FEATURES
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LT5527
400MHz to 3.7GHz
5V High Signal Level
Downconverting Mixer
DESCRIPTION
The LT
®
5527 active mixer is optimized for high linearity,
wide dynamic range downconverter applications. The
IC includes a high speed differential LO buffer amplifier
driving a double-balanced mixer. Broadband, integrated
transformers on the RF and LO inputs provide single-ended
50Ω interfaces. The differential IF output allows convenient
interfacing to differential IF filters and amplifiers, or is
easily matched to drive 50Ω single-ended, with or without
an external transformer.
The RF input is internally matched to 50Ω from 1.7GHz
to 3GHz, and the LO input is internally matched to 50Ω
from 1.2GHz to 5GHz. The frequency range of both ports
is easily extended with simple external matching. The IF
output is partially matched and usable for IF frequencies
up to 600MHz.
The LT5527’s high level of integration minimizes the total
solution cost, board space and system-level variation.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Operation over a wider frequency range is possible with reduced performance. Consult factory
for information and assistance.
50Ω Single-Ended RF and LO Ports
Wide RF Frequency Range: 400MHz to 3.7GHz*
High Input IP3: 24.5dBm at 900MHz
23.5dBm at 1900MHz
Conversion Gain: 3.2dB at 900MHz
2.3dB at 1900MHz
Integrated LO Buffer: Low LO Drive Level
High LO-RF and LO-IF Isolation
Low Noise Figure: 11.6dB at 900MHz
12.5dB at 1900MHz
Very Few External Components
Enable Function
4.5V to 5.25V Supply Voltage Range
16-Lead (4mm
×
4mm) QFN Package
APPLICATIONS
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Cellular, WCDMA, TD-SCDMA and UMTS
Infrastructure
GSM900/GSM1800/GSM1900 Infrastructure
900MHz/2.4GHz/3.5GHz WLAN
MMDS, WiMAX
High Linearity Downmixer Applications
TYPICAL APPLICATION
High Signal Level Downmixer for Multi-Carrier Wireless Infrastructure
LO INPUT
–3dBm (TYP)
LT5527
G
C
, SSB NF (dB), IIP3 (dBm)
1.9GHz Conversion Gain, IIP3, SSB NF and
LO-RF Leakage vs LO Power
24
22 IIP3
20
18
16
14
12 SSB NF
10
8
6
4 G
C
2
–9
LO-RF
–20
–25
–30
IF = 240MHz
LOW SIDE LO –35
T
A
= 25°C
–40
V
CC
= 5V
–45
–50
–55
–60
–65
–70
–75
–7
–5
–3
–1
LO POWER (dBm)
1
3
5527 TA01b
LO-RF LEAKAGE (dBm)
4.7pF
IF
+
100nH
1nF
220nH
IF
OUTPUT
240MHz
RF
INPUT
RF
BIAS
GND
EN
V
CC2
V
CC1
1nF
IF
–
100nH
4.7pF
5V
1μF
5527 TA01a
5527fa
1
LT5527
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
NC
NC
16 15 14 13
NC 1
NC 2
RF 3
NC 4
5
EN
6
V
CC2
7
V
CC1
8
NC
17
12 GND
11 IF
+
10 IF
–
9 GND
NC
LO
Supply Voltage (V
CC1
, V
CC2
, IF+, IF–) .......................5.5V
Enable Voltage ................................ –0.3V to V
CC
+ 0.3V
LO Input Power (380MHz to 4GHz)......................10dBm
LO Input DC Voltage ..............................–1V to V
CC
+ 1V
Continuous RF Input Power
(400MHz to 4GHz) ...............................................12dBm
RF Input Power (400MHz to 4GHz) ......................15dBm
RF Input DC Voltage ...............................................±0.1V
Operating Temperature Range ................ –40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
Junction Temperature (T
J
) ................................... 125°C
UF PACKAGE
16-LEAD (4mm 4mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 37°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT5527EUF#PBF
TAPE AND REEL
LT5527EUF#TRPBF
PART MARKING
5527
PACKAGE DESCRIPTION
16-Lead (4mm
