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TELEFUNKEN Semiconductors
U2795B
2.5-GHz Double Balanced Mixer
Description
U2795B is a 2.5-GHz mixer for WLAN and RF telecom-
munications equipment, e.g., DECT and PCN, built with
TELEFUNKEN’s advanced bipolar technology. A
double balanced approach was chosen to assure good
isolation characteristics and a minimum of spurious
products. The input and output are single ended, and their
characteristics are programmable. No output transformer
or balun is required.
Features
D Supply voltage range: 2.7 to 5.5 V
D Single-ended output, no balun required
D Single-ended input for RF and LO
D Exellent isolation characteristics
D Power down mode
D IP3 and compression point programmable
D 2.5-GHz operating frequency
D SO-8 package
Benefits
D Reduced system costs due to few external component
(no balun) requirements
D Standard independent product
D 3-V operation reduces the battery count and saves
space
Block Diagram
2
RFi
3
P
R1
VH
VS
R2
VR
VH Voltage
regulator
IFo
5
So
4
PD
8
LOi 7
GND 6 VS 1
93 7811 e
Rev. A2: 08.06.1995
1 (13)

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U2795B
Pin Description
VS 1
RFI 2
P3
SO 4
8 PD
7 LOi
6 GND
5 IFO
94 7890 e
TELEFUNKEN Semiconductors
Pin Symbol
Function
1 VS Supply voltage
2 RFi RF input
3 P Progamming port IP3, CP
4 SO Output symmetry
5 IFO IF output
6 GND Ground
7 LOi LO input
8 PD Power down
Functional Description
Supply Voltage
The IC is designed for a supply voltage of 2.7 to 5.5 V. As
the IC is internally stabilized, the performance of the
circuit is nearly independent of the supply voltage.
Input Impedance
WInput impedance, ZRFi, is about 700 with an additional
capacitive component. This condition provides the best
noise figure in combination with a matching network.
3. Order Intercept Point (IP3)
Voltage divider, RP / R1, determinates both the input and
output intercept point, IIP3 and OIP3. If RP is infinity the
IIP3 has the maximum of about – 4 dBm.
Current Consumption, IS
Depending on the chosen input and output conditions of
the IC, the current consumption, IS, is between 4 mA and
10 mA. The current consumption in dependence of Rp is
shown in figure 4.
Power Down
This feature provides an extension of battery life. If this
function is not used, Pin 8 has to be connected to VS
(Pin 1).
Output Symmetry
The symmetry of the load current can be matched and so
be optimized for a given load impedance.
The IP3/RP characteristics are shown in figure 1 and 2.
Output Impedance and Intercept Point
Output impedance is shown in figure 9.
Both low output impedance and a high intercept point are
with reference to a high value of RP.
2 (13)
Rev. A2: 08.06.1995

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TELEFUNKEN Semiconductors
Absolute Maximum Ratings
Parameters
Supply voltage
Pin 1
Input voltage
Pins 2, 3, 7 and 8
Junction temperature
Storage temperature range
Thermal Resistance
Junction ambient
Parameters
SO 8
Operating Range
Parameters
Supply voltage range
Pin 1
Ambient temperature range
Symbol
VS
VI
Tj
Tstg
Symbol
Rthja
Symbol
VS
Tamb
U2795B
Value
6
0 to VS
125
– 40 to + 125
Unit
V
V
°C
°C
Value
175
Unit
K/W
Value
2.7 to 5.5
– 40 to + 85
Unit
V
°C
Rev. A2: 08.06.1995
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U2795B
TELEFUNKEN Semiconductors
Electrical Characteristics
R W ° WVS = 3 V, fLOi = 1 GHz, IF = 900 MHz, RF = 100 MHz, RP = , system impedance Zo = 50 , Tamb = 25 C, RT = 56
reference point Pin 6, unless otherwise specified
Parameters
Test Conditions / Pin
Supply voltage range
Pin 1
Typical supply current
range 1
Pin 1
Maximum supply current
Conversion power gain
Operating frequencies
RPin 1
WRL = 50 , RT =
W WRL = 50 , RT = 56
RFi frequency
LOi frequency
IFo frequency
Isolation
Pin 2
Pin 7
Pin 5
LO spurious at RFi
RFi to LOi
LO spurious at IFo
IFo to LOi
Output (IF)
Pin 7 to 2
PiLO = –10 to 0 dBm
Pin 2 to 7
PiRF = –25 dBm
Pin 7 to 5,
PiLO = – 10 to 0 dBm
Pin 5 to 7
Output compression point Pin 5
Input (RF)
Input impedance
Pin 2
Input compression point Pin 2
Third order input
Pin 2
intercept point
Input (LO)
LO level
Pin 7
Voltage standing wave ratio (VSWR)
Input LO
Pin 7
Output IF
Pin 4
Noise performance
Noise figure
Power down mode
RPiLO = 0 dBm, RT =
Supply current
Power down voltage
Pin 1 VPD < 0.5 V
Pin 1 VPD = 0 V
“Power ON”
“Power DOWN”
Pin 8 VS = 3.5 to 5.5 V
VS = 2.7 to 3.5 V
Pin 8
Power down current
Pin 8 Power ON
Power DOWN
Settling time
Pin 8 to 5
Note 1:
Depending on RP
Symbol Min. Typ. Max.
VS 2.7
IS 4
5.5
11
IS 13
PGC 9
PGC 4
RFi 10
fLOi 50
fIFo 50
2500
2500
2500
ISLO-RF
ISRF-LO
ISLO-IF
ISIF-LO
CPo
ZRFi
CPi
IIP3
– 30
35
– 25
30
– 10
W700 k0.8pF
– 14
–4
PiLO
VSWRLOi
VSWRIFo
NF
ISPD
VPON
VPDN
IPON
IPDN
tsPD
VS – 0.5
VS
–6
<2
<2
10
<5
0.15
<5
< 30
30
VS + 0.5
VS + 0.5
1
Unit
V
mA
mA
dB
dB
MHz
MHz
MHz
dBm
dB
dBm
dB
dBm
W
dBm
dBm
dBm
dB
mA
V
V
V
mmAA
ms
4 (13)
Rev. A2: 08.06.1995

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TELEFUNKEN Semiconductors
U2795B
–4
–5
–6
–7
–8
–9
–10
0 20 40 60 80 100
94 9235
Rp ( kW )
Figure 1. IIP3 versus resistor Rp, IF: 900 MHz
0
–5
–10
–15
–20
–25
0 20 40 60 80 100
94 9236
Rp ( kW )
Figure 2. OIP3 versus resistor Rp, IF: 900 MHz
3
–1
–5
–9
–13
0 20 40 60 80 100
94 9237
Rp ( kW )
Figure 3. Gain versus resistor Rp, LO: 1030 MHz,
Wlevel –10 dBm; RF: 130 MHz, –30 dBm, RT = 56
12
10
8
6
4
2
0
0 20 40 60 80 100
94 9238
Rp ( kW )
Figure 4. Supply current IS versus resistor Rp
Rev. A2: 08.06.1995
5 (13)