U2733B-C
Pin Description
PD
VD
PLCK
REF
NREF
ADR
SCL
SDA
NFDO
FDO
1
2
3
4
5
6
7
8
9
10
12484
20
V
S
19 GND
18 RF
17 NRF
16 SWH
15 SWG
14 SWF
13 SWE
12 SWD
11 SWC
Figure 2. Pinning
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
2 (14)
Preliminary Information
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4
5
6
7
8
9
REF
NREF
ADR
SCL
SDA
NFDO
FDO
10
11
SWC
12
13
14
15
16
17
18
19
20
SWD
SWE
SWF
SWG
SWH
NRF
RF
GND
V
S
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.
TELEFUNKEN Semiconductors
Rev. A1, 21-Aug-96
Pin
1
2
3
Symbol
PD
VD
PLCK
Function
Three-state charge pump output
Active filter output
Lock indicating output
(open collector)
Reference input
Reference input (inverted)
Address selection
Clock (I
2
C)
Data (I
2
C)
Frequency doubler output
(inverted, open collector)
Frequency doubler output
(open collector)
Switching output
(opencollector)
Switching output
(open collector)
Switching output
(open collector)
Switching output
(open collector)
Switching output
(open collector)
Switching output
(open collector)
RF input (inverted)
RF input
Ground
Supply voltage
TEMIC [ TEMIC SEMICONDUCTORS ]