×
4mm) 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
circuit shown in Figure 1. (Note 3)
PARAMETER
Power Supply Requirements (V
CC
)
Supply Voltage
Supply Current
V
CC1
(Pin 7)
V
CC2
(Pin 6)
IF
+
+ IF
–
(Pin 11 + Pin 10)
Total Supply Current
EN = Low
CONDITIONS
V
CC
= 5V, EN = High, T
A
= 25°C, unless otherwise specified. Test
MIN
4.5
TYP
5
23.2
2.8
52
78
MAX
5.25
UNITS
VDC
mA
mA
mA
mA
μA
VDC
0.3
VDC
μA
μs
μs
50
3
3
90
60
88
100
Enable (EN) Low = Off, High = On
Shutdown Current
Input High Voltage (On)
Input Low Voltage (Off)
EN Pin Input Current
Turn-ON Time
Turn-OFF Time
EN = 5VDC
3
AC ELECTRICAL CHARACTERISTICS
PARAMETER
RF Input Frequency Range
LO Input Frequency Range
IF Output Frequency Range
CONDITIONS
Test circuit shown in Figure 1. (Notes 2, 3)
MIN
400
1200 to 3500
380
0.1 to 600
TYP
1700 to 3000
3700
MAX
UNITS
MHz
MHz
MHz
MHz
MHz
5527fa
No External Matching (Midband)
With External Matching (Low Band or High Band)
No External Matching
With External Matching
Requires Appropriate IF Matching
2
LT5527
AC ELECTRICAL CHARACTERISTICS
PARAMETER
RF Input Return Loss
LO Input Return Loss
IF Output Impedance
LO Input Power
CONDITIONS
Z
O
= 50Ω, 1700MHz to 3000MHz
Z
O
= 50Ω, 1200MHz to 3400MHz
Differential at 240MHz
1200MHz to 3500MHz
380MHz to 1200MHz
–8
–5
Test circuit shown in Figure 1. (Notes 2, 3)
MIN
TYP
>10
>12
407Ω||2.5pF
–3
0
2
5
MAX
UNITS
dB
dB
R||C
dBm
dBm
Standard Downmixer Application: V
CC
= 5V, EN = High, T
A
= 25°C, P
RF
= –5dBm (–5dBm/tone for 2-tone IIP3 tests, Δf = 1MHz), f
LO
= f
RF
– f
IF
, P
LO
= –3dBm (0dBm for 450MHz and 900MHz tests), IF output measured at 240MHz, unless otherwise noted. Test circuit shown
in Figure 1. (Notes 2, 3, 4)
PARAMETER
Conversion Gain
CONDITIONS
RF = 450MHz, IF = 140MHz, High Side LO
RF = 900MHz, IF = 140MHz
RF = 1700MHz
RF = 1900MHz
RF = 2200MHz
RF = 2650MHz
RF = 3500MHz, IF = 380MHz
T
A
= –40°C to 85°C, RF = 1900MHz
RF = 450MHz, IF = 140MHz, High Side LO
RF = 900MHz, IF = 140MHz
RF = 1700MHz
RF = 1900MHz
RF = 2200MHz
RF = 2650MHz
RF = 3500MHz, IF = 380MHz
RF = 450MHz, IF = 140MHz, High Side LO
RF = 900MHz, IF = 140MHz
RF = 1700MHz
RF = 1900MHz
RF = 2200MHz
RF = 2650MHz
RF = 3500MHz, IF = 380MHz
f
LO
= 400MHz to 2100MHz
f
LO
= 2100MHz to 3200MHz
f
LO
= 400MHz to 700MHz
f
LO
= 700MHz to 3200MHz
f
RF
= 400MHz to 2200MHz
f
RF
= 2200MHz to 3700MHz
f
RF
= 400MHz to 800MHz
f
RF
= 800MHz to 3700MHz
900MHz: f
RF
= 830MHz at –5dBm, f
IF
= 140MHz
1900MHz: f
RF
= 1780MHz at –5dBm, f
IF
= 240MHz
900MHz: f
RF
= 806.67MHz at –5dBm, f
IF
= 140MHz
1900MHz: f
RF
= 1740MHz at –5dBm, f
IF
= 240MHz
RF = 450MHz, IF = 140MHz, High Side
LO RF = 900MHz, IF = 140MHz
RF = 1900MHz
MIN
TYP
2.5
3.4
2.3
2.3
2.0
1.8
0.3
–0.018
23.2
24.5
24.2
23.5
22.7
20.8
18.2
13.3
11.6
12.1
12.5
13.2
13.9
16.1
≤–44
≤–36
≤–40
≤–50
>43
>38
>42
>54
–60
–65
–73
–63
9.5
8.9
9.0
MAX
UNITS
dB
dB
dB
dB
dB
dB
dB
dB/°C
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dB
dB
dB
dB
dB
dB
dB
dBm
dBm
dBm
dBm
dB
dB
dB
dB
dBc
dBc
dBc
dBc
dBm
dBm
dBm
Conversion Gain vs Temperature
Input 3rd Order Intercept
Single-Sideband Noise Figure
LO to RF Leakage
LO to IF Leakage
RF to LO Isolation
RF to IF Isolation
2RF-2LO Output Spurious Product
(f
RF
= fLO + f
IF
/2)
3RF-3LO Output Spurious Product
(f
RF
= fLO + f
IF
/3)
Input 1dB Compression
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:
450MHz, 900MHz and 3500MHz performance measured with
external LO and RF matching. See Figure 1 and Applications Information.
