FeaTures
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LTC5540
600MHz to 1.3GHz
High Dynamic Range
Downconverting Mixer
DescripTion
The LTC
®
5540 is part of a family of high dynamic range, high
gain passive downconverting mixers covering the 600MHz
to 4GHz frequency range.
The LTC5540 is optimized for
0.6GHz to 1.3GHz RF applications. The LO frequency
must fall within the 0.7GHz to 1.2GHz range for optimum
performance.
A typical application is a LTE or GSM receiver
with a 700MHz to 915MHz RF input and high-side LO.
The LTC5540 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 LTC5540’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: 7.9dB at 900MHz
IIP3: 25.9dBm at 900MHz
Noise Figure: 9.9dB at 900MHz
16.2dB NF Under +5dBm Blocking
High Input P1dB
3.3V Supply, 640mW 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
n
n
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Wireless Infrastructure Receivers
(LTE, GSM, W-CDMA)
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
22pF
150nH
IF
+
IF
RF
LO
1nF
150nH
IF
–
LTC5540
LO2
190MHz
SAW
IF
AMP
190MHz
BPF
ADC
16
15
14
100pF
SYNTH 2
ALTERNATE LO FOR
FREQUENCY-HOPPING
100pF
SHDN
BIAS
V
CC2
V
CC
3.3V
1µF
V
CC1
22pF
V
CC3
LO1
LOSEL
LO SELECT
(0V/3.3V)
SYNTH 1
LO
1090MHz
5540 TA01
Wideband Conversion Gain, IIP3
and NF vs RF Input Frequency
28
27
26
T
A
= +25°C
f
IF
= 190MHz
f
LO
= f
RF
+ f
IF
IIP3
25
24
23
22
21
G
C
20
19
800
700
900
RF FREQUENCY (MHz)
18
1000
5540 TA01a
1µF
1.5pF
G
C
(dB), NF (dB)
CT
13
12
11
10
9
8
7
6
600
NF
IIP3 (dBm)
RF
700MHz
TO
915MHz
5.6pF
LNA
IMAGE
BPF
SHDN
(0V/3.3V)
5540f
LTC5540
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 (0.2GHz to 2GHz) ...............9dBm
LO1, LO2 Input DC Voltage ....................................±0.5V
RF Input Power (0.2GHz to 2GHz) ........................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
LTC5540IUH#PBF
TAPE AND REEL
LTC5540IUH#TRPBF
PART MARKING
5540
PACKAGE DESCRIPTION
20-Lead (5mm
×
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
700 to 1200
800 to 1300
600 to 1100
5 to 500
>12
>12
>12
–4
0
<–30
<–37
>50
>47
>55
>37
6
MAX
UNITS
MHz
MHz
MHz
MHz
dB
dB
dB
dBm
dBm
dBm
dB
dB
dB
dB
5540f
Requires External Matching
Z
O
= 50Ω, 600MHz to 1300MHz
Z
O
= 50Ω, 700MHz to 1200MHz
Requires External Matching
f
LO
= 700MHz to 1200MHz
f
LO
= 700MHz to 1200MHz
f
LO
= 700MHz to 1200MHz
LO1 Selected, 700MHz < f
LO
< 1200MHz
LO2 Selected, 700MHz < f
LO
< 1200MHz
f
RF
= 600MHz to 1300MHz
f
RF
= 600MHz to 1300MHz
LTC5540
ac elecTrical characTerisTics
PARAMETER
Conversion Gain
CONDITIONS
RF = 700MHz
RF = 900MHz
RF = 1100MHz
RF = 900 ±30MHz, LO = 1090MHz, IF=190 ±30MHz
T
A
= –40ºC to +85ºC, RF = 900MHz
RF = 700MHz
RF = 900MHz
RF = 1100MHz
RF = 700MHz
RF = 900MHz
RF = 1100MHz
f
RF
= 900MHz, f
LO
= 1090MHz,
f
BLOCK
= 800MHz, P
BLOCK
= 5dBm
f
RF
= 995MHz at –10dBm, f
