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TEMIC Semiconductors
TEMIC Semiconductors

U2733B-C Datasheet Preview

U2733B-C Datasheet

Fractional-N Frequency Synthesizer

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U2733B-C
Fractional-N Frequency Synthesizer for DAB Tuner
Description
The U2733B-C is a monolithically integrated
fractional-N frequency synthesizer circuit fabricated in
TEMIC’s advanced UHF5S technology. Designed for
applications in DAB receivers, it controls a VCO to
synthesize frequencies in the range of 70 to 500 MHz in
a 16 kHz raster; four different reference divide factors can
be selected. The lock status of the phase detector is
indicated at a special output pin, six switching outputs can
be addressed. An internal frequency doubler provides an
output signal having twice the frequency of the reference
oscillator. All functions of this IC are controlled by
I2C bus.
Features
D Microprocessor controlled via I2C bus
D 4 addresses selectable
D Four reference divide factors selectable:
1024, 1120, 1152, 1536
D Effectively
D Programmable 15-bit counter 1:2048 to 1:32767
effectively
D Three state phase detector with programmable charge
pump
D Superior phase noise performance
D Deactivation of tuning output programmable
D 6 switching outputs (open collector)
D Reference frequency doubler (open collector output)
D Lock status indication (open collector)
D Fully compatible to U2753B-C
D SSO20 package
Block Diagram
REF
NREF
4
5
RF
NRF
18
17
Frequency doubler
x2
FDO NFDO
10 9
Reference counter
Fractional N
control
Prog.
13 Bit counter
N/N=1
Three State
Phase
Detector
Lock detector
Prog.
charge pump
4 Bit latch
3
PLCK
1
PD
2
VD
7 Bit latch
2 Bit
latch
5 Bit latch
I2C Bus –Interface / Control
MUX
MUX
Switches
19 20
GND VS
67
8 11 12 13 14 15 16
ADR
SCL
SDA
SWC SWD SWE SWF SWG SWH
12476
Figure 1. Block diagram
TELEFUNKEN Semiconductors
Rev. A1, 21-Aug-96
Preliminary Information
1 (14)



TEMIC Semiconductors
TEMIC Semiconductors

U2733B-C Datasheet Preview

U2733B-C Datasheet

Fractional-N Frequency Synthesizer

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U2733B-C pdf
U2733B-C
Pin Description
PD
VD
PLCK
REF
NREF
ADR
SCL
1
2
3
4
5
6
7
20 VS
19 GND
18 RF
17 NRF
16 SWH
15 SWG
14 SWF
SDA
8
13 SWE
NFDO
FDO
9 12 SWD
10 11 SWC
12484
Figure 2. Pinning
Pin Symbol
Function
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ1 PD Three-state charge pump output
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ2 VD Active filter output
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ3 PLCK Lock indicating output
(open collector)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ4 REF Reference input
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ5 NREF Reference input (inverted)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ6 ADR Address selection
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ7 SCL Clock (I2C)
8 SDA Data (I2C)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ9 NFDO Frequency doubler output
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ(inverted, open collector)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ10 FDO Frequency doubler output
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ(open collector)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ11 SWC Switching output
(opencollector)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ12 SWD Switching output
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ(open collector)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ13 SWE Switching output
(open collector)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ14 SWF Switching output
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ(open collector)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ15 SWG Switching output
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ(open collector)
16 SWH Switching output
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ(open collector)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ17 NRF RF input (inverted)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ18 RF RF input
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ19 GND Ground
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ20 VS Supply voltage
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 I2C 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.
2 (14)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 21-Aug-96


Part Number U2733B-C
Description Fractional-N Frequency Synthesizer
Maker TEMIC Semiconductors
Total Page 14 Pages
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