ADS1298/ADS1298R Replacement: GX1298R Pin-Compatible 8-Channel ECG AFE

GX1298 and GX1298R are eight-channel analog front ends developed for high-precision ECG, EEG and EMG signal acquisition. All eight channels support simultaneous sampling with output data rates up to 32 kSPS.

The devices integrate PGAs, an internal reference and a configurable oscillator, reducing the external circuitry required for medical monitoring equipment. Right-leg drive, lead-off detection, pacemaker detection and WCT/GCT functions further simplify multilead ECG system design.

GX1298 provides a direct replacement for ADS1298, while GX1298R replaces ADS1298R and includes integrated respiration impedance measurement.

GX1298/GX1298R as Direct ADS1298/ADS1298R Replacements

GX1298 and GX1298R retain the eight-channel, 24-bit simultaneous-sampling architecture and SPI communication method used in ADS1298 and ADS1298R systems.

Compatible pin definitions, packages, analog inputs, reference connections and digital interfaces allow existing designs to retain their schematic, PCB and MCU, DSP or FPGA software. The devices also support daisy-chain operation for medical systems requiring additional acquisition channels.

With eight input channels and integrated WCT/GCT functions, the GX1298 series is especially suitable for 12-lead and 18-lead ECG equipment.

Pin-to-Pin Hardware and Software Compatibility

GX1298 and GX1298R are designed for pin-to-pin hardware compatibility with their corresponding ADS1298 and ADS1298R devices. Existing electrode connections, clock and reference circuits, control signals and SPI interfaces can be retained.

Software compatibility allows existing register configuration, channel-control logic, interface timing and data-acquisition programs to continue operating. This helps reduce PCB redesign, firmware migration and replacement verification work.

GX1298 is available in 10 mm × 10 mm QFP-64 and 8 mm × 8 mm BGA-64 packages. The respiration-enabled GX1298R is supplied in an 8 mm × 8 mm BGA-64 package. Both versions operate from −40°C to +85°C.

GX1298/GX1298R vs ADS1298/ADS1298R

ECG Acquisition, Diagnostics and Respiration Measurement

The input multiplexer can route internal and external signals to the ADC channels for offset testing, temperature monitoring, supply measurement and channel testing. These functions support device self-test and system-condition monitoring.

The multiplexer can also select the common-mode level from any input channel to generate the right-leg drive signal. Pull-up and pull-down resistors, excitation current sources and AC lead-off detection provide flexible electrode-connection monitoring.

Integrated pace-detection amplifiers can operate with external circuits for hardware pacemaker detection. Output data rates up to 32 kSPS also support software-based pace detection.

Key features include:

l Eight simultaneous-sampling 24-bit delta-sigma ADC channels

l Output data rates up to 32 kSPS

l Differential and single-ended input configurations

l Integrated programmable gain amplifiers

l Internal reference and oscillator

l 1.65 V to 5.25 V supply support

l SPI data interface

l Right-leg drive

l DC and AC lead-off detection

l Hardware and software pacemaker detection

l Integrated WCT and GCT

l Daisy-chain operation

l Respiration impedance measurement on GX1298R

Medical Monitoring Applications

GX1298 and GX1298R are suitable for:

l 12-lead and 18-lead ECG systems

l High-precision ECG, EEG and EMG acquisition

l Patient monitoring systems

l Holter and ambulatory ECG monitors

l Event and stress monitoring

l AED and telemedicine equipment

l Sleep-monitoring systems

l Respiration impedance measurement

Request GX1298/GX1298R Datasheets and Samples

GXSC provides GX1298 and GX1298R samples, datasheets, compatibility verification and technical support for ADS1298 and ADS1298R replacement projects.

Contact GXSC for product selection, samples, quotations or technical support for new ECG and patient-monitoring designs.