Single-channel ADC GX2228 compatible with LTC2228 for spectrum analysis

ADCs have spectrum analyzer functions that support direct conversion, digital down conversion, and direct IQ data recording. However, more than one analog-to-digital converter is often required to reach more than a few gigahertz or to capture signals with very short durations. For example, spectrum analyzers with higher frequency capabilities may employ multiple ADCs; one ADC to convert low frequencies with another ADC, or even multiple ADCs; and collaborative frequency conversion hardware (downconverters) to convert high frequencies to intermediate frequencies that the ADC can handle.

GX2228 is an ADC chip designed for high-frequency, wide dynamic range signals for digital processing, unique ESD protection circuit design, measured ESD (HBM) > 7000V (nominal 4000V). Performance comparable to LTC2228 products, can realize seamless replacement, chip price has a certain advantage.

GX2228 features are as follows:

- 3V (2.7V~3.4V) single power supply

- Low power consumption: 243mW

- No leakage code

- Signal-to-noise ratio SNR: 71.3dB SNR

- Spurious-free dynamic range SFDR: 90dB

- Flexible input: 1Vp-p to 2Vp-p range

- 575MHz full power bandwidth sample and hold

- Integrated clock duty cycle stabilizer

- Supports shutdown and snooze modes

Spectrum analyzers can employ multiple analog-to-digital converters in the same frequency band as needed. In this case, faster but less accurate analog-to-digital converters are used to quickly capture frequency sweeps, while higher accuracy analog-to-digital converters provide signal monitoring and analysis at slower rates. In addition, multiple ADCs can be used in conjunction with interleaved sampling windows to improve the probability of interception.