lt5522 Linear Technology Corporation, lt5522 Datasheet - Page 8

• Manufacturer Part Number: lt5522
• Description: 600mhz To 2.7ghz High Signal Level Downconverting Mixer
• Manufacturer: Linear Technology Corporation

PI FU CTIO S
BLOