FEATURES
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LTC5543
2.3GHz to 4GHz
High Dynamic Range
Downconverting Mixer
DESCRIPTION
The LTC
®
5543 is part of a family of high dynamic range, high
gain passive downconverting mixers covering the 600MHz to
4GHz frequency range.
The LTC5543 is optimized for 2.3GHz
to 4GHz RF applications. The LO frequency must fall within
the 2.4GHz to 3.6GHz range for optimum performance.
A
typical application is a LTE or WiMAX receiver with a 2.3GHz
to 2.7GHz RF input and high-side LO.
The LTC5543 is designed for 3.3V operation, however; the
IF amplifier can be powered by 5V for the highest P1dB.
An integrated SPDT LO switch with fast switching accepts
two active LO signals, while providing high isolation.
The LTC5543’s high conversion gain and high dynamic
range enable the use of lossy IF filters in high-selectivity
receiver designs, while minimizing the total solution cost,
board space and system-level variation.
High Dynamic Range Downconverting Mixer Family
PART#
LTC5540
LTC5541
LTC5542
LTC5543
RF RANGE
600MHz –1.3GHz
1.3GHz – 2.3GHz
1.6GHz – 2.7GHz
2.3GHz – 4GHz
LO RANGE
700MHz – 1.2GHz
1.4GHz – 2.0GHz
1.7GHz – 2.5GHz
2.4GHz – 3.6GHz
Conversion Gain: 8.4dB at 2500MHz
IIP3: 24.5dBm at 2500MHz
Noise Figure: 10.2dB at 2500MHz
17.5dB NF Under +5dBm Blocking
High Input P1dB
3.3V Supply, 660mW Power Consumption
Shutdown Pin
50Ω Single-Ended RF and LO Inputs
LO Inputs 50Ω Matched when Shutdown
High Isolation LO Switch
0dBm LO Drive Level
High LO-RF and LO-IF Isolation
Small Solution Size
20-Lead (5mm
×
5mm) QFN package
APPLICATIONS
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Wireless Infrastructure Receivers
(LTE, WiMAX, WCS)
Point-To-Point Microwave Links
High Dynamic Range Downmixer 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.
TYPICAL APPLICATION
Wideband Receiver
1nF
V
CCIF
3.3V or 5V
1nF
150nH
IF
+
IMAGE
BPF
LNA
0.8pF
IF
1.2nH
RF
LO
IF
–
2.7pF
LTC5543
LO2
SYNTH 2
G
C
(dB)
ALTERNATE LO FOR
FREQUENCY-HOPPING
2.7pF
SHDN
(0V/3.3V)
SHDN
BIAS
V
CC2
V
CC
3.3V
1μF
V
CC1
22pF
V
CC3
LO1
LOSEL
LO SELECT
(0V/3.3V)
SYNTH 1
LO
2725MHz
5543 TA01
190MHz
SAW
IF
AMP
190MHz
BPF
ADC
9.0
8.9
Wideband Conversion Gain, IIP3
and NF vs IF Output Frequency
26
IIP3
24
22
IIP3 (dBm), SSB NF (dB)
20
18
16
G
C
14
12
NF
10
8
165 175 185 195 205 215
IF OUTPUT FREQUENCY (MHz)
6
225
1μF
22pF
150nH
f
LO
= 2725MHz
8.8 P
LO
= 0dBm
RF = 2535 ±35MHz
8.7
TEST CIRCUIT IN FIGURE 1
8.6
8.5
8.4
8.3
8.2
8.1
8.0
155
RF
2500MHz
TO
2570MHz
5543 TA02
5543f
1
LTC5543
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
IFBIAS
IFGND
15 LO2
21
GND
14 V
CC3
13 GND
12 GND
11 LO1
6
V
CC2
7
LOBIAS
8
V
CC1
9 10
LOSEL
GND
GND
IF
+
IF
–
Mixer Supply Voltage (V
CC1
, V
CC2
)...........................3.8V
LO Switch Supply Voltage (V
CC3
).............................3.8V
