U2795B-CFP [ATMEL]
Double Balanced Mixer, 10MHz Min, 2500MHz Max, BIPolar, SO-8;
| 型号： | U2795B-CFP |
| 厂家： | 
ATMEL |
| 描述： | Double Balanced Mixer, 10MHz Min, 2500MHz Max, BIPolar, SO-8 射频和微波 射频混频器 微波混频器 局域网 |
| 文件： | 总14页 (文件大小：448K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
2.5-GHz
Double-
balanced
Mixer
• 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.
U2795B
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
V
S
2
R
2
IF
o
5
4
RF
i
3
S
o
P
V
R
1
R
V
H
V
PD
Voltage
regulator
8
H
7
6
1
LO
V
S
i
GND
Rev. 4654A–CELL–01/03
Pin Configuration
Figure 2. Pinning
1
2
3
4
8
7
6
5
PU
VS
LOi
RF
GND
P
SO
IFO
Pin Description
Pin
Symbol
Function
1
VS
Supply voltage
RF input
2
RFi
P
3
Progamming port IP3, CP
Output symmetry
IF output
4
SO
5
IFO
6
GND
LOi
PU
Ground
7
LO input
8
Power-up
2
U2795B
4654A–CELL–01/03
U2795B
Functional Description
Supply Voltage
The IC is designed for a supply-voltage range of 2.7 V to 5.5 V. As the IC is internally
stabilized, the performance of the circuit is nearly independent of the supply voltage.
Input Impedance
The input impedance, ZRFi, is about 700 ꢀ with an additional capacitive component. This
condition provides the best noise figure in combination with a matching network.
3rd Order Intercept Point The voltage divider, RP/R1, determinates both the input and output intercept point, IIP3
and OIP3. If the value of RP is infinite, the maximum value of IIP3 reachs about -4 dBm.
The IP3/RP characteristics are shown in Figure 3 and Figure 4.
(IP3)
Output Impedance and
Intercept Point
The output impedance is shown in Figure 11. Both low output impedance and a high
intercept point are defined to a high value of RP.
Current Consumption, IS Depending on the chosen input and output conditions of the IC, the current consump-
tion,IS, is between 4 mA and 10 mA. The current consumption in dependence of Rp is
shown in Figure 6.
Power-up
This feature provides extended battery lifetime. 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 thus optimized for a given load
impedance.
Absolute Maximum Ratings
Parameters
Symbol
Value
6
Unit
V
Supply voltage
VS
VI
Input voltage
0 to VS
125
V
Junction temperature
Storage-temperature range
Tj
LC
LC
Tstg
-40 to +125
Thermal Resistance
Parameters
Symbol
Value
Unit
Junction ambient SO8
RthJA
175
K/W
Operating Range
Parameters
Symbol
VS
Value
Unit
V
Supply-voltage range
Ambient-temperature range
2.7 to 5.5
-40 to +85
Tamb
LC
3
4654A–CELL–01/03
Electrical Characteristics
VS = 3 V, fLOi = 1 GHz, IF = 900 MHz, RF = 100 MHz, RP = A, system impedance Zo = 50 ꢀ, Tamb = 25LC, RT = 56 ꢀ
reference point Pin 6, unless otherwise specified
No. Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
1.1
1.2
Supply voltage range
1
VS
2.7
5.5
V
A
IS
IS
1
1
9
3
13
6.2
mA
mA
A
A
Supply Current
VS = 2.7 V
1.3
Conversion Supply
Current
RL = 50 ꢀ, RT = A
RL = 50 ꢀ, RT = 56 ꢀ
PGC
PGC
9
4
dB
dB
1
B
2
Operating Frequencies
RFi frequency
LOi frequency
IFo frequency
Isolation
2.1
2.2
2.3
3
2
7
5
RFi
fLOi
fIFo
10
50
50
2500
2500
2500
MHz
MHz
MHz
D
D
D
3.1
3.2
3.3
3.4
4
LO spurious at RFi
RFi to LOi
PiLO = -10 to 0 dBm
PiRF = -25 dBm
7, 2
2, 7
5, 7
5, 7
ISLO–RF
ISRF–LO
ISLO–IF
ISIF–LO
-30
35
dBm
dB
D
D
D
D
LO spurious at IFo
IFo to LOi
PiLO = -10 to 0 dBm
-25
30
dBm
dB
Output (IF)
4.1
Output compression
point
5
CPO
-10
dBm
D
5
Input (RF)
5.1
5.2
5.3
Input impedance
Input compression point
2
2
ZRFi
CPi
700ꢁꢁ0.8
ꢀꢁꢁpF
D
D
-14
dBm
3rd-order input
intercept point
2
IIP3
-4
dBm
D
6
6.1
7
Input (LO)
LO level
7
PiLO
-6
dBm
D
Voltage Standing Wave Ratio (VSWR)
Input LO
7.1
7.2
8
7
4
VSWRLOi
VSWRIFo
< 2
< 2
D
D
Output IF
Noise Performance
8.1
9
Noise figure
