FeaTures
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LTC5544
4GHz to 6GHz
High Dynamic Range
Downconverting Mixer
DescripTion
The LTC
®
5544 is part of a family of high dynamic range, high
gain passive downconverting mixers covering the 600MHz
to 6GHz frequency range.
The LTC5544 is optimized for
4GHz to 6GHz RF applications. The LO frequency must
fall within the 4.2GHz to 5.8GHz range for optimum
performance.
A typical application is a WiMAX receiver
with a 5.15GHz to 5.35GHz RF input and low side LO.
The LTC5544 is designed for 3.3V operation, however; the
IF amplifier can be powered with 5V for the higher P1dB.
The LTC5544’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.
High Dynamic Range Downconverting Mixer Family
PART#
LTC5540
LTC5541
LTC5542
LTC5543
LTC5544
RF RANGE
600MHz to 1.3GHz
1.3GHz to 2.3GHz
1.6GHz to 2.7GHz
2.3GHz to 4GHz
4GHz to 6GHz
LO RANGE
700MHz to 1.2GHz
1.4GHz to 2.0GHz
1.7GHz to 2.5GHz
2.4GHz to 3.6GHz
4.2GHz to 5.8GHz
Conversion Gain: 7.4dB at 5250MHz
IIP3: 25.9dBm at 5250MHz
Noise Figure: 11.3dB at 5250MHz
High Input P1dB
IF Bandwidth Up to 1GHz
640mW Power Consumption
Shutdown Pin
50Ω Single-Ended RF and LO Inputs
+2dBm LO Drive Level
High LO-RF and LO-IF Isolation
–40°C to 105°C Operation (T
C
)
Small Solution Size
16-Lead (4mm × 4mm) QFN package
applicaTions
n
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5GHz WiMAX/WLAN Receiver
4.9GHz Public Safety Bands
4.9GHz to 6GHz Military Communications
Point-to-Point Broadband Communications
Radar Systems
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
150nH
1nF
150nH
IF
+
IMAGE
BPF 0.6pF
LNA
2.2nH
SHDN
(0V/3.3V)
V
CC
3.3V
BIAS
V
CC1
1µF
V
CC2
22pF
5544 TA01a
240MHz
SAW
LTC6416
IF
AMP
LTC2208
ADC
8.5
8.3
8.1
Wideband Conversion Gain, IIP3
and NF vs IF Output Frequency
29
IIP3
27
25
IIP3 (dBm), SSB NF (dB)
23
21
G
C
19
17
15
NF
13
11
9
275
1µF
22pF
IF
–
G
C
(dB)
IF
RF
LTC5544
1.2pF
SYNTH
LO
LO
5010MHz
RF
5150MHz
TO
5350MHz
f
LO
= 5010MHz
7.9 P
LO
= 2dBm
RF = 5250 ±35MHz
7.7
TEST CIRCUIT IN FIGURE 1
7.5
7.3
7.1
6.9
6.7
6.5
205
SHDN
215 225 235 245 255 265
IF OUTPUT FREQUENCY (MHz)
5544 TA01b
5544f
1
LTC5544
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
TOP VIEW
IFBIAS
IFGND
12 TEMP
17
GND
11 GND
10 LO
9
5
V
CC1
6
LOBIAS
7
V
CC2
8
GND
GND
IF
+
IF
–
Mixer Supply Voltage (V
CC1
, V
CC2
)...........................4.0V
IF Supply Voltage (IF
+
, IF
–
) ......................................5.5V
Shutdown Voltage (SHDN) ................–0.3V to V
CC
+0.3V
IF Bias Adjust Voltage (IFBIAS) .........–0.3V to V
CC
+0.3V
LO Bias Adjust Voltage (LOBIAS) ......–0.3V to V
CC
+0.3V
LO Input Power (4GHz to 6GHz)...........................+9dBm
LO Input DC Voltage............................................... ±0.1V
RF Input Power (4GHz to 6GHz) ......................... +15dBm
RF Input DC Voltage ............................................... ±0.1V
TEMP Diode Continuous DC Input Current.............10mA
TEMP Diode Input Voltage ........................................ ±1V
Operating Temperature Range (T
C
) ........ –40°C to 105°C
Storage Temperature Range .................. –65°C to 150°C
Junction Temperature (T
J
) .................................... 150°C
16 15 14 13
GND 1
RF 2
CT 3
SHDN 4
UF PACKAGE
16-LEAD (4mm
×
4mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JC
= 8°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LTC5544IUF#PBF
TAPE AND REEL
LTC5544IUF#TRPBF
PART MARKING
5544
PACKAGE DESCRIPTION
16-Lead (4mm x 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/
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 Impedance
LO Input Power
