LTC5553
3GHz to 20GHz
Microwave Mixer
Features
Description
Upconversion or Downconversion
nn High IIP3: +24.3dBm at 10GHz
+21.5dBm at 17GHz
nn 9dB Conversion Loss at 10GHz
nn +16dBm Input P1dB at 10GHz
nn Integrated LO Buffer: 0dBm LO Drive
nn Low LO-RF Leakage: 9
dB
LO Input Return Loss
ZO = 50Ω, 1GHz to 20GHz
>10
dB
LO Input Power
–6
0
6
dBm
Downmixer Application, IF = 1890MHz, Low Side LO
8.2
9.0
11.3
11.6
dB
dB
dB
dB
0.006
dB/°C
RF Input = 4GHz
RF Input = 10GHz
RF Input = 14GHz
RF Input = 17GHz
27.6
24.3
23.9
21.5
dBm
dBm
dBm
dBm
SSB Noise Figure
RF Input = 10GHz
RF Input = 15.7GHz
10.9
12.8
dB
dB
LO to RF Leakage
fLO = 1GHz to 20GHz
32
dB
Input 1dB Compression
RF Input = 10GHz
16
dBm
Conversion Loss
RF Input = 4GHz
RF Input = 10GHz
RF Input = 14GHz
RF Input = 17GHz
Conversion Loss vs Temperature
TC = –40°C to 105°C, RF Input = 9.8GHz
2-Tone Input 3rd Order Intercept
(ΔfRF = 2MHz)
l
Upmixer Application, IF = 1890MHz, Low Side LO
Conversion Loss
RF Output = 4GHz
RF Output = 10GHz
RF Output = 14GHz
RF Output = 17GHz
8.3
9.3
11.9
11.5
dB
dB
dB
dB
Conversion Loss vs Temperature
TC = –40°C to 105°C, RF Output = 5.8GHz
0.006
dB/°C
2-Tone Input 3rd Order Intercept
(ΔfIF = 2MHz)
RF Output = 4GHz
RF Output = 10GHz
RF Output = 14GHz
RF Output = 17GHz
27.2
25.6
21.2
17.3
dBm
dBm
dBm
dBm
SSB Noise Figure
RF Output = 10GHz
RF Output = 15.7GHz
10.1
12.1
dB
dB
LO to RF Output Leakage
fLO = 1GHz to 20GHz
40
dB
Input 1dB Compression
RF Output = 10GHz
14.8
dBm
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 LTC5553 is guaranteed functional over the –40°C to 105°C
case temperature range (θJC = 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.
5553f
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3
LTC5553
Typical Performance Characteristics
140
140
130
130
120
120
110
100
90
80
70
60
–40 –20
Supply Current vs VCC
150
ICC (mA)
ICC (mA)
150
Supply Current vs Case
Temperature
EN = high, test circuit shown in Figure 1.
110
100
90
VCC = 3.0V
VCC = 3.3V
VCC = 3.6V
0
20 40 60 80 100 120
CASE TEMPERATURE (°C)
–40°C
25°C
85°C
105°C
80
70
60
3
3.1
5553 G01
4
3.2
3.3
3.4
SUPPLY VOLTAGE (V)
3.5
3.6
5553 G02
5553f
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LTC5553
Typical Performance Characteristics
3GHz to 20GHz downmixer application.
VCC = 3.3V, EN = high, TC = 25°C, PLO = 0dBm, PRF = –6dBm (–6dBm/tone for two-tone IIP3 tests, Δf = 2MHz), IF = 1890MHz, unless
otherwise noted. Test circuit shown in Figure 1.
