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參數(shù)資料
| 型號： | 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)： | 2/14頁 |
| 文件大?。?/td> | 157K |
| 代理商： | U2733B-C |
U2733B-C
TELEFUNKEN Semiconductors
Rev. A1, 21-Aug-96
Preliminary Information
2 (14)
Pin Description
1
2
3
4
5
6
7
8
10
9
19
18
17
16
14
15
13
12
11
20
REF
NREF
12484
ADR
SCL
SDA
NFDO
VD
PLCK
NRF
SWH
SWG
SWF
SWE
SWD
GND
RF
FDO
SWC
PD
V
S
Figure 2. Pinning
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(open collector)
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8
9
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11
SDA
NFDO
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SWC
2
Data (I
2
C)
Frequency doubler output
Switching output
(opencollector)
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14
SWF
16
SWH
Switching output
20
V
Supply voltage
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Functional Description
The U2733B-C is a low power fractional-N frequency
synthesizer designed for applications in DAB receivers.
Its RF operation range reaches from 70 MHz up to
500 MHz. The device includes input buffers for reference
and RF dividers, a reference divider, a programmable RF
divider using fractional-N technique, a tri-state phase
detector, a programmable charge pump, six switching
outputs, a frequency doubler for the reference input signal
and a control unit. The control unit has to be accessed by
a micro controller via I
2
C bus. The programming
information is stored in a set of internal registers.
The basic difference of this circuit from the U2753B-C is
the use of a special phase noise shaping technique based
on the fractional-N principle which concentrates the
phase detector’s phase noise contribution to the spectrum
of the controlled VCO at frequency positions where it
doesn’t damage the quality of the received DAB signal.
In critical locations of the VCO’s frequency spectrum the
phase detectors phase noise contribution is reduced by
roughly 12 dB. A special property of the transmission
technique which is used in DAB is that the phase noise
weighting function which measures the influence of the
LO’s phase noise to the phase information of the coded
signal in a DAB receiver has zeros, i.e., if phase noise is
concentrated in the position of such zeros as discrete lines
the DAB signal is not disturbed as long as these lines don’t
exceed a certain limit.
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