- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄382702 > U2733B-C Fractional-N Frequency Synthesizer for DAB Tuner PDF資料下載
參數(shù)資料
| 型號(hào)： | U2733B-C |
| 英文描述： | Fractional-N Frequency Synthesizer for DAB Tuner |
| 中文描述： | 分?jǐn)?shù)N頻率合成器的DAB調(diào)諧器 |
| 文件頁數(shù)： | 4/14頁 |
| 文件大小： | 157K |
| 代理商： | U2733B-C |
U2733B-C
TELEFUNKEN Semiconductors
Rev. A1, 21-Aug-96
Preliminary Information
4 (14)
A high gain amplifier (output pin: VD) which is
implemented in order to construct a loop filter as shown
in the application circuit can be switched off by means of
the I
2
C bus bit ‘OS’.
An internal lock detector checks if the phase difference of
the input signals of the phase detector is smaller than
approximately 250 ns in seven subsequent comparisons.
If phase lock is detected the open collector output pin
PLCK is set ‘H’ (logical value!). It should be noted that
the output current of this pin must be limited by external
circuitry as it is not limited internally. If the I
2
C bus bit
‘TRI’ is set ‘H’ the lock detector function is deactivated
and the logical value of the PLCK output is undefined.
Switching Outputs
Six switching outputs controlled by the I
2
C bus bits
‘SWC’, ‘SWD’, ‘SWE’, ‘SWF’, ‘SWG’, ‘SWH’ can be
used for any switching task on the front end board. The
currents of these outputs are not limited internally. They
have to be limited by external circuitry.
Frequency Doubler
An internal frequency doubler provides a signal at twice
the frequency of the reference signal appearing at the
input pins REF and NREF. If the I
2
C bus bit ‘OFD’ = ‘H’
the current of its open collector outputs FDO and NFDO
is doubled. By means of the I
2
C bus bit ‘OFD’ the
frequency doubler function can be switched off.
As shown on page 15 (Integration in TEMIC DAB
Receiver Concept) the output signal of the frequency
doubler can be used in order to construct the LO signal of
the IF circuit (U2759B).
I
2
C Bus Interface
Via its I
2
C bus interface various functions can be
controlled by a microprocessor. These functions are
overviewed in the following sections ‘I
2
C bus instruction
codes’ and ‘I
2
C bus functions’. By means of the ADR pin
four different I
2
C bus addresses can be selected as
described in the section ‘Electrical characteristics’.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| U2739M | DAB One-Chip Channel- and Source / Data Decoder |
| U2740B | UHF AM/FM Transmitter |
| U2740B-BFP | UHF AM/FM Transmitter |
| U2760B | CT2-RX/TX IC |
| U2760B-AFS | CT2-RX/TX IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| U2739M | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:DAB One-Chip Channel- and Source / Data Decoder |
| U2739M-B | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:DAB One-Chip Channel- and Source Decoder |
| U2739M-BFC | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:DAB One-Chip Channel- and Source Decoder |
| U2739M-BFT | 功能描述:IC DECODER 1CHAN/SOURCE 100-PQFP RoHS:否 類別:集成電路 (IC) >> 線性 - 音頻處理 系列:- 其它有關(guān)文件:STA321 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應(yīng)用:數(shù)字音頻 安裝類型:表面貼裝 封裝/外殼:64-LQFP 裸露焊盤 供應(yīng)商設(shè)備封裝:64-LQFP EP（10x10） 包裝:Digi-Reel® 其它名稱:497-11050-6 |
| U274 | 功能描述:開關(guān)配件 Switch Hardware RoHS:否 制造商:C&K Components 類型:Cap 用于:Pushbutton Switches 設(shè)計(jì)目的: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。