LT5578
0.4GHz to 2.7GHz
High Linearity
Upconverting Mixer
FEATURES
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DESCRIPTION
The LT
®
5578 mixer is a high performance upconverting
mixer optimized for frequencies in the 0.4GHz to 2.7GHz
range. The single-ended LO input and RF output ports
simplify board layout and reduce system cost. The mixer
needs only –1dBm of LO power and the balanced design
results in low LO signal leakage to the RF output. At
1.95GHz operation, the LT5578 provides conversion gain
of –0.7dB, high OIP3 of 24.3dBm and a low noise floor of
–158dBm/Hz at a –5dBm RF output signal level.
The LT5578 offers a high performance alternative to pas-
sive mixers. Unlike passive mixers, which have conversion
loss and require high LO drive levels, the LT5578 delivers
conversion gain at significantly lower LO input levels and
is less sensitive to LO power level variations. The lower
LO drive level requirements, combined with the excellent
LO leakage performance, translate into lower LO signal
contamination of the output signal.
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.
High Output IP3: 27dBm at 0.9GHz
24.3dBm at 1.95GHz
Low Noise Floor: –158dBm/Hz (P
OUT
= –5dBm)
High Conversion Gain: 1.4dB at 0.9GHz
Noise Figure: 8.6dB
Low LO-RF Leakage: –43dBm
Single-Ended RF and LO Ports
Low LO Drive Level: –1dBm
Single 3.3V Supply
5mm
×
5mm QFN24 Package
(Pin Compatible with LT5579)
APPLICATIONS
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GSM 900PCS/1800PCS and W-CDMA Infrastructure
LTE and WiMAX Basestations
Wireless Repeaters
Public Safety Radios
TYPICAL APPLICATION
Frequency Upconversion in LTE Transmitter
LO INPUT
–1dBm
2.7pF
6.8pF
30
LT5578
LO
GND
13.7Ω
IF
140MHz
100nH
IF
39pF
+
Gain, NF and OIP3 vs
RF Output Frequency
OIP3
GAIN (dB), NF (dB), OIP3 (dBm)
25
20
15
10
5
GAIN
0
650 700 750 800 850 900 950 1000
RF OUTPUT FREQUENCY (MHz)
5578 TA01b
BIAS
RF
700MHz
13nH TO 950MHz
2.7pF
TC4-1W+
220pF
4:1
T
A
= 25°C
f
IF
= 140MHz
f
LO
= f
RF
– f
IF
RF
22nH
2pF
SSB NF
IF
–
220pF
100nH
V
CC
10μF
100μF
5579 TA01a
13.7Ω
1nF
V
CC
3.3V
5578f
1
LT5578
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
GND
GND
GND
GND
GND
18 GND
17 GND
25
16 GND
15 RF
14 GND
13 GND
7
GND
8
V
CC
9 10 11 12
GND
V
CC
V
CC
V
CC
LO
24 23 22 21 20 19
GND 1
GND 2
IF
+
Supply Voltage ............................................................4V
LO Input Power ....................................................10dBm
LO Input DC Current ..............................................30mA
RF Output DC Current ............................................45mA
IF Input Power (Differential).................................18dBm
IF
+
, IF
–
DC Currents ...............................................45mA
T
JMAX
.................................................................... 150°C
Operating Temperature Range.................. –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
3
4
IF
–
GND 5
GND 6
UH PACKAGE
24-LEAD (5mm 5mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 34°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT5578IUH#PBF
TAPE AND REEL
LT5578IUH#TRPBF
PART MARKING
5578
PACKAGE DESCRIPTION
24-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/
DC ELECTRICAL CHARACTERISTICS
PARAMETER
Power Supply Requirements (V
CC
)
Supply Voltage
Supply Current
Input Common Mode Voltage (V
CM
)
CONDITIONS
V
CC
= 3.3V, T
A
= 25°C (Note 3), unless otherwise noted.
MIN
3.1
TYP
3.3
152
159
565
MAX
3.5
170
UNITS
V
DC
mA
mA
mV
V
CC
= 3.3V, P
LO
= –1dBm
V
CC
= 3.5V, P
LO
= –1dBm
Internally Regulated
AC ELECTRICAL CHARACTERISTICS
PARAMETER
IF Input Frequency Range (Note 4)
LO Input Frequency Range (Note 4)
RF Output Frequency Range (Note 4)
CONDITIONS
Requires Matching
(Notes 2, 3)
MIN
TYP
LF to 600
400 to 3000
400 to 2700
MAX
UNITS
MHz
MHz
MHz
Requires Matching Below 1.5GHz
Requires Matching
5578f
2
LT5578
AC ELECTRICAL CHARACTERISTICS
V
CC
= 3.3V, T
A
= 25°C, Test circuits are shown in Figure 1. (Notes 2, 3)
PARAMETER
IF Input Return Loss
LO Input Return Loss
RF Output Return Loss
LO Input Power
CONDITIONS
Z
O
= 50Ω, External Match
Z
O
= 50Ω, External Match
Z
O
= 50Ω, External Match
MIN
TYP
15
>9
>10
–5 to 2
MAX
UNITS
dB
dB
dB
dBm
V
CC
= 3.3V, T
A
= 25°C, P
IF
= –5dBm (–5dBm/tone for 2-tone tests,
Δf
= 1MHz), P
LO
= –1dBm, unless otherwise noted.
