LT5519
0.7GHz to 1.4GHz
High Linearity
Upconverting Mixer
FEATURES
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DESCRIPTIO
Wide RF Frequency Range: 0.7GHz to 1.4GHz
17.1dBm Typical Input IP3 at 1GHz
On-Chip RF Output Transformer
On-Chip 50Ω Matched LO and RF Ports
Single-Ended LO and RF Operation
Integrated LO Buffer: –5dBm Drive Level
Low LO to RF Leakage: – 44dBm Typical
Noise Figure: 13.6dB
Wide IF Frequency Range: 1MHz to 400MHz
Enable Function with Low Off-State Leakage Current
Single 5V Supply
Small 16-Lead QFN Plastic Package
The LT
®
5519 mixer is designed to meet the high linearity
requirements of wireless and cable infrastructure trans-
mission systems. A high speed, internally 50Ω matched,
LO amplifier drives a double-balanced mixer core, allow-
ing the use of a low power, single-ended LO source. An RF
output transformer is integrated, thus eliminating the
need for external matching components at the RF output,
while reducing system cost, component count, board area
and system-level variations. The IF port can be easily
matched to a broad range of frequencies for use in many
different applications.
The LT5519 mixer delivers +17.1dBm typical input 3rd
order intercept point at 1GHz with IF input signal levels of
–10dBm. The input 1dB compression point is typically
+5.5dBm. The IC requires only a single 5V supply.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
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Wireless Infrastructure
Cable Downlink Infrastructure
Point-to-Point and Point-to-Multipoint Data
Communications
High Linearity Frequency Conversion
TYPICAL APPLICATIO
5V
DC
1µF
1000pF
39nH
10
EN
BPF
4:1
IF
33pF
IF
–
220pF
100Ω
+
V
CC1
V
CC2
V
CC3
P
OUT
, IM3, IM2 (dBm/TONE)
220pF
100Ω
BIAS
LT5519
10pF
+
RF
BPF
PA
RF
–
GND
5pF
(OPTIONAL)
LO INPUT
–5dBm
LO
+
85Ω
5pF
LO
–
5519 F01a
Figure 1. Frequency Conversion in Wireless Infrastructure Transmitter
5519f
U
RF Output Power, IM3 and IM2
vs IF Input Power (Two Input Tones)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–16
–12
–4
0
–8
IF INPUT POWER (dBm/TONE)
4
5519 F01b
U
U
P
OUT
f
RF
= 1000MHz
P
LO
= –5dBm
f
LO
= 1140MHz
f
IF1
= 140MHz
f
IF2
= 141MHz
T
A
= 25°C
IM3
IM2
1
LT5519
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
16 15 14 13
GND 1
IF
+
2
IF
–
3
GND 4
5
6
7
8
17
12 GND
11 RF
+
10 RF
–
9 GND
Supply Voltage ....................................................... 5.5V
Enable Voltage ............................. –0.3V to (V
CC
+ 0.3V)
LO Input Power (Differential) ............................ +10dBm
LO
+
to LO
–
Differential DC Voltage ..........................
±1V
LO
+
and LO
–
DC Common Mode Voltage ...... –1V to V
CC
IF Input Power (Differential) ............................. +10dBm
IF
+
and IF
–
DC Currents ........................................ 25mA
RF
+
to RF
–
Differential DC Voltage ......................
±0.13V
RF
+
and RF
–
DC Common Mode Voltage ...... –1V to V
CC
Operating Temperature Range .................–40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
Junction Temperature (T
J
).................................... 125°C
ORDER PART
NUMBER
LT5519EUF
GND
GND
LO
–
LO
+
V
CC1
V
CC2
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
V
CC3
UF PART
MARKING
5519
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER
IF Input Frequency Range
LO Input Frequency Range
RF Output Frequency Range
CONDITIONS
MIN
TYP
1 to 400
300 to 1800
700 to 1400
MAX
UNITS
MHz
MHz
MHz
1GHz Application: V
CC
= 5V
DC
, EN = High, T
A
= 25°C, IF input = 140MHz at –10dBm, LO input = 1.14GHz at –5dBm, RF output measured
at 1GHz, unless otherwise noted. (Test circuit shown in Figure 2) (Notes 2, 3)
PARAMETER
IF Input Return Loss
LO Input Return Loss
RF Output Return Loss
LO Input Power
Conversion Gain
Input 3rd Order Intercept
Input 2nd Order Intercept
LO to RF Leakage
LO to IF Leakage
Input 1dB Compression
IF Common Mode Voltage
Noise Figure
Internally Biased
Single-Side Band
–10dBm/Tone,
∆f
= 1MHz
–10dBm, Single Tone
CONDITIONS
Z
O
= 50Ω, with External Matching
Z
O
= 50Ω
Z
O
= 50Ω
MIN
TYP
20
17
20
–10 to 0
–0.6
17.1
48
–44
–40
5.5
1.77
13.6
MAX
UNITS
dB
dB
dB
dBm
dB
dBm
dBm
dBm
dBm
dBm
V
DC
dB
EN
2
U
5519f
W
U
U
W W
W
LT5519
DC ELECTRICAL CHARACTERISTICS
(Test Circuit Shown in Figure 2) V
CC
= 5V
DC
, EN = High, T
A
= 25°C, unless otherwise noted. (Note 3)
PARAMETER
Enable (EN) Low = OFF, High = ON
Turn-On Time (Note 4)
Turn-Off Time (Note 4)
Input Current
Enable = High (ON)
Enable = Low (OFF)
Power Supply Requirements (V
CC
)
Supply Voltage
Supply Current
Shutdown Current
V
CC
= 5V
DC
EN = Low
4.5 to 5.25
60
1
70
100
V
DC
mA
µA
V
ENABLE
= 5V
DC
3
0.5
2
6
1
10
µs
µs
µA
V
DC
V
DC
CONDITIONS
MIN
TYP
MAX
UNITS
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
External components on the final test circuit are optimized for
operation at f
RF
= 1GHz, f
LO
= 1.14GHz and f
IF
= 140MHz.
