3333AV Ver la hoja de datos (PDF) - MediaTek Inc

Número de pieza

componentes Descripción

Fabricante

3333AV

High-performance Single-chip Multi-gnss Solution

MediaTek Inc 

4. Radio Subsystem Features

MT3333 All-in-One GNSS

Datasheet

4.1. Low Noise Amplifier (LNA) and mixer

The MT3333 includes an LNA that offers devices two antenna options:

• A multi-GNSS antenna connected directly to the internal LNA in high-gain mode, ideal for low-cost

solutions without an external LNA.

• An external antenna and high gain external LNA connected to the internal LNA in low-gain mode, which

offers high linearity. In this configuration, external LNA gain ranging from 15 to 20 dB is recommended.

The maximum total external RF front end gain including active antenna and external LNA can be 43dB.

The down-conversion mixer then converts the amplified signal to the Intermediate Frequency (IF) signal. The

down-conversion mixer is a single-ended passive mixer, with a current mode interface between the mixer and

multi-modes low pass filter.

4.2. Voltage Controlled Oscillator (VCO) and synthesizer

The frequency synthesizer includes a crystal oscillator, VCO, divider, phase frequency detector (PFD), charge pump

(CP) and loop filter, which are all integrated on the MT3333 chip. The VCO is auto-calibrated to its required sub-

band when the chip is powered on.

4.3. Low Pass Filter (LPF)

The current-mode LPF provides modes for the various combinations of GNSS constellations supported by MT3333.

4.4. Analog-to-Digital Converter (ADC)

The differential IF signal is quantized by a high performance ADC. The ADC sampling clock is provided by the

divided clock from the local oscillator (LO).

4.5. Active Interference Canceller (AIC)

The AIC can detect 12 different single-tone interference signals. It can then track the phase and frequency of these

12 interference signals to provide continuous cancellation.

© 2016 - 2017 MediaTek Inc.

Page 6 of 22

This document contains information that is proprietary to MediaTek Inc. (“MediaTek”) and/or its licensor(s).

Any unauthorized use, reproduction or disclosure of this document in whole or in part is strictly prohibited.

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