AD6190

Features:

Complete 900 MHz RF Transceiver
    LNA
    Receive Mixer
    Transmit Mixer
    Driver Amplifier
    VCO
    Prescaler
    Limiter Amplifier with RSSI
On-Chip Low Dropout Regulator
Independent Sleep Modes for TX, RX
28-Lead SSOP Package


Application

902 MHz928 MHz ISM Band Cordless Telephones
902 MHz928 MHz ISM Band Wireless Data Systems


Pinout




Specifications

Supply Voltage
VBATT, VCCIF, LNAVCC, VCCTX to GND . . . . . . . . . . . . . . . . . . . . +5.5 V
Maximum RF Input Level Without Damage . . . . . . . . . . . . . . . +20 dBm
Internal Power Dissipation2 . . . . . . . . . . . . . . . . . . . . . . . . . . .500 mW
Operating Temperature Range . . . . . . . . . . . . . . . . . . 25°C to +85°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . .65°C to +150°C
Lead Temperature Range
(Soldering, 60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C


Description

The AD6190 900 MHz RF Transceiver provides a complete RF/IF section for systems operating in the 902 MHz928 MHz license-free ISM band. The high level of integration allows several dozen discrete components to be replaced. It is ideally suited for use in cordless telephone and wireless data applications.

The receiver section of AD6190 includes a Low Noise Amplifier (LNA). The LNA's output drives an image-reject mixer; the mixer's output optimized for 10.7 MHz is filtered and processed by the limiting IF amplifier.

The transmit section of AD6190 accepts a modulated 10.7 MHz IF input, and uses an image-reject upconverter to mix the signal up to the 902 MHz928 MHz RF carrier frequency while suppressing the unwanted image and LO components. The RF output is raised to a nominal 0.5 milliwatt (3 dBm) output level. This output can be used directly or can drive an external power amplifier to higher levels.

The on-chip VCO of AD6190 operates at 2´ the local oscillator frequency. This reduces oscillator pulling due to strong interferers in-band or transmitter leakage. An on-chip 64/65 prescaler allows the VCO to be controlled by a low cost 15 MHz CMOS synthesizer.

An on-chip low dropout regulator of AD6190 minimizes VCO pushing. The transmit section, receive section, or both, can be placed in a low current SLEEP mode when not in use. The AD6190 900 MHz RF transceiver is packaged in a 28-lead SSOP package.

The AD6190 900 MHz RF Transceiver is part of the Analog Devices/Zilog "A-to-Z Phone" Spread-Spectrum System for cordless telephone and data communications applications. Contact Zilog directly at (408) 370-8000 for more information on the Z87000 series baseband controller chips.