REALTEK RTL8225 8225 IEEE 802.11b/g RF Transceiver (2.4GHz)

The RTL8225/RTL8225-VF is a fully integrated RF transceiver compliant with IEEE Wireless LAN standards 802.11b, and 802.11g. When used with a baseband/MAC processor (e.g. RTL8185 or RTL8187) and a 2.4GHz power amplifier, it forms a complete solution for the 2.4GHz ISM band. The RTL8225/RTL8225-VF uses a direct conversion/zero-IF architecture to limit the number of required active blocks and avoid external, cumbersome, IF bandpass SAW filters for channel selection.

The receive path includes sets of single-ended Low Noise Amplifiers (LNA), followed by RF-to-baseband I/Q demodulators, baseband filters, and discrete-step variable-gain amplifiers. The entire receive chain provides linear and monotonic automatic gain control, RSSI signal, and fast DC offset cancellation mechanisms to a baseband processor.

The transmitter path includes integrated reconstruction filters, discrete-step variable-gain amplifiers, a baseband-to-RF I/Q modulator, and pre amplifiers. A linear and monotonic gain control is distributed throughout the transmitter chain to ensure high linearity as well as to simplify Automatic Gain Control (AGC).

The modulator and demodulator are driven by an internal Voltage Controlled Oscillator (VCO). The VCO is phase-locked by an internal 3-wire-interfaced PLL. In the RTL8225-VF, a crystal oscillator using an external crystal and two Low Drop-Out  (LDO) regulators are also integrated.

The differences between the RTL8225 and RTL8225-VF are:

1. The RTL8225 needs two external LDO regulators. These LDOs are integrated into the RTL8225-VF.
2. The RTL8225 uses an external oscillator to generate a 40MHz clock source as input to the RTL8225. The RTL8225-VF replaces the oscillator with crystal.  

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Packaging: Safety package(Carton) 
Shipping: 
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Warranty:
1.Our side always double check all the products before delivery to make sure correct.
2.All components we sell has 30 days return policy from the day of shipment, but if the damage is man-made, we will be unable to change for you.