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PDF QN8027 Data sheet ( Hoja de datos )
| Número de pieza | QN8027 | |
| Descripción | High Performance Digital FM Transmitter | |
| Fabricantes | Quintic | |
| Logotipo |  |
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QN8027
High Performance Digital FM Transmitter for Portable Devices
________ General Description ________ ___________ Key Features __________
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.
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.
ESD protection is on all pins. The QN8027 is fabricated in
highly reliable CMOS technology.
• Worldwide FM Band Transmit
• 76 MHz to 108 MHz full band tuning in
50/100/200 kHz step sizes
• 50/75µs pre-emphasis
• 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
• I2C interface
• Very Low Power Consumption
• 6.5 mA of FCC output level
• Integrated voltage regulator, direct connect to battery
• Power saving IDLE mode
• High Performance FM Transmitter (FMT)
• 63dB Stereo SNR, 0.05% THD
• Maximum 121 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
• -250C to +850C operation
• ESD protection on all input and output pads
_____________________________ Typical Applications __________________________
Cell Phones / PDAs / Smart Phones
Portable Audio & Media Players
GPS Personal Navigation Devices
Automotive and Accessories
Rev 0.26 (04/09)
Copyright ©2009 by Quintic Corporation
Page 1
Confidential Information contained herein is covered under Non-Disclosure Agreement (NDA). Advance Technical Information.
This is a product under development. Characteristics and specifications are subject to change without notice.
Free Datasheet http://www.datasheet4u.com/
1 page  
2 PIN ASSIGNMENTS
QN8027
XTAL2
XTAL1
VCC
GND
RFO
1
2
3
4
5
10 ALI
9 ARI
8 VIO
7 SDA
6 SCL
(Top View)
Figure 2: QN8027 Device Pin Out
Table 1: Pin Descriptions
PINS
1
2
3
4
5
6
7
8
9
10
NAME
XTAL2
XTAL1
VCC
GND
RFO
SCL
SDA
VIO
ARI
ALI
DESCRIPTION
On-chip crystal driver port 2.
If using an external clock source, connect this pin to ground.
On-chip crystal driver port 1.
If using an external clock source, connect this pin to inject the clock.
Voltage supply
Ground
Transmitter RF output – connect to matched antenna.
Clock for I2C serial bus.
Bi-directional data line for I2C serial bus.
IO voltage – specifies voltage limit for all digital pins.
Analog audio input – right channel
Analog audio input – left channel
Rev 0.26 (04/09)
Copyright ©2009 by Quintic Corporation
Page 5
Confidential Information contained herein is covered under Non-Disclosure Agreement (NDA). Advance Technical Information.
This is a product under development. Characteristics and specifications are subject to change without notice.
Free Datasheet http://www.datasheet4u.com/
5 Page 
4 FUNCTIONAL DESCRIPTION
QN8027
The QN8027 is a high performance low power single chip FM transmitter IC that supports worldwide FM broadcast band
operation. It has an IDLE mode for saving power. RDS/RBDS data service is also supported.
4.1 Transmit Mode
The QN8027 transmitter uses a highly digitized architecture. The input left and right analog audio signals are first
adjusted by VGA, and then digitized by two high resolution ADCs into the digital domain. Pre-emphasis and MPX
encoding are then performed. If RDS mode is enabled, the RDS signal will also be mixed with the MPX signal and the
combined output will be fed into a high performance digital FM modulator which generates FM signal at RF carrier
frequency. The FM signal is then filtered and amplified by the PA.
The QN8027 can deliver up to 121dBµV output signal to an external antenna and/or matching network. An RF VGA
provides a 42dB output power control range in 0.75 dB steps and can be programmed through the serial control bus. Output
power control and in-band power flatness can be easily achieved by a calibration circuit. This wide range of control allow
for various antenna configurations such as loop, monopole, or meandering traces on PCB. An integrated RF bandpass filter
ensures optimal output spectrum purity.
4.2 Idle Mode
The QN8027 features a low power IDLE mode for fast turn around and power savings. After power up, the QN8027 will
enter IDLE mode automatically.
4.3 Audio Interface
The QN8027 has a highly flexible analog audio interface. For audio input, the signal is AC coupled with 3dB corner
frequency less than 50Hz. It has 4 different input impedances and 15dB adjustable gain range. Digital gain provides more
accurate gain control (in 1dB steps) to optimize the SNR and linearity. The gain setting can be manually set through the
serial interface.
4.4 Audio Processing
The QN8027 supports audio AGC, programmable pre-emphasis. When there is no audio signal for a pre-determined
period, AGC will power down the transmitter. A peak detector is also integrated to measure the input audio level. User
can program VGA based on the peak value.
Stereo signal is generated by the MPX circuit. It combines the left and right channel signals in the following way:
m (t ) = [L(t ) + R (t )] + [L(t ) − R (t )]cos( 4πft + 2θ 0 ) + α cos( 2πft + θ 0 ) + d (t ) cos( 6πft + 3θ 0 )
Here, L(t) and R(t) correspond to the audio signals on left and right channels respectively, f = 19 kHz, θ is the initial phase
of pilot tone and α is the magnitude of pilot tone, and d(t) is RDS signal. In mono mode, only the L+R portion of audio
signal is transmitted. The 19 kHz pilot tone is generated by the MPX circuit which contributes 9% of peak modulation,
and RDS signal will contribute 2.1% of peak modulation.
Rev 0.26 (04/09)
Copyright ©2009 by Quintic Corporation
Page 11
Confidential Information contained herein is covered under Non-Disclosure Agreement (NDA). Advance Technical Information.
This is a product under development. Characteristics and specifications are subject to change without notice.
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet QN8027.PDF ] | |
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