U2797B-AFSG3 Datasheet

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TELEFUNKEN Semiconductors

U2797B

1000-MHz Quadrature Modulator

Description

The IC U2797B is a 1000-MHz quadrature modulator that

uses TELEFUNKEN鈥檚 advanced UHF process. It features

a frequency range from 100 MHz up to 1000 MHz, low

current consumption, and single-ended RF and LO ports.

The I/Q input impedance is about 150 k

W

. Adjustment

free application makes the direct converter suitable for all

digital radio systems up to 1000 MHz, e.g., GSM,

DAMPS, PDC.

Features

D

Supply voltage: 5 V (typical)

D

Low power consumption: 30 mA / 5 V (typical at

D

150 k

W

I/Q input impedance

D

Excellent sideband suppression by means of duty

cycle regeneration of the LO input signal

鈥? dBm output level)

D

50-

W

single-ended LO and RF port

D

LO- frequency range of 100 MHz to 1 GHz

D

SSO 20 package

Benefits

D

Extended talk time due to increased battery life

D

Few external components result in cost and board

space saving

D

Phase control loop for precise 90掳 phase shifting

D

Power down mode

D

Low LO input level: 鈥?0 dBm (typical)

D

Adjustment-free hence saves time

Block Diagram

S

PD

BB

Ai

BB

Ai

10

9

8

PD

1 5,6

V

S

Power 7

down

V

13

Ref

14 Duty cycle

regenerator

19

Phase adj.

20

LO

i

BB

Bi

BB

Bi

11

12

94 8185 e

Frequency

doubler

0

掳

90

掳

90

掳

control

loop

M

4

RF

o

2, 3, 15, 16, 17, 18

GND

Ordeing Information

Extended Type Number

U2797B-AFS

U2797B-AFSG3

Package

SSO20

SSO20

Remarks

Rail, MOQ 830 pcs.

Tape & reel, MOQ 4000 pcs.

Rev. A1: 06.09.1995

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