PiLO = 0 dBm, RT = A
NF
10
dB
D
Power-down Mode
Supply current
9.1
VPU < 0.5V
VPU = 0 V
30
µA
µA
B
B
1
ISPU
< 5
10
Power-down Voltage
10.1 “Power ON”
VS = 3.5 to 5.5 V
VS = 2.7 to 3.5 V
VS -0.5
VS
VS + 0.5
VS + 0.5
V
V
D
D
8
8
VPON
VPDN
10.2 “Power DOWN”
1
V
D
10.3 Power-down current
Power ON
Power DOWN
IPON
IPDN
0.15
< 5
mA
µA
A
D
8
0.22
10.4 Settling time
5,8
tsPD
< 30
µs
D
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
4
U2795B
4654A–CELL–01/03
U2795B
Figure 3. IIP3 versus Resistor Rp, IF: 900 MHz
-4
-5
-6
-7
-8
-9
-10
100
0
20
40
60
80
Rp (kꢀ)
Figure 4. OIP3 versus Resistor Rp, IF: 900 MHz
0
-5
-10
-15
-20
-25
100
0
20
40
60
80
Rp (kꢀ)
5
4654A–CELL–01/03
Figure 5. Gain versus Resistor Rp, LO: 1030 MHz, level -10 dBm; RF: 130 MHz,
-30 dBm, RT = 56 ꢀ
3
-1
-5
-9
-13
100
0
20
40
60
80
Rp (kꢀ)
Figure 6. Supply Current IS versus Resistor Rp
12
10
8
6
4
2
0
100
0
20
40
60
Rp (kꢀ)
80
6
U2795B
4654A–CELL–01/03
U2795B
Figure 7. Gain versus IF Output Frequency, LO Level: -6 dBm, RF: 130 MHz, -35 dBm;
Parameter: RF Input Termination
18
with RF input matching
LS = 220 nH, Cp = 4.7 pF
14
without RT
10
6
2
with RT = 56 ꢀ
-2
2500
0
500
1000
1500
2000
IF (MHz)
Figure 8. IIP3 versus IF Output Frequency, LO Level: -6 dBm; RF: 130 MHz/
130.1 MHz, -35 dBm; Parameter: RF Input Termination
0
-2
with RT = 56
ꢀ
-4
-6
without RT
-8
-10
-12
-14
with RF input matching
LS = 220 nH, Cp = 4.7 pF
-16
-18
0
500
1000
1500
2000
2500
IF (MHz)
7
4654A–CELL–01/03
Figure 9. Double Sideband Noise Figure versus IF Output Frequency; LO: 1000 MHz,
Level 0 dBm; no RF Input Matching, RT Left Out
12
10
8
6
4
2
0
0
200
400
IF (MHz)
600
800
Figure 10. Typical VSWR Frequency Response of the IF Output, RP = Aꢁ
5
4
3
2
1
1000
100
280
460
640
820
IF Frequency (MHz)
8
U2795B
4654A–CELL–01/03
U2795B
Figure 11. Typical Impedance of the Output versus RP at Frequency fIFo = 900 MHz
Markers (from Left to Right): RP = A/22 kꢀ/10 kꢀ/8.2 kꢀ/5.6 kꢀ
j
0.5j
2j
0.2j
5j
0
0.2
0.5
1
5
A
2
-0.2j
-5j
-0.5j
-2j
-j
Figure 12. Typical S11 Frequency Response of the IF Output, RP = A, IF Frequency
from 100 MHz to 1000 MHz, Marker: 900 MHz
j
0.5j
2j
0.2j
5j
A
0
0.2
0.5
1
2
5
-0.2j
-5j
-0.5j
-2j
-j
9
4654A–CELL–01/03
Figure 13. Typical S11 Frequency Response of the RF Intput, RP = A, RT = A
RF Frequency from 100 MHz to 1000 MHz, Marker: 900 MHz
j
0.5j
2j
0.2j
5j
A
0
0.2
0.5
1
2
5
-0.2j
-5j
-0.5j
-2j
-j
Figure 14. Typical S11 Frequency Response of the LO Intput, RP = A, LO Frequency
from 100 MHz to 1000 MHz, Marker: 900 MHz
j
0.5j
2j
0.2j
5j
A
0
0.2
0.5
1
2
5
-0.2j
-5j
-0.5j
-2j
-j
10
U2795B
4654A–CELL–01/03
U2795B
Application
C1
C2
C7
VS
8
7
6
5
1
2
3
4
PU
LO
RT
C5
C4
RF
Rp
C6
IF
RSO
C3
R
I
Table 1. Part List
Part
Value
10 nF
C 1
C2, C3, C4, C5, C6, C7
*RP
100 pF
50-ꢀ Microstrip
68 ꢀ
*RSO
— — —
RT
optional
56 ꢀ
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
R
SO, 68 ꢀ is recommended.
By means of the optional RI, the intercept and compression point can be slightly
increased; values between 500 ꢀ and 1 kꢀ are suitable. Please note that such modifi-
cation will also increase the supply current.
11
4654A–CELL–01/03
Application Circuit (Evaluation Board)
12
U2795B
4654A–CELL–01/03
U2795B
Ordering Information
Extended Type Number
Package
SO8
Remarks
U2795B-MFP
Tube
U2795B-MFPG3
SO8
Taped and reeled
Package Information
Package SO8
Dimensions in mm
5.2
4.8
5.00
3.7
4.85
1.4
0.25
0.2
0.4
3.8
0.10
1.27
6.15
5.85
3.81
8
5
technical drawings
according to DIN
specifications
1
4
13
4654A–CELL–01/03
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Printed on recycled paper.
4654A–CELL–01/03
xM
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