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:
Turn-On and Turn-Off times are based on the rise and fall times of
the RF output envelope from –40dBm to full power with an IF input power
of –10dBm.
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
66
64
T
A
= 85°C
T
A
= 25°C
SUPPLY CURRENT (mA)
62
60
58
56
54
52
50
4
4.25
SHUTDOWN CURRENT (µA)
U W
4.5
(Test Circuit Shown in Figure 2)
Shutdown Current
vs Supply Voltage
1.2
1.0
0.8
T
A
= 85°C
0.6
0.4
0.2
0
5
5.25
4.75
SUPPLY VOLTAGE (V)
5.5
5519 G01
T
A
= –40°C
T
A
= –40°C
T
A
= 25°C
4
4.25
4.5
4.75
5
SUPPLY VOLTAGE (V)
5.25
5.5
5519 G02
5519f
3
LT5519
TYPICAL PERFOR A CE CHARACTERISTICS
V
CC
= 5V
DC
, EN = High, T
A
= 25°C, IF input = 140MHz at –10dBm, LO input = 1.14GHz at –5dBm, RF output measured at 1000MHz,
unless otherwise noted. For 2-tone inputs: 2nd IF input = 141MHz at –10dBm. (Test Circuit Shown in Figure 2.)
Conversion Gain and SSB Noise
Figure vs RF Output Frequency
18
16
14
12
GAIN, NF (dB)
10
8
6
4
2
0
–2
–4
–6
500
GAIN
LOW SIDE AND HIGH SIDE LO
700
1100
1300
900
RF OUTPUT FREQUENCY (MHz)
1500
5519 G03
HIGH SIDE LO
LOW SIDE LO
NF
21
40
LO LEAKAGE (dBm)
IIP3 (dBm)
Conversion Gain and SSB Noise
Figure vs LO Input Power
16
14
12
10
T
A
= 85°C
T
A
= 25°C
NF
20
18
16
14
19
IIP3 (dBm)
NF (dB)
18
IIP3
17
T
A
= –40°C
16
T
A
= 85°C
15
–16
T
A
= 25°C
40
IIP2 (dBm)
30
20
10
0
–12
–8
–4
0
LO INPUT POWER (dBm)
4
5519 G07
LO LEAKAGE (dBm)
GAIN (dB)
8
6
4
2
0
–2
–4
–16
GAIN
T
A
= –40°C
T
A
= 25°C
T
A
= –40°C
T
A
= 85°C
–12
–6
–4
–8
LO INPUT POWER (dBm)
–2
5519 G06
IIP3 and IIP2 vs
LO Input Power
21
LOW SIDE LO
20
HIGH SIDE LO
19
40
IIP2
60
50
10
0
–10
P
OUT
, IM3 (dBm/TONE)
–20
–30
–40
–50
–60
–70
–80
IM3
P
OUT
, IM2 (dBm/TONE)
IIP3 (dBm)
18
IIP3
17
LOW SIDE LO
16
15
–16
HIGH SIDE LO
–12
–8
–4
0
LO INPUT POWER (dBm)
4
U W
12
10
8
6
4
2
0
4
5519 G09
IIP3 and IIP2
vs RF Output Frequency
25
23
HIGH SIDE LO
IIP2
LOW SIDE LO
60
50
–10
LO-RF Leakage
vs RF Output Frequency
–20
IIP2 (dBm)
–30
HIGH SIDE LO
19
17
15
13
500
IIP3
HIGH SIDE LO
30
20
LOW SIDE LO
10
0
1500
5519 G04
–40
LOW SIDE LO
–50
700
900
1100
1300
RF OUTPUT FREQUENCY (MHz)
–60
500
700
1100
1300
900
RF OUTPUT FREQUENCY (MHz)
1500
5519 G05
IIP3 and IIP2 vs
LO Input Power
21
T
A
= –40°C
20
T
A
= 85°C
T
A
= 25°C
IIP2
–20
–30
50
60
0
–10
LO-RF Leakage
vs LO Input Power
T
A
= 85°C
–40
–50
–60
–16
T
A
= 25°C
T
A
= –40°C
–12
–8
–4
0
LO INPUT POWER (dBm)
4
5519 G08
RF Output Power and Output IM3 vs
IF Input Power (Two Input Tones)
10
P
OUT
T
A
= –40°C
T
A
= 85°C
T
A
= 25°C
T
A
= –40°C
T
A
= 85°C
T
A
= 25°C
0
–10
–20
–30
–40
–50
–60
–70
–80
–12
–4
0
–8
IF INPUT POWER (dBm/TONE)
4
5519 G10
RF Output Power and Output IM2 vs
IF Input Power (Two Input Tones)
P
OUT
T
A
= –40°C
T
A
= 85°C
T
A
= 25°C
IIP2 (dBm)
30
20
10
0
T
A
= –40°C
IM2
T
A
= 85°C
T
A
= 25°C
–90
–16
–90
–16
–12
–4
0
–8
IF INPUT POWER (dBm/TONE)
4
5519 G11
5519f
LT5519
TYPICAL PERFOR A CE CHARACTERISTICS
V
CC
= 5V
DC
, EN = High, T
A
= 25°C, IF input = 140MHz at –10dBm, LO input = 1.14GHz at –5dBm, RF output measured at 1000MHz,
unless otherwise noted. For 2-tone inputs: 2nd IF input = 141MHz at –10dBm. (Test Circuit Shown in Figure 2.)