Conversion Loss and IIP3 vs
RF Frequency (Low Side LO)
27
–40°C
25°C
85°C
105°C
IIP3
25
23
21
19
17
15
13
CONVERSION LOSS
11
9
7
3
5
7
9 11 13 15 17
RF FREQUENCY (GHz)
19
29
CONVERSION LOSS (dB), IIP3 (dBm)
CONVERSION LOSS (dB), IIP3 (dBm)
29
Conversion Loss and IIP3 vs
RF Frequency (High Side LO)
25
IIP3
23
21
19
17
15
13
11
CONVERSION LOSS
9
7
21
–40°C
25°C
85°C
105°C
27
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
RF FREQUENCY (GHz)
5553 G03
5553 G04
Conversion Loss and IIP3 vs
RF Frequency (High Side LO)
Conversion Loss and IIP3 vs
RF Frequency (Low Side LO)
28
IIP3
26
28
LO = –6dBm
LO = 0dBm
LO = 6dBm
CONVERSION LOSS (dB), IIP3 (dBm)
CONVERSION LOSS (dB), IIP3 (dBm)
30
24
22
20
18
16
14
12
10
8
CONVERSION LOSS
3
5
7
9 11 13 15 17
RF FREQUENCY (GHz)
19
24
LO = –6dBm
LO = 0dBm
LO = 6dBm
22
20
18
16
14
12
10
8
21
IIP3
26
CONVERSION LOSS
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
RF FREQUENCY (GHz)
5553 G05
5553 G06
Conversion Loss and IIP3
vs RF Frequency (Low Side LO)
27
IIP3
25
VCC = 3.0V
VCC = 3.3V
VCC = 3.6V
23
21
19
17
15
13
11
9
7
CONVERSION LOSS
3
5
7
9 11 13 15 17
RF FREQUENCY (GHz)
19
21
28
CONVERSION LOSS (dB), IIP3 (dBm)
CONVERSION LOSS (dB), IIP3 (dBm)
29
Conversion Loss and IIP3 vs
RF Frequency (High Side LO)
26
IIP3
24
VCC = 3.0V
VCC = 3.3V
VCC = 3.6V
22
20
18
16
14
12
10
8
CONVERSION LOSS
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
RF FREQUENCY (GHz)
5553 G07
5553 G08
5553f
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5
LTC5553
Typical
Performance Characteristics
3GHz to 20GHz downmixer application.
VCC = 3.3V, EN = high, TC = 25°C, PLO = 0dBm, PRF = –6dBm (–6dBm/tone for two-tone IIP3 tests, Δf = 2MHz), IF = 1890MHz, unless
otherwise noted. Test circuit shown in Figure 1.
Conversion Loss and IIP3 vs IF
Frequency (Low Side LO)
Input P1dB vs RF Frequency
17
26
24
22
20
RF = 9.8 GHz, LS LO
RF = 15.8GHz, LS LO
RF = 3.8GHz, HS LO
18
16
14
CONVERSION LOSS
12
15
14
13
12
11
10
8
LS LO
HS LO
16
IIP3
INPUT P1dB (dBm)
CONVERSION LOSS (dB), IIP3 (dBm)
28
0
1
2
3 4 5 6 7
IF FREQUENCY (GHz)
8
9
10
10
3
5
7
9 11 13 15 17
RF FREQUENCY (GHz)
5553 G09
RF Isolation
70
–10
60
RF ISOLATION (dB)
LO LEAKAGE (dBm)
LO Leakage
–20
–30
–40
–60
3
5
50
40
30
20
RF – LO
RF – IF (LS LO)
RF – IF (HS LO)
10
LO – IF
LO – RF
1
0
7 9 11 13 15 17 19 21
LO FREQUENCY (GHz)
1
3
5
7 9 11 13 15 17 19 21
RF FREQUENCY (GHz)
5553 G11
35
5553 G12
9.8GHz Conversion Loss
Histogram
45
85°C
25°C
–40°C
25
20
15
10
9.8GHz IIP3 Histogram
40
35
DISTRIBUTION (%)
DISTRIBUTION (%)
30
85°C
25°C
–40°C
30
25
20
15
10
5
5
0
9.8 9.6 9.4 9.2 9.0 8.8 8.6 8.4 8.2 8.0
CONVERSION LOSS (dB)
0
23.1 23.4 23.7 24.0 24.3 24.6 24.9 25.2 25.5 25.8 26.1
IIP3 (dBm)
5553 G13
6
21
5553 G10
0
–50
19
5553 G14
5553f
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LTC5553
Typical
Performance Characteristics
3GHz to 20GHz upmixer application.
