LT5579
1.5GHz to 3.8GHz
High Linearity
Upconverting Mixer
FeaTures
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DescripTion
The LT
®
5579 mixer is a high performance upconverting
mixer optimized for frequencies in the 1.5GHz to 3.8GHz
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 2.6GHz
operation, the LT5579 provides high conversion gain of
1.3dB, high OIP3 of +26dBm and a low noise floor of
–157.5dBm/Hz at a –5dBm RF output signal level.
The LT5579 offers a high performance alternative to pas-
sive mixers. Unlike passive mixers, which have conversion
loss and require high LO drive levels, the LT5579 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.
High Output IP3: +27.3dBm at 2.14GHz
Low Noise Floor: –158dBm/Hz (P
OUT
= –5dBm)
High Conversion Gain: 2.6dB at 2.14GHz
Wide Frequency Range: 1.5GHz to 3.8GHz*
Low LO Leakage
Single-Ended RF and LO
Low LO Drive Level: –1dBm
Single 3.3V Supply
5mm × 5mm QFN24 Package
applicaTions
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GSM/EDGE, W-CDMA, UMTS, LTE and TD-SCDMA
Basestations
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2.6GHz and 3.5GHz WiMAX Basestations
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2.4GHz ISM Band Transmitters
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High Performance Transmitters
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.
*Operation over wider frequency range is possible with reduced performance.
Consult Linear Technology for information and assistance.
Typical applicaTion
Frequency Upconversion in 2.14GHz W-CDMA Transmitter
LO INPUT
–1dBm (TYP)
Gain, NF and OIP3 vs
RF Output Frequency
LT5579
LO
30
GAIN (dB), NF (dB), OIP3 (dBm)
25
20
15
10
5
0
1900
SSB NF
T
A
= 25°C
V
CC
= 3.3V
f
IF
= 240MHz
f
LO
= f
RF
+ f
IF
OIP3
GND
11
IF
INPUT MABAES0061
82pF
240MHz
4:1
33pF
40nH
IF
+
IF
–
40nH
11
RF
3.9nH
0.45pF
BIAS
RF
OUTPUT
2140MHz
GAIN
2000
2100
2200
2300
RF FREQUENCY (MHz)
2400
5579 TA01b
82pF
V
CC
1µF
100pF
5579 TA01a
1nF
V
CC
3.3V
5579fa
LT5579
absoluTe MaxiMuM raTings
Supply Voltage ............................................................4V
LO Input Power .................................................. +10dBm
LO Input DC Voltage........................ –0.3V to V
CC
+ 0.3V
RF Output DC Current ........................................... 60mA
.
IF Input Power (Differential) .............................. +13dBm
+
, IF
–
DC Currents .............................................. 60mA
IF
T
JMAX
.................................................................... 150°C
Operating Temperature Range .................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
(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
+
3
4
IF
–
GND 5
GND 6
T
JMAX
= 150°C, θ
JA
= 34°C/W, θ
JC
= 3°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
UH PACKAGE
24-LEAD (5mm 5mm) PLASTIC QFN
orDer inForMaTion
LEAD FREE FINISH
LT5579IUH#PBF
TAPE AND REEL
LT5579IUH#TRPBF
PART MARKING
5579
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
3.15
TYP
3.3
226
241
570
MAX
3.6
250
UNITS
V
DC
mA
mA
mV
V
CC
= 3.3V, P
LO
= –1dBm
V
CC
= 3.6V, 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 1000
750 to 4300
900 to 3900
MAX
UNITS
MHz
MHz
MHz
Requires Matching Below 1GHz
Requires Matching
5579fa
LT5579
V
CC
= 3.3V, T
A
= 25°C, P
IF
= –5dBm (–5dBm/tone for 2-tone tests,
∆f
= 1MHz), P
LO
= –1dBm, unless otherwise noted. 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, 1100MHz to 4000MHz
Z
O
= 50Ω, External Match
MIN
TYP
15
>9
>10
–5 to 2
MAX
UNITS
dB
dB
dB
dBm
ac elecTrical characTerisTics
V
CC
= 3.3V, T
A
= 25°C, P
IF
= –5dBm (–5dBm/tone for 2-tone tests,
∆f
= 1MHz), P
LO
= –1dBm, unless otherwise noted.
