LT5520
1.3GHz to 2.3GHz
High Linearity
Upconverting Mixer
FEATURES
DESCRIPTIO
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Wide RF Output Frequency Range: 1.3GHz
The LT 5520 mixer is designed to meet the high linearity
to 2.3GHz
requirements of wireless and cable infrastructure trans-
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15.9dBm Typical Input IP3 at 1.9GHz
mission applications. A high-speed, internally matched,
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On-Chip RF Output Transformer
LO amplifier drives a double-balanced mixer core, allow-
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No External LO or RF Matching Required
ing the use of a low power, single-ended LO source. An RF
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Single-Ended LO and RF Operation
output transformer is integrated, thus eliminating the
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Integrated LO Buffer: 5dBm Drive Level
need for external matching components at the RF output,
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Low LO to RF Leakage: 41dBm Typical
while reducing system cost, component count, board area
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Wide IF Frequency Range: DC to 400MHz
and system-level variations. The IF port can be easily
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Enable Function with Low Off-State Leakage Current
matched to a broad range of frequencies for use in many
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Single 5V Supply
different applications.
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Small 16-Lead QFN Plastic Package
The LT5520 mixer delivers 15.9dBm typical input 3rd
U
order intercept point at 1.9GHz with IF input signal levels
APPLICATIO S
of 10dBm. The input 1dB compression point is typically
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Wireless Infrastructure
4dBm. The IC requires only a single 5V supply.
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Cable Downlink Infrastructure
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Point-to-Point Data Communications , LTC and LT are registered trademarks of Linear Technology Corporation.
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High Linearity Frequency Conversion
TYPICAL APPLICATIO
5V
DC
RF Output Power and Output IM3 vs
1F 1000pF
IF Input Power (Two Input Tones)
39nH
10
EN V V V
CC1 CC2 CC3
0
BIAS 10
100 10pF
BPF
P
220pF OUT
20
4:1
IF
+
+
INPUT RF 30
IF
15pF
40
RF
PA
IF OUTPUT 50
RF
P = 5dBm
220pF LO
BPF
100 60
f = 1760MHz
LO
IM3
f = 140MHz
IF1
70
f = 141MHz
IF2
f = 1900MHz
80 RF
T = 25C
A
GND
90
16 12 8 4 0 4
5pF 5pF
85
IF INPUT POWER (dBm/TONE)
+
(OPTIONAL) LO LO LT5520
5520 F01b
LO INPUT 5520 F01
5dBm
Figure 1. Frequency Conversion in Wireless Infrastructure Transmitter
5520f
1
P , IM3 (dBm/TONE)
OUT
U
ULT5520
UUW
ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO
(Note 1)
TOP VIEW
ORDER PART
Supply Voltage ....................................................... 5.5V
NUMBER
Enable Voltage ............................. 0.3V to (V + 0.3V)
CC 16 15 14 13
LO Input Power (Differential) .............................. 10dBm GND 1 12 GND
LT5520EUF
+
+
+
IF 2 11 RF
RF to RF Differential DC Voltage...................... 0.13V
17
IF 3 10 RF
RF Output DC Common Mode Voltage ......... 1V to V
CC
GND
GND 4 9
IF Input Power (Differential) ............................... 10dBm
5 6 7 8
UF PART
+
IF , IF DC Currents .............................................. 25mA
MARKING
+
LO to LO Differential DC Voltage .......................... 1V
UF PACKAGE
16-LEAD (4mm 4mm) PLASTIC QFN
LO Input DC Common Mode Voltage ............ 1V to V
CC
EXPOSED PAD IS GND (PIN 17), 5520
MUST BE SOLDERED TO PCB
Operating Temperature Range .................40 C to 85 C
T = 125 C, q = 37 C/W
JMAX JA
Storage Temperature Range ................. 65 C to 125 C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Junction Temperature (T ).................................... 125 C
J
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
IF Input Frequency Range DC to 400 MHz
LO Input Frequency Range 900 to 2700 MHz
RF Output Frequency Range 1300 to 2300 MHz
1900MHz Application: V = 5V , EN = High, T = 25 C, IF input = 140MHz at 10dBm, LO input = 1.76GHz at 5dBm, RF output
CC DC A
measured at 1900MHz, unless otherwise noted. Test circuit shown in Figure 2. (Notes 2, 3)
PARAMETER CONDITIONS MIN TYP MAX UNITS
IF Input Return Loss Z = 50W , with External Matching 20 dB
O
LO Input Return Loss Z = 50W 16 dB
O
RF Output Return Loss Z = 50W 20 dB
O
LO Input Power 10 to 0 dBm
Conversion Gain 1 dB
Input 3rd Order Intercept 10dBm/Tone, D f = 1MHz 15.9 dBm
Input 2nd Order Intercept 10dBm, Single-Tone 45 dBm
LO to RF Leakage 41 dBm
LO to IF Leakage 35 dBm
Input 1dB Compression 4 dBm
IF Common Mode Voltage Internally Biased 1.77 V
DC
Noise Figure Single Side Band 15 dB
DC ELECTRICAL CHARACTERISTICS
(Test Circuit Shown in Figure 2) V = 5V , EN = High , T = 25 C (Note 3), unless otherwise noted.
CC DC A
PARAMETER CONDITIONS MIN TYP MAX UNITS
Enable (EN) Low = Off, High = On
Turn-On Time (Note 4) 2 m s
Turn-Off Time (Note 4) 6 m s
Input Current V = 5V 110 m A
ENABLE DC
5520f
2
GND
EN
LO
V
CC1
+
V LO
CC2
GND
V
CC3
U WWW