FeaTures
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LTC5548
2GHz to 14GHz
Microwave Mixer with
Wideband DC– 6GHz IF
DescripTion
The
LTC
®
5548
is a high performance, microwave double
balanced passive mixer that can be used for frequency
upconversion or downconversion. The device is similar
to the LTC5549, but with a broadband, differential DC to
6GHz IF port. The LTC5548 is recommended for applica-
tions where the IF frequency range extends below 500MHz.
For applications where the IF frequency is always above
500MHz, the LTC5549 is recommended, since it includes
an integrated IF balun.
The LTC5548’s mixer and integrated RF balun are opti-
mized to cover the 2GHz to 14GHz RF frequency range.
The device includes an integrated LO amplifier optimized
for the 1GHz to 12GHz frequency range, requiring only
0dBm drive. The device also includes an integrated LO
frequency doubler, which can be enabled or disabled with
a CMOS-compatible control pin.
The LTC5548 delivers exceptionally high IIP3 and P1dB,
in addition to very low LO to RF and LO to IF leakages.
The part also offers high integration in a small package.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
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Upconversion or Downconversion
High IIP3: +24.4dBm at 5.8GHz
+21.4dBm at 9GHz
7.1dB Conversion Loss at 5.8GHz
+15.2dBm Input P1dB at 5.8GHz
Integrated LO Buffer: 0dBm LO Drive
Selectable Integrated LO Frequency Doubler
Low LO-RF Leakage: <–30dBm
50Ω Wideband Matched RF and LO Ports
3.3V/120mA Supply
Fast Turn ON/OFF for TDD Operation
3mm × 2mm, 12-Lead QFN Package
applicaTions
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Microwave Transceivers
Wireless Backhaul
Point-to-Point Microwave
Phased-Array Antennas
C, X and Ku Band RADAR
Test Equipment
Satellite MODEMs
Typical applicaTion
LTC5548
LNA
RF
LO
R
X
LO
T
X
LO
LO
PA
RF
IF
T
X
IF
IN
IF
Conversion Loss and IIP3
(Low Side LO, IF = 240MHz)
CONVERSION LOSS (dB), IIP3 (dBm)
R
X
IF
OUT
30
28
26
24
22
20
18
16
14
12
10
8
6
CONVERSION LOSS
DOWNMIXING
UPMIXING
IIP3
DUPLEXER
LTC5548
5548 TA01a
2
3
4
5
6
7
8
9
10 11 12
5548 TA01b
RF FREQUENCY (GHz)
For more information
www.linear.com/LTC5548
1
5548f
LTC5548
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
TOP VIEW
GND
GND
10
9
13
GND
4
GND
5
RF
6
GND
8
7
V
CC
X2
EN
LO
11
Supply Voltage (V
CC
) ..................................................4V
Enable Input Voltage (EN) ................–0.3V to V
CC
+ 0.3V
X2 Input Voltage (X2) ......................–0.3V to V
CC
+ 0.3V
LO Input Power (1GHz to 12GHz) .................. ….+10dBm
LO Input DC Voltage ............................................ ±0.1V
RF Power (2GHz to 14GHz) ................................+20dBm
RF DC Voltage ....................................................... ±0.1V
IF
+
/IF
–
Input Power (LF to 6GHz) .......................+20dBm
IF
+
/IF
–
Input DC Voltage .........................................±0.3V
Operating Temperature Range (T
C
) ........ –40°C to 105°C
Storage Temperature Range .................. –65°C to 150°C