Low side LO for 1750MHz and 3600MHz. High side LO for 2140MHz and 2600MHz. (Notes 2, 3, 4)
PARAMETER
Conversion Gain
CONDITIONS
f
IF
= 240MHz, f
RF
= 1750MHz
f
IF
= 240MHz, f
RF
= 2140MHz
f
IF
= 456MHz, f
RF
= 2600MHz
f
IF
= 456MHz, f
RF
= 3600MHz
f
IF
= 240MHz, f
RF
= 1750MHz
f
IF
= 240MHz, f
RF
= 2140MHz
f
IF
= 456MHz, f
RF
= 2600MHz
f
IF
= 456MHz, f
RF
= 3600MHz
f
IF
= 240MHz, f
RF
= 1750MHz
f
IF
= 240MHz, f
RF
= 2140MHz
f
IF
= 456MHz, f
RF
= 2600MHz
f
IF
= 456MHz, f
RF
= 3600MHz
f
IF
= 240MHz, f
RF
= 1750MHz
f
IF
= 240MHz, f
RF
= 2140MHz
f
IF
= 456MHz, f
RF
= 2600MHz
f
IF
= 456MHz, f
RF
= 3600MHz
f
IF
= 240MHz, f
RF
= 1750MHz
f
IF
= 240MHz, f
RF
= 2140MHz
f
IF
= 456MHz, f
RF
= 2600MHz
f
IF
= 456MHz, f
RF
= 3600MHz
f
IF
= 240MHz, f
RF
= 1750MHz
f
IF
= 240MHz, f
RF
= 2140MHz
f
IF
= 456MHz, f
RF
= 2600MHz
f
IF
= 456MHz, f
RF
= 3600MHz
f
IF
= 240MHz, f
RF
= 1750MHz
f
IF
= 240MHz, f
RF
= 2140MHz
f
IF
= 456MHz, f
RF
= 2600MHz
f
IF
= 456MHz, f
RF
= 3600MHz
f
IF
= 240MHz, f
RF
= 1750MHz
f
IF
= 240MHz, f
RF
= 2140MHz
f
IF
= 456MHz, f
RF
= 2600MHz
f
IF
= 456MHz, f
RF
= 3600MHz
f
IF
= 240MHz, f
RF
= 1750MHz
f
IF
= 240MHz, f
RF
= 2140MHz
f
IF
= 456MHz, f
RF
= 2600MHz
f
IF
= 456MHz, f
RF
= 3600MHz
f
IF
= 240MHz, f
RF
= 1750MHz
f
IF
= 240MHz, f
RF
= 2140MHz
f
IF
= 456MHz, f
RF
= 2600MHz
f
IF
= 456MHz, f
RF
= 3600MHz
MIN
TYP
1.8
2.6
1.3
–0.5
–0.020
–0.020
–0.027
–0.027
29
27.3
26.2
23.2
41
42
45
54
9.2
9.9
12
12
–159.5
–158.1
–157.5
–155.5
13.3
13.9
13.7
10.7
83
81
74
73
–23
–28
–26
–22
–39
–35
–36
–35
MAX
UNITS
dB
dB
dB
dB
dB/°C
dB/°C
dB/°C
dB/°C
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dB
dB
dB
dB
dBm/Hz
dBm/Hz
dBm/Hz
dBm/Hz
dBm
dBm
dBm
dBm
dB
dB
dB
dB
dBm
dBm
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
Single Sideband Noise Figure
Output Noise Floor (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 LT5579 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.
