AD7656 Replacement: GX6656 Fully Hardware and Software Compatible 16-Bit ADC
GX6656 is developed as a direct alternative to AD7656 for industrial measurement and multichannel data acquisition systems. Its compatible pinout, LQFP-64 package, bipolar input architecture and digital interfaces support replacement without redesigning the existing PCB.
The device supports selectable ±10 V and ±5 V true bipolar inputs, together with 16-bit parallel, 8-bit parallel-byte and SPI-compatible serial interfaces. Existing processor and FPGA acquisition software can therefore be retained during migration.
GX6656 as a Direct AD7656 Replacement
GX6656 integrates six independent 16-bit SAR ADCs and supports simultaneous sampling across all six channels at up to 250 kSPS per channel.
For existing AD7656-based products, GX6656 provides a direct migration path while retaining the original board layout and system architecture. It can also be evaluated for new industrial monitoring, control and data acquisition designs.
Pin-to-Pin Hardware and Software Compatibility with AD7656
GX6656 is designed for pin-to-pin hardware compatibility with AD7656. Existing LQFP-64 footprints, analog connections, control signals and digital interfaces can be retained.
It also provides software and interface compatibility with AD7656-based systems. Existing MCU, DSP or FPGA readout logic, interface timing and acquisition software can continue to be used.
This allows migration to GX6656 without modifying the schematic, PCB, processor interface or existing control software.
GX6656 vs AD7656: Key Specification Comparison
|
Specification |
AD7656 |
GX6656 |
|
Resolution |
16-bit |
16-bit |
|
Channels |
6 |
6 |
|
ADC Architecture |
Six SAR ADCs |
Six SAR ADCs |
|
Sampling Operation |
Six-Channel Simultaneous Sampling |
Six-Channel Simultaneous Sampling |
|
Maximum Sampling Rate |
250 kSPS per Channel |
250 kSPS per Channel |
|
Input Type |
Single-Ended, True Bipolar |
Single-Ended, True Bipolar |
|
Input Ranges |
±10 V / ±5 V |
±10 V / ±5 V |
|
ADC Supply |
5 V |
5 V |
|
VDRIVE Range |
2.7–5.25 V |
2.5–5.25 V |
|
Typical SNR |
86.5 dB |
Up to 90 dB |
|
Typical SFDR |
100 dB |
100 dB |
|
Input Architecture |
High-Impedance Input |
Integrated 1 MΩ Input Buffer |
|
Antialiasing Filter |
External Filter May Be Required |
Integrated |
|
Internal Reference |
Yes |
Yes |
|
Data Interface |
Parallel / Serial / Daisy Chain |
16-Bit Parallel / 8-Bit Parallel-Byte / SPI-Compatible Serial |
|
Serial DOUT Configuration |
Up to Three DOUT Lines |
One, Two or Three DOUT Lines |
|
Daisy-Chain Operation |
Yes |
Yes |
|
Package |
LQFP-64 |
LQFP-64 |
|
Pin-to-Pin Compatible |
— |
Yes |
|
Schematic or PCB Changes Required |
— |
No |
|
Processor Interface Changes Required |
— |
No |
|
Software Modification Required |
— |
No |
Simultaneous-Sampling Performance and Applications
Key GX6656 features include:
l Six simultaneous-sampling 16-bit SAR ADCs
l Up to 250 kSPS per channel
l ±10 V and ±5 V true bipolar input ranges
l Up to 90 dB SNR and 100 dB SFDR
l Bipolar zero-scale error as low as ±2 LSB
l Linearity better than 1 LSB
l Integrated 1 MΩ input buffers
l Integrated antialiasing filters
l Configurable reference generator and buffer
l Parallel, parallel-byte and SPI-compatible serial interfaces
l Daisy-chain operation
GX6656 is suitable for power-line monitoring, instrumentation and control systems, multiaxis positioning and multichannel data acquisition equipment.
Supply and Technical Support
GXSC can provide samples, compatibility verification and technical support for AD7656 replacement projects and new data acquisition designs.
Request GX6656 Datasheet and Samples
Contact GXSC to request the GX6656 datasheet, samples, quotation or technical support for your AD7656 replacement or new system design.
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