Junction Temperature (T
J
) .................................... 150°C
12
GND
IF
+
IF
–
1
2
3
UDB PACKAGE
12-LEAD (3mm × 2mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JC
= 25°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
Lead Free Finish
TAPE AND REEL (MINI)
TAPE AND REEL
(http://www.linear.com/product/LTC5548#orderinfo)
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC5548IUDB#TRMPBF
LTC5548IUDB#TRPBF
LGXF
12-Lead (3mm × 2mm) Plastic QFN
–40°C to 105°C
TRM = 500 pieces.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
Dc elecTrical characTerisTics
PARAMETER
Power Supply Requirements
Supply Voltage (V
CC
)
Supply Current Enabled
Shutdown Current
Input High Voltage (On)
Input Low Voltage (Off)
Input Current
Chip Turn-On Time
Chip Turn-Off Time
CONDITIONS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
C
= 25°C. V
CC
= 3.3V, EN = High, unless otherwise noted. Test circuit shown in
Figure 1. (Note 2)
MIN
l
TYP
3.3
120
136
MAX
3.6
140
160
100
UNITS
V
mA
mA
μA
V
3.0
X2 = Low (LO Doubler Off)
X2 = High (LO Doubler On)
EN = Low
l
l
Enable (EN) and LO Frequency Doubler (X2) Logic Inputs
1.2
0.3
–30
0.2
0.1
100
V
μA
μs
μs
–0.3V to V
CC
+ 0.3V
2
5548f
For more information
www.linear.com/LTC5548
LTC5548
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
C
= 25°C. V
CC
= 3.3V, EN = High, P
LO
= 0dBm, P
RF
= –5dBm (–5dBm/tone for two-
tone IIP3 tests), unless otherwise noted. Test circuit shown in Figure 1. (Notes 2, 3)
PARAMETER
LO Frequency Range
RF Frequency Range
IF Frequency Range
RF Return Loss
LO Input Return Loss
LO Input Power
Z
O
= 50Ω, 2GHz to 13.6GHz
Z
O
= 50Ω, 1GHz to 12GHz
X2 = Low
X2 = High
RF Input = 2GHz
RF Input = 5.8GHz
RF Input = 9GHz
RF Input = 12GHz
T
C
= –40°C to 105°C, RF Input = 5.8GHz
RF Input = 2GHz
RF Input = 5.8GHz
RF Input = 9GHz
RF Input = 12GHz
RF Input = 2GHz
RF Input = 5.8GHz
RF Input = 8.5GHz
f
LO
= 1GHz to 12GHz
f
LO
= 1GHz to 12GHz
f
RF
= 2GHz to 14GHz
f
RF
= 2GHz to 14GHz
RF Input = 5.8GHz
RF Input = 5.8GHz
RF Input = 9GHz
RF Input = 12GHz
T
C
= –40°C to 105°C, RF Input = 5.8GHz
RF Input = 5.8GHz
RF Input = 9GHz
RF Input = 12GHz
RF Input = 5.8GHz
RF Input = 8.5GHz
f
LO
= 1GHz to 5GHz
f
LO
= 1GHz to 5GHz
f
LO
= 1GHz to 5GHz
f
LO
= 1GHz to 5GHz
f
RF
= 5.8GHz
l
l
ac elecTrical characTerisTics
CONDITIONS
MIN
l
l
l
TYP
1 to 12
2 to 14
DC to 6000
>9
>10
MAX
UNITS
GHz
GHz
MHz
dB
dB
–6
–6
0
0
6.0
7.1
8.5
10.2
0.006
23.1
24.4
21.4
18.7
6.2
8.0
9.6
<–25
<–26
>40
>35
15.2
7.3
9.2
11.8
0.006
23.9
20.9
18.3
8.9
10.8
<–30
≤–25
<–36
<–20
14.8
6
3
dBm
dBm
dB
dB
dB
dB
dB/°C
dBm
dBm
dBm
dBm
dB
dB
dB
dBm
dBm
dB
dB
dBm
dB
dB
dB
dB/°C
dBm
dBm
dBm
dB
dB
dBm
dBm
dBm
dBm
dBm
Downmixer Application with LO Doubler Off (X2 = Low), IF = 240MHz, Low Side LO
Conversion Loss
Conversion Loss vs Temperature
2-Tone Input 3rd Order Intercept
(Δf
RF
= 2MHz)
SSB Noise Figure
LO to RF Leakage
LO to IF Leakage
RF to LO Isolation
RF Input to IF Output Isolation
Input 1dB Compression
Conversion Loss
Downmixer Application with LO Doubler On (X2 = High), IF = 240MHz, Low Side LO