LO
= 1090MHz, f
IF
= 190MHz
f
RF
= 1026.67MHz at –10dBm, f
LO
= 1090MHz, f
IF
= 190MHz
RF = 900MHz, V
CCIF
= 3.3V
RF = 900MHz, V
CCIF
= 5V
CONDITIONS
RF = 900MHz
RF = 1100MHz
RF = 1300MHz
RF = 900MHz ±30MHz, LO = 710MHz, IF = 190 ±30MHz
T
A
= –40°C to 85°C, RF = 900MHz
RF = 900MHz
RF = 1100MHz
RF = 1300MHz
RF = 900MHz
RF = 1100MHz
RF = 1300MHz
f
RF
= 900MHz, f
LO
= 710MHz, f
IF
= 190MHz,
f
BLOCK
= 1000MHz, P
BLOCK
= 5dBm
f
RF
= 805MHz at –10dBm, f
LO
= 710MHz,
f
IF
= 190MHz
f
RF
= 773.33MHz at –10dBm, f
LO
= 710MHz,
f
IF
= 190MHz
RF = 900MHz, V
CCIF
= 3.3V
RF = 900MHz, V
CCIF
= 5V
MIN
23.4
V
CC
= 3.3V, V
CCIF
= 3.3V, SHDN = Low, T
A
= 25°C, P
LO
= 0dBm,
P
RF
= –3dBm (∆f = 2MHz for two-tone IIP3 tests),unless otherwise noted. Test circuit shown in Figure 1. (Notes 2, 3, 4)
MIN
6.3
TYP
7.6
7.9
7.9
±0.20
–0.008
26.5
25.9
23.8
10.0
9.9
10.4
16.2
–70
–75
11
14.5
TYP
7.0
7.8
8.0
±0.33
–0.007
24.4
24.1
23.6
10.6
10.5
10.3
16.7
–61.5
–68
11
14
MAX
11.7
MAX
UNITS
dB
dB
dB
dB
dB/°C
dBm
dBm
dBm
dB
dB
dB
dB
dBc
dBc
dBm
dBm
UNITS
dB
dB
dB
dB
dB/°C
dBm
dBm
dBm
dB
dB
dB
dB
dBc
dBc
dBm
dBm
High-Side LO Downmixer Application: RF = 600MHz to 1100MHz, IF = 190MHz, f
LO
= f
RF
+f
IF
Conversion Gain Flatness
Conversion Gain vs Temperature
Input 3
rd
Order Intercept
SSB Noise Figure
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 = 800MHz-1300MHz, IF = 190MHz, f
LO
= f
RF
–f
IF
PARAMETER
Conversion Gain
Conversion Gain Flatness
Conversion Gain vs Temperature
Input 3rd Order Intercept
SSB Noise Figure
SSB Noise Figure Under Blocking
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
5540f
LTC5540
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 LTC5540 is guaranteed functional over the operating
temperature range from –40°C to 85°C.
–0.3V to V
CC
+ 0.3V
–20
50
Note 3:
SSB Noise Figure measured 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.
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
97
96
193
3.5
5.3
116
120
236
500
V
V
mA
mA
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
Typical Dc perForMance characTerisTics
V
CC
Supply Current
vs Supply Voltage
(Mixer and LO Switch)
110
105
SUPPLY CURRENT (mA)
100
95
90
85
80
3.0
85°C
25°C
–40°C
SUPPLY CURRENT (mA)
150
SHDN = Low, Test circuit shown in Figure 1.
V
CCIF
Supply Current
vs Supply Voltage (IF Amplifier)
85°C
25°C
–40°C
SUPPLY CURRENT (mA)
220
210
200
190
180
170
Total Supply Current
vs Temperature (V
CC
+ V
CCIF
)
130
110
V
CC
= 3.3V, V
CCIF
= 5V
(DUAL SUPPLY)
90
V
CC
= V
CCIF
= 3.3V
(SINGLE SUPPLY)
70
3.1
3.3
3.2
3.4
3.5
V
CC
SUPPLY VOLTAGE (V)
3.6
5540 G01
50
3.0
3.3
3.6 3.9 4.2 4.5 4.8 5.1
V
CCIF
SUPPLY VOLTAGE (V)
5.4
160
–45
–25
–5
15
55
35
TEMPERATURE (°C)
75
95
5540 G02
5540 G03
5540f
LTC5540
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, ∆f = 2MHz),
IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1.
