Meteorological radar can use analog-to-digital converter GX9653100% software and hardware to replace AD9653

Meteorological radar mainly provides key data support for meteorological forecasting. In the complex architecture of meteorological radar systems, analog-to-digital converters mainly accurately convert weak analog echo signals received by radar antennas into digital signals. The data acquisition of modern meteorological radar systems (such as Doppler radar and phased array radar) needs to meet three core performance requirements:

1. Ultra high speed sampling (≥ 100MSPS, analyzing rapidly changing cloud motion)

2. Ultra large dynamic range (>90dB, simultaneously detecting heavy precipitation and weak turbulence)

3. Ultra low noise base (<0.5mVrms, improves weak signal detection rate)

The GX9653 four channel 16 bit 125MSPS analog-to-digital converter has become a standard component for meteorological radar signal chains due to its excellent performance. This analog-to-digital converter can replace ADI‘s AD9653 with 100% software and hardware, becoming the preferred ADC solution for high-performance weather radar.

The GX9653 analog-to-digital converter can digitize weak signals received by radar at a fine quantization level. The four channels can simultaneously sample and convert multiple analog signals, which is very useful for systems that need to process signals from multiple receiving channels simultaneously. Through multi-channel parallel acquisition, the echo information of radar targets at different angles or polarization modes can be obtained, thereby improving the radar‘s detection, localization, and recognition capabilities for targets.

The sampling and holding circuit on the GX9653 analog-to-digital converter chip has the characteristics of low design cost, low power consumption, small size, and ease of use. The main features of its chip are introduced as follows:

Data rate: 20Msps~125Msps

• Signal to Noise Ratio (SNR):

77.9dBFs@Vref =1V,fin=10MHz； 72.2dBFs@Vref =1V,fin=200MHz

• Stray free signal input range (SFDR)

96.66dBFs@Vref =1V,fin=10MHz； 78.8dBFs@Vref =1V,fin=10MHz

1.8V power consumption: single channel 170mW@125Msps

• Built in benchmark and clock buffer

Analog input bandwidth 650MHz

2Vpp input voltage range, supporting an increase to 2.6Vpp

• Power supply range: Analog power supply 1.7V to 1.9V; Digital power supply 1.7V to 1.9V

Differential Nonlinear (DNL)=± 0.7LSB; Integral nonlinear INL=± 3.5LSB

Flexible power-off and standby modes, independent and controllable channels, flexible output code value modes, support multi chip synchronization, clock division