5579fa
LT5579
Typical Dc perForMance characTerisTics
Supply Current vs Supply Voltage
255
245
SUPPLY CURRENT (mA)
235
225
215
205
195
85°C
25°C
–40°C
3.0
3.1
3.2
3.3
3.4
SUPPLY VOLTAGE (V)
3.5
3.6
5579 G01
(Test Circuit Shown in Figure 1)
Typical ac perForMance characTerisTics
3300MHz to 3800MHz Application:
V
CC
= 3.3V, T
A
= 25°C, f
IF
= 456MHz, P
IF
= –5dBm (–5dBm/tone for 2-tone tests, ∆f = 1MHz), low side LO, P
LO
= –1dBm,
output measured at 3600MHz, unless otherwise noted. (Test circuit shown in Figure 1)
SSB Noise Figure Distribution at
3600MHz
30
25
DISTRIBUTION (%)
20
15
10
5
0
T
A
= 90°C
T
A
= 25°C
T
A
= –45°C
Gain Distribution at 3600MHz
25
T
A
= 90°C
T
A
= 25°C
T
A
= –45°C
DISTRIBUTION (%)
16
14
12
10
8
6
4
2
0.5
1.0 1.5
5579 G02
OIP3 Distribution at 3600MHz
T
A
= 90°C
T
A
= 25°C
T
A
= –45°C
20
DISTRIBUTION (%)
15
10
5
0
–2.5 –2.0 –1.5 –1.0 –0.5 0
GAIN (dB)
0
19
20
21
23
22
OIP3 (dBm)
24
25
26
5579 G03
10
11
12
13
NOISE FIGURE (dB)
14
5579 G04
5579fa
LT5579
Typical ac perForMance characTerisTics
Conversion Gain and OIP3
vs RF Output Frequency
16
OIP3
28
20
18
16
NOISE FIGURE (dB)
14
12
10
8
6
8
–4
3200 3300 3400 3500 3600 3700 3800 3900
RF FREQUENCY (MHz)
5579 G05
3300MHz to 3800MHz Application:
V
CC
= 3.3V, T
A
= 25°C, f
IF
= 456MHz, P
IF
= –5dBm (–5dBm/tone for 2-tone tests, ∆f = 1MHz), low side LO, P
LO
= –1dBm,
output measured at 3600MHz, unless otherwise noted. (Test circuit shown in Figure 1)
SSB Noise Figure
vs RF Output Frequency
0
LO-RF Leakage
vs RF Output Frequency
12
24
–10
LO LEAKAGE (dBm)
85°C
25°C
–40°C
GAIN (dB)
8
4
85°C
25°C
–40°C
GAIN
20
–20
OIP3 (dBm)
16
–30
0
12
–40
4
3200 3300 3400 3500 3600 3700 3800 3900
RF FREQUENCY (MHz)
5579 G06
–50
3200 3300 3400 3500 3600 3700 3800 3900
RF FREQUENCY (MHz)
5579 G07
85°C
25°C
–40°C
Conversion Gain and OIP3
vs LO Input Power
16
26
20
18
12
NOISE FIGURE (dB)
OIP3
85°C
25°C
–40°C
GAIN
0
10
22
16
SSB Noise Figure
vs LO Input Power
16
Conversion Gain and OIP3
vs Supply Voltage
26
12
OIP3
GAIN (dB)
8
85°C
25°C
–40°C
GAIN
85°C
25°C
–40°C
–6
–10
–2
LO INPUT POWER (dBm)
2
5579 G09
22
GAIN (dB)
8
18
14
12
10
8
6
18
OIP3 (dBm)
OIP3 (dBm)
4
14
4
14
0
10
–4
–17
–13
–5
–1
–9
LO INPUT POWER (dBm)
3
5579 G08
6
4
–14
–4
3.0
3.1
3.2
3.3
3.4
SUPPLY VOLTAGE (V)
3.5
6
3.6
5579 G10
IM3 Level
vs RF Output Power (2-Tone)
0
–20
IM3 LEVEL (dBc)
IM2 LEVEL (dBc)
0
–20
IM2 Level
vs RF Output Power (2-Tone)
20
18
16
NOISE FIGURE (dB)
14
12
10
8
6
6
SSB Noise Figure
vs Supply Voltage
–40
–40
–60
–80
–60
–80
–100
2
4
–12 –10 –8 –6 –4 –2 0
RF OUTPUT POWER (dBm/TONE)
85°C
25°C
–40°C
6
–100
2
4
–12 –10 –8 –6 –4 –2 0
RF OUTPUT POWER (dBm/TONE)
85°C
25°C
–40°C
4
3.0
85°C
25°C
–40°C
3.1
3.4
3.3
SUPPLY VOLTAGE (V)
3.2
3.5
3.6
5579 G13
5579 G11
5579 G12
5579fa
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