U2797B Datasheet, PDF (1/13 Pages) TEMIC Semiconductors – 1000-MHz Quadrature Modulator

TELEFUNKEN Semiconductors
U2797B
1000-MHz Quadrature Modulator
Description
The IC U2797B is a 1000-MHz quadrature modulator that
uses TELEFUNKEN’s 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.
W The I/Q input impedance is about 150 k . 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
–1 dBm output level)
W D 150 k I/Q input impedance
D Excellent sideband suppression by means of duty
cycle regeneration of the LO input signal
D Phase control loop for precise 90° phase shifting
D Power down mode
D Low LO input level: –10 dBm (typical)
W D 50- 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 Adjustment-free hence saves time
Block Diagram
10
BB_Ai
BB_Ai
9
S_PD PD
8 1 _5,6
Power 7
V_S
down
13 ^VRef
LO_i ¹⁴ Duty cycle
regenerator
Phase adj.
19
20
BB_{Bi 11}
BB_{Bi 12}
94 8185 e
Frequency
doubler
0°
90°
90° control
loop
4 ^RFo
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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