ADC GX9268 (AD9268) used in inverter temperature acquisition module

Inverter products contain rectifier, inverter, braking, current and voltage detection module unit, this article introduces the temperature acquisition module, the module mainly uses NTC to collect the product‘s ambient temperature and the chip‘s heating temperature, when the temperature is too high, the master control through the control of the reduced input current and voltage to reduce the power to form a closed-loop control.

Which need to use the ADC for analog to digital conversion, here we recommend GX9268 (compatible with ADI‘s AD9268), which is a dual-channel 16-bit, maximum conversion speed of 125MSps, based on the pipeline architecture of the ADC, the internal integration of the clock buffer, the reference voltage source, the input sample to maintain the functionality of the module to achieve high-speed and high-precision ADC for analog inputs.

The GX9268 integrates a unique digital calibration algorithm, which effectively improves the dynamic characteristics of the ADC without affecting power consumption. The output is a 1.8V fully parallel CMOS level, and a three-wire SPI serial interface is used to realize internal register read/write operations.The GX9268 is packaged in a 64-pin QFN package and rated over the -40°C to 85°C industrial temperature range.

GX9268 main features advantages:

1.8V analog power supply supply

1.8VCMOS output supply

Low power consumption: 750mW (125MSps)

Signal-to-Noise Ratio (SNR) : 78dBFS (70MHz, 125MSps)

Spurious Free Dynamic Range (SFDR) : 88dBc (70MHz, 125MSps)

IF sampling frequency up to 400MHz or more

Small-signal input noise: -154.0dBm/Hz (200Ω input impedance, 70MHz, 125MSps)

Programmable ADC internal reference voltage source

Integrated ADC sample-and-hold input

Flexible analog input range: 1Vpp to 2Vpp

Differential analog input 650MHz bandwidth