS provides 8 input channels configurable as 4 differential or 8 single-ended inputs through an input multiplexer, suited to multi-sensor scanning applications. The ADS1294 samples all channels simultaneously, whereas the ADS124S08 multiplexes channels to a single ADC.
Do both devices include an internal reference and PGA?
Yes. Both the ADS1294IPAGR and ADS124S08IPBS integrate a programmable gain amplifier and an internal voltage reference, reducing external component count. Designers should consult the respective datasheets for reference accuracy, drift, and PGA gain range specifications relevant to their application.
Which device is better suited for ECG or EEG signal acquisition?
The ADS1294IPAGR is specifically designed for biopotential acquisition, offering simultaneous multi-channel sampling, low input-referred noise, and integrated features such as lead-off detection and respiration impedance measurement that are relevant to ECG and EEG systems. The ADS124S08IPBS is a general-purpose precision ADC and does not integrate biopotential-specific functions, so the ADS1294IPAGR is the more appropriate choice for ECG/EEG front ends.
Which device is more appropriate for multi-sensor industrial measurement?
The ADS124S08IPBS is better suited to multi-sensor industrial measurement because it provides 8 input channels via a multiplexer, integrated sensor excitation current sources, and a general-purpose precision measurement architecture. The ADS1294IPAGR is optimized for simultaneous biopotential acquisition and is not intended for general multi-sensor scanning.
Can the ADS124S08IPBS replace the ADS1294IPAGR in an existing biopotential design?
No, not as a direct replacement. The ADS124S08IPBS has a different package and pinout, uses a multiplexed rather than simultaneous-sampling architecture, and lacks the biopotential-specific features of the ADS1294IPAGR. Any substitution would require a full schematic and PCB redesign plus validation against the target application requirements.