Conversion Loss vs. Temperature
2-Tone Input 3rd Order Intercept
(Δf
RF
= 2MHz)
SSB Noise Figure
LO to RF Input Leakage
2LO to RF Input Leakage
LO to IF Output Leakage
2LO to IF Output Leakage
Input 1dB Compression
For more information
www.linear.com/LTC5548
3
5548f
LTC5548
ac elecTrical characTerisTics
PARAMETER
Conversion Loss
CONDITIONS
RF Output = 2GHz
RF Output = 5.8GHz
RF Output = 9GHz
RF Output = 12GHz
T
C
= –40°C to 105°C, RF Output = 5.8GHz
RF Output = 2GHz
RF Output = 5.8GHz
RF Output = 9GHz
RF Output = 12GHz
RF Output = 2GHz
RF Output = 5.8GHz
RF Output = 8.5GHz
f
LO
= 1GHz to 12GHz
f
LO
= 1GHz to 12GHz
f
IF
= 500MHz to 6GHz
f
IF
= 500MHz to 6GHz
RF Output = 5.8GHz
RF Output = 5.8GHz
RF Output = 9GHz
RF Output = 12GHz
T
C
= –40°C to 105°C, RF Output = 5.8GHz
RF Output = 5.8GHz
RF Output = 9GHz
RF Output = 12GHz
RF Output = 5.8GHz
RF Output = 9GHz
f
LO
= 1GHz to 5GHz
f
LO
= 1GHz to 5GHz
f
LO
= 1GHz to 5GHz
f
LO
= 1GHz to 5GHz
RF Output = 5.8GHz
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
C
= 25°C. V
CC
= 3.3V, EN = High, P
LO
= 0dBm, P
IF
= –5dBm (–5dBm/tone for two-
tone IIP3 tests), unless otherwise noted. Test circuit shown in Figure 1. (Notes 2, 3)
MIN
TYP
6.3
7.1
9.3
10.9
0.006
26.3
24.9
21.5
17.2
7.8
8.7
10.4
<–25
<–26
>50
>40
15.7
7.4
9.6
12.1
0.006
24.9
21.3
16.8
10.4
12.4
<–30
<–25
<–36
<–20
14.8
MAX
UNITS
dB
dB
dB
dB
dB/°C
dBm
dBm
dBm
dBm
dB
dB
dB
dBm
dBm
dB
dB
dBm
dB
dB
dB
dB/°C
dBm
dBm
dBm
dB
dB
dBm
dBm
dBm
dBm
dBm
Upmixer Application with LO Doubler Off (X2 = Low), IF = 240MHz, Low Side LO
Conversion Loss vs Temperature
Input 3rd Order Intercept (Δf
IF
= 2MHz)
SSB Noise Figure
LO to RF Output Leakage
LO to IF Input Leakage
IF to LO Isolation
IF to RF Isolation
Input 1dB Compression
Conversion Loss
Upmixer Application with LO Doubler On (X2 = High), IF = 240MHz, Low Side LO
Conversion Loss vs Temperature
2-Tone Input 3rd Order Intercept
(Δf
IF
= 2MHz)
SSB Noise Figure
LO to RF Output Leakage
2LO to RF Output Leakage
LO to IF Input Leakage
2LO to IF Input Leakage
Input 1dB Compression
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LTC5548 is guaranteed functional over the –40°C to 105°C
case temperature range (θ
JC
= 25°C/W).
Note 3:
SSB noise figure measurements performed with a small-signal
noise source, bandpass filter and 2dB matching pad on input, with
bandpass filters on LO, and output.
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5548f
For more information
www.linear.com/LTC5548
LTC5548
Typical perForMance characTerisTics
Supply Current vs Case
Temperature
150
140
130
I
CC
(mA)
I
CC
(mA)
120
110
100
90
80
70
–40 –20
V
CC
= 3V
V
CC
= 3.3V
V
CC
= 3.6V
0
20
40
60
80
100 120
5548 G01
EN = high, test circuit shown in Figure 1.
Supply Current vs V
CC
150
140
130
120
110
100
90
80
70
3.0
3.1
3.2
3.3
3.4
T
C
= –40°C
T
C
= 25°C
T
C
= 85°C
T
C
= 105°C
3.5
3.6
5548 G02
X2 = HIGH
X2 = HIGH
X2 = LOW
X2 = LOW
CASE TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
For more information
www.linear.com/LTC5548
5
5548f
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