Part A
ADS114S08IPBS
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 4543 個数
- Package
- TQFP-32
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Not a drop-in replacement
The ADS114S08IPBS and ADS1198CPAGR are not drop-in replacements for one another. The ADS114S08IPBS is a 16-bit, 8-channel precision delta-sigma ADC with an integrated PGA and no ECG-specific front end, while the ADS1198CPAGR is a 16-bit, 8-channel biopotential/ECG analog front end with integrated respiration and lead-off detection. They differ in functional architecture, package footprint, and target application, so substitution requires full schematic and layout redesign plus firmware revalidation.
Different functional architecture
Different package footprint
Different input front end
Different application target
Parts at a glance
Part B
ADS1198CPAGR
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 6691 個数
- Package
- TQFP-64
- Series
- データ取得 - アナログフロントエンド (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 | ADS114S08IPBS | ADS1198CPAGR | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 16 | Both are 16-bit delta-sigma ADCs, so nominal resolution is equivalent for signal-to-noise budgeting. |
| Number of input channels | 8 (single-ended) / 4 (differential) | 8 (differential) | Channel count and configuration determine how many sensors or electrodes can be interfaced directly. |
| Maximum sample rate | 2 kSPS | 8 kSPS | Higher sample rate supports faster signal acquisition and wider signal bandwidth requirements. |
| Programmable gain amplifier (PGA) | Yes (1 to 128 V/V) | Yes (1 to 12 V/V) | PGA gain range affects the ability to resolve small sensor signals without external amplification. |
| Integrated features | PGA, reference, oscillator, IDAC, sensor bias | PGA, reference, oscillator, lead-off detection, respiration | On-chip features reduce external component count and define the target application (biopotential vs general sensor). |
| Supply voltage (analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Compatible analog supply ranges allow similar power rail design and low-voltage operation. |
| Interface | SPI | SPI | Both use SPI, simplifying digital host connection and firmware reuse. |
| Package | TQFP-32 | TQFP-64 | Different package footprints and pin counts affect PCB layout and mechanical compatibility. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +85 °C | Wider temperature range supports harsher environments and industrial applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS114S08IPBS | ADS1198CPAGR |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Number of Channels | - | 8 |
| Power (Watts) | - | 8.2 mW |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V | 1.65V ~ 3.6V |
| Mounting Type | - | Surface Mount |
| Sampling Rate(Per Second) | 4k | - |
| Number of Inputs | 12 | - |
| Input Type | Differential, Pseudo-Differential, Single Ended | - |
| Data Interface | SPI | - |
| Configuration | MUX-PGA-ADC | - |
| Number of A/D Converters | 1 | - |
| Architecture | Sigma-Delta | - |
| Reference Type | External, Internal | - |
| Features | PGA, Temperature Sensor | - |
| Operating Temperature | -50°C ~ 125°C | - |
Frequently asked questions
What are the primary functional differences between the ADS114S08IPBS and the ADS1198CPAGR?
The ADS114S08IPBS is a 16-bit, 8-channel delta-sigma ADC designed for precision sensor measurement, featuring a programmable gain amplifier, internal reference, and SPI interface in a TQFP-32 package. The ADS1198CPAGR is an 8-channel, 16-bit biopotential front-end (AFE) for ECG/EEG applications, integrating PGAs, an internal reference, oscillator, and SPI in a TQFP-64 package. The ADS1198 includes dedicated biopotential signal-chain features such as lead-off detection and respiration measurement, while the ADS114S08 targets general-purpose precision sensing.
Are the ADS114S08IPBS and ADS1198CPAGR pin-to-pin or package compatible?
No. The ADS114S08IPBS is supplied in a 32-pin TQFP (PBS) package, while the ADS1198CPAGR is supplied in a 64-pin TQFP (PAG) package. The differing pin counts and package footprints prevent direct PCB substitution without a redesign of the land pattern and pin routing.
Do both devices support the same number of input channels and resolution?
Both devices provide 8 input channels and 16-bit resolution. However, the ADS114S08IPBS offers a programmable gain amplifier with gains from 1 to 128 for general-purpose sensor inputs, whereas the ADS1198CPAGR integrates PGAs optimized for biopotential signal acquisition with gains of 1, 2, 3, 4, 6, 8, and 12.
Can the ADS1198CPAGR be used for general-purpose precision measurement like the ADS114S08IPBS?
The ADS1198CPAGR is specifically architected as a biopotential AFE for ECG and EEG systems, with features such as lead-off detection, respiration impedance measurement, and a Wilson Central Terminal network. The ADS114S08IPBS is a general-purpose precision ADC intended for temperature, pressure, and bridge sensor applications. Substituting one for the other requires validating the signal chain, gain settings, and integrated features against the target application.
What are the supply voltage and interface differences between the two devices?
Both devices operate from an analog supply of 2.7 V to 5.25 V and a digital supply of 1.8 V to 3.6 V, and both use an SPI-compatible serial interface. The ADS1198CPAGR additionally integrates an on-chip oscillator and supports a daisy-chain configuration for multi-channel biopotential systems, while the ADS114S08IPBS relies on an external clock source or internal oscillator depending on configuration.
Which device is better suited for battery-powered portable medical instrumentation?
The ADS1198CPAGR is purpose-built for portable biopotential instrumentation such as ECG and EEG monitors, integrating the AFE functions needed for those systems. The ADS114S08IPBS is a general-purpose precision ADC suitable for a broad range of low-power sensor applications. Selection depends on whether the application requires dedicated biopotential features or general-purpose precision conversion.
Do the two devices share the same data rate and filter characteristics?
No. The ADS114S08IPBS provides programmable data rates up to 2 kSPS with a digital filter and 50/60 Hz rejection options. The ADS1198CPAGR provides programmable data rates up to 8 kSPS with a digital decimation filter optimized for biopotential signal bandwidths. The filter responses and achievable throughput differ, so timing and noise performance must be re-evaluated when comparing the two.