Conversion Gain vs IF Input
Power (One Input Tone)
4
3
2
1
GAIN (dB)
–5
8
HIGH SIDE LO
IIP2
40
30
HIGH SIDE LO
LOW SIDE LO
GAIN
LOW SIDE AND HIGH SIDE LO
4.5
4.75
5
SUPPLY VOLTAGE (V)
5.25
0
5.5
IIP3
20
10
IIP3, IIP2 (dBm)
T
A
= –40°C
RETURN LOSS (dB)
–10
GAIN (dB)
0
–1
–2
–3
–4
–5
–6
–16
–12
T
A
= 25°C
T
A
= 85°C
–4
0
–8
IF INPUT POWER (dBm)
PI FU CTIO S
GND (Pins 1, 4, 9, 12, 13, 16):
Internal Grounds. These
pins are used to improve isolation and are not intended as
DC or RF grounds for the IC. Connect these pins to low
impedance grounds on the PCB for best performance.
IF
+
, IF
–
(Pins 2, 3):
Differential IF Signal Inputs. A differ-
ential signal must be applied to these pins through DC
blocking capacitors. The pins must be connected to ground
with 100Ω resistors (the grounds must each be capable of
sinking about 18mA). For best LO leakage performance,
these pins should be DC isolated from each other. An
impedance transformation is required to match the IF in-
put to the desired source impedance (typically 50Ω or 75Ω).
EN (Pin 5):
Enable Pin. When the applied voltage is greater
than 3V, the IC is enabled. When the applied voltage is less
than 0.5V, the IC is disabled and the DC current drops to
about 1µA.
V
CC1
(Pin 6):
Power Supply Pin for the Bias Circuits.
Typical current consumption is about 2mA. This pin
should be externally connected to V
CC
and have appropri-
ate RF bypass capacitors.
V
CC2
(Pin 7):
Power Supply Pin for the LO Buffer Circuits.
Typical current consumption is about 22mA. This pin
should have appropriate RF bypass capacitors as shown
in Figure 2. The 1000pF capacitor should be located as
close to the pins as possible.
V
CC3
(Pin 8):
Power Supply Pin for the Internal Mixer.
Typical current consumption is about 36mA. This pin
should be externally connected to V
CC
through an induc-
tor. A 39nH inductor is shown in Figure 2, though the value
is not critical.
RF
–
, RF
+
(Pins 10, 11):
Differential RF Outputs. One pin
may be DC connected to a low impedance ground to realize
a 50Ω single-ended output. No external matching compo-
nents are required. A DC voltage should not be applied
across these pins, as they are internally connected through
a transformer winding.
LO
+
, LO
–
(Pins 14, 15):
Differential Local Oscillator In-
puts. The LT5519 works well with a single-ended source
driving the LO
+
pin and the LO
–
pin connected to a low
impedance ground. No external 50Ω matching compo-
nents are required. An internal resistor is connected
across these pins; therefore, a DC voltage should not be
applied across the inputs.
Exposed Pad (Pin 17):
DC and RF ground return for the
entire IC. This must be soldered to the printed circuit board
low impedance ground plane.
5519f
U W
4
5519 G12
IF, LO and RF Port Return Loss
vs Frequency
0
10
Conversion Gain, IIP3 and IIP2
vs Supply Voltage
LOW SIDE LO
60
50
6
4
2
RF PORT
0
–2
0
500
1000
1500
FREQUENCY (MHz)
2000
5519 G13
–15
–20
–25
–30
LO PORT
IF PORT
4
4.25
5519 G14
U
U
U
5
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