VCC = 3.3V, EN = high, TC = 25°C, PLO = 0dBm, PIF = –6dBm (–6dBm/tone for two-tone IIP3 tests, Δf = 2MHz), IF = 1890MHz, unless
otherwise noted. Test circuit shown in Figure 1.
Conversion Loss and IIP3
vs RF Frequency (Low Side LO)
–40°C
25°C
85°C
105°C
IIP3
25
23
21
19
17
15
13
11
CONVERSION LOSS
9
7
3
5
7
9 11 13 15 17
RF FREQUENCY (GHz)
19
29
25
23
IIP3
21
19
17
15
13
11
CONVERSION LOSS
9
7
21
3
5
7
5553 G15
21
19
IIP3
17
15
13
11
CONVERSION LOSS
9
7
27
CONVERSION LOSS (dB), IIP3 (dBm)
CONVERSION LOSS (dB), IIP3 (dBm)
23
23
CONVERSION LOSS
14
12
17
15
13
11
9
CONVERSION LOSS
0
1
2
3 4 5 6 7
IF FREQUENCY (GHz)
8
11
9
10
5553 G21
CONVERSION LOSS
9
3
5
7
9 11 13 15 17
RF FREQUENCY (GHz)
19
22
IIP3
20
18
16
14
12
10
CONVERSION LOSS
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
RF FREQUENCY (GHz)
5553 G20
IF Isolation
17
80
16
70
15
14
13
12
10
1
2
3
4
5
6
7
IF FREQUENCY (GHz)
8
60
50
40
30
LS LO
HS LO
0
21
VCC = 3.0V
VCC = 3.3V
VCC = 3.6V
24
8
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
RF FREQUENCY (GHz)
11
10
8
13
5553 G17
IF ISOLATION (dB)
RF = 9.8GHz, LS LO
RF = 15.8GHz, LS LO
RF = 3.8GHz, HS LO
INPUT P1dB (dBm)
CONVERSION LOSS (dB), IIP3 (dBm)
26
16
15
Input P1dB vs IF Frequency
28
18
17
5553 G19
30
IIP3
IIP3
19
26
19
Conversion Loss and IIP3
vs IF Frequency (Low Side LO)
20
21
Conversion Loss and IIP3
vs RF Frequency (High Side LO)
IIP3
21
5553 G18
22
23
7
21
LO = –6dBm
LO = 0dBm
LO = 6dBm
25
7
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
RF FREQUENCY (GHz)
24
19
25
Conversion Loss and IIP3
vs RF Frequency (High Side LO)
–40°C
25°C
85°C
105°C
25
9 11 13 15 17
RF FREQUENCY (GHz)
VCC = 3.0V
VCC = 3.3V
VCC = 3.6V
27
5553 G16
Conversion Loss and IIP3 vs
RF Frequency (High Side LO)
27
29
LO = –6dBm
LO = 0dBm
LO = 6dBm
27
CONVERSION LOSS (dB), IIP3 (dBm)
27
CONVERSION LOSS (dB), IIP3 (dBm)
CONVERSION LOSS (dB), IIP3 (dBm)
29
Conversion Loss and IIP3
vs RF Frequency (Low Side LO)
CONVERSION LOSS (dB), IIP3 (dBm)
Conversion Loss and IIP3 vs
RF Frequency (Low Side LO)
9
5553 G22
20
IF – RF
IF – LO
0
1
2
3
4
5
6
7
IF FREQUENCY (GHz)
8
9
5553 G23
5553f
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7
LTC5553
Pin Functions
GND (Pins 1, 3, 4, 6, 8, 10, 12, Exposed Pad Pin 13):
Ground. These pins must be soldered to the RF ground
on the circuit board. The exposed pad metal of the package provides both electrical contact to ground and good
thermal contact to the printed circuit board.
IF (Pin 2): Single-Ended Terminal for the IF Port. This pin
is internally connected to the primary side of the IF transformer, which has low DC resistance to ground. A series
DC blocking capacitor should be used to avoid damage
to the integrated transformer if DC voltage is present. The
IF port is impedance matched from 500MHz to 9GHz, as
long as the LO is driven with a 0 ±6dBm source between
1GHz and 20GHz.
RF (Pin 5): Single-Ended Terminal for the RF Port. This
pin is internally connected to the primary side of the RF
transformer, which has low DC resistance to ground. A
series DC blocking capacitor must be used to avoid damage
to the integrated transformer if DC voltage is present. The
RF port is impedance matched from 3GHz to 20GHz as
long as the LO is driven with a 0 ±6dBm source between
1GHz and 20GHz.
EN (Pin 7): Enable Pin. When the voltage applied to this
pin is greater than 1.2V, the mixer is enabled. When the
voltage is less than 0.3V, the mixer is disabled. Typical
input current is less than 30μA. This pin has an internal
376kΩ pull-down resistor.
VCC (Pin 9): Power Supply Pin. This pin must be externally
connected to a regulated 3.3V supply, with a bypass capacitor located close to the pin. Typical current consumption
is 132mA when the part is enabled.
LO (Pin 11): Input for the Local Oscillator (LO). A series
DC blocking capacitor must be used. Typical DC voltage
at this pin is 1.6V.
Block Diagram
2
LTC5553
IF
5
LO
AMP
RF
11
LO
MIXER
CORE
REF/BIAS
7
EN
9
VCC
GND PINS ARE NOT SHOWN.
8
5553 BD
5553f
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LTC5553
Test Circuit
IF
50Ω
3
2
1
GND
IF
GND
4 GND
LTC5553
GND 12
C1
RF
50Ω
13
GND
5 RF
6 GND
LO
50Ω
LO 11
GND 10
EN
GND
VCC
7
8
9
VCC
(3.0V TO 3.6V)
EN
C2
C3
5553 F01
REF DES
VALUE
SIZE
VENDOR
COMMENT
C1
18pF
0402
AVX
0402ZK180GBS
C2
18pF
0402
Murata
GJM1555C1H180FB01
C3
1µF
0603
Murata
GRM188R71A105KA61
* Standard Evaluation Board Configuration
Figure 1. Standard Test Circuit Schematic
5553f
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9
LTC5553
Applications Information
Introduction
The LTC5553 consists of a high linearity double-balanced
mixer core, LO buffer amplifier and bias/enable circuits.
See the Block Diagram section for a description of each pin
function. The RF, LO and IF are single-ended 50Ω ports. The
LTC5553 can be used as a frequency downconverter where
the RF is used as an input and IF is used as an output. It can
also be used as a frequency upconverter where the IF is used
as an input and RF is used as an output. Low side or high
side LO injection can be used. The evaluation circuit and the
evaluation board layout are shown in Figure 1 and Figure 2,
respectively.
the DC resistance of the primary side is approximately
2.5Ω. A DC blocking capacitor is needed if the RF source
has DC voltage present. The secondary winding of the
RF transformer is internally connected to the mixer core.
The RF port is internally broadband matched from 3GHz
to 20GHz. A 0.15pF shunt capacitor located 1.4mm away
from the RF pin can be used to improve the RF port
matching between the 13GHz to 15GHz frequency range.
LO power between –6dBm and 6dBm is required for good
RF impedance matching. The measured RF input return
loss is shown in Figure 4 for IF frequencies of 900MHz,
2GHz and 4GHz with low side LO.
0
IF = 900MHz
IF = 2GHz
IF = 4GHz
RETURN LOSS (dB)
5
10
15
20
25
30
3
5
7
9 11 13 15 17
RF FREQUENCY (GHz)
19
21
5553 F04a
(a) No Matching
0
IF = 900MHz
IF = 2GHz
IF = 4GHz
5
RF Port
The mixer’s RF port, shown in Figure 3, is connected to the
primary winding of an integrated transformer. The primary
side of the RF transformer is DC–grounded internally and
RETURN LOSS (dB)
Figure 2. Evaluation Board Layout
10
15
20
25
30
LTC5553
3
5
7
9
11
13
RF FREQUENCY (GHz)
15
17
5553 F04b
RF
50Ω
5
(b) With Shunt 0.15pF at 1.4mm
RF
Figure 4. RF Port Return Loss
ZO = 50Ω
L = 1.4mm
5553 F03
Figure 3. Simplified RF Port Interface Schematic
10
5553f
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LTC5553
Applications Information
The RF input impedance and input reflection coefficient
versus RF frequency is listed in Table 1. The reference plane
for this data is Pin 5 of the IC, with no external matching,
and the LO is driven at 12GHz.
LTC5553
C1
LO
Table 1. RF Port Impedance and S11
(at Pin 5, No External Matching, LO Input Driven at 12GHz)
LO
11
S11
FREQUENCY
(GHz)
RF IMPEDANCE
MAG
ANGLE
3
62.7 + j40.8
0.36
52.8
4
69.5 + j7.7
0.18
17.9
5
55.7 + j2.4
0.06
21.3
6
55.4 + j10.1
0.11
56.3
7
53.5 + j2.6
0.04
35.3
8
54.1 – j1.7
0.04
–21.8
9
52.7 – j7.3
0.08
–65.8
10
48.4 – j10.4
0.11
–92.5
11
46.6 – j14.8
0.16
–94.2
12
29.4 – j40.8
0.51
–89.6
13
28.7 – j15.6
0.33
–132.5
14
25.6 – j17.7
0.39
–130.8
0
15
26.0 – j15.4
0.37
–135.9
5
16
26.2 – j7.6
0.33
–156.5
17
25.4 + j5.2
0.33
164.3
18
21.6 + j14.8
0.44
140.8
19
19.8 + j18.9
0.49
132.9
20
19.6 + j17.2
0.49
136.5
5553 F05
Figure 5. Simplified LO Input Schematic
RETURN LOSS (dB)
The LO is 50Ω matched from 1GHz to 20GHz. External
matching components may be needed for extended LO
operating frequency range. The measured LO input return
loss is shown in Figure 6. The nominal LO input level is
0dBm, although the limiting amplifiers will deliver excellent
performance over a ±6dBm input power range.
10
15
20
25
LO Input
30
The mixer’s LO input, shown in Figure 5, consists of a
single-ended to differential conversion and high speed
limiting differential amplifier. The LO amplifier is optimized
for the 1GHz to 20GHz LO frequency range. LO frequencies
above or below this frequency range may be used with
degraded performance.
35
The DC voltage at the LO input is about 1.6V. A DC blocking capacitor (C1) is required.
EN = HIGH
EN = LOW
1
3
5
7 9 11 13 15 17 19 21
LO FREQUENCY (GHz)
5553 F06
Figure 6. LO Input Return Loss
The LO input impedance and input reflection coefficient
versus frequency, is shown in Table 2.
5553f
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11
LTC5553
Applications Information
Table 2. LO Input Impedance vs Frequency
(at Pin 11, No External Matching with C1 = 18pF Connected)
The measured IF port return loss is shown in Figure 8.
0
S11
INPUT
IMPEDANCE
MAG
ANGLE
1
56.6 – j16.2
0.16
–59.1
2
54.1 – j9.2
0.10
–60.9
3
52.4 – j6.4
0.07
–65.6
4
50.4 – j5.0
0.05
–82.1
5
48.7 – j5.9
0.06
–99.1
6
46.7 – j9.5
0.10
–103.6
7
44.4 – j13.3
0.15
–104.8
8
41.4 – j17.2
0.21
–105.8
9
39.0 – j20.2
0.25
–105.8
10
38.7 – j25.9
0.31
–97.3
11
40.8 – j30.3
0.33
–88.5
12
49.2 – j34.7
0.33
–72.1
5
RETURN LOSS (dB)
FREQUENCY
(GHz)
10
15
20
25
0.5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5
IF FREQUENCY (GHz)
5553 F08
Figure 8. IF Port Return Loss
The IF port impedance and input reflection coefficient
versus frequency are shown in Table 3.
13
58.2 – j26.8
0.25
–59.1
14
55.9 – j11.6
0.12
–57.0
15
40.9 – j5.2
0.12
–146.9
16
29.1 – j8.4
0.28
–152.1
17
24.1 – j13.5
0.39
–142.1
FREQUENCY
(GHz)
IF IMPEDANCE
MAG
ANGLE
18
25.2 – j16.8
0.39
–133.3
0.5
16.0 + j30.4
0.63
113.4
19
27.8 – j14.1
0.33
–137.2
1.0
58.3 + j36.2
0.33
58.6
20
24.1 – j7.6
0.36
–157.8
IF Port
The mixer’s IF port, shown in Figure 7, is connected to the
primary winding of an integrated transformer. The primary
side of the IF transformer is DC-grounded internally and
the DC resistance is approximately 6.2Ω. A DC blocking
capacitor is needed if the IF source has DC voltage present.
The secondary winding of the IF transformer is internally
connected to the mixer core.
LTC5553
IF
2
IF
5553 F07
Figure 7. Simplified IF Port Schematic
12
Table 3. IF Port Impedance vs Frequency
(at Pin 2, No External Matching)
S11
1.5
66.5 – j6.3
0.15
–17.7
2.0
45.5 – j16.8
0.18
95.0
2.5
36.2 – j14.2
0.23
–124.7
3.0
32.9 – j11.3
0.24
–138.6
3.5
32.1 – j7.2
0.23
–152.9
4.0
31.6 – j2.3
0.23
–171.4
4.5
31.1 + j2.4
0.23
171.2
5.0
31.8 + j7.3
0.24
152.9
5.5
31.7 + j10.3
0.25
143.3
6.0
32.5 + j12.7
0.26
135.3
6.5
29.6 + j10.8
0.29
144.5
7.0
27.8 + j9.0
0.31
151.3
7.5
25.6 + j6.8
0.33
159.2
8.0
23.4 + j5.0
0.37
165.6
8.5
22.8 + j4.8
0.38
166.2
9.0
24.6 + j5.8
0.35
162.8
9.5
30.5 + j8.6
0.26
150.0
10.0
42.7 + j15.3
0.18
106.2
5553f
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LTC5553
Applications Information
Enable Interface
Supply Voltage Ramping
Figure 9 shows a simplified schematic of the EN pin
interface. To enable the chip, the EN voltage must be
higher than 1.2V. The voltage at the EN pin should never
exceed VCC by more than 0.3V. If this should occur, the
supply current could be sourced through the ESD diode,
potentially damaging the IC. If the EN pin is left floating,
its voltage will be pulled low by the internal pull-down
resistor and the chip will be disabled.
Fast ramping of the supply voltage can cause a current
glitch in the internal ESD protection circuits. Depending on
the supply inductance, this could result in a supply voltage transient that exceeds the maximum rating. A supply
voltage ramp time of greater than 1ms is recommended.
9
7
Spurious Output Levels
Mixer spurious output levels versus harmonics of the
RF and LO are tabulated in Table 4. The spur levels were
measured on a standard evaluation board using the test
circuit shown in Figure 1. The spur frequencies can be
calculated using the following equation:
LTC5553
VCC
EN
BIAS
Frequency Downconversion: fSPUR = (M • fRF)±(N • fLO)
Frequency Upconversion: fSPUR = (M • fIF)±(N • fLO)
5553 F09
Figure 9. Simplified Enable Input Circuit
Table 4a. Downconversion IF Output Spur Levels (dBc): fSPUR = (M • fRF) – (N • fLO)
RF = 5250MHz, PRF = –6dBm, PLO = 0dBm, LO = 4900MHz
N
0
0
M
1
2
3
4
5
–15
–11
–16
–5
–21
1
–48
0
–28
–13
–39
–27
2
–63
–55
–65
–61
–63
–58
3
–73
–73
< –75
–73
< –75
–69
4
*
–72
–72
< –75
–75
< –75
5
*
*
*
–73
–72
< –75
*Out of the test equipment range.
Table 4b. Upconversion RF Output Spur Levels (dBc): fSPUR = (M • fRF) + (N • fLO)
RF = 5835MHz, PIF = –6dBm, PLO = 0dBm, IF = 1890MHz, Low-Side LO, VCC = 3.3V, EN = High, TC = 25°C
N
0
0
M
1
2
3
4
8
–24
–15
–16
–20
–27
1
–51
0
–42
–13
–43
*
2
–58
–64
–58
–61
–62
*
3
< –75
–72
–72
–71
*
*
4
< –75
< –75
–73
–73
*
*
5
< –75
–73
–73
*
*
*
6
< –75
–73
–73
*
*
*
7
–72
–73
*
*
*
*
*Out of the test equipment range.
5553f
For more information www.linear.com/LTC5553
13
LTC5553
Applications Information
Evaluation Board Insertion Loss
The LTC5553 performance in the data sheet is measured
using the evaluation board shown in Figure 2. The insertion loss of the board traces and SMA connectors are
1.0
RF
LO
IF
0.9
0.8
INSERTION LOSS (dB)
not de-embedded. These insertion losses are shown in
Figure 10, and the actual performance of the LTC5553
can be estimated using this data. Figure 11 compares the
de-embedded performance to the performance measured
at the SMA connectors.
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1
3
5
7 9 11 13 15 17 19 21
FREQUENCY (GHz)
5553 F10
Figure 10. Insertion Loss of the RF, LO and IF ports
CONVERSION LOSS (dB), IIP3 (dBm)
29
27
IIP3
25
23
21
19
BOARD LOSS INCLUDED
BOARD LOSS DEEMBEDDED
17
15
13
CONVERSION LOSS
11
9
7
3
5
7
9 11 13 15 17
RF FREQUENCY (GHz)
19
21
5553 F11
Figure 11. Comparison of the LTC5553 Performance Before and After De-Embedding
the Insertion Loss of the Evaluation Board and SMA Connectors. Downconversion
Application with Low Side LO, IF = 1890MHz, VCC = 3.3V, EN = High, TC = 25ºC
14
5553f
For more information www.linear.com/LTC5553
LTC5553
Package Description
Please refer to http://www.linear.com/product/LTC5553#packaging for the most recent package drawings.
UDB Package
Variation A
12-LeadUDB
Plastic
QFN (3mm × 2mm)
Package
(Reference Variation:
LTC DWG # 05-08-1985
Rev Ø)
A
12-Lead Plastic QFN (3mm × 2mm)
(Reference LTC DWG # 05-08-1985 Rev Ø)
0.25 ±0.05
0.85 ±0.05
0.65 ±0.05
0.77 ±0.05
0.05 REF
2.50 ±0.05
DETAIL B
DETAIL B
0.25 ±0.10
PACKAGE
OUTLINE
0.25 ±0.05
0.50 BSC
0.75 ±0.05
0.77 ±0.10
0.05 REF
DETAIL A
3.50 ±0.05
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
R = 0.13
TYP
10
12
0.15 REF
0.60 ±0.10
0.40 ±0.10
9
1 0.40 REF
7
0.40 ±0.10
3
2.00 ±0.10
6
3.00 ±0.10
0.50 ±0.10
0.75 ±0.05
0.20 REF
DETAIL A
4
0.50 ±0.10
(UDB12) DFN 0814 REV 0
0.25 ±0.05
0.50 BSC
BOTTOM VIEW—EXPOSED PAD
SIDE VIEW
0.00 – 0.05
NOTE:
1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
5553f
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection
of its circuits
as described
herein will not infringe on existing patent rights.
For more
information
www.linear.com/LTC5553
15
LTC5553
Typical Application
Wideband Downconversion to 6GHz
Conversion Loss and IIP3 vs Input Frequency (Low Side LO)
29
7GHz to 16GHz
LTC5553
RF
C
CONVERSION LOSS (dB), IIP3 (dBm)
ZO = 50Ω
L = 1.4mm
6GHz
IF
LO
18pF
1GHz to 10GHz
5553 TA02a
C OPEN
C = 0.15pF
27
25
IIP3
23
21
19
17
15
CONVERSION LOSS
13
11
7
8
9
10 11 12 13 14
RF FREQUENCY (GHz)
15
16
5553 TA02b
Related Parts
PART NUMBER DESCRIPTION
COMMENTS
Mixers, Modulators and Demodulators
LTC5548
2GHz to 14GHz Microwave Mixer with
Wideband DC-6GHz IF
7.1dB Conversion Loss, 24dBm IIP3, 3.3V/120mA Supply
LTC5549
2GHz to 14GHz Microwave Mixer
8dB Conversion Loss, 24dBm IIP3, 500MHz to 6GHz Single-Ended IF with Integrated
Balun
LTC5544
4GHz to 6GHz Downconverting Mixer
7.5dB Gain, >25dBm IIP3 and 10dB NF, 3.3V/200mA Supply
LTC5576
3GHz to 8GHz High Linearity Active
Upconverting Mixer
25dBm OIP3, –0.6dB Gain, 14.1dB NF, –154dBm/Hz Output Noise Floor, –28dBm LO
Leakage at 8GHz
LTC5551
300MHz to 3.5GHz Ultrahigh Dynamic Range
Downconverting Mixer
+36dBm IIP3; 2.4dB Gain, 40dB LO-RF Isolation, 0dBm LO Drive
LTC5510
1MHz to 6GHz Wideband High Linearity Active
Mixer
50Ω Matched Input from 30MHz to 6GHz, 27dBm OIP3, 1.5dB Gain,
Up- or Down-Conversion
LTC5586
300MHz to 6GHz Ultra-Wideband Direct I/Q
Demodulator with IF Amplifier
I/Q Bandwidth DC to 1GHz, +30dBm IIP3, 80dBm OIP2, Image Rejection >60dB, DC
Offset Cancellation
LTC5588-1
6GHz I/Q Modulator
200MHz to 6GHz Direct Conversion, 31dBm OIP3 Adjustable to 34dBm, –160dBm/Hz
Output Noise Floor, Excellent ACPR
LTC6430-20
High Linearity Differential IF Amp
20MHz to 2GHz Bandwidth, 20.8dB Gain, 51dBm OIP3, 2.9dB NF at 240MHz
LTC6431-20
High Linearity Single-Ended IF Amp
20MHz to 1.4GHz Bandwidth, 20.8dB Gain, 46.2dBm OIP3, 2.6dB NF at 240MHz
Amplifiers
RF Power Detectors
LTC5564
15GHz Ultra Fast 7ns Response Time RF
Detector with Comparator
600MHz to 15GHz, –24dB to 16dBm Input Power Range, 9ns Comparator Response
Time, 125°C Version
LTC5582
40MHz to 10GHz RMS Detector
±0.5dB Accuracy Over Temperature, ±0.2dB Linearity Error, 57dB Dynamic Range
LTC5596
100MHz to 40GHz RMS Power Detector
35dB Dynamic Range (–37dBm to –2dBm), ±1dB Flatness from 200MHz to 30GHz
RF PLL/Synthesizer with VCO
LTC6948
16
Ultralow Noise, Low Spurious Frac-N PLL with
Integrated VCO
373MHz to 6.39GHz, –157dBc/Hz WB Phase Noise Floor, –274dBc/Hz Normalized
In-Band 1/f Noise
5553f
LT 0417 • PRINTED IN USA
For more information www.linear.com/LTC5553
www.linear.com/LTC5553
LINEAR TECHNOLOGY CORPORATION 2017
