Dual-channel ADC GX9208 Replaces ADI‘s AD9208 for Mapping Radar

Lidar mapping technology is an efficient and fast three-dimensional mapping technology, and its application in engineering mapping is becoming more and more widespread. For example, the 3D coordinates are obtained through high-precision and high-density laser point cloud data, and then the digital elevation model obtained by manual interactive processing. It can effectively solve the problem of rapid acquisition of DEM data, and its high precision can also meet the high requirements for elevation in many industries. In addition, some basic surveying and precision surveying and mapping are also applied to LiDAR mapping technology.

For LiDAR mapping, the measurement accuracy and efficiency depend on the sampling frequency of ADC. In LiDAR, the signal received by the receiver needs to be amplified and channel-selected by the analog front-end, and then the analog signal is converted into a digital signal by the ADC. Therefore, the measurement accuracy of LiDAR is directly dependent on the sampling frequency of the ADC.GXSC GX9208 ADC instead of ADI‘s AD9208 can be applied to mapping radar.

The GX9208 is a dual-channel, 14-bit, 3GSPS analog-to-digital converter (ADC). The device has a built-in on-chip buffer and sample-and-hold circuitry, and is designed for low power consumption, small size and ease of use. Designed to support communications applications and enable direct sampling of wide bandwidth analog signals up to 5 GHz, the GX9208 is optimized for wide input bandwidth, high sampling rate, excellent linearity, and low power consumption in a small package.

The dual-channel ADC core utilizes a multi-stage, differential pipeline architecture with integrated output error correction logic. Each ADC has a wide bandwidth input. An integrated reference voltage source simplifies design considerations. The analog inputs and clock signals are differential input signals.

The GX9208 utilizes a fast-detect control signal in the ADC‘s register (0x0245), a programmable threshold detector that monitors the input signal power. If the input signal level exceeds the programmable threshold, the fast detect indicator goes high. Since the delay of this threshold indicator is extremely short, the user is able to quickly turn down the system gain, thus avoiding over-range at the ADC input. In addition to the fast detect output, the GX9208 has signal monitoring capabilities. The signal monitoring module provides additional information about the signal that the ADC is digitizing.

GX9208 Product Features:

- Supports direct radio frequency (RF) signal sampling at approximately 5 GHz.

- SPI control of various product features and functions to meet specific system requirements.

- Programmable fast over-range detection and signal monitoring.

- 196-ball BGA package (12mmx12mm) eliminates the need for a heat sink.