Note 3:
Specifications over the –40°C to 85°C temperature range are
assured by design, characterization and correlation with statistical process
controls.
Note 4:
SSB Noise Figure measurements performed with a small-signal
noise source and bandpass filter on RF input, and no other RF signal
applied.
5527fa
3
LT5527
Midband (No external RF/LO matching)
V
CC
= 5V, EN = High, P
RF
= –5dBm (–5dBm/tone for 2-tone IIP3 tests, Δf = 1MHz), P
LO
= –3dBm, IF output measured at 240MHz, unless
otherwise noted. Test circuit shown in Figure 1.
Conversion Gain, IIP3 and NF
vs RF Frequency
24
22
G
C
, SSB NF (dB), IIP3 (dBm)
20
18
LO LEAKAGE (dBm)
16
14
12
10
8
6
4
2
G
C
1900
2300
2500
2100
RF FREQUENCY (MHz)
2700
5527 G01
TYPICAL AC PERFORMANCE CHARACTERISTICS
LO Leakage vs LO Frequency
–30
IIP3
–35
–40
–45
SSB NF
–50
–55
–60
–65
–70
–75
–80
–85
–90
1200
1500
1800 2100 2400 2700
LO FREQUENCY (MHz)
LO-IF
LO-RF
T
A
= 25°C
P
LO
= –3dBm
RF Isolation vs RF Frequency
–30
–35
–40
–45
ISOLATION (dB)
–50
–55
–60
–65
–70
–75
–80
–85
3000
–90
1700
1900
2300
2500
2100
RF FREQUENCY (MHz)
2700
5527 G03
T
A
= 25°C
RF-LO
T
A
= 25°C
IF = 240MHz
LOW SIDE LO
HIGH SIDE LO
RF-IF
0
1700
5527 G02
Conversion Gain and IIP3
vs Temperature (Low Side LO)
25
24
23
22
IIP3 (dBm)
21
20
19
18
17
16
15
–50
–25
25
50
0
TEMPERATURE (°C)
75
G
C
IF = 240MHz
1700MHz
1900MHz
2200MHz
IIP3
10
9
8
7
IIP3 (dBm)
6
5
4
3
2
1
G
C
(dB)
25
24
23
22
21
20
19
18
17
16
Conversion Gain and IIP3
vs Temperature (High Side LO)
IIP3
10
9
8
7
6
IF = 240MHz
1700MHz
1900MHz
2200MHz
5
4
3
G
C
2
1
G
C
(dB)
G
C
, SSB NF (dB), IIP3 (dBm)
24
22
20
18
16
14
12
10
8
6
4
2
1900MHz Conversion Gain, IIP3
and NF vs Supply Voltage
IIP3
LOW SIDE LO
IF = 240MHz
–40°C
25°C
85°C
SSB NF
G
C
0
100
5527 G04
15
–50
–25
25
50
0
TEMPERATURE (°C)
75
0
100
5527 G05
0
4.5
5
4.75
5.25
SUPPLY VOLTAGE (V)
5.5
5527 G06
1700MHz Conversion Gain, IIP3
and NF vs LO Power
25
23
G
C
, SSB NF (dB), IIP3 (dBm)
21
19
17
15
13
11
9
7
5
3
1
G
C
–9
–7
–5
–3
–1
LO INPUT POWER (dBm)
1
3
5527 G07
1900MHz Conversion Gain, IIP3
and NF vs LO Power
24
24
IIP3
LOW SIDE LO
IF = 240MHz
–40°C
25°C
85°C
22
G
C
, SSB NF (dB), IIP3 (dBm)
22
G
C
, SSB NF (dB), IIP3 (dBm)
20
18
16
14
12
10
8
6
4
2
0
–9
–7
–5
–3
–1
LO INPUT POWER (dBm)
1
3
5527 G08
2200MHz Conversion Gain, IIP3
and NF vs LO Power
20 IIP3
18
16
14
12
10
8
6
4 G
C
2
0
–9
–7
SSB NF
LOW SIDE LO
IF = 240MHz
–40°C
25°C
85°C
IIP3
SSB NF
LOW SIDE LO
IF = 240MHz
–40°C
25°C
85°C
SSB NF
G
C
–5
–3
–1
LO INPUT POWER (dBm)
1
3
5527 G09
5527fa
4
LT5527
Midband (No external RF/LO matching)
V
CC
= 5V, EN = High, P
RF
= –5dBm (–5dBm/tone for 2-tone IIP3 tests, Δf = 1MHz), P
LO
= –3dBm, IF output measured at 240MHz, unless
otherwise noted. Test circuit shown in Figure 1.
