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PDF BK1086 Data sheet ( Hoja de datos )
| Número de pieza | BK1086 | |
| Descripción | (BK1086 / BK1088) BROADCAST AM/FM/SW/LW RADIO RECEIVER | |
| Fabricantes | BEKEN | |
| Logotipo |  |
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BK1086/88
BROADCAST AM/FM/SW/LW RADIO RECEIVER
Features
Worldwide 64~108 MHz FM band
support
Worldwide 520~1710kHz AM band
support
SW band support(2.3-21.85MHz,
BK1088 only)
LW band support(153-279kHz,BK1088
only)
Automatic gain control(AGC)
Automatic frequency control(AFC)
Digital FM stereo decoder
Automatic FM stereo/mono blend
Automatic noise suppression
50us/75us de-emphasis
RDS/RBDS decoder
2.4 ~ 5.5 V supply voltage
Wide range reference clock support
32.768KHz crystal oscillator
4x4 mm 24-pin QFN package
Applications
Table and portable radios
CD/DVD players
Modules
General Description
The BK1086/88 AM/FM receiver employs a
low-IF architecture, mixed signal image
rejection and all digital demodulation
technology. The station scan of BK1086/88
searches radio stations based on both the
channel RSSI estimation and signal quality
assessment, increases the number of receivable
stations while avoids false stops. BK1086/88
enables FM/AM/SW/LW radio reception with
low power, small board space and minimum
number of external component.
24 23 22 21 20 19
GND 1
18 VA
FMI 2
RFGND 3
GND PAD
17 GND
16 LOUT
AMI 4
BK1086/88
15 ROUT
GND 5
14 GND
NC 6
13 VD
7 8 9 10 11 12
QFN 24 Pin Assignments (Top View)
Functional Block Diagram
FM ANT
FM LNA
MIXER
RFGND
AM LNA
MIXER
Ｉ
PGA
Ｑ
PGA
ADC
ADC
RDS
DSP
DAC LOUT
DAC ROUT
32.768KHz
VDD
AUTO
TUNE
0/90
DPLL
APLL
REG BK1086/88
GPIO
SDIO
SEN
SCLK
VIO
Rev.1.0
Copyright©2010 by Beken Corporation
BK1086/88
Beken Confidential. Information contained herein is covered under non-disclosure agreement (NDA).
Free Datasheet http://www.datasheet4u.net/
1 page  
2.4 Stereo Audio Processing
The output of the FM demodulator is a
stereo multiplexed (MPX) signal. MPX
signal format consists of left + right
(L+R) audio, left – right (L–R) audio, a
19 kHz pilot tone, and RDS data.
The BK1086/88 has integrated stereo
decoder automatically decodes the MPX
signal. The 0 to 15 kHz (L+R) signal is
the mono output of the FM tuner. Stereo
is generated from the (L+R), (L-R), and
a 19 kHz pilot tone. The pilot tone is
used as a reference to recover the (L-R)
signal. Separate left and right channels
are obtained by adding and subtracting
the (L+R) and (L-R) signals,
respectively. Adaptive noise suppression
is employed to gradually combine the
stereo left and right audio channels to a
mono (L+R) audio signal as the signal
quality degrades to maintain optimum
sound fidelity under varying reception
conditions. The signal level range over
which the stereo to mono blending
occurs can be adjusted by setting the
BLNDADJ [1:0] register. Stereo/mono
status can be monitored with the ST
register bit and mono operation can be
forced with the MONO register bit and
stereo operation can be forced with the
STEREO register bit.
BK1086/88 uses pre-emphasis and de-
emphasis to improve the signal-to-noise
ratio of FM receivers by reducing the
effects of high frequency interference
and noise. When the FM signal is
transmitted, a pre-emphasis filter is
applied to accentuate the high audio
frequencies. All FM receivers
incorporate a de-emphasis filter which
attenuates high frequencies to restore a
BK1086/88
flat frequency response. Two time
constants, 50 or 75μs, are used in
various regions. The de-emphasis time
constant is programmable with the DE
bit. High-fidelity stereo digital-to-analog
converters (DACs) drive analog audio
signals onto the LOUT and ROUT pins.
The audio output may be muted with the
DMUTE bit. Volume can be adjusted
digitally with the VOLUME [4:0] bits.
The soft mute feature is available to
attenuate the audio outputs and minimize
audible noise in very weak signal
conditions. The soft mute attack and
decay rate can be adjusted with the
SMUTER [1:0] bits where 00 is the
fastest setting. The soft mute attenuation
level can be adjusted with the SMUTEA
[1:0] bits where 00 is the most
attenuated. The soft mute disable
(DSMUTE) bit may be set high to
disable this feature.
2.5 Seek/Tune System
In FM mode, channel spacing of 10， 50,
100 or 200 kHz is selected with bits
SPACE [1:0]. The channel is selected
with bits CHAN [14:0]. The bottom of
the band is set to 64 MHz, 76 MHz or 87
MHz with the bits BAND [1:0]. The
tuning operation begins by setting the
TUNE bit. After tuning completes, the
seek/tune complete (STC) bit will be set
and the RSSI level is available by
reading bits RSSI [6:0]. The TUNE bit
must be set low after the STC bit is set
high in order to prepare for the next tune
operation and clear the STC bit. Seek
tuning searches up or down for a channel
with RSSI greater than the seek
threshold set with the SEEKTH [6:0]
bits and SNR greater than the SNR
threshold set with the SKSNR [6:0] bits.
Proprietary and Confidential
Page 5 of 30
Free Datasheet http://www.datasheet4u.net/
5 Page 
3.4 I2C Control Interface Characteristics
Table 4 I2C Control Interface Characteristics
Parameter
SCLK Frequency
SCLK Low Time
SCLK High Time
SCLK Input to SDIO ↓
Setup (START)
SCLK Input to SDIO ↓
Hold (START)
SDIO Input to SCLK ↑
Setup
SDIO Input to SCLK ↓
Hold
SCLK Input to SDIO ↑
Setup (STOP)
STOP to START Time
SDIO Output Fall Time
SDIO Input, SCLK
Rise/Fall Time
SCLK, SDIO Capacitive
Loading
Input Filter Pulse
Suppression
Symbol
fSCL
tLOW
tHIGH
tSU:STA
tHD:STA
tSU:DAT
tHD:DAT
tSU:STO
tBUF
tf:OUT
tf:IN
tr:IN
Cb
tSP
Test Condition
Min
—
1.3
0.6
0.6
0.6
100
—
0.6
1.3
—
—
—
—
tSU:STA tHD:STA
tLOW
tHIGH
tr:IN tf:IN
tSP
BK1086/88
Typ
Max
Unit
— 400 kHz
— — μs
μs
— — μs
— — μs
— — ns
— 900 ns
— — μs
— — μs
— 250 ns
— 200 ns
— 60 pF
— 40 ns
tSU:STO tBUF
SCLK
//
SDIO
START
tr:IN
tHD:DAT tSU:DAT
//
//
tf:IN,
tf:OUT
STOP START
Figure 5 I2C Control Interface Read and Write Timing Diagram
Proprietary and Confidential
Page 11 of 30
Free Datasheet http://www.datasheet4u.net/
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet BK1086.PDF ] | |
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