Datasheet > U2895B

U2895B

更新时间： 2024-09-23 22:18:27

品牌	Logo	应用领域
其他 - ETC		过程控制系统分布式控制系统 PCS GSM DCS
页数	文件大小	规格书
16页	804K
描述
Modulation PLL for GSM, DCS and PCS Systems

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U2895B 数据手册

U2895B

Modulation PLL for GSM, DCS and PCS Systems

Description

The U2895B is a monolithic integrated circuit. It is band noise is very low. The U2895B exhibits low power

realized using TEMIC’s advanced silicon bipolar UHF5S consumption. Broadband operation gives high flexibility

technology. The device integrates a mixer, an I/Q modu- for multi-band frequency mappings. The IC is available

lator, a phase-frequency detector (PFD) with two in a shrinked small-outline 28-pin package (SSO28).

synchronous programmable dividers, and a charge pump.

The U2895B is designed for cellular phones such as

Electrostatic sensitive device.

GSM900, DCS1800, and PCS1900, applying a trans-

Observe precautions for handling.

mitter architecture at which the VCO operates at the TX

output frequency. No duplexer is needed since the out-of-

Features

Benefits

Supply voltage range 2.7 V to 5.5 V

Novel TX architecture saves filter costs

Current consumption 50 mA

Extended battery operating time without duplexer

Less board space (few external components)

VCO control without voltage doubler

Small SSO28 package

Power-down functions

High-speed PFD and charge pump (CP)

Small CP saturation voltages (0.5/0.6 V)

Programmable dividers and CP polarity

Low-current standby mode

One device for all GSM bands

Block Diagram

MDLO Q NQ PUMIX PU MIXO MIXLO

28 27

25 20

Voltage

reference

90°

NRF

MDO

Mixer

NMDO

I/Q modulator

VSP

CPO

divider

NND

Charge

pump

MUX

PFD

divider

NRD

VS1

VS2

VS3

Mode

control

18 24

GND

15048

CPC

GNDP

Figure 1. Block diagram

Rev. A3, 30-Sep-98

1 (16)

12 3 4 5 6 7...16

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