Dual-channel 16-bit 125MSPS Analog-to-Digital Converter GX9268 Replaces AD9268 for Ultrasonic Equipment Applications

Ultrasonic technology offers advantages such as being non-invasive, real-time, low-cost, and highly safe. The workflow of ultrasonic equipment involves ultrasonic wave transmission—echo reception—signal conditioning—analog-to-digital conversion—signal processing—image/result output. However, during propagation and reflection, ultrasonic signals experience rapid attenuation and wide bandwidth, with target information hidden within faint signal details. This imposes stringent requirements on the analog-to-digital converter (ADC) in the signal processing chain, demanding "high speed, high precision, and high signal-to-noise ratio." The GXSC GX9268 ADC, featuring 16-bit high resolution, 250 MSPS ultra-high sampling rate, and exceptional signal capture capability, is ideally suited for mid-to-high-end ultrasonic equipment.

The GX9268 features two built-in 16-bit, 125MSPS analog-to-digital converters (ADCs). Each ADC core employs a multi-stage differential pipelined architecture and integrates output error correction logic. Both ADCs offer broadbandwidth and differential sample-and-hold analog input amplifiers, supporting user-selectable input ranges. The GX9268 can directly output data to two external 16-bit ports, configurable as 1.8V CMOS or LVDS. Flexible power-down options are available to significantly reduce power consumption when needed. Programming for setup and control is accomplished via a three-wire SPI-compatible serial interface.

For various application scenarios, the GX9268 can provide product series with different speed tiers (60M/80M/105M/125M) based on application requirements, enabling flexible power consumption control. The speed tier can be identified via the speed grade register. The advantages of the GX9268 are introduced as follows:

The package adopts a plastic LFCSP64, with functional compatibility to the reference model AD9268

Low power consumption, no need for a heat sink

Optional intra-chip disturbance

Programmable ADC internal reference voltage source

Single 1.8V power supply

Flexible analog input range: 1Vpp to 2Vpp

Flexible power-saving power-off mode

Operating temperature range: -55°C to +125°C

Dynamic performance:

-fin=2.4MHz，ENOB=12.7Bit，SNDR=78.3dBFS，SNR=78.8dBFS

-fin=70MHz，ENOB=12.6Bit，SNDR=77.7dBFS，SNR=78.1dBFS

-fin=140MHz，ENOB=12.3Bit，SNDR=75.6dBFS，SNR=76.9dBFS

-fin=200MHz，ENOB=12.0Bit，SNDR=73.8dBFS，SNR=75.3dBFS

Static Performance: DNL: -1.1/+1.2 LSB, INL: -4.0/+4.0 LSB

Differential analog input bandwidth: 650MHz