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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鈥檚 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

I

2

C bus.

Features

D

Microprocessor controlled via I

2

C bus

D

4 addresses selectable

D

Four reference divide factors selectable:

1024, 1120, 1152, 1536

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

D

Effectively

D

Programmable 15-bit counter 1:2048 to 1:32767

effectively

D

Three state phase detector with programmable charge

pump

Block Diagram

FDO

10

Frequency doubler

x2

Lock detector

REF

NREF

4

5

Reference counter

Three State

Phase

Detector

Fractional N

control

2

Prog.

charge pump

VD

1

PD

NFDO

9

3

PLCK

18

RF

NRF

17

Prog.

13 Bit counter

N/N=1

4 Bit latch

7 Bit latch

2 Bit

latch

5 Bit latch

MUX

MUX

I2C Bus 鈥?Interface / Control

Switches

19

20

6

ADR

7

8

11

12

13

14

15

16

GND

VS

SCL

SDA

SWC SWD SWE SWF SWG SWH

12476

Figure 1. Block diagram

TELEFUNKEN Semiconductors

Rev. A1, 21-Aug-96

1 (14)

Preliminary Information

next

U2733B-C相關型號PDF文件下載

• 型號
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• U2730B-B
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• U2730B-N
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• U2731B-M
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  DAB one-chip front end
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• U2733B-C
  英文版
  Fractional-N Frequency Synthesizer for DAB Tuner
  TEMIC
  U2733B-C
• U2733B-C
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  Fractional-N Frequency Synthesizer for DAB Tuner
  
  U2733B-C
• U2739M-B
  英文版
  DAB One-Chip Channel- and Source Decoder
  
  U2739M-B
• U2739M-B
  英文版
  DAB one-chip channel- and source decoder
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• U2730B-BFS
  英文版
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• U2730B-BFS
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• U2731B-NFN
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• U2731B-NFN
  英文版
  DAB ONE- CHIP FRONT END
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