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LT5520EUF#TRPBF

P1-P3P4-P6P7-P9P10-P12
LT5520
4
5520f
LO INPUT POWER (dBm)
GAIN (dB)
16
14
12
10
8
6
4
2
0
–2
–4
–16
–12
5520 • G06
–8
40–4
LO INPUT POWER (dBm)
–16
–12
–8
04
–4
LO INPUT POWER (dBm)
–16
–12
–8
04
–4
IF INPUT POWER (dBm/TONE)
–16
–12
–8
04
–4
IF INPUT POWER (dBm/TONE)
–16
–12
–8
04
–4
IIP3, IIP2 (dBm)
50
45
40
35
30
25
20
15
10
5
0
5520 • G07
LO INPUT POWER (dBm)
–16
–12
–8
04
–4
LO LEAKAGE (dBm)
–10
–20
–30
–40
–50
–60
5520 • G08
IIP3, IIP2 (dBm)
50
45
40
35
30
25
20
15
10
5
0
8
7
6
5
4
3
2
1
0
–1
–2
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
5520 • G09
P
OUT
, IM3 (dBm/TONE)
5520 • G10
P
OUT
, IM2 (dBm/TONE)
5520 • G11
GAIN (dB)
4.0 4.25 4.5 5.04.75
5.25
5.5
5520 • G12
4
3
2
1
0
–1
–2
–3
–4
–5
–6
SUPPLY VOLTAGE (V)
GAIN (dB)
5520 • G14
5520 • G13
IM2
T
A
= –40°C
HIGH SIDE LO
HIGH SIDE LO
LOW SIDE LO
LOW SIDE LO
HIGH SIDE LO
HIGH SIDE LO
LOW SIDE LO
LOW SIDE AND HIGH SIDE LO
LOW SIDE LO
SSB NF
GAIN
GAIN
T
A
= 85°C
T
A
= 85°C
T
A
= –40°C
T
A
= –40°C
IIP2
IIP3
T
A
= –40°C
T
A
= 85°C
T
A
= –40°C
T
A
= 85°C
T
A
= –40°C
T
A
= –40°C
T
A
= 85°C
T
A
= 85°C
T
A
= 85°C
T
A
= 25°C
P
OUT
IM3
P
OUT
FREQUENCY (MHz)
0
RETURN LOSS (dB)
0
–5
–10
–15
–20
–25
500
1000 1500 2000
2500 3000
IF PORT
RF PORT
LO PORT
20
18
16
14
12
10
8
6
4
2
0
NF (dB)
50
45
40
35
30
25
20
15
10
5
0
IIP3, IIP2 (dBm)
T
A
= 25°C
T
A
= 25°C
T
A
= 85°C
IIP2
IIP3
T
A
= 25°C, T
A
= –40°C
T
A
= 85°C
T
A
= 25°C
T
A
= 85°C
T
A
= 25°C
T
A
= 25°C
T
A
= 25°C
T
A
= 25°C
T
A
= –40°C
10
0
–10
–20
–30
–40
–50
–60
–70
–80
IF INPUT POWER (dBm)
–16
–12
–8
04
–4
T
A
= –40°C
IIP2
IIP3
Conversion Gain and SSB Noise
Figure vs LO Input Power
IIP3 and IIP2 vs
LO Input Power
LO-RF Leakage
vs LO Input Power
IIP3 and IIP2 vs
LO Input Power
RF Output Power and Output IM3 vs
IF Input Power (Two Input Tones)
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Conversion Gain vs IF Input
Power (One Input Tone)
Conversion Gain, IIP3 and IIP2
vs Supply Voltage
V
CC
= 5V
DC
, EN = High , T
A
= 25°C, IF input = 140MHz at –10dBm, LO input = 1.76GHz at –5dBm, RF output measured at 1900MHz,
unless otherwise noted. For 2-tone inputs: 2nd IF Input = 141MHz at –10dBm. (Test Circuit Shown in Figure 2.)
IF, LO and RF Port Return Loss
vs Frequency
RF Output Power and Output IM2 vs
IF Input Power (Two Input Tones)
LT5520
5
5520f
UU
U
PI FU CTIO S
GND (Pins 1, 4, 9, 12, 13, 16): Internal Grounds. These
pins are used to improve isolation and are not intended as
DC or RF grounds for the IC. Connect these pins to low
impedance grounds for best performance.
IF
+
, IF
–
(Pins 2, 3): Differential IF Signal Inputs. A differ-
ential signal must be applied to these pins through DC
blocking capacitors. The pins must be connected to ground
with 100Ω resistors (the grounds must each be capable of
sinking about 18mA). For best LO leakage performance,
these pins should be DC isolated from each other. An
impedance transformation is required to match the IF
input to the desired source impedance (typically 50Ω or
75Ω).
EN (Pin 5): Enable Pin. When the applied voltage is greater
than 3V, the IC is enabled. When the applied voltage is less
than 0.5V, the IC is disabled and the DC current drops to
about 1µA.
V
CC1
(Pin 6): Power Supply Pin for the Bias Circuits.
Typical current consumption is about 2mA. This pin
should be externally connected to V
CC
and have appropri-
ate RF bypass capacitors.
V
CC2
(Pin 7): Power Supply Pin for the LO Buffer Circuits.
Typical current consumption is about 22mA. This pin
should have appropriate RF bypass capacitors as shown
in Figure 2. The 1000pF capacitor should be located as
close to the pins as possible.
V
CC3
(Pin 8): Power Supply Pin for the Internal Mixer.
Typical current consumption is about 36mA. This pin
should be externally connected to V
CC
through an induc-
tor. A 39nH inductor is used in Figure 2, though the value
is not critical.
RF
–
, RF
+
(Pins 10, 11): Differential RF Outputs. One pin
may be DC connected to a low impedance ground to realize
