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參數(shù)資料
| 型號： | TEA5762 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Self Tuned Radio STR |
| 中文描述： | 自調諧收音機可疑 |
| 文件頁數(shù)： | 7/32頁 |
| 文件大?。?/td> | 171K |
| 代理商： | TEA5762 |
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1999 Aug 04
7
Philips Semiconductors
Product specification
Self Tuned Radio (STR)
TEA5762
FUNCTIONAL DESCRIPTION
The TEA5762 is an integrated radio circuit with
AM-receiver and FM-IF part with demodulator and stereo
decoder. The circuit includes digital tuning and control
functions.
The radio
The AM circuit incorporates a double balanced mixer, a
one-pin low-voltage oscillator (up to 30 MHz) and is
designed for distributed selectivity.
The AM input is designed to be connected to the top of a
tuned circuit. AGC controls the IF amplification and for
large signals it lowers the input impedance of the AM
front-end.
The first AM selectivity can be an IF-Tank (IFT) as well as
an IFT combined with a ceramic filter; the second one is an
IFT.
For FM operation an external FM front-end is necessary.
This is switched on and off by the FM-ON/OFF signal
which is generated in the bus system.
The AFC circuit in the TEA5762 provides a tuning voltage
to drive the VCO of the external FM front-end.
The frequency of the external VCO is counted in the Self
Tuned Radio (STR) tuning system.
The FM-IF circuit is designed for distributed IF ceramic
filters. The FM quadratic detector uses a ceramic
resonator.
The PLL stereo decoder incorporates a signal dependent
stereo-blend circuit and a soft-mute circuit.
Tuning
Thetuning-concept ofSelf TunedRadio(STR)isbasedon
FUZZY LOGIC: it mimics hand tuning (hand tuning is a
combination of coarse and fine tuning to the qualitatively
best frequency position). As a consequence the tuning
system is very fast.
The tuning algorithm, which is controlled by the sequential
circuit (see Fig.1), is completely integrated; so there are
only a few external components needed.
The bus and the microcontroller can be kept very simple.
The bus only consists of three wires (BUS-CLOCK, DATA
and WRITE-ENABLE). The microcontroller must basically
give two instructions:
Preset operation
Search operation.
P
RESET OPERATION
In preset mode, the microcontroller has to load information
such as frequency band, frequency and mono/stereo. This
information has to be sent via the bus to the STR.
The internal algorithm controls the tuning sequence as
follows:
1.
The information is loaded into a shift register, a
last-station memory and the counter.
2.
The Automatic Frequency Control (AFC) is switched
off.
3.
The counter starts counting the VCO frequency and
the tuning voltage is varied until the desired frequency
roughly equals the real frequency.
4.
The AFC is then switched on and the counter is
switched off.
5.
The real frequency is more precisely tuned to the
desired frequency.
After the AFC has tuned the real frequency to the desired
frequency an in-lock signal can be generated. In order to
get a reliable in-lock signal, there are two parameters
measured: the field strength and the S-curve. The field
strength indicates the strength of the station and by
looking at the S-curve the system can distinguish false
in-locks from real in-locks (false in-locks occur on the
wrong slope of the S-curve).
In the FM mode the tuning voltage controls the VCO of the
external FM front-end and the frequency of the VCO is
counted in the TEA5762.
In the event of fading or pulling the in-lock signal becomes
logic 0 and the synthesizer will be switched-on again and
the algorithm will be repeated.
S
EARCH OPERATION
During a search operation, the only action the
microcontroller has to take is: sending the desired band
plus the direction and the search sensitivity level to the
STR. The search operation is performed by the charge
pump until an in-lock signal is generated (combination of
measuring the field strength and the S-curve). The AFC
then fine tunes to the station. The frequency belonging to
the found station will be counted by the counter and written
into the last-station memory and the shift register of the
counter. At this time the frequency is available in the shift
register and can be read by the microcontroller. The
microcontrollerdecideswhetherthefrequencyiswithinthe
desiredfrequencyband.Ifso,thisfrequencycanbestored
under a preset and if not, a new search action should be
started.
相關PDF資料 |
PDF描述 |
|---|---|
| TEA5762H | Self Tuned Radio STR |
| TEA5767 | single-chip FM stereo radio |
| TEA6000 | FM/IF SYSTEM AND MICROCOMPUTER-BASED TUNING INTERFACE |
| TEA6300 | Sound fader control circuit |
| TEA6300T | Sound fader control circuit |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TEA5762H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Self Tuned Radio STR |
| TEA5762H/V1,518 | 功能描述:調諧器 SELF TUNED RADIO RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度: |
| TEA5762H/V1,557 | 功能描述:調諧器 SELF TUNED RADIO RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度: |
| TEA5762H1GE | 功能描述:IC SELF TUNED RADIO 44-PQFP RoHS:是 類別:RF/IF 和 RFID >> RF 接收器 系列:STR 產品培訓模塊:Lead (SnPb) Finish for COTS 產品變化通告:Product Discontinuation 09/Jan/2012 標準包裝:50 系列:* 頻率:850MHz ~ 2.175GHz 靈敏度:- 數(shù)據(jù)傳輸率 - 最大:- 調制或協(xié)議:- 應用:* 電流 - 接收:* 數(shù)據(jù)接口:PCB，表面貼裝 存儲容量:- 天線連接器:PCB，表面貼裝 特點:- 電源電壓:4.75 V ~ 5.25 V 工作溫度:0°C ~ 85°C 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| TEA5762H1UM | 功能描述:IC SELF TUNED RADIO 44QFP RoHS:是 類別:RF/IF 和 RFID >> RF 接收器 系列:STR 產品培訓模塊:Lead (SnPb) Finish for COTS 產品變化通告:Product Discontinuation 09/Jan/2012 標準包裝:50 系列:* 頻率:850MHz ~ 2.175GHz 靈敏度:- 數(shù)據(jù)傳輸率 - 最大:- 調制或協(xié)議:- 應用:* 電流 - 接收:* 數(shù)據(jù)接口:PCB，表面貼裝 存儲容量:- 天線連接器:PCB，表面貼裝 特點:- 電源電壓:4.75 V ~ 5.25 V 工作溫度:0°C ~ 85°C 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
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