FeaTures
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LTC5551
300MHz to 3.5GHz
Ultra-High Dynamic Range
Downconverting Mixer
DescripTion
The
LTC
®
5551
is a 2.5V to 3.6V mixer optimized for RF
downconverting mixer applications that require very high
dynamic range.
The LTC5551 covers the 300MHz to
3.5GHz RF Frequency range with LO frequency range
of 200MHz to 3.5GHz.
The LTC5551 provides very high
IIP3 and P1dB with low power consumption. A typical
application is a basestation receiver covering 700MHz to
2.7GHz frequency range. The RF input can be matched for a
wide range of frequencies and the IF is usable up to 1GHz.
A low power mode is activated by pulling the ISEL pin high,
reducing the power consumption by about 1/3, however,
with a corresponding reduction in IIP3 to approximately
+29dBm. The mixer can also be turned on or off by using
the EN pin.
The LTC5551’s high level of integration minimizes the
total solution cost, board space and system level variation,
while providing the highest dynamic range for demanding
receiver applications.
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.
Protected by U.S. Patents, including 8558605.
+36dBm
Input IP3
2.4dB Conversion Gain
Low Noise Figure: <10dB
+18dBm
Ultra High Input P1dB
670mW Power Consumption
2.5V to 3.6V Operation
50Ω Single-Ended RF and LO Inputs
0dBm LO Drive Level
Low Power Mode
–40°C to 105°C Operation (T
C
)
Small Solution Size
Enable Pin
16-Lead (4mm
×
4mm) QFN Package
GSM, LTE, LTE-Advanced Basestations
Repeaters
DPD Observation Receiver
Public Safety Radios, Military and Defense
Avionics Radios and TCAS Transponders
Active Phased-Array Antennas
White-Space Radio Receiver
applicaTions
n
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Typical applicaTion
Wideband Receiver
1nF
V
CC
3.3V
470nH
475
IF
+
IF
RF
LO
470nH
475
IF
–
LTC5551
LO
3.9pF
LTC6946
SYNTH
LO
1700MHz
1nF
BPF
LTC6416
IF
AMP
LTC2208
ADC
39
36
33
30
IIP3 (dBm)
27
24
21
18
15
12
9
NORMAL POWER MODE
LOW POWER MODE
RF = 1770MHz TO 1970MHz
LO = 1700MHz
Z
IF
= 200
G
C
4
3
2
1
70 90 110 130 150 170 190 210 230 250 270
IF FREQUENCY (MHz)
5551 TA01b
5551 TA01a
Mixer Conversion Gain and IIP3
vs IF Frequency (Low-Side LO)
6
IIP3
5
0.56µF
22pF
G
C
(dB)
2.2pF
RF
IN
7.5nH
EN
(0V/3.3V)
V
CC
3.3V
EN
BIAS
V
CC
0.56µF
22pF
5551fa
For more information
www.linear.com/LTC5551
1
LTC5551
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
TOP VIEW
IFBIAS
GND
12 TEMP
17
GND
11 GND
10 LO
9
5
EN
6
V
CC
7
V
CC
8
ISEL
GND
IF
+
IF
–
Supply Voltage (V
CC
, IF
+
, IF
–
) .....................................4V
Enable Input Voltage (EN) ................–0.3V to V
CC
+ 0.3V
Power Select Voltage (ISEL) ............–0.3V to V
CC
+ 0.3V
LO Input Power (0.2GHz to 3.5GHz) ................... +10dBm
LO Input DC Voltage ............................................ ±0.1V
RF Input Power (0.3GHz to 3.5GHz) ...................+20dBm
RF Input DC Voltage ............................................... ±0.1V
TEMP Diode Continuous DC Input Current.............10mA
TEMP Diode Input Voltage ........................................ ±1V
IFBIAS Voltage .........................................................2.5V
Operating Temperature Range (T
C
) ........ –40°C to 105°C
Storage Temperature Range .................. –65°C to 150°C
Junction Temperature (T
J
) .................................... 150°C
CAUTION:
This part is sensitive to electrostatic discharge
(ESD). It is very important that proper ESD precautions
be observed when handling the LTC5551.