LO to RF Leakage
LO to IF Leakage
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
C
= 25°C, P
LO
= 2dBm,
unless otherwise noted. Test circuit shown in Figure 1. (Notes 2, 3)
MIN
TYP
4200 to 5800
4200 to 6000
4000 to 5800
5 to 1000
>12
>12
332Ω || 1.7pF
–1
2
<–30
<–21
>38
>29
5
MAX
UNITS
MHz
MHz
MHz
MHz
dB
dB
R||C
dBm
dBm
dBm
dB
dB
Requires External Matching
Z
O
= 50Ω, 4000MHz to 6000MHz
Z
O
= 50Ω, 4200MHz to 5800MHz
Differential at 240MHz
f
LO
= 4200MHz to 5800MHz
f
LO
= 4200MHz to 5800MHz, Requires C2
f
LO
= 4200MHz to 5800MHz
f
RF
= 4000MHz to 6000MHz
f
RF
= 4000MHz to 6000MHz
5544f
2
LTC5544
V
CC
= 3.3V, V
CCIF
= 3.3V, SHDN = Low, T
C
= 25°C, P
LO
= 2dBm,
P
RF
= –3dBm (–3dBm/tone for 2-tone tests),unless otherwise noted. Test circuit shown in Figure 1. (Notes 2, 3)
Low Side LO Downmixer Application: RF = 4200MHz to 6000MHz, IF = 240MHz, f
LO
= f
RF
– f
IF
PARAMETER
Conversion Gain
CONDITIONS
RF = 4900MHz
RF = 5250MHz
RF = 5800MHz
RF = 5250MHz ±30MHz, LO = 5010MHz, IF = 240 ±30MHz
T
C
= –40°C to 105°C, RF = 5250MHz
RF = 4900MHz
RF = 5250MHz
RF = 5800MHz
f
RF1
= 5371MHz, f
RF2
= 5130MHz,
f
LO
= 5010MHz
RF = 4900MHz
RF = 5250MHz
RF = 5800MHz
f
RF
= 5250MHz, f
LO
= 5010MHz,
f
BLOCK
= 4910MHz, P
BLOCK
= 5dBm
f
RF
= 5130MHz at –10dBm, f
LO
= 5010MHz, f
IF
= 240MHz
f
RF
= 5090MHz at –10dBm, f
LO
= 5010MHz, f
IF
= 240MHz
MIN
6.0
TYP
7.9
7.4
6.4
±0.15
–0.007
25.4
25.9
25.8
43.2
MAX
UNITS
dB
dB
dB/°C
dBm
dBm
ac elecTrical characTerisTics
Conversion Gain Flatness
Conversion Gain vs Temperature
2-Tone Input 3
rd
Order Intercept
(∆f = 2MHz)
2-Tone Input 2
nd
Order Intercept
(∆f = 241MHz, f
IM2
= f
RF1
– f
RF2
)
SSB Noise Figure
10.3
11.3
12.8
16.9
–58.3
–77
dB
dB
dBc
dBc
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
RF = 5250MHz, V
CCIF
= 3.3V
RF = 5250MHz, V
CCIF
= 5V
11.4
14.6
dBm
High Side LO Downmixer Application: RF = 4000MHz to 5800MHz, IF = 240MHz, f
LO
= f
RF
+ f
IF
PARAMETER
Conversion Gain
CONDITIONS
RF = 4500MHz
RF = 4900MHz
RF = 5250MHz
RF = 4900MHz ±30MHz, LO = 5356MHz, IF = 456 ±30MHz
T
C
= –40°C to 105°C, RF = 4900MHz
RF = 4500MHz
RF = 4900MHz
RF = 5250MHz
f
RF1
= 4779MHz, f
RF2
= 5020MHz,
f
LO
= 5140MHz
RF = 4500MHz
RF = 4900MHz
RF = 5250MHz
f
RF
= 5020MHz at –10dBm, f
LO
= 5140MHz
f
IF
= 240MHz
f
RF
= 5060MHz at –10dBm, f
LO
= 5140MHz
f
IF
= 240MHz
RF = 4900MHz, V
CCIF
= 3.3V
RF = 4900MHz, V
CCIF
= 5V
MIN
TYP
8.0
7.7
7.3
±0.15
–0.005
24.2
25.1
24.0
39.8
10.7
11.0
11.7
–55
–75
11.3
14.5
MAX
UNITS
dB
Conversion Gain Flatness
Conversion Gain vs Temperature
2-Tone Input 3
rd
Order Intercept
(∆f = 2MHz)
2-Tone Input 2
nd
Order Intercept
(∆f = 241MHz, f
IM2
= f
RF2
– f
RF1
)
SSB Noise Figure
dB
dB/°C
dBm
dBm
dB
dBc
dBc
dBm
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
5544f
3
LTC5544
noted. Test circuit shown in Figure 1. (Note 2)
PARAMETER
Power Supply Requirements (V
CC
, V
CCIF
)
V
CC
Supply Voltage (Pins 5 and 7)
V
CCIF
Supply Voltage (Pins 14 and 15)
V
CC
Supply Current (Pins 5 + 7)
V
CCIF
Supply Current (Pins 14 + 15)
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
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
726.1
782.5
–1.73
–1.53
mV
mV
mV/°C
mV/°C
–0.3V to V
CC
+ 0.3V
–20
0.6
0.6
SHDN = High
3.0
0.3
30
Shutdown Logic Input (SHDN) Low = On, High = Off
V
V
µA
µs
µs
3.1
3.1
3.3
3.3
96
98
194
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
C
= 25°C, unless otherwise
MIN
TYP
MAX
UNITS
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 LTC5544 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, 6dB
matching pad on the LO input, bandpass filter on the IF output and no
other RF signals applied.