IF Supply Voltage (IF
+
, IF
–
) ......................................5.5V
Shutdown Voltage (SHDN) ................–0.3V to V
CC
+0.3V
LO Select Voltage (LOSEL)................–0.3V to V
CC
+0.3V
LO1, LO2 Input Power (2GHz to 4GHz) ..................9dBm
LO1, LO2 Input DC Voltage ....................................±0.5V
RF Input Power (2GHz to 4GHz) ...........................15dBm
RF Input DC Voltage ............................................... ±0.1V
Operating Temperature Range .................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Junction Temperature (T
J
) .................................... 150°C
20 19 18 17 16
NC 1
RF 2
CT 3
GND 4
SHDN 5
UH PACKAGE
20-LEAD (5mm 5mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 34°C/W,
θ
JC
= 3°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC5543IUH#PBF
TAPE AND REEL
LTC5543IUH#TRPBF
PART MARKING
5543
PACKAGE DESCRIPTION
20-Lead (5mm x 5mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 85°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/
AC ELECTRICAL CHARACTERISTICS
PARAMETER
LO Input Frequency Range
RF Input Frequency Range
IF Output Frequency Range
RF Input Return Loss
LO Input Return Loss
IF Output Return Loss
LO Input Power
LO to RF Leakage
LO to IF Leakage
LO Switch Isolation
RF to LO Isolation
RF to IF Isolation
Low-Side LO
High-Side LO
CONDITIONS
V
CC
= 3.3V, V
CCIF
= 3.3V, SHDN = Low, T
A
= 25°C, P
LO
= 0dBm,
unless otherwise noted. Test circuit shown in Figure 1. (Notes 2, 3, 4)
MIN
TYP
2400 to 3600
2400 to 4000
2200 to 3200
5 to 600
>12
>12
>12
–4
0
<–28
<–35
>44
>47
>37
>33
6
MAX
UNITS
MHz
MHz
MHz
MHz
dB
dB
dB
dBm
dBm
dBm
dB
dB
dB
dB
5543f
Requires External Matching
Z
O
= 50Ω, 2200MHz to 3800MHz
Z
O
= 50Ω, 2400MHz to 3600MHz
Requires External Matching
f
LO
= 2400MHz to 3600MHz
f
LO
= 2400MHz to 3600MHz
f
LO
= 2400MHz to 3600MHz
LO1 Selected, 2400MHz < f
LO
< 3600MHz
LO2 Selected, 2400MHz < f
LO
< 3600MHz
f
RF
= 2200MHz to 4000MHz
f
RF
= 2200MHz to 4000MHz
2
LTC5543
V
CC
= 3.3V, V
CCIF
= 3.3V, SHDN = Low, T
A
= 25°C, P
LO
= 0dBm,
P
RF
= –3dBm (Δf = 2MHz for two-tone IIP3 tests),unless otherwise noted. Test circuit shown in Figure 1. (Notes 2, 3, 4)
High-Side LO Downmixer Application: RF = 2300MHz to 2700MHz, IF = 190MHz, f
LO
= f
RF
+f
IF
PARAMETER
Conversion Gain
CONDITIONS
RF = 2300MHz
RF = 2500MHz
RF = 2700MHz
RF = 2500 ±30MHz, LO = 2690MHz, IF=190 ±30MHz
T
A
= –40°C to +85°C, RF = 2500MHz
RF = 2300MHz
RF = 2500MHz
RF = 2700MHz
RF = 2300MHz
RF = 2500MHz
RF = 2700MHz
f
RF
= 2500MHz, f
LO
= 2690MHz,
f
BLOCK
= 2300MHz, P
BLOCK
= 5dBm
f
RF
= 2595MHz at –10dBm, f
LO
= 2690MHz, f
IF
= 190MHz
f
RF
= 2626.67MHz at –10dBm, f
LO
= 2690MHz, f
IF
= 190MHz
RF = 2500MHz, V
CCIF
= 3.3V
RF = 2500MHz, V
CCIF
= 5V
CONDITIONS
RF = 2600MHz
RF = 3300MHz
RF = 3500MHz
