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U2797B-AFSG3 Datasheet

  • U2797B-AFSG3

  • 1000-MHz Quadrature Modulator

  • 13頁

  • TEMIC

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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擄 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
擄
90
擄
90
擄
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
1 (13)

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