The 2.6GSPS high-speed analog-to-digital converter GX9689 replaces the AD9689 in multi-mode digital receivers

The workflow of a multimode digital receiver in fields such as wireless communication and radar detection is "signal reception—analog conditioning—analog-to-digital conversion—digital processing." It must simultaneously support multiple communication protocols and adapt to signals across different frequency bands, accurately capturing weak signals in noisy electromagnetic environments and completing digital processing. The prerequisite for this series of complex tasks is a high-performance analog-to-digital converter.

The GX9689 analog-to-digital converter, featuring GXSC‘s ultra-high sampling rate, high resolution, and outstanding anti-interference capabilities, is specifically designed for high-performance reception scenarios. With its packaging, dimensions, and functions fully pin-compatible with the AD9689, it serves as the most suitable replacement solution currently available.

The GXSC dual-channel 14-bit 2.6 GSPS analog-to-digital converter (ADC), the GX9689, integrates two independent high-performance ADC cores. The device features an on-chip buffer designed to support direct sampling of broadband analog signals up to 5 GHz, enabling seamless coverage of RF, intermediate frequency (IF), and other multi-band signals. This ultra-high sampling rate meets the compatibility requirements of multimode digital receivers for various communication standards. The GX9689 offers advantages such as high input bandwidth, high sampling rate, excellent linearity, compact packaging, and low power consumption.

The GX9689 dual-channel ADC core adopts a multi-stage pipeline architecture and integrates on-chip digital correction algorithms. Each ADC features broadband input with support for various user-selectable input ranges. The integrated reference voltage source simplifies design complexity, while analog input and clock signals are differential inputs.

The GX9689 also features several functions to simplify communication receiver automatic gain control (AGC). The programmable threshold detector allows monitoring of incoming signal power using the fast detection control bits in the ADC register. In addition to the fast detection output, the device provides signal monitoring capabilities, where the signal monitoring module offers additional information about the digitized signal by the ADC. Users can configure the base FJESD204B subclass 1 high-speed serial output into various channel modes, including single-channel, dual-channel, quad-channel, and octal-channel modes, based on data configuration and the acceptable channel data rate of the receiving logic device. The ADC supports multi-device synchronization through the SYSREF+ and SYNCINB± input pins.

Product Advantages of GX9689:

Encapsulation dimensions compatible with reference models, supporting functional replacement of AD9689

The power consumption is approximately 60% of that of the reference chip, effectively reducing the overall power consumption of the system solution

Wide operating temperature range of -55°C to +105°C with robust performance within the working range

The plastic-encapsulated FCBGA196 small-sized package effectively reduces system volume

High integration, incorporating digital downconversion and filtering, helps reduce system costs

204B high-speed interface, facilitating user layout and wiring

Full power bandwidth: 6.0 GHz

Full power bandwidth: 6GHz (-3dB)