QN8027

QN8027 High Performance Digital FM Transmitter for Portable Devices ________ General Description ________ The QN8027 is a high performance, low power, fullfeatured single-chip stereo FM transmitter designed for portable audio/video players, automotive accessories, cell phones, and GPS personal navigation devices. The QN8027 covers frequencies from 76 MHz to 108 MHz in 50/100/200 kHz step sizes for worldwide FM band support. The QN8027 also supports RDS/RBDS data transmit. The QN8027 integrates a complete transmitter function, from stereo audio input to RF antenna port, for worldwide FM band personal area broadcasting. It includes variable input gain programming, selectable pre-emphasis, precision low-spur MPX stereo encoding and pilot tone generation, low-noise PLL-based modulation, and an on-chip power amplifier with variable output level and RF band-pass filtering to ensure optimum transmit spectrum purity. An integrated crystal oscillator and on-chip digital calibration circuits eliminate external tuning components and enable tuning-free manufacturing. Support for 12/24MHz reference clocks allows the chip to use readily available system clocks. Integrated saturation detection and a programmable audio interface eliminate distortion, optimize audio fidelity, and support a wide range of input audio levels. A low power IDLE mode extends battery life. An integrated LDO enables direct connection to the battery and provides high PSRR for superior noise suppression, in particular ...