Conversion Gain, IIP3 and NF
vs RF Frequency
LO Leakage vs LO Frequency
RF Isolation vs RF Frequency
28
26
24
G
C
(dB), IIP3 (dBm)
22
20
18
16
14
12
10
8
6
600
G
C
700
800
900
1000
RF FREQUENCY (MHz)
NF
IIP3
22
20
18
LO LEAKAGE (dBm)
85°C 16
25°C
14
–40°C
12
10
8
6
4
2
0
1100
5540 G04
Typical ac perForMance characTerisTics
–10
65
60
–20
ISOLATION (dB)
LO-RF
55
50
45
40
35
30
RF-LO
–30
SSB NF (dB)
–40
LO-IF
–50
RF-IF
–60
700
800
900
1000
1100
LO FREQUENCY (MHz)
1200
5540 G05
25
600
700
800 900 1000 1100 1200 1300
RF FREQUENCY (MHz)
5540 G06
700MHz Conversion Gain, IIP3
and NF vs LO Input Power
28
26
24
G
C
(dB), IIP3 (dBm)
22
20
18
16
14
12
10
8
6
–6
G
C
–4
–2
0
2
4
LO INPUT POWER (dBm)
6
5540 G07
900MHz Conversion Gain, IIP3
and NF vs LO Input Power
22
20
28
26
24
G
C
(dB), IIP3 (dBm)
22
20
18
16
14
12
10
8
6
–6
G
C
NF
IIP3
22
20
18
85°C 16
25°C
–40°C 14
12
10
8
6
4
2
–4
–2
0
2
4
LO INPUT POWER (dBm)
6
5540 G08
1100MHz Conversion Gain, IIP3
and NF vs LO Input Power
28
26
24
G
C
(dB), IIP3 (dBm)
22
20
18
16
14
12
10
8
6
–6
G
C
85°C
25°C
–40°C
NF
IIP3
22
20
18
16
14
12
10
8
6
4
2
–4
–2
0
2
4
LO INPUT POWER (dBm)
6
5540 G09
IIP3
18
85°C 16
25°C
–40°C 14
12
10
NF
8
6
4
2
0
SSB NF (dB)
SSB NF (dB)
SSB NF (dB)
0
0
Conversion Gain, IIP3 and NF
vs Supply Voltage (Single Supply)
28
26
24
G
C
(dB), IIP3 (dBm)
22
IIP3
22
20
18
G
C
(dB), IIP3 (dBm)
85°C 16
25°C
–40°C 14
12
10
NF
G
C
8
6
4
2
3.2
3.3
3.1
3.4
3.5
V
CC
, V
CCIF
SUPPLY VOLTAGE (V)
3.6
5540 G10
Conversion Gain, IIP3 and NF
vs IF Supply Voltage (Dual Supply)
28
26
24
22
IIP3
22
20
G
C
(dB), IIP3 (dBm), P1dB (dBm)
18
85°C 16
25°C
–40°C 14
12
10
NF
G
C
8
6
4
2
4
4.5
3.5
5
V
CCIF
SUPPLY VOLTAGE (V)
5.5
5540 G11
900MHz Conversion Gain, IIP3
and RF Input P1dB vs Temperature
28
26
24
22
20
18
16
14
12
10
8
6
–45
G
C
–25
–5 15
35 55
TEMPERATURE (°C)
75
95
5540 G12
IIP3
RF = 900MHz
20
V
CC
= V
CCIF
18
16
14
12
10
8
6
3.0
RF = 900MHz
20
V
CC
= 3.3V
18
16
14
12
10
8
6
3.0
RF = 900MHz
V
CCIF
= 5.0V
V
CCIF
= 3.3V
SSB NF (dB)
SSB NF (dB)
P1dB
0
0
5540f
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