Digital Walkie Talkie ICs

• Baseband:SCT3288
• Baseband:SCT3258
• RF transceiver:SCT3811
• RF transceiver:SCT3700
• RF PA(2W):SCT3604

Digtal radio & Basestation modules

• Basestation:SCT3252B
• Digtial basestation module :SCT9377
• Digital radio module:SCT9388

Voice & Wireless ICs

• Voice processor:SCT2088
• 2.4GHz Transceiver:SCT2400

Analog Walkie Talkie ICs

• RF PA(2W):SCT3604

SCT3811: Direct Conversion Receiver

Overview

The SCT3811 is a direct conversion receiver IC comprising a broadband LNA with gain control followed by a high dynamic range, very high IIP2, I/Q demodulator.
The receiver baseband section includes amplifiers and precise, configurable bandwidth, baseband filter stages. An external LO input is provided with LO dividers for flexible multi-band operation.

SCT3811 with a VCO&PLL chip can implement a high integrated(no IF filter, no Mixer, no LNA), high performance radio RF solution. The RF performance can competed with super het solution.

With Sicomm digital baseband(include SCT3811 driver), it's easy to develop a professional digital radio.

Features

• Direct conversion receiver with low power modes
• Rx single conversion to zero IF, near-zero IF or low IF; zero IF eliminates image responses
• Very high mixer IIP2 for practical zero IF receiver
• 100MHz to 650MHz I/Q demodulator
• LNA with gain control
• Precise filtering with 1:2:4 bandwidth select control
• Mixer Bandwidth up to 20MHz
• Local Oscillator *Rx LO divide by 2, 4 or 6 modes *Tx LO Output with divide by 1, 2, 4, or 6 modes
• 3.0V – 3.6V Low power Operation
• Small size 40-pin VQFN Package

Applications

• Analogue/digital multi-mode radio
• Software Defined Radio (SDR)
• Data telemetry modems
• Satellite communications
• Constant envelope and linear modulation
• Narrowband e.g. 25kHz, 12.5kHz, 6.25kHz
• Wideband Data e.g. >1MHz bandwidth

Block diagram