ADS1278 Replacement: GX1278 Fully Hardware and Software Compatible 24-Bit ADC
GX1278 is developed as a direct alternative to ADS1278 for high-precision multichannel data acquisition. Its compatible pinout, 64-pin QFP footprint, pin-controlled operating modes and serial interfaces support migration without redesigning the existing hardware.
The device provides High-Speed, High-Resolution, Low-Power and Low-Speed operating modes. It supports a data rate of 144 kSPS in the compatible high-speed mode and up to 400 kSPS in supported configurations.
GX1278 as a Direct ADS1278 Replacement
GX1278 integrates eight simultaneously sampled 24-bit ADC channels based on a high-order multibit delta-sigma architecture.
For existing ADS1278-based products, GX1278 allows the original PCB, pin-control logic and digital acquisition architecture to be retained. It is also suitable for new high-resolution measurement and multichannel acquisition systems.
Pin-to-Pin Hardware and Software Compatibility with ADS1278
GX1278 is designed for pin-to-pin hardware compatibility with ADS1278. Existing 64-pin QFP footprints, clock connections, mode-control pins and serial data interfaces can be retained.
Both devices use direct pin control without register programming. Existing SPI or frame-sync acquisition logic in an MCU, DSP or FPGA can therefore continue to be used without rewriting the control software.
This compatibility helps avoid changes to the schematic, PCB, processor interface and existing acquisition software.
GX1278 vs ADS1278: Key Specification Comparison
|
Specification |
ADS1278 |
GX1278 |
|
Resolution |
24-bit |
24-bit |
|
Channels |
8 |
8 |
|
ADC Architecture |
Delta-Sigma |
High-Order Multibit Delta-Sigma |
|
Sampling Operation |
Eight-Channel Simultaneous Sampling |
Eight-Channel Simultaneous Sampling |
|
Maximum Data Rate |
144 kSPS |
144 kSPS / Up to 400 kSPS |
|
Input Type |
Differential |
Single-Ended / Differential |
|
Operating Modes |
HS / HR / LP / LS |
HS / HR / LP / LS |
|
High-Speed Mode |
144 kSPS |
144 kSPS |
|
High-Resolution SNR |
111 dB |
Up to 111.7 dB |
|
THD |
−108 dB |
Up to −122.9 dB |
|
Low-Speed Power |
7 mW per Channel |
2.7 mW per Channel |
|
Digital Filter |
Linear-Phase FIR |
Wideband FIR / Low-Latency SINC |
|
FIR Usable Bandwidth |
Approximately 90% of Nyquist |
90.6% of Nyquist |
|
Passband Ripple |
Less Than 0.005 dB |
Less Than 0.005 dB |
|
Control Method |
Direct Pin Control |
Direct Pin Control |
|
Register Programming |
Not Required |
Not Required |
|
Data Interface |
SPI / Frame-Sync Serial |
SPI / Frame-Sync Serial |
|
Package |
HTQFP-64 |
QFP-64 |
|
Pin-to-Pin Compatible |
— |
Yes |
|
Schematic or PCB Changes Required |
— |
No |
|
Processor Interface Changes Required |
— |
No |
|
Software Modification Required |
— |
No |
High-Resolution Conversion Performance and Applications
Key GX1278 features include:
l Eight simultaneous-sampling 24-bit ADC channels
l 144 kSPS high-speed operation and up to 400 kSPS in supported configurations
l Up to 111.7 dB SNR in High-Resolution mode
l THD up to −122.9 dB
l Four selectable speed, resolution and power modes
l Wideband FIR filter with 90.6% usable Nyquist bandwidth
l Low-latency SINC filter with stable output within six cycles
l SPI and frame-sync serial interfaces
l Direct pin control without register programming
l −40°C to +85°C operating temperature range
GX1278 is suitable for vibration and modal analysis, multichannel data acquisition, acoustic measurement, dynamic strain-gauge systems, pressure sensing and revenue metering.
Supply and Technical Support
GXSC can provide samples, compatibility verification and technical support for ADS1278 replacement projects and new precision data acquisition designs.
Request GX1278 Datasheet and Samples
Contact GXSC to request the GX1278 datasheet, samples, quotation or technical support for your ADS1278 replacement or new system design.
mail