Low side LO for 900MHz. High side LO for 740MHz and 1950MHz. (Notes 2, 3, 4)
PARAMETER
Conversion Gain
CONDITIONS
f
RF
= 740MHz, f
IF
= 140MHz
f
RF
= 900MHz, f
IF
= 140MHz
f
RF
= 1950MHz, f
IF
= 240MHz
f
RF
= 740MHz, f
IF
= 140MHz
f
RF
= 900MHz, f
IF
= 140MHz
f
RF
= 1950MHz, f
IF
= 240MHz
f
RF
= 740MHz, f
IF
= 140MHz
f
RF
= 900MHz, f
IF
= 140MHz
f
RF
= 1950MHz, f
IF
= 240MHz
f
RF
= 740MHz, f
IF
= 140MHz
f
RF
= 900MHz, f
IF
= 140MHz
f
RF
= 1950MHz, f
IF
= 240MHz
f
RF
= 740MHz, f
IF
= 140MHz
f
RF
= 900MHz, f
IF
= 140MHz
f
RF
= 1950MHz, f
IF
= 240MHz
f
RF
= 740MHz, f
IF
= 140MHz
f
RF
= 900MHz, f
IF
= 140MHz
f
RF
= 1950MHz, f
IF
= 240MHz
f
RF
= 740MHz, f
IF
= 140MHz
f
RF
= 900MHz, f
IF
= 140MHz
f
RF
= 1950MHz, f
IF
= 240MHz
f
RF
= 740MHz, f
IF
= 140MHz
f
RF
= 900MHz, f
IF
= 140MHz
f
RF
= 1950MHz, f
IF
= 240MHz
f
RF
= 740MHz, f
IF
= 140MHz
f
RF
= 900MHz, f
IF
= 140MHz
f
RF
= 1950MHz, f
IF
= 240MHz
f
RF
= 740MHz, f
IF
= 140MHz
f
RF
= 900MHz, f
IF
= 140MHz
f
RF
= 1950MHz, f
IF
= 240MHz
f
RF
= 740MHz, f
IF
= 140MHz
f
RF
= 900MHz, f
IF
= 140MHz
f
RF
= 1950MHz, f
IF
= 240MHz
f
RF
= 740MHz, f
IF
= 140MHz
f
RF
= 900MHz, f
IF
= 140MHz
f
RF
= 1950MHz, f
IF
= 240MHz
MIN
TYP
0.8
1.4
–0.7
–0.020
–0.018
–0.021
26.5
27.0
24.3
62
52
58
8.6
8.6
10.5
–161
–160.5
–158
–158
–157.5
–154
–154
–153
–149.5
11.6
12
10
80
75
60
–31
–40
–22
–43
–43
–46
MAX
UNITS
dB
dB
dB
dB/°C
dB/°C
dB/°C
dBm
dBm
dBm
dBm
dBm
dBm
dB
dB
dB
dBm/Hz
dBm/Hz
dBm/Hz
dBm/Hz
dBm/Hz
dBm/Hz
dBm/Hz
dBm/Hz
dBm/Hz
dBm
dBm
dBm
dB
dB
dB
dBm
dBm
dBm
dBm
dBm
dBm
Conversion Gain vs Temperature
(T
A
= –40°C to 85°C)
Output 3rd Order Intercept
Output 2nd Order Intercept (LO ±2IF)
Single Sideband Noise Figure
Output Noise: P
OUT
= –5dBm
Output Noise: P
OUT
= 0dBm
Output Noise: P
OUT
= 5dBm
Output 1dB Compression
IF to LO Isolation
LO to IF Leakage
LO to RF Leakage
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:
Each set of frequency conditions requires appropriate matching
(see Figure 1).
Note 3:
The LT5578 is guaranteed functional over the operating
temperature range from –40°C to 85°C.
Note 4:
SSB noise figure measurements performed with a small-signal
noise source and bandpass filter on LO signal generator. No other IF signal
applied.