IF Output Power, IM3 and IM5 vs
RF Input Power (2 Input Tones)
10
0
OUTPUT POWER/TONE (dBm)
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–21
IM3
IM5
0
–6
–3
–18 –15 –12 –9
RF INPUT POWER (dBm/TONE)
5527 G10
T
A
= 25°C
RF1 = 1899.5MHz
RF2 = 1900.5MHz
LO = 1660MHz
IF
OUT
OUTPUT POWER (dBm)
15
TYPICAL AC PERFORMANCE CHARACTERISTICS
IF
OUT
, 2
×
2 and 3
×
3 Spurs
vs RF Input Power (Single Tone)
T
A
= 25°C
5 LO = 1660MHz
–5 IF = 240MHz
–15
–25
–35
–45
–55
–65
–75
–85
–95
–18 –15 –12 –9 –6 –3 0 3 6
RF INPUT POWER (dBm)
9
3RF-3LO
(RF = 1740MHz)
2
×
2 and 3
×
3 Spurs
vs LO Power (Single Tone)
–50
–55
RELATIVE SPUR LEVEL (dBc)
3RF-3LO
(RF = 1740MHz)
IF
OUT
(RF = 1900MHz)
–60
–65
–70
–75
–80
–85
–90
–95
T
A
= 25°C
LO = 1660MHz
IF = 240MHz
P
RF
= –5dBm
–9
–7
2RF-2LO
(RF = 1780MHz)
2RF-2LO
(RF = 1780MHz)
–100
12
5527 G11
–3
–1
–5
LO INPUT POWER (dBm)
1
3
5527 G12
High Band (3500MHz application with external RF matching) V
CC
= 5V, EN = High, P
RF
= –5dBm (–5dBm/tone for 2-tone IIP3 tests,
Δf = 1MHz), low side LO, P
LO
= –3dBm, IF output measured at 380MHz, unless otherwise noted. Test circuit shown in Figure 1.
Conversion Gain, IIP3 and SSB
NF vs RF Frequency
20
18
G
C
, SSB NF (dB), IIP3 (dBm)
16
14
12
10
8
6
4
2
G
C
3500
3400
3600
RF FREQUENCY (MHz)
3700
5527 G13
3500MHz Conversion Gain, IIP3
and SSB NF vs LO Power
19
–20
IIP3
SSB NF
–30
LO LEAKAGE (dBm)
17
LO Leakage and RF-LO Isolation
vs LO and RF Frequency
60
IIP3
SSB NF
LOW SIDE LO
IF = 380MHz
T
A
= 25°C
G
C
, SSB NF (dB), IIP3 (dBm)
15
13
11
9
7
5
3
1
–1
–9
–7
–3
–1
–5
LO INPUT POWER (dBm)
1
3
5527 G14
50
RF-LO ISOLATION (dB)
LO-RF
LOW SIDE LO
IF = 380MHz
T
A
= 25°C
–40
RF-LO
40
–50
30
–60
G
C
LO-IF
20
0
3300
–70
3000
3400
3200
3600
LO/RF FREQUENCY (MHz)
10
3800
5527 G15
Low Band (450MHz application with external RF/LO matching) V
CC
= 5V, EN = High, P
RF
= –5dBm (–5dBm/tone for 2-tone IIP3 tests,
Δf = 1MHz), P
LO
= 0dBm, IF output measured at 140MHz, unless otherwise noted. Test circuit shown in Figure 1.
Conversion Gain, IIP3 and NF
vs RF Frequency
24
22
G
C
, SSB NF (dB), IIP3 (dBm)
20
18
16
14
12
10
8
6
4
2
0
400
G
C
450
425
475
RF FREQUENCY (MHz)
500
5527 G18
450MHz Conversion Gain,
IIP3 and NF vs LO Power
24
–20
IIP3
HIGH SIDE LO
IF = 140MHz
–40°C
25°C
85°C
–30
LO LEAKAGE (dBm)
22
G
C
, SSB NF (dB), IIP3 (dBm)
LO Leakage vs LO Frequency
T
A
= 25°C
P
LO
= 0dBm
LO-IF
(450MHz APP)
–40
–50
–60
–70
–80
400
LO-RF
(900MHz APP)
IIP3
HIGH SIDE LO
T
A
= 25°C
IF = 140MHz
20
18
16
14
12
10
8
6
4
2
0
SSB NF
SSB NF
LO-RF
(450MHz APP)
LO-IF
(900MHz APP)
G
C
–6
–4
–2
0
2
LO INPUT POWER (dBm)
4
6
5527 G19
600
800
1000
LO FREQUENCY (MHz)
1200
5527 G20
5527fa
5
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