lt5519 Linear Technology Corporation, lt5519 Datasheet - Page 5

• Manufacturer Part Number: lt5519
• Description: 0.7ghz To 1.4ghz High Linearity Upconverting Mixer
• Manufacturer: Linear Technology Corporation

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
ential signal must be applied to these pins through DC
blocking capacitors. The pins must be connected to ground
with 100 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 50 or 75 ).
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 1 A.
V
Typical current consumption is about 2mA. This pin
should be externally connected to V
ate RF bypass capacitors.
V
Typical current consumption is about 22mA. This pin
should have appropriate RF bypass capacitors as shown
V
unless otherwise noted. For 2-tone inputs: 2nd IF input = 141MHz at –10dBm. (Test Circuit Shown in Figure 2.)
TYPICAL PERFOR A CE CHARACTERISTICS
CC
CC1
CC2
+
U
, IF
–1
–2
–3
–4
–5
–6
= 5V
4
3
2
1
0
–16
(Pin 7): Power Supply Pin for the LO Buffer Circuits.
Conversion Gain vs IF Input
Power (One Input Tone)
(Pin 6): Power Supply Pin for the Bias Circuits.
–
DC
(Pins 2, 3): Differential IF Signal Inputs. A differ-
, EN = High, T
U
–12
IF INPUT POWER (dBm)
–8
T
T
T
A
A
A
= –40 C
= 25 C
= 85 C
U
A
–4
= 25 C, IF input = 140MHz at –10dBm, LO input = 1.14GHz at –5dBm, RF output measured at 1000MHz,
W
0
5519 G12
U
4
CC
and have appropri-
–10
–15
–20
–25
–30
–5
0
0
IF, LO and RF Port Return Loss
vs Frequency
IF PORT
LO PORT
500
FREQUENCY (MHz)
1000
in Figure 2. The 1000pF capacitor should be located as
close to the pins as possible.
V
Typical current consumption is about 36mA. This pin
should be externally connected to V
tor. A 39nH inductor is shown in Figure 2, though the value
is not critical.
RF
may be DC connected to a low impedance ground to realize
a 50 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
puts. The LT5519 works well with a single-ended source
driving the LO
impedance ground. No external 50
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.
CC3
RF PORT
+
–
, LO
, RF
1500
(Pin 8): Power Supply Pin for the Internal Mixer.
+
–
5519 G13
(Pins 10, 11): Differential RF Outputs. One pin
(Pins 14, 15): Differential Local Oscillator In-
2000
+
pin and the LO
10
–2
8
6
4
2
0
Conversion Gain, IIP3 and IIP2
vs Supply Voltage
4
GAIN
4.25
LOW SIDE AND HIGH SIDE LO
SUPPLY VOLTAGE (V)
4.5
–
HIGH SIDE LO
HIGH SIDE LO
LOW SIDE LO
LOW SIDE LO
pin connected to a low
4.75
CC
matching compo-
through an induc-
5
LT5519
5.25
5519 G14
IIP2
IIP3
5.5
60
50
10
0
40
30
20
5
5519f