GENERAL DESCRIPTION

The 2751 is a 900 MHz ISM band radio front-end intended for use in half duplex radio applications such as cordless phones and FCC Part 15 compliant devices. It integrates a power amplifier (PA), a Low Noise Amplifier (LNA), Pin Diode drivers for an external transmit/receive switch, and control circuits. The 100mW power amplifier has output power control with a >20dB range. The ML2751 can be used to increase battery life and offers output power ramp control in TDMA applications. An internal LNA eliminates the need for a discrete design. PIN diode drivers control the transmit/receive switch directly. Internal logic individually enables the LNA, PA, and PIN diode drivers. A power down mode to minimize current consumption is included.

FEATURES

■ Fully integrated Power Amplifier, Low Noise Amplifier, and PIN diode drivers

■ 100mW Power Amplifier

■ Single supply, 2.7V to 4.5V operating range

■ PA output: +21 dBm at 3.0V, 35dB gain, 35 efficiency at 3.3V after harmonic filter; integrated PA ramp control

■ LNA: noise figure of 2.5dB, –15dBm 3rd-order intercept point, and –25dBm

APPLICATIONS

■ 900 MHz FCC Part 15 Radios

■ 900 MHz Cordless Telephones

■ TDD / TDMA Radios