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TEMIC Semiconductors
TEMIC Semiconductors

U2794B-AFS Datasheet Preview

U2794B-AFS Datasheet

1000 MHz Quadrature Demodulator

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U2794B-AFS pdf
TELEFUNKEN Semiconductors
1000 MHz Quadrature Demodulator
U2794B
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 Duty cycle regeneration for single ended LO input
signal
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
Block Diagram
VS PD
5,6 14
Power
down
7
RFin
8
11
GC
90°Control
loop
16,18
GND
IIX II
43
1 IX
OUTPUT
2I
0°
90°
Frequency
doubler
10
QQX
9
QQ
Duty cycle
regenerator
15
17 LO
13 PC
12 PCX
Q
19 OUTPUT
20 QX
95 9778
Ordering Information
Extended Type Number
U2794B-AFS
U2794B-AFSG3
Rev. A3: 23.08.1995
Package
SSO 20
SSO 20
Remarks
Rail, MOQ 830 pcs.
Tape and reel, MOQ 4000 pcs.
1 (11)




TEMIC Semiconductors
TEMIC Semiconductors

U2794B-AFS Datasheet Preview

U2794B-AFS Datasheet

1000 MHz Quadrature Demodulator

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U2794B-AFS pdf
U2794B
Pin Description
IX 1
I2
II 3
IIX 4
VS 5
VS 6
RFin 7
RFXin 8
QQ 9
QQX 10
20 QX
19 Q
18 GND
17 LOin
16 GND
15 LOXin
14 PD
13 PC
12 PCX
11 GC
95 10711
TELEFUNKEN Semiconductors
Pin Symbol
Function
1 IX IX output
2 I I output
3 II II low pass filter I
4 IIX IIX low pass filter I
5 VS Supply voltage
6 VS Supply voltage
7 RFin RF input
8 RFXin RFX input
9 QQ QQ low pass filter Q
10 QQX QQX low pass filter Q
11 GC GC gain control
12 PCX PCX phase control
13 PC PC phase control
14 PD PD power down
15 LOXin LOX input
16 GND Ground
17 LOin LO input
18 GND Ground
19 Q Q output
20 QX QX output
Electrostatic sensitive device, observe precautions for handling!
Absolute Maximum Ratings
Parameters
Supply voltage
Pins 5 and 6
Input voltage
Pins 7, 8 and 17
Junction temperature
Storage temperature range
Operating Range
Parameters
Supply voltage range
Pins 5 and 6
Ambient temperature range
Thermal Resistance
Junction ambient
Parameters
SSO 20
Symbol
VS
Vi
Tj
Tstg
Symbol
VS
Tamb
Symbol
RthJA
Value
6
0 to VS
125
–40 to 125
Value
4.75 to 5.25
–40 to 85
Value
140
Unit
V
V
°C
°C
Unit
V
°C
Unit
K/W
2 (11)
Rev. A3: 23.08.1995




TEMIC Semiconductors
TEMIC Semiconductors

U2794B-AFS Datasheet Preview

U2794B-AFS Datasheet

1000 MHz Quadrature Demodulator

No Preview Available !

U2794B-AFS pdf
TELEFUNKEN Semiconductors
U2794B
Electrical Characteristics
WTest conditions (unless otherwise specified); VS = 5 V, Tamb = 25°C, referred to test circuit
System impedance ZO = 50 , fiLO = 950 MHz, PiLO = –10 dBm
Parameters
Test Conditions / Pins
Symbol Min.
Typ.
Supply voltage range
Pins 5 and 6
VS 4.75
Supply current
Pins 5 and 6
IS
30
Power down mode, PD
“OFF”mode supply
current
VPD 0.5 V
VPD = 1.0 V
Note 1
Pins 5 and 6
Pin 14
IsPD
1
20
Switch voltage
Pin 14
“Power ON”
VPON
4
“Power DOWN”
VPOFF
LO input, LOin
Frequency range
Pin 17
fiLO
70
Input level
Note 2
PiLO –12 –10
Input impedance
See figure 6
ZiLO
50
Voltage standing wave See figure 2
ratio
VSWRLO
1.2
Duty cycle range
LODCR
0.4
RF input, RFin
Noise figure (DSB)
symmetrical output
@ 950 MHz Note 3
@ 100 MHz Pins 7 and 8
NF
12
10
Max.
5.25
1
1000
–5
2
0.6
Unit
V
mA
mA
V
V
MHz
dBm
W
dB
Frequency range
–1 dB input
compression point
Second order IIP
Third order IIP
LO leakage
Input impedance
Pins 7 and 8
High gain
Low gain
Pins 7 and 8
Note 4
Pins 7 and 8
High gain
Low gain
Pins 7 and 8
Pins 7 and 8
Symmetric input
Asymmetric input
Pins 7 and 8
see figure 6
fiRF
ICPHG
ICPLG
IIP2HG
IIP3HG
IIP3LG
LOL
ZiRF
>fiLO
–8
+3.5
35
+3
+13
–60
–55
500Wø
0.8pF
dBm
dBm
dBm
dBm
Note 1: During power down status a load circuitry with dc-isolation to GND is assumed otherwise a current of
I (VS –0.8 V) /RI has to be added to the above power down current for each output I, IX, Q, QX.
Note 2: The required LO-Level is a function of the LO-frequency (see figure 3).
Note 3: Measured with input matching. For 950 MHz the optional transmission line T3 at the RF input may be used
for this purpose. Noise figure measurements without using the differential output signal result in a worse noise
figure.
Note 4: Using Pins 7 and 8 as a symmetric RF input, the second order IIP can be improved.
Rev. A3: 23.08.1995
3 (11)




Part Number U2794B-AFS
Description 1000 MHz Quadrature Demodulator
Maker TEMIC Semiconductors
Total Page 11 Pages
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