5578f
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LT5578
TYPICAL DC PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
180
170
SUPPLY CURRENT (mA)
160
150
140
130
120
85°C
25°C
–40°C
3.0
3.1
3.2
3.3
3.4
SUPPLY VOLTAGE (V)
3.5
3.6
5578 G01
(Test Circuit Shown in Figure 1)
TYPICAL AC PERFORMANCE CHARACTERISTICS
900MHz Application:
V
CC
= 3.3V, T
A
= 25°C, f
IF
= 140MHz, P
IF
= –5dBm (–5dBm/tone for 2-tone tests, Δf = 1MHz), low side LO, P
LO
= –1dBm,
output measured at 900MHz, unless otherwise noted. (Test circuit shown in Figure 1)
SSB Noise Figure Distribution at
900MHz
60
50
DISTRIBUTION (%)
40
30
20
10
0
6
7
8
9
NOISE FIGURE (dB)
10
11
5578 G04
Gain Distribution at 900MHz
45
40
35
DISTRIBUTION (%)
30
25
20
15
10
5
0
–0.5
0
0.5
1.0 1.5 2.0
GAIN (dB)
2.5
3.0 3.5
5578 G02
OIP3 Distribution at 900MHz
25
T
A
= 90°C
T
A
= 25°C
T
A
= –45°C
T
A
= 90°C
T
A
= 25°C
T
A
= –45°C
DISTRIBUTION (%)
20
T
A
= 90°C
T
A
= 25°C
T
A
= –45°C
15
10
5
0
23
24
25
26
27
OIP3 (dBm)
28
29
5578 G03
5578f
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LT5578
TYPICAL AC PERFORMANCE CHARACTERISTICS
Conversion Gain and OIP3
vs RF Output Frequency
16
OIP3
12
26
LO LEAKAGE (dBm)
85°C
25°C
–40°C
700
720 740 760
RF FREQUENCY (MHz)
780
800
NOISE FIGURE (dB)
14
12
10
8
6
4
–4
660
680
700 720 740 760
RF FREQUENCY (MHz)
780
10
800
2
660 680
–50
–60
660
85°C
25°C
–40°C
680
700 720 740 760
RF FREQUENCY (MHz)
780
800
30
18
16
740MHz Application:
V
CC
= 3.3V, T
A
= 25°C, f
IF
= 140MHz, P
IF
= –5dBm (–5dBm/tone for 2-tone tests, Δf = 1MHz), high side LO, P
LO
= –1dBm,
output measured at 740MHz, unless otherwise noted. (Test circuit shown in Figure 1)
SSB Noise Figure
vs RF Output Frequency
0
–10
–20
–30
–40
LO-RF Leakage
vs RF Output Frequency
OIP3 (dBm)
GAIN (dB)
8
4
GAIN
0
85°C
25°C
–40°C
22
18
14
5578 G05
5578 G06
5578 G07
Conversion Gain and OIP3
vs LO Input Power
16
OIP3
16
12
26
14
NOISE FIGURE (dB)
12
10
8
6
4
–4
–17
10
–13
–5
–1
–9
LO INPUT POWER (dBm)
3
5578 G08
SSB Noise Figure
vs LO Input Power
30
18
16
Conversion Gain and OIP3
vs Supply Voltage
30
OIP3
12
26
OIP3 (dBm)
OIP3 (dBm)
GAIN (dB)
4
85°C
25°C
–40°C
GAIN
GAIN (dB)
8
22
8
22
85°C
25°C
–40°C
GAIN
18
4
18
0
14
2
–17
85°C
25°C
–40°C
–9
–13
–5
–1
LO INPUT POWER (dBm)
3
5578 G09
0
14
–4
3.0
3.1
3.2
3.3
3.4
SUPPLY VOLTAGE (V)
10
3.5
5578 G10
IM3 Level
vs RF Output Power (2-Tone)
0
0
IM2 Level
vs RF Output Power (1-Tone)
18
16
SSB Noise Figure
vs Supply Voltage
–20
IM3 LEVEL (dBc)
IM2 LEVEL (dBc)
–20
NOISE FIGURE (dB)
85°C
25°C
–40°C
4
6
14
12
10
8
6
–40
–40
–60
–60
–80
85°C
25°C
–40°C
6
–80
4
2
3.0
3.1
3.4
3.2
3.3
SUPPLY VOLTAGE (V)
85°C
25°C
–40°C
3.5
5578 G13
–100
2
4
–12 –10 –8 –6 –4 –2 0
RF OUTPUT POWER (dBm/TONE)
–100
2
–12 –10 –8 –6 –4 –2 0
RF OUTPUT POWER (dBm)
5578 G11
5578 G12
5578f
5
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