Four-channel 14-bit 125MSPS Sampling ADC GX9253 Compatible with AD9253 for Diversity Radio Receivers

In the field of wireless communication, a diversity radio receiver is a device designed to combat signal fading and enhance communication reliability. Its principle involves simultaneously receiving the same signal through multiple antennas or multiple frequency bands (frequency diversity), processing the signals, and then selecting the optimal signal or combining multi-channel signals to reduce communication interruptions caused by fading.

However, the signal acquisition in diversity radio receivers requires key features such as multi-channel synchronous sampling, high-speed signal processing, ultra-high sampling rates, and high dynamic range. The GX9253, a 4-channel, 14-bit, 125MSPS ADC specifically designed for diversity radio receivers, incorporates built-in sample-and-hold circuits. It is engineered for low cost, low power consumption, compact size, and ease of use. With a maximum conversion rate of 125MSPS, the GX9253 boasts exceptional dynamic performance and low-power characteristics, making it suitable for applications with small package sizes. Its advantages include the following:

Product dimensions and pin function compatibility reference model, supports pin-to-pin replacement for AD9253

Single power supply, more convenient to use

Low power consumption, no need for a heat sink

Adjustable input voltage range

The GX9253 employs a 1.8V single power supply and LVPECL/CMOS/LVDS-compatible sample rate clock signal to maximize its performance, eliminating the need for external reference power sources or driver devices in most applications. To achieve the appropriate LVDS serial data rate, the GX9253 automatically multiplies the sample rate clock. It provides a data clock output (DCO) for capturing data at the output and a frame clock output (FCO) for transmitting new output byte signals. Additionally, it supports individual channel power-down modes; when all channels are disabled, the typical power consumption is below 2.2mW

Performance Indicators of GX9253

1. Static Performance: DNL -0.9/+1.0 LSB, INL -5.0/+5.0 LSB

2. Dynamic Performance (fs=125MSpS, Input Signal Power -1dBFS)

fin=9.7MHz

ENOB=11.7Bit，SINAD=72dBFS，SNR=72.5dBFS

fin=70MHz

ENOB=11.2Bit，SINAD=69dBFS，SNR=69.5dBFS

fin=128MHz

ENOB=10.5Bit，SINAD=64.7dBFS，SNR=65.3dBFS

fin=200MHz

ENOB=10.0Bit，SINAD=61.9dBFS，SNR=62.5dBFS