16 15 14 13
TP 1
RF 2
CT 3
GND 4
UF PACKAGE
16-LEAD (4mm
×
4mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JC
= 6°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LTC5551IUF#PBF
TAPE AND REEL
LTC5551IUF#TRPBF
PART MARKING
5551
PACKAGE DESCRIPTION
16-Lead (4mm
×
4mm) Plastic QFN
CASE TEMPERATURE RANGE
–40°C to 105°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
2
5551fa
For more information
www.linear.com/LTC5551
LTC5551
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, ISEL = Low, P
LO
= 0dBm, unless otherwise
noted. Test circuit shown in Figure 1. (Notes 2, 3)
PARAMETER
LO Input Frequency Range
RF Input Frequency Range
IF Output Frequency Range
RF Input Return Loss
LO Input Return Loss
IF Output Impedance
LO Input Power
LO to RF Leakage
LO to IF Leakage
RF to LO Isolation
RF to IF Isolation
Requires External Matching
Z
O
= 50Ω, 1100MHz to 2700MHz, X1 = 7.5nH, C1 = 2.2pF
Z
O
= 50Ω, 1000MHz to 3500MHz, C2 = 3.9pF
Differential at 153MHz
LO = 200MHz to 3500MHz
LO = 200MHz to 3500MHz
LO = 200MHz to 3500MHz
RF = 300MHz to 3500MHz
RF = 300MHz to 3500MHz
–6
CONDITIONS
l
l
ac elecTrical characTerisTics
MIN
TYP
200 to 3500
300 to 3500
5 to 1000
>12
>12
950Ω || 1.2pF
0
< –25
< –21
>55
>23
MAX
UNITS
MHz
MHz
MHz
dB
dB
R||C
6
dBm
dBm
dBm
dB
dB
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
= 0dBm (0dBm/tone for 2-tone tests), unless otherwise noted. Test circuit shown in Figure 1.
(Notes 2, 3)
0.3GHz to 3.5GHz Downmixer Application: IF = 153MHz, ISEL = Low, unless otherwise noted. (Notes 2, 3)
PARAMETER
Power Conversion Gain
CONDITIONS
RF = 400MHz, High Side LO
RF = 850MHz, High Side LO
RF = 1950MHz, Low Side LO
RF = 2700MHz, Low Side LO
RF = 1870MHz ±100MHz, LO = 1700MHz, IF = 170 ±100MHz
T
C
= –40°C to 105°C, RF = 1950MHz, Low Side LO
RF = 400MHz, High Side LO
RF = 850MHz, High Side LO
RF = 1950MHz, Low Side LO
RF = 2700MHz, Low Side LO
RF = 400MHz (477MHz/323MHz), LO = 553MHz
RF = 850MHz (927MHz/773MHz), LO = 1053MHz
RF = 1950MHz (2027MHz/1873MHz), LO = 1797MHz
RF = 2700MHz (2777MHz/2623MHz), LO = 2547MHz
RF = 400MHz, High Side LO
RF = 850MHz, High Side LO
RF = 1950MHz, Low Side LO
RF = 2700MHz, Low Side LO
RF = 850MHz, High Side LO, 750MHz Blocker at 5dBm
RF = 1950MHz, Low Side LO, 2050MHz Blocker at 5dBm
850MHz: RF = 926.5MHz at –3dBm, LO = 1003MHz
1950MHz: RF = 1873.5MHz at –3dBm, LO = 1797MHz
850MHz: RF = 952MHz at –3dBm, LO = 1003MHz
1950MHz: RF = 1848MHz at –3dBm, LO = 1797MHz
RF = 400MHz, High Side LO
RF = 850MHz, High Side LO
RF = 1950MHz, Low Side LO
RF = 2700MHz, Low Side LO
MIN
TYP
3.2
2.8
2.4
1.7
±0.2
–0.013
33.2
35.2
35.5
38.1
65.8
68.2
58.4
57.1
10.6
9.1
9.7
10.9
16.5
16.9
–66
–68
–97
–93
17.1
17.8
18.0
18.7
MAX
UNITS
dB
dB
dB
dB
dB
dB/°C
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dB
dB
dB
dB
dB
dB
dBc
dBc
dBc
dBc
dBm
dBm
dBm
dBm
Conversion Gain Flatness
Conversion Gain vs Temperature
2-Tone Input 3
rd
Order Intercept
(∆f = 2MHz)
2-Tone Input 2
nd
Order Intercept
(∆f = 154MHz = f
IM2
)
SSB Noise Figure
SSB Noise Figure Under Blocking
1/2 IF Output Spurious Product
(f
RF
Offset to Produce Spur at f
IF
= 153MHz)
1/3 IF Output Spurious Product
(f
RF
Offset to Produce Spur at f
IF
= 153MHz)
Input 1dB Compression
5551fa
For more information
www.linear.com/LTC5551
3
LTC5551
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3.3V, EN = High, P
LO
= 0dBm, P
RF
= 0dBm (0dBm/tone for 2-tone
tests), unless otherwise noted. Test circuit shown in Figure 1. (Notes 2, 3)
