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PDF ( 数据手册 , 数据表 ) KT0922

零件编号 KT0922
描述 Monolithic Dial-tuned AM/FM Receiver
制造商 KTMicro
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KT0922 数据手册, 描述, 功能
Monolithic Dial-tuned AM/FM Receiver
Radio-on-a-Chip™
KT0922
Features
Single-chip AM/FM radio solution
Built-in MCU
Support analog mechanical tuning
Worldwide FM/AM band support
Maximum three FM bands with configurable
aitendofrequency range within 32MHz-110MHz
Configurable AM frequency range within 500KHz -
1710KHz
High Sensitivity
1.6uVEMF for FM
16uVEMF for AM
High Fidelity
SNR (FM/AM): 60dB/55dB
THD: 0.3%
Low Supply Current
25mA (operating)
<15uA (standby)
Integrated stereo indicator
Programmable sensitivity and hysteresis threshold
Integrated tuning indicator
Programmable sensitivity and hysteresis threshold
Low supply voltage
2.2V to 3.6V, can be supplied with 2 AAA batteries
Integrated low power crystal oscillator
Support 32.768KHz and 38KHz crystal
Arbitrary reference clock supported
From 30KHz to 40MHz with 1Hz step
One audio line-in channel
Small form factor SSOP20L package
RoHS Compliant
Applications
Desktop and portable radio, boom box, clock radio, MP3
speaker, campus radio and other applications with
mechanical tuning.
KT0922 System Diagram
Description
The KT0922 is KT Micro’s 2nd generation of proprietary
fully integrated AM/FM receiver chip supporting
mechanical tuning without MCU. The new features include
improved tuning feel, new ST and Tuning light signal,
improved EMI/EMC, improved FM stereo separation and
one audio line-in channel.
Thanks to its advanced architecture, KT0922 offers an
excellent user listening experience with high sensitivity,
high signal-to-noise ratio, low distortion and low sensitivity
to interference.
KT0922 provides direct and simple interface to support
mechanical tuning. A pre-programmed low cost EEPROM
can be used to configure the radio settings to differentiate
product designs and accommodate standards in various
regions. No external MCU is required.
Thanks to its high integration level and efficient user
interface design, KT0922 lowers the system cost, simplifies
design and improves product reliability and
manufacturability. KT0922 can operate with two AAA
batteries, making it ideal for low-power portable radio.
Rev. 1.2
Information furnished by KT Micro is believed to be accurate and reliable.
However, no responsibility is assumed by KT Micro for its use, nor for any
infringements of patents or other rights of third parties which may result from its
use. No license is granted by implication or otherwise under any patent or patent
rights of Beijing KT Micro, Ltd.
Beijing KT Micro, Ltd.
BeiWu New Technology Park, Building #4, 23 BeiWuCun
Road, Haidian District, Beijing, China.
Tel: +86-10-88891955 http://www.ktmicro.com.cn
Fax: +86-10-88891977
Copyright 2012, Beijing KT Micro, Ltd.
www.aitendo.com







KT0922 pdf, 数据表
KT0922
The dial is implemented by a variable resistor with the center tap connected to the
chip. KT0922 measures the ratio of two parts of the variable resistor and maps the
result to the real control parameters, such as channel frequency, volume, etc.
The channel controller enters dial mode by setting register CH_PIN<1:0> to 10. The
illustration circuit is shown in Figure 3. If the center tap of the variable resistor is
located in the white area, the tuned channel could be expressed as:
ftune
X
X Y
( ftop
fbot
2 N guard
f step ) N guard
f step
fbot
Where fstep is the channel step, set by register FM_SPACE<1:0> or
AM_SPACE<1:0>, ftop is the upper bound of the band, fbot is the lower bound of the
band and N guard is the number of guard channel in channel step to prevent mechanical
limit of the wheels. Each band’s guard number can be configured by register
FM1_GUARD<7:0>,
FM2_GUARD<7:0>,
FM3_GUARD<7:0>
and
AM_GUARD<7:0>, separately. When the center tap goes in the shaded guard area,
the tuned channel stays at the upper or lower bound of band.
fbot 86
N guard
fbot 32
N guard
109 ftop
N guard
64 ftop
N guard
Figure 3: CH pin connection in dial-mode
The volume controller enters dial-mode by setting register VOL_PIN<1:0> to 10.
Figure 4 illustrates an application circuit. The actual volume set by the dial could be
expressed as:
VOL(dBFS) [ X
X Y
(64
N guard )]
N guard
2
62
Copyright 2012, Beijing KT Micro, Ltd.
8







KT0922 equivalent, schematic
KT0922
3 FAST_SEP
2:0 Reserved
RW 0
RW 001
Fast separation enable.
0 = Disable.
1 = Enable.
Reserved.
3.9.8. LOCFGA (Address 0x0C)
Bit Symbol
15:9 Reserved
8 FM_AFCD
Access
RW
RW
Default
0010_010
0
7:0 Reserved
RW 0010_0000
Functional Description
Reserved.
FM AFC disable.
0 = Enable FM AFC loop.
1 = Disable FM AFC loop.
Reserved.
3.9.9. PLLCFGA (Address 0x14)
Bit Symbol
15:11 Reserved
10:0 DIVIDERP<10:0>
Access Default
RW 0000_0
RW 000_0000_0001
Functional Description
Reserved.
PLL divider P configuration.
3.9.10. PLLCFGB (Address 0x15)
Bit Symbol
15:11 Reserved
10:0 DIVIDERN<10:0>
Access Default
RW 0000_0
RW 010_1001_1100
Functional Description
Reserved.
PLL divider N configuration.
3.9.11. SYSCLK_CFGA (Address 0x16)
Bit Symbol
Access Default
15:0 XTAL_FREQ<15:0> RW 0x8000
Functional Description
Lower 16 bits of crystal or
reference clock frequency setting.
3.9.12. SYSCLK_CFGB (Address 0x17)
Bit
15
14:10
9:0
Symbol
SYSCLK_CFGOK
Reserved
XTAL_FREQ<25:16>
Access
RW
RW
RW
Default
1
000_00
00_0000_0000
Functional Description
Reserved.
Higher 10 bits of crystal or
reference clock frequency setting.
3.9.13. SYS_CFG (Address 0x1D)
Bit Symbol
Access Default Functional Description
15 Reserved
RW 0
Reserved.
14 AM_BAND_NUM RW
1
AM band number selection.
aitendo0 = FM only.
Copyright 2012, Beijing KT Micro, Ltd.
16










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