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PDF U2795B Data sheet ( Hoja de datos )
| Número de pieza | U2795B | |
| Descripción | 2.5-GHz Double balanced Mixer | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• Supply-voltage Range: 2.7 V to 5.5 V
• Single-ended Output, no Balun Required
• Single-ended Input for RF and LO
• Excellent Isolation Characteristics
• Power-down Mode
• IP3 and Compression Point Programmable
• 2.5-GHz Operating Frequency
Benefits
• Reduced System Costs as only Few External Component (no Balun) are Required
• Small Package
• Very Low Current Consumption
• Easy to Use
Electrostatic sensitive device.
Observe precautions for handling.
Description
The U2795B is a 2.5-GHz mixer for WLAN and RF telecommunications equipment,
e.g., DECT and PCN. The IC is manufactured using Atmel's advanced bipolar technol-
ogy. 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.
Figure 1. Block Diagram
2
RFi
VS
R2
5 IFo
3
P
R1
VH
4 So
VR
VH Voltage
regulator
8 PD
2.5-GHz
Double-
balanced
Mixer
U2795B
7
LO i
61
GND
VS
Rev. 4654A–CELL–01/03
1
1 page  
Figure 3. IIP3 versus Resistor Rp, IF: 900 MHz
-4
-5
-6
-7
-8
-9
-10
0 20 40 60 80 100
Rp (kW)
Figure 4. OIP3 versus Resistor Rp, IF: 900 MHz
0
-5
-10
-15
-20
-25
0 20 40 60 80 100
Rp (kW)
U2795B
4654A–CELL–01/03
5
5 Page 
Application
U2795B
VS
RT
RF
C1
C2
Rp
C6
C3 RSO
RI
1
2
3
4
C7
8
C5
7
6
C4
5
PU
LO
IF
Table 1. Part List
Part
C1
C2, C3, C4, C5, C6, C7
*RP
*RSO
———
RT
Value
10 nF
100 pF
50-W Microstrip
68 W
optional
56 W
If the part-list values are used, the PU settling time is < 20 µs. Using other values, time
requirements in burst-mode applications have to be considered.
The values of RSO and RP depend on the input and output condition requirements. For
RSO, 68 W is recommended.
By means of the optional RI, the intercept and compression point can be slightly
increased; values between 500 W and 1 kW are suitable. Please note that such modifi-
cation will also increase the supply current.
4654A–CELL–01/03
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet U2795B.PDF ] | |
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