Replaces AD9208, GX9208 for Multiband, Multimode Digital Receivers

Most word receivers have high requirements for the high-performance ADCs and analog devices they employ. For example, cellular base station digital receivers require sufficient dynamic range to handle large interfering signals in order to demodulate useful signals at lower levels.

The GX9208 dual-channel ADC core utilizes a multi-stage, differential pipeline architecture with integrated output error correction logic. Each ADC features wide bandwidth inputs. An integrated reference voltage source simplifies design considerations. The analog inputs and clock signals are differential input signals. This provides excellent dynamic characteristics for both key stages of the receiver‘s circuitry.

 

The GX9208 utilizes a fast-detect control signal in the ADC‘s register (0x0245), a programmable threshold detector that monitors the input signal power. If the input signal level exceeds the programmable threshold, the fast detect indicator goes high. Since the delay of this threshold indicator is extremely short, the user is able to quickly turn down the system gain, thus avoiding over-range at the ADC input.

 

In addition to the fast detect output, the GX9208 also has signal monitoring capability. The signal monitoring module provides additional information about the signal that the ADC is digitizing.

 

GX9208 Product Features:

- Supports direct radio frequency (RF) signal sampling at approximately 5 GHz.

- SPI control of various product features and functions to meet specific system requirements.

- Programmable fast over-range detection and signal monitoring.

- 196-ball BGA package (12mmx12mm) eliminates the need for a heat sink.

- Rated over a temperature range of -40°C to +85°C.

 

In addition, the GX9208 has a flexible shutdown option to significantly reduce power consumption when needed. All of these features are programmable via a three-wire serial interface (SPI).