Typical Dc perForMance characTerisTics
V
CC
Supply Current vs Supply
Voltage (Mixer and LO Buffer)
102
100
SUPPLY CURRENT (mA)
98
T
C
= 105°C
96
94
92
90
3.0
T
C
= –40°C
T
C
= 25°C
135
125
SUPPLY CURRENT (mA)
115
105
T
C
= 25°C
95
85
75
3.0
T
C
= –40°C
T
C
= 105°C
T
C
= 85°C
SHDN = Low, Test circuit shown in Figure 1.
V
CCIF
Supply Current
vs Supply Voltage (IF Amplifier)
220
Total Supply Current
vs Temperature (V
CC
+ V
CCIF
)
SUPPLY CURRENT (mA)
T
C
= 85°C
210
V
CC
= 3.3V, V
CCIF
= 5V
(DUAL SUPPLY)
200
V
CC
= V
CCIF
= 3.3V
(SINGLE SUPPLY)
190
180
3.1
3.2
3.3
3.4
3.5
V
CC
SUPPLY VOLTAGE (V)
3.6
5544 G01
3.3
3.6 3.9 4.2 4.5 4.8 5.1 5.4
V
CCIF
SUPPLY VOLTAGE (V)
5544 G02
170
–40 –20
0
20 40 60 80
CASE TEMPERATURE (°C)
100 120
5544 G03
5544f
4
LTC5544
Low Side LO
V
CC
= 3.3V, V
CCIF
= 3.3V, SHDN = Low, T
C
= 25°C, P
LO
= 2dBm, P
RF
= –3dBm (–3dBm/tone for two-tone IIP3 tests,
∆
f = 2MHz),
IF = 240MHz, unless otherwise noted. Test circuit shown in Figure 1.
Conversion Gain and IIP3
vs RF Frequency
27
IIP3
15
Typical ac perForMance characTerisTics
Conversion Gain and IIP3
vs RF Frequency
27
IIP3
V
CC
= V
CCIF
V
CC
= 3.1V
V
CC
= 3.3V
V
CC
= 3.5V
G
C
15
25
23
13
P
LO
= –1dBm
P
LO
= 2dBm 11
P
LO
= 5dBm
25
23
13
IIP3 (dBm)
IIP3 (dBm)
11
G
C
(dB)
G
C
(dB)
21
19
G
C
9
21
19
9
7
7
5
17
4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0
RF FREQUENCY (GHz)
5544 G04
5
17
4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0
RF FREQUENCY (GHz)
5544 G05
Conversion Gain and IIP3
vs RF Frequency
27
IIP3
15
16
15
INPUT P1dB (dBm)
14
13
12
11
10
Input P1dB vs RF Frequency
25
23
13
V
CCIF
= 5V
21
19
G
C
T
C
= –40°C 11
T
C
= 25°C
T
C
= 85°C
T
C
= 105°C 9
7
IIP3 (dBm)
G
C
(dB)
V
CCIF
= 3.3V
P
LO
= –1dBm
P
LO
= 2dBm
P
LO
= 5dBm
5
17
4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0
RF FREQUENCY (GHz)
5544 G06
9
4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0
RF FREQUENCY (GHz)
5544 G07
SSB NF and DSB NF
vs RF Frequency
16
14
SSB NF DSB NF (dB)
,
12
G
C
(dB), IIP3 (dBm)
10
8
6
4
2
T
C
= –40°C
T
C
= 25°C
T
C
= 85°C
T
C
= 105°C
DSB NF
SSB NF
28
26
24
22
20
18
16
14
12
10
8
6
5250MHz Conversion Gain,
IIP3 and NF vs LO Power
IIP3
22
20
18
16
NF
14
12
10
T
C
= –40°C 8
T
C
= 25°C 6
T
C
= 85°C
4
2
6
7
0
SSB NF (dB)
G
C
–3 –2 –1
0
4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0
RF FREQUENCY (GHz)
5544 G08
0 1 2 3 4 5
LO INPUT POWER (dBm)
5544 G09
5544f
5
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