U2896B

Rev. A1, 18-Sep-98

1 (13)

Preliminary Information

Modulation PLL for GSM, DCS and PCS Systems

Description

The U2896B is a monolithic integrated circuit. It is

realized using TEMIC’s advanced silicon bipolar UHF5S

technology. The device integrates a mixer, an I/Q

modulator, a phase-frequency detector (PFD) with two

synchronous programmable dividers, and a charge pump.

The U2896B is designed for cellular phones such as

GSM900,

DCS1800,

and

PCS1900,

applying

a

transmitter architecture at which the VCO operates at the

TX output frequency. No duplexer is needed since the

out-of-band noise is very low. The U2896B exhibits low

power consumption. Broadband operation gives high

flexibility for multi-band frequency mappings. The IC is

available in a shrinked small-outline 36-pin package

(SSO36).

Electrostatic sensitive device.

Observe precautions for handling.

Features

D Supply voltage range 2.7 V to 5.5 V

D Current consumption 50 mA

D Power-down functions

D High-speed PFD and charge pump (CP)

D Small CP saturation voltages (0.5/0.6 V)

D Programmable dividers and CP polarity

D Low-current standby mode

Benefits

D Novel TX architecture saves filter costs

D Extended battery operating time without duplexer

D Less board space (few external components)

D VCO control without voltage doubler

D Small SSO36 package

D One device for all GSM bands

Block Diagram

1:2

N

22

21

15

16

MUX

90

°

Modulator

7

8

I NI

Q NQ

PU

NMIXOMIXO

32

33

23

35

36

2

1

Mixer

PFD

Charge

pump

14

13

31

28

10

11

27

26

RF

NRF

VSP

CPO

VS2

MDO

NMDO

ND

NND

RD

NRD

MC

GND2

CPCL

CPCH

14891

VS1 GND1

5

6

LO

4

3

MDLO

NMDLO

34

25

30

GND3

24

NMIXLO

29

VS3

12

GNDP

17

1:2

R

PUMIX MIXLO

Mode control

Figure 1. Block diagram