AD9694 Replacement: GX14Q500E Fully Hardware and Software Compatible Quad ADC
GX14Q500E is a four-channel, 14-bit, 500 MSPS ADC developed as a direct replacement for AD9694. It integrates input buffers, sample-and-hold circuits and four digital downconverters in a compact QFN72 package.
The device supports differential inputs, a 1.4 GHz analog input bandwidth and JESD204B Subclass 1 outputs. Existing AD9694 designs can migrate to GX14Q500E without modifying the original schematic, PCB, FPGA receive logic or control software.
GX14Q500E for AD9694 Replacement and New Designs
GX14Q500E provides a direct migration path for products currently using AD9694. Pin-to-pin compatibility allows the original 72-lead footprint, power architecture and peripheral circuits to remain unchanged.
For new designs, its four synchronized ADC channels, integrated digital processing and JESD204B outputs provide a compact solution for wideband receivers, software-defined radio and high-speed test equipment.
Pin-to-Pin Hardware and Software Compatibility with AD9694
GX14Q500E is hardware compatible with AD9694, including the pinout, 0.975 V, 1.8 V and 2.5 V supply rails, differential analog and clock inputs, JESD204B outputs, synchronization signals and 72-lead package footprint.
It is also software and interface compatible with AD9694-based systems. Existing 3-wire SPI configuration, DDC and NCO settings, JESD204B link parameters, SYSREF/SYNC synchronization and FPGA receive logic can be retained.
This compatibility allows AD9694 to be replaced without changing the original schematic, PCB, FPGA interface or software architecture.
GX14Q500E vs AD9694: Key Specification Comparison
|
Specification |
AD9694 |
GX14Q500E |
|
Resolution |
14-bit |
14-bit |
|
ADC Channels |
4 |
4 |
|
Maximum Sampling Rate |
500 MSPS |
500 MSPS |
|
−3 dB Analog Input Bandwidth |
1.4 GHz |
1.4 GHz |
|
Input Type |
Differential |
Differential |
|
On-Chip Input Buffer |
Yes |
Yes |
|
Integrated Sample-and-Hold |
Yes |
Yes |
|
Supply Voltages |
0.975 V / 1.8 V / 2.5 V |
0.975 V / 1.8 V / 2.5 V |
|
Data Output Interface |
JESD204B Subclass 1 |
JESD204B Subclass 1 |
|
Maximum JESD204B Lane Rate |
15 Gbps |
13.1 Gbps |
|
Digital Downconverters |
4 |
4 |
|
NCO Resolution |
48-bit |
48-bit |
|
Half-Band Decimation Filters |
Up to 4 |
Up to 4 |
|
Multi-Device Synchronization |
SYSREF / SYNC |
SYSREF / SYNC |
|
Control Interface |
3-Wire SPI |
3-Wire SPI |
|
Operating Temperature |
−40°C to +105°C junction |
−55°C to +125°C |
|
Package |
72-Lead LFCSP, 10 mm × 10 mm |
QFN72, 10 mm × 10 mm |
|
Pin-to-Pin Hardware Compatible |
— |
Yes |
|
Schematic Modification Required |
— |
No |
|
PCB Redesign Required |
— |
No |
|
FPGA Interface Modification Required |
— |
No |
|
Software Modification Required |
— |
No |
GX14Q500E retains the principal sampling, digital-processing, JESD204B and control architecture required by AD9694-based systems. The target JESD204B configuration should operate within the GX14Q500E maximum lane rate of 13.1 Gbps.
Wideband Conversion and Digital Processing
Each GX14Q500E channel uses a multistage differential pipelined architecture with integrated digital error correction. Its four DDCs each include a 48-bit NCO and up to four cascaded half-band decimation filters.
Key GX14Q500E specifications include:
l Four 14-bit ADC channels
l Sampling rate up to 500 MSPS
l 1.4 GHz analog input bandwidth
l Integrated input buffers and sample-and-hold circuits
l Four integrated DDCs
l 48-bit NCO
l Up to four half-band decimation filters
l JESD204B Subclass 1 outputs
l Lane rates up to 13.1 Gbps
l SYSREF and SYNC synchronization
l 3-wire SPI configuration
l QFN72 package
GX14Q500E is suitable for multimode digital receivers, software-defined radio, wireless communication, phased-array systems, automatic test equipment and high-speed instrumentation.
Technical Support for Direct Replacement
GXSC can provide samples, schematic review, compatibility verification, JESD204B link support and FPGA testing to help customers replace AD9694 while retaining the existing PCB and software architecture.
Request GX14Q500E Datasheet and Samples
Contact GXSC to request the GX14Q500E datasheet, samples, quotation or technical support for your AD9694 replacement or new wideband ADC project.
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