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U2794B датащи(PDF) 5 Page - ATMEL Corporation

номер детали U2794B
подробное описание детали  Very Low Power Consumption 125 mW
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

U2794B датащи(HTML) 5 Page - ATMEL Corporation

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5
U2794B
4653C–CELL–06/03
3.2
“Power DOWN”
14
V
POFF
1V
D
4
LO Input, LO
in
4.1
Frequency range
17
f
iLO
70
1000
MHz
D
4.2
Input level
(2)
17
P
iLO
-12
-10
-5
dBm
D
4.3
Input impedance
See Figure 12
17
Z
iLO
50
W
D
4.4
Voltage standing
wave ratio
See Figure 5
17
VSWR
LO
1.2
2
D
4.5
Duty-cycle range
17
DCR
LO
0.4
0.6
D
5
RF Input, RF
in
5.1
Noise figure (DSB)
symmetrical output
at 950 MHz
(3)
at 100 MHz
7, 8
NF
12
10
dB
D
5.2
Frequency range
f
iRF = FiLO ± BWYQ
7, 8
f
iRF
40
1030
MHz
D
5.3
-1 dB input
compression point
High gain
Low gain
7, 8
P
1dBHG
P
1dBLG
-8
+3.5
dBm
D
5.4
Second order IIP
(4)
7, 8
IIP
2HG
35
dBm
D
5.5
Third order IIP
High gain
Low gain
7, 8
IIP
3HG
IIP
3LG
+3
+13
dBm
D
5.6
LO leakage
Symmetric input
Asymmetric input
7, 8
L
OL
£ -60
£ -55
dBm
D
5.7
Input impedance
see Figure 12
7, 8
ZiRF
500II0.8
WIIpF
D
6
I/Q Outputs (I, IX, Q, QX) Emitter Follower I = 0.6 mA
6.1
3–dB bandwidth
w/o external C
1, 2, 19,
20
BWI/Q
³ 30
MHz
D
6.2
I/Q amplitude error
1, 2, 19,
20
Ae
-0.5
£ ±0.2
+0.5
dB
B
6.3
I/Q phase error
1, 2, 19,
20
Pe
-3
£ ±1.5
+3
Deg
B
Electrical Characteristics (Continued)
Test conditions (unless otherwise specified); VS = 5 V, Tamb = 25°C, referred to test circuit
System impedance ZO = 50 W, fiLO = 950 MHz, PiLO = -10 dBm
No.
Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes:
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.
2. The required LO-Level is a function of the LO frequency (see Figure 8).
3. Measured with input matching. For 950 MHz, the optional transmission line T3 at the RF input may be used for this pur-
pose. Noise figure measurements without using the differential output signal result in a worse noise figure.
4. Using Pins 7 and 8 as a symmetric RF input, the second-order IIP can be improved.
5. Due to test board parasitics, this bandwidth may be reduced and not be equal for I, IX, Q, QX. If symmetry and full band-
width is required, the lowpass Pins 3, 4 and 9, 10 should be isolated from the board. the bandwidth of the I/Q outputs can
be increased further by using a resistor between Pins 3, 4, 9 and 10. These resistors shunt the internal loads of
RI ~ 5.4 k
W. The decrease in gain here has to be considered.
6. The internal current of the output emitter followers is 0.6 mA. This reduces the undistorted output voltage swing at a 50
W
load to approsimately 30 mV. For low signal distortion the load impedance should be RI
³ 5 kW.
7. Referred to the level of the output vector
8. The low-gain status is achieved with an open or high-ohmic Pin 11. A recommended application circuit for switching
between high and low gain status is hown in Figure 3.
I
2
Q
2
+


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