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PDF QN8025 Data sheet ( Hoja de datos )
| Número de pieza | QN8025 | |
| Descripción | Single-Chip Low-Power FM Receiver | |
| Fabricantes | Quintic | |
| Logotipo |  |
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QN8025
Single-Chip Low-Power FM Receiver for Portable Devices
________ General Description ________ _________Typical Applications________
The QN8025 is a high performance, low power, full-
featured single-chip stereo FM receiver designed for cell
phones, MP3 players, and portable radios. The QN8025 also
supports RDS/RBDS data reception.
• Cell Phones / PDAs / Smart Phones
• Portable Audio & Media Players
• MP3/MP4 player, PMP, PND
• GPS Personal Navigation Devices
• Automotive and Accessories
_______________________________ Key Features ___________________________
• Worldwide FM Band Coverage
• 62 MHz to 108 MHz full band tuning in
50/100/200 kHz step sizes
• 50/75µs de-emphasis
• Ease of Integration
• Small footprint, available in 2.5 x2.5 QFN16 and
4x4 QFN24 packages
• 32.768 kHz and MHz crystal and direct clock input
supported
• I2C control interface
• Very Low Power Consumption
• 15 mA typical
• Integrated LDO
• VIO: 1.6~3.3V, VCC: 2.7~5.0V
• Power saving IDLE and Standby modes
• Low shutdown leakage current
• Volume control
QN8025 Functional Blocks:
• Adaptive Noise Cancellation
• Mono/stereo blend
• High cut
• Soft mute
• High Performance
• Superior sensitivity, better than 1.78µVEMF
• 62dB stereo SNR, 0.05% THD
• Integrated audio processing (SNC, HCC, SM)
• Auto channel seek
• L/R separation 45dB
• RDS/RBDS
• Supports US and European data services
• Robust Operation
• -250C to +850C operation
• ESD protection on all input and output pads
RX ANT
ARO
De De De
RFI
Mod MPX Emph
ALO
2.7 – 5.0V Vcc
10µF
LDO
Voltage
Regulator
Crystal
Oscillator
RDS
PHY
DSP FSM
Control Interface
Ordering Information appears at Section 7.
Controller
Rev 0.34 (05/09)
Copyright ©2009 by Quintic Corporation
Page 1
Confidential A
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 ELECTRICAL SPECIFICATIONS
Table 2: Absolute Maximum Ratings
SYMBOL
PARAMETER
Vbat Supply voltage
VIO Logic signal level
Ts Storage temperature
CONDITIONS
VCC to GND
CEN, SCL, SDA, INT
to GND
MIN
-0.3
-0.3
-55
QN8025
MAX
5
3.6
+150
UNIT
V
V
oC
Table 3: Recommended Operating Conditions
SYMBOL
PARAMETER
CONDITIONS
Vcc Supply voltage
VCC to GND
TA Operating temperature
RFin RF input level1
VIO Digital I/O voltage
Notes:
1. At RF input pin, RFI.
Peak input voltage
MIN
2.7
-25
1.6
TYP
3.3
MAX
5.0
+85
0.3
3.6
UNIT
V
oC
V
V
Rev 0.34 (05/09)
Copyright ©2009 by Quintic Corporation
Page 5
Confidential A
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 
QN8025
The following figure is measured at FM=88MHz . The RSSI Curve is not varied by FM frequency.
Figure 5 RSSI vs RF Input
3.2 Audio Processing
In receive mode, stereo noise cancellation (SNC) for FM
only, high cut control (HCC) and soft mute (SM) are
The MPX signal after FM demodulation is comprised of
supported. Stereo noise suppression is achieved by
left and right channel signal, pilot and RDS signal in the
gradually combining the left and right signals to be a
following way:
mono signal as the received signal quality degrades.
SNC, HCC and SM are controlled by SNR and multipath
m (t ) = [L(t ) + R (t)] + [L(t ) − R (t)]cos( 4πft + 2θ 0 ) + α cos( 2πft + θ 0 ) + d (t ) cos( 6πft + 3θ 0c)hannel estimation results. The three functions will be
archived automatically in the device.
Here, L(t) and R(t) correspond to the audio signals on the
left and right channels respectively, f = 19 kHz, θ is the
initial phase of pilot tone and α is the magnitude of the
pilot tone, and d(t) is the RDS signal. In stereo mode,
both L and R are recovered by de-MPX. In mono mode,
only the L+R portion of audio signal exists. L(t) and R(t)
are recovered by de-MPX.
The QN8025 has an integrated mono or stereo audio
status indicator. There is also a Read ST_MO_RX
(Reg04h [0]) bit to get sound information. In addition,
there also is a force mono function to constrain output
mono in Reg04h.
To improve the signal-to-noise ratio of the FM receiver
by reducing the effect of high frequency interference and
noise, the device integrates a technique called de-
emphasis. There are two selectable time constants (75us
and 50us) supported.
Rev 0.34 (05/09)
Copyright ©2009 by Quintic Corporation
Page 11
Confidential A
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 40 Páginas | |
| PDF Descargar | [ Datasheet QN8025.PDF ] | |
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