RF = 3500MHz ±30MHz, LO = 3310MHz, IF = 190 ±30MHz
T
A
= –40°C to 85°C, RF = 3500MHz
RF = 2600MHz
RF = 3300MHz
RF = 3500MHz
RF = 2600MHz
RF = 3300MHz
RF = 3500MHz
f
RF
= 3405MHz at –10dBm, f
LO
= 3310MHz
f
IF
= 190MHz
f
RF
= 3373.33MHz at –10dBm, f
LO
= 3310MHz
f
IF
= 190MHz
RF = 3500MHz, V
CCIF
= 3.3V
RF = 3500MHz, V
CCIF
= 5V
MIN
22.5
MIN
7.0
TYP
8.9
8.4
8.2
±0.1
–0.007
23.8
24.5
24.4
9.9
10.2
10.4
17.5
–61
–74
10.9
13.9
TYP
8.9
7.1
6.7
±0.15
–0.004
24.7
25.6
25.1
9.6
11.6
11.8
–50
–77
11.3
11.8
MAX
11.9
MAX
UNITS
dB
dB
dB/°C
dBm
AC ELECTRICAL CHARACTERISTICS
Conversion Gain Flatness
Conversion Gain vs Temperature
Input 3
rd
Order Intercept
SSB Noise Figure
dB
dB
dBc
dBc
dBm
SSB Noise Figure Under Blocking
2LO – 2RF Output Spurious Product
(f
RF
= f
LO
– f
IF
/2)
3LO – 3RF Output Spurious Product
(f
RF
= f
LO
– f
IF
/3)
Input 1dB Compression
Low-Side LO Downmixer Application: RF = 2400MHz to 3800MHz, IF = 190MHz, f
LO
= f
RF
–f
IF
PARAMETER
Conversion Gain
UNITS
dB
5.3
Conversion Gain Flatness
Conversion Gain vs Temperature
Input 3rd Order Intercept
dB
dB/°C
dBm
22.5
SSB Noise Figure
dB
dBc
dBc
dBm
2RF – 2LO Output Spurious Product
(f
RF
= f
LO
+ f
IF/2
)
3RF – 3LO Output Spurious Product
(f
RF
= f
LO
+ f
IF/3
)
Input 1dB Compression
5543f
3
LTC5543
noted. Test circuit shown in Figure 1. (Note 2)
PARAMETER
Power Supply Requirements (V
CC
, V
CCIF
)
V
CC
Supply Voltage (Pins 6, 8 and 14)
V
CCIF
Supply Voltage (Pins 18 and 19)
V
CC
Supply Current (Pins 6 + 8 + 14)
V
CCIF
Supply Current (Pins 18 + 19)
Total Supply Current (V
CC
+ V
CCIF
)
Total Supply Current – Shutdown
SHDN Input High Voltage (Off)
SHDN Input Low Voltage (On)
SHDN Input Current
Turn On Time
Turn Off Time
LO Select Logic Input (LOSEL) Low = LO1 Selected, High = LO2 Selected
LOSEL Input High Voltage
LOSEL Input Low Voltage
LOSEL Input Current
LO Switching Time
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 LTC5543 is guaranteed functional over the operating
temperature range from –40°C to 85°C.
–0.3V to V
CC
+ 0.3V
–20
50
3
0.3
30
V
V
μA
ns
–0.3V to V
CC
+ 0.3V
–20
1
1.5
SHDN = High
3
0.3
30
Shutdown Logic Input (SHDN) Low = On, High = Off
V
V
μA
μs
μs
3.1
3.1
3.3
3.3
99
102
201
3.5
5.3
116
122
238
500
V
V
mA
μA
DC ELECTRICAL CHARACTERISTICS
CONDITIONS
V
CC
= 3.3V, V
CCIF
= 3.3V, SHDN = Low, T
A
= 25°C, unless otherwise
MIN
TYP
MAX
UNITS
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, and no other RF signals
applied.
Note 4:
LO switch isolation is measured at the IF output port at the IF
frequency with f
LO1
and f
LO2
offset by 2MHz.
TYPICAL DC PERFORMANCE CHARACTERISTICS
V
CC
Supply Current
vs Supply Voltage
(Mixer and LO Switch)
110
108
106
SUPPLY CURRENT (mA)
SUPPLY CURRENT(mA)
104
102
100
98
96
94
92
90
3.0
3.1
3.4
3.2
3.3
3.5
V
CC
SUPPLY VOLTAGE (V)
3.6
5543 G01
SHDN = Low, Test circuit shown in Figure 1.
