Part A
ADS114S08IPBS
Texas Instruments
- Lifecycle
- Active
- Stock
- 4543 PCS
- Package
- TQFP-32
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1198CPAG and ADS114S08IPBS are not drop-in replacements for one another. The ADS1198CPAG is an eight-channel, 16-bit biopotential measurement front end with an integrated programmable gain amplifier and a maximum data rate of 8 kSPS, while the ADS114S08IPBS is a sixteen-channel, 16-bit delta-sigma ADC supporting data rates up to 2 kSPS. Their channel counts, package footprints, and target signal chains differ substantially, so substituting one for the other requires a full schematic and layout redesign rather than a direct swap.
Different channel count
Different package footprint
Different maximum data rate
Different input architecture
Parts at a glance
Part B
ADS1198CPAG
Texas Instruments
- Lifecycle
- Active
- Stock
- 3254 PCS
- Package
- TQFP-64
- Series
- Acquisição de dados - Front End analógico (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 | ADS1198CPAG | ADS114S08IPBS | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 16 | Both are 16-bit delta-sigma ADCs, so nominal resolution is equivalent for signal acquisition. |
| Number of input channels | 8 | 12 | Channel count determines how many sensors or electrodes can be connected without external multiplexing. |
| Maximum sample rate (SPS) | 8000 | 2000 | Higher sample rate supports faster signal bandwidth and better capture of dynamic waveforms. |
| Programmable gain amplifier (PGA) | Yes (1 to 12) | Yes (1 to 128) | PGA gain range affects the ability to resolve small signals from low-amplitude sensors. |
| Supply voltage (analog) | 2.7 V to 5.25 V (unipolar); ±2.5 V (bipolar) | 2.7 V to 5.25 V (analog); 1.7 V to 3.6 V (digital) | Supply requirements determine compatibility with the host system power rails. |
| Interface | SPI | SPI | Both use SPI, so the same host microcontroller bus type can be reused. |
| Integrated features | Internal reference, oscillator, lead-off detection, respiration measurement, Wilson terminal | Internal reference, oscillator, PGA, IDAC current sources, GPIO | On-chip features reduce external component count and board area for the target application. |
| Package | 64-TQFP (10x10) | 64-TQFP (10x10) | Identical package footprint allows potential drop-in board layout reuse. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +125 °C | Wider temperature range supports use in harsher industrial environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS114S08IPBS | ADS1198CPAG |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| 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 | - |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V | 1.65V ~ 3.6V |
| Features | PGA, Temperature Sensor | - |
| Operating Temperature | -50°C ~ 125°C | - |
| Number of Channels | - | 8 |
| Power (Watts) | - | 8.2 mW |
| Mounting Type | - | Surface Mount |
Frequently asked questions
What are the primary functional differences between the ADS1198CPAG and the ADS114S08IPBS?
The ADS1198CPAG is an 8-channel, 16-bit delta-sigma analog front-end (AFE) designed for biopotential measurements, integrating programmable gain amplifiers, an internal oscillator, and a respiration impedance measurement block. The ADS114S08IPBS is a 12-channel, 16-bit delta-sigma ADC with a programmable gain amplifier and an integrated reference, intended for general-purpose precision sensor measurement. The ADS1198CPAG targets ECG/EEG and similar medical instrumentation, while the ADS114S08IPBS targets general precision signal acquisition.
Are the ADS1198CPAG and ADS114S08IPBS pin-to-pin or package compatible?
No. The ADS1198CPAG is supplied in a 64-pin TQFP (PAG suffix) package, while the ADS114S08IPBS is supplied in a 32-pin TQFP (PBS suffix) package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for one another.
How do the input channel counts and data rates compare?
The ADS1198CPAG provides 8 differential input channels with a maximum data rate of 8 kSPS per channel. The ADS114S08IPBS provides 12 single-ended or 6 differential inputs and supports data rates up to 2 kSPS. The channel count and throughput requirements of the target design should be evaluated against these figures.
Do both devices include an integrated voltage reference?
The ADS114S08IPBS integrates an internal voltage reference. The ADS1198CPAG does not include an internal voltage reference and requires an external reference for its conversions. Designs migrating between the two must account for this difference in external component count and reference accuracy budgeting.
What are the supply voltage requirements for each device?
The ADS1198CPAG operates from an analog supply (AVDD) of 2.7 V to 5.25 V and a digital supply (DVDD) of 1.7 V to 3.6 V. The ADS114S08IPBS operates from an analog supply of 2.7 V to 5.25 V and a digital supply of 2.7 V to 3.6 V. Both are low-voltage CMOS devices, but the digital supply ranges differ, which affects logic-level interfacing.
Is the ADS1198CPAG suitable for general-purpose precision ADC applications like the ADS114S08IPBS?
The ADS1198CPAG is optimized for biopotential AFE applications and includes application-specific features such as respiration impedance measurement and lead-off detection. The ADS114S08IPBS is a general-purpose precision ADC with an integrated reference and a higher channel count. Selection should be based on whether the application requires the specialized biopotential features of the ADS1198CPAG or the general-purpose flexibility of the ADS114S08IPBS.
What are the operating temperature ranges for these two devices?
Both the ADS1198CPAG and the ADS114S08IPBS are specified for operation over the industrial temperature range of -40°C to +85°C. Thermal design and derating should still be validated for the specific application environment.