TELEFUNKEN Semiconductors
U2794B
1000 MHz Quadrature Demodulator
Description
U2794B silicon monolithic integrated circuit is a quadra-
ture demodulator that is manufactured using
TELEFUNKEN’s advanced UHF technology. This
demodulator features a frequency range from
70 – 1000 MHz, low current consumption, selectable
gain, power down mode and is adjustment free. The IC is
suitable for direct conversion and image rejection
applications in digital radio systems up to 1 GHz such as
cellular radio, cordless telephone, cable TV and satellite
TV systems.
Features
D
Supply voltage 5 V (typ.)
D
Very low power consumption 125 mW (typ.)
D
Very good image rejection by means of phase control
loop for precise 90° phase shifting
D
Low LO input level –10 dBm (typ.)
D
LO – frequency from 70 MHz to 1 GHz
D
Power down mode
D
25 dB gain control
D
Very low I/Q output dc offset voltage typ. < 5 mV
D
Duty cycle regeneration for single ended LO input
signal
Block Diagram
V
S
5,6
Power
down
PD
14
IIX
4
II
3
1 IX
OUTPUT
2 I
7
RFin
8
90°Control
loop
0°
90°
Frequency
doubler
Duty cycle
regenerator
15
17 LO
13 PC
12 PCX
Q
19
OUTPUT
20 QX
11
GC
16,18
GND
10
QQX
9
QQ
95 9778
Ordering Information
Extended Type Number
U2794B-AFS
U2794B-AFSG3
Package
SSO 20
SSO 20
Remarks
Rail, MOQ 830 pcs.
Tape and reel, MOQ 4000 pcs.
Rev. A3: 23.08.1995
1 (11)
TEMIC [ TEMIC SEMICONDUCTORS ]
