QN8027
High Performance Digital FM Transmitter for Portable Devices
________ General Description ________
The QN8027 is a high performance, low power, full-
featured 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 TDMA noise from GSM/GPRS phones.
___________ Key Features __________
•
Worldwide FM Band Transmit
•
76 MHz to 108 MHz full band tuning in
50/100/200 kHz step sizes
•
50/75
μ
s pre-emphasis
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18
深
ESD protection is on all pins. The QN8027 is fabricated in
highly reliable CMOS technology.
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The QN8027’s small footprint, high integration with
minimum external component count, and support for
12/24MHz clock frequencies make it easy to integrate into
a variety of small form-factor low-power portable
applications.
Integrated low-phase noise digital
synthesizers and extensive on-chip auto calibration ensures
robust consistent performance over temperature and
process variations. An integrated voltage regulator enables
direct connection to a battery and provides high PSRR for
superior noise suppression. A low-power IDLE mode
extends battery life.
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_____________________________
Typical Applications __________________________
GPS Personal Navigation Devices
Automotive and Accessories
Cell Phones / PDAs / Smart Phones
Portable Audio & Media Players
Rev 1.1 (04/10)
Copyright ©2010 by Quintic Corporation
Confidential Information contained herein is covered under Non-Disclosure Agreement (NDA).
66
43
•
Low Power Consumption
•
7.0 mA of FCC output level
•
Integrated voltage regulator, direct connect to battery
•
Power saving IDLE mode
•
High Performance FM Transmitter (FMT)
•
65dB Stereo SNR, 0.04% THD
•
Maximum 119 dBuVp RF output level with 42dB
adjustable range
•
Automatic Input Audio Sensing
•
RF power automatically turned off if no input
audio signal for 60s
•
RDS/RBDS Transmit
•
Supports US and European data service,
including TMC (Traffic Messaging Channel)
•
Robust Operation
•
-25
0
C to +85
0
C operation
•
ESD protection on all input and output pads
41
58
5，
•
Ease of Integration
•
Small footprint, 3 x 3 x 0.95mm MSOP10
•
Only 2 external passive components required
•
Adaptive antenna tuning
•
Low cellular and GPS band spurs
•
High Immunity to TDMA (GSM/GPRS) burst noise
•
Multiple crystal frequencies supported
•
I
2
C interface
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