V
CCIF
Supply Current
vs Supply Voltage (IF Amplifier)
125
85°C
115
SUPPLY CURRENT(mA)
230
220
210
200
190
180
Total Supply Current
vs Temperature (V
CC
+ V
CCIF
)
85°C
25°C
–40°C
105
25°C
95
V
CC
= 3.3V, V
CCIF
= 5V
(DUAL SUPPLY)
V
CC
= V
CCIF
= 3.3V
(SINGLE SUPPLY)
85
–40°C
75
3.0
3.3
3.6 3.9 4.2 4.5 4.8 5.1
V
CCIF
SUPPLY VOLTAGE (V)
5.4
170
–45
–25
55
–5
15
35
TEMPERATURE (°C)
75
95
5543 G02
5543 G03
5543f
4
LTC5543
High-Side LO
V
CC
= 3.3V, V
CCIF
= 3.3V, SHDN = Low, T
A
= 25°C, P
LO
= 0dBm, P
RF
= –3dBm (–3dBm/tone for two-tone IIP3 tests,
Δ
f = 2MHz),
IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1.
Conversion Gain, IIP3 and NF
vs RF Frequency
26
IIP3
15
–20
TYPICAL AC PERFORMANCE CHARACTERISTICS
LO Leakage vs LO Frequency
RF Isolation vs RF Frequency
55
RF-IF
24
13
GC (dB), SSB NF (dB)
LO LEAKAGE (dBm)
–30
LO-RF
ISOLATION (dB)
50
IIP3 (dBm)
22
NF
20
G
C
18
11
45
RF-LO
–40
LO-IF
9
40
7
–50
35
16
2.2
2.4
2.6
2.8
3.0
RF FREQUENCY (GHz)
5
3.2
5543 G04
–60
2.4
2.6
2.8
3.0
3.2
LO FREQUENCY (GHz)
3.4
3.6
5543 G05
30
2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0
RF FREQUENCY (GHz)
5543 G06
2300MHz Conversion Gain, IIP3
and NF vs LO Power
27
25
23
G
C
(dB), IIP3 (dBm)
21
19
17
15
13
11
9
7
–6
–4
4
–2
0
2
LO INPUT POWER (dBm)
6
5543 G07
2500MHz Conversion Gain, IIP3
and NF vs LO Power
20
18
27
25
23
G
C
(dB), IIP3 (dBm)
21
19
17
15
13
11
9
7
–6
–4
4
–2
0
2
LO INPUT POWER (dBm)
6
5543 G08
2700MHz Conversion Gain, IIP3
and NF vs LO Power
20
27
25 IIP3
23
G
C
(dB), IIP3 (dBm)
21
19
17
15
13
11
9
7
–6
–4
4
–2
0
2
LO INPUT POWER (dBm)
6
5543 G09
21
19
17
85°C
25°C
15
–40°C
13
11
NF
9
7
5
G
C
3
1
IIP3
IIP3
18
85°C
16
25°C
14
–40°C
12
10
NF
8
6
4
NF
16
85°C
25°C
14
–40°C
12
10
8
6
SSB NF (dB)
SSB NF (dB)
SSB NF (dB)
G
C
4
2
0
G
C
2
0
Conversion Gain, IIP3 and NF
vs Supply Voltage (Single Supply)
25
23
21
G
C
(dB), IIP3 (dBm)
19
17
15
13
11
9
7
3.0
G
C
NF
IIP3
20
18
85°C
16
25°C
–40°C
14
SSB NF (dB)
12
10
8
25
23
21
G
C
(dB), IIP3 (dBm)
19
17
15
13
11
9
Conversion Gain, IIP3 and NF
vs IF Supply Voltage (Dual Supply)
20
G
C
(dB), IIP3 (dBm), P1dB (dBm)
IIP3
18
85°C
16
25°C
–40°C
14
SSB NF (dB)
NF
12
10
8
G
C
RF = 2500MHz
6
V
CC
= 3.3V
4
3.6 3.9 4.2 4.5 4.8 5.1
V
CCIF
SUPPLY VOLTAGE (V)
2
5.4
25
23
21
19
17
15
13
Conversion Gain, IIP3 and RF
Input P1dB vs Temperature
IIP3
RF = 2500MHz
V
CCIF
= 5.0V
V
CCIF
= 3.3V
RF = 2500MHz
6
V
CC
= V
CCIF
4
3.5
3.1
3.2
3.3
3.4
V
CC
, V
CCIF
SUPPLY VOLTAGE (V)
2
3.6
5543 G10
P1dB
11
9
G
C
7
–45 –25
7
3.0
3.3
–5
15
35
55
TEMPERATURE (°C)
75
95
5543 G11
5543 G12
5543f
5
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