a 50Ω single-ended output. No external matching compo-
nents are required. A DC voltage should not be applied
across these pins, as they are internally connected through
a transformer winding.
LO
+
, LO
–
(Pins 14, 15): Differential Local Oscillator In-
puts. The LT5520 works well with a single-ended source
driving the LO
+
pin and the LO
–
pin connected to a low
impedance ground. No external matching components are
required. An internal resistor is connected across these
pins; therefore, a DC voltage should not be applied across
the inputs.
GROUND (Pin 17, Exposed Pad): DC and RF ground
return for the entire IC. This must be soldered to the
printed circuit board low impedance ground plane.
BLOCK DIAGRA
W
IF
+
IF
–
LO
–
LO
+
RF
+
RF
–
BIAS
EN
V
CC1
V
CC2
V
CC3
5520 BD
15
16
13
8
6
5
17 12 11 10 9
7 1 2 3 4
14
GND
GND
GND
GND GND
GND
DOUBLE-
BALANCED
MIXER
HIGH SPEED
LO BUFFER
BACKSIDE
GROUND
10pF
5pF
5pF
85Ω
LT5520
6
5520f
TEST CIRCUIT
Figure 2. Test Schematic for the LT5520
REF DES VALUE SIZE PART NUMBER
C1, C2 220pF 0402 AVX 04023C221KAT2A
C3 15pF 0402 AVX 04023A150KAT2A
C4 1000pF 0402 AVX 04023A102KAT2A
C5 1µF 0603 Taiyo Yuden LMK107BJ105MA
L1 39nH 0402 Toko LL1005-FH39NJ
R1, R2 100Ω, 0.1% 0603 IRC PFC-W0603R-03-10R1-B
T1 4:1 SM-22 M/A-COM ETC4-1-2
APPLICATIO S I FOR ATIO
WUU
U
The LT5520 consists of a double-balanced mixer, a high-
performance LO buffer, and bias/enable circuits. The RF
and LO ports may be driven differentially; however, they
are intended to be used in single-ended mode by connect-
ing one input of each pair to ground. The IF input ports
must be DC-isolated from the source and driven differen-
tially. The IF input should be impedance-matched for the
desired input frequency. The LO input has an internal
broadband 50Ω match with return loss better than 10dB
at frequencies up to 3000MHz. The RF output band ranges
from 1300MHz to 2300MHz, with an internal RF trans-
former providing a 50Ω impedance match across the
band. Low side or high side LO injection can be used.
IF Input Port
The IF inputs are connected to the emitters of the double-
balanced mixer transistors, as shown in Figure 3. These
pins are internally biased and an external resistor must be
connected from each IF pin to ground to set the current
through the mixer core. The circuit has been optimized to
work with 100Ω resistors, which will result in approxi-
mately 18mA of DC current per side. For best LO leakage
performance, the resistors should be well matched; thus
resistors with 0.1%, tolerance are recommended. If LO
leakage is not a concern, then lesser tolerance resistors
can be used. The symmetry of the layout is also important
for achieving optimum LO isolation.
The capacitors shown in Figure 3, C1 and C2, serve two
purposes. They provide DC isolation between the IF
+
and
IF
–
ports, thus preventing DC interactions that could
cause unpredictable variations in LO leakage. They also
improve the impedance match by canceling excess induc-
tance in the package and transformer. The input capacitor
value required to realize an impedance match at desired
frequency, f, can be estimated as follows:
CC
fL L
IN EXT
12
2
1
2
==
π+()( )
where; f is in units of Hz, L
IN
and L
EXT
are in H, and C1, C2
are in farad. L
IN
is the differential input inductance of the
LT5520, and is approximately 1.67nH. L
EXT
represents the
combined inductances of differential external compo-
nents and transmission lines. For the evaluation board
shown in Figure 10, L
EXT
= 4.21nH. Thus, for f = 140MHz,
the above formula gives C1 = C2 = 220pF.
R2
R1
C1
C2
C3
EN
EN
C4C5
V
CC
RF
OUT
1900MHz
LO
IN
1760MHz
IF
IN
140MHz
IF
+
IF
–
LO
–
LO
+
RF
+
RF
–
V
CC1
V
CC2
V
CC3
GND
GND
GND
GND
GND
GND
LT5520
T1
16 15 14 13
12
11
10
9
8765
3
2
1
4
5
4
3
2
1
5520 TC01
ER = 4.4
RF
GND
DC
GND
0.018"
0.018"
0.062"
L1
P1-P3P4-P6P7-P9P10-P12

LT5520EUF#TRPBF

Mfr. #:
Buy LT5520EUF#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
RF Mixer 1.3GHz to 2.3GHz Upconverting Mixer
Lifecycle:
New from this manufacturer.
Delivery:
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