ADS1198CPAG

Analog Front End (AFE) Overview

The ADS1198CPAG is a low-noise, 8-channel analog front-end (AFE) designed for biopotential signal acquisition. It integrates eight simultaneous sampling 16-bit sigma-delta ADCs with programmable gain amplifiers (PGAs). The device operates on an analog supply voltage ranging from 2.7 V to 5.25 V and a digital supply of 1.65 V to 3.6 V. It supports data rates up to 8 kS/s per channel and features a serial SPI interface. Key electrical specifications include a signal-to-noise ratio (SNR) of 97 dB, integral nonlinearity (INL) of 15 ppm, and power consumption of 4.3 mW. The component is housed in a TQFP-64 package and functions within a temperature range of 0°C to +70°C.

Analog Front End (AFE) Feature Summary

• Integrates eight simultaneous-sampling 16-bit delta-sigma ADCs with integrated PGAs
• Supports differential or single-ended input configurations
• Features internal or external reference voltage options
• Operates with analog supply voltages between 2.7 V and 5.25 V

Analog Front End (AFE) Applications

• Wireless 12-lead electrocardiogram (ECG) systems
• Low-cost portable ECG monitoring devices
• Low-power e-health platforms for cardiovascular monitoring

Analog Front End (AFE) Procurement Notes

Verify the specific package variant when ordering, as the CPAG suffix denotes a TQFP-64 tray package. Confirm that the required operating temperature range aligns with the commercial grade specification (0°C to +70°C). Ensure the design accommodates the dual-supply requirement for analog and digital domains. Check for moisture sensitivity level requirements during storage and handling procedures.

Analog Front End (AFE) Selection Notes

Select this component for applications requiring high-resolution, multi-channel biopotential acquisition with low power consumption. The simultaneous sampling architecture is critical for maintaining phase coherence across channels in ECG applications. Consider the TQFP-64 package constraints if board space is limited compared to the NFBGA option. Verify PGA gain settings against the expected input signal amplitude to optimize dynamic range.

Analog Front End (AFE) Part Context

The ADS1198CPAG belongs to the Texas Instruments ADS1198 family of biopotential AFEs. It serves as a system-level integration solution, replacing discrete instrumentation amplifiers, filters, and ADCs typically found in conventional ECG designs. This integration reduces component count and overall system cost while improving performance metrics such as noise and linearity.

Analog Front End (AFE) Replacement Considerations

The ADS1198CZXGT offers identical electrical functionality but utilizes an NFBGA-64 package instead of the TQFP-64 form factor.