Low Power Mode, 0.3GHz to 3.5GHz Downmixer Application: IF = 153MHz, ISEL = High (Notes 2, 3)
PARAMETER
Power Conversion Gain
CONDITIONS
RF = 400MHz, High Side LO
RF = 850MHz, High Side LO
RF = 1950MHz, Low Side LO
RF = 2700MHz, Low Side LO
RF = 400MHz, High Side LO
RF = 850MHz, High Side LO
RF = 1950MHz, Low Side LO
RF = 2700MHz, Low Side LO
RF = 400MHz, High Side LO
RF = 850MHz, High Side LO
RF = 1950MHz, Low Side LO
RF = 2700MHz, Low Side LO
RF = 400MHz, High Side LO
RF = 850MHz, High Side LO
RF = 1950MHz, Low Side LO
RF = 2700MHz, Low Side LO
MIN
TYP
3.0
2.7
2.4
1.7
27.3
28.0
29.3
29.7
9.8
8.2
8.3
9.2
14.8
16.2
16.7
17.7
MAX
UNITS
dB
dB
dB
dB
dBm
dBm
dBm
dBm
dB
dB
dB
dB
dBm
dBm
dBm
dBm
ac elecTrical characTerisTics
Input 3
rd
Order Intercept
SSB Noise Figure
Input 1dB Compression
Dc elecTrical characTerisTics
PARAMETER
Power Supply Requirements
Supply Voltage (V
CC
)
Supply Current (ISEL = Low)
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, ISEL = Low, unless otherwise noted. Test circuit
shown in Figure 1. (Note 2)
MIN
l
TYP
3.3
148
204
128
142
MAX
3.6
234
100
UNITS
VDC
mA
mA
µA
mA
mA
µA
VDC
2.5
EN = High, No LO Applied
EN = High, with LO Applied
EN = Low
EN = High, No LO Applied
EN = High, with LO Applied
EN = Low
l
l
Supply Current – Low Power Mode (ISEL = High)
100
Enable Logic Input (EN)
Input High Voltage (On)
Input Low Voltage (Off)
Input Current
Turn On Time
Turn Off Time
Power Select Logic Input (ISEL)
Input High Voltage (Low Power Mode)
Input Low Voltage (High Power Mode)
Input Current
Temperature Sensing Diode (TEMP)
DC Voltage at T
J
= 25°C
Voltage Temperature Coefficient
I
IN
= 10µA
I
IN
= 80µA
I
IN
= 10µA
I
IN
= 80µA
l
l
l
l
1.2
0.3
–30
0.4
0.5
1.2
0.3
–30
726
783
–1.72
–1.53
100
100
VDC
µA
µs
µs
VDC
VDC
µA
mV
mV
mV/°C
mV/°C
5551fa
–0.3V to V
CC
+ 0.3V
LO Applied
LO Applied
–0.3V to V
CC
+ 0.3V
4
For more information
www.linear.com/LTC5551
LTC5551
elecTrical characTerisTics
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 LTC5551 is guaranteed functional over the –40°C to 105°C
case temperature range.
Note 3:
SSB Noise Figure measurements performed with a small-signal
noise source, bandpass filter and 6dB matching pad on RF input, bandpass
filter and 6dB matching pad on the LO input, bandpass filter on the IF
output and no other RF signals applied.
Typical Dc perForMance characTerisTics
Supply Current vs Supply Voltage,
LO = 1800MHz at 0dBm
250
ISEL = LOW
200
150
100
50
0
–40
ISEL = HIGH
180
160
140
120
I
CC
(mA)
EN = High, Test circuit shown in Figure 1.
Supply Current vs Supply Voltage,
No LO Applied
ISEL = LOW
250
200
150
100
50
Supply Current vs LO Frequency
(P
LO
= 0dBm)
ISEL = LOW
I
CC
(mA)
80
60
I
CC
(mA)
100
ISEL = HIGH
ISEL = HIGH
V
CC
= 3.5V
V
CC
= 3.3V
V
CC
= 3.1V
–15
35
10
60
85
CASE TEMPERATURE (°C)
110
5551 G01
40
20
0
–40
–15
V
CC
= 3.5V
V
CC
= 3.3V
V
CC
= 3.1V
35
10
60
85
CASE TEMPERATURE (°C)
110
5551 G02
0
300 700 1100 1500 1900 2300 2700 3100 3500
LO FREQUENCY (MHz)
5551 G03
T
C
= 105°C
T
C
= 85°C
T
C
= 25°C
T
C
= –40°C
Supply Current vs V
CC
LO = 1800MHz at 0dBm
220
220
Supply Current vs V
CC
LO = 1800MHz at T
C
= 25°C
190
I
CC
(mA)
I
CC
(mA)
T
C
= 105°C
T
C
= 85°C
T
C
= 25°C
T
C
= –40°C
190
160
160
130
130
LO = 6dBm
LO = 0dBm
LO = –6dBm
100
2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
V
CC
(V)
5551 G04
100
2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
V
CC
(V)
5551 G05
5551fa
For more information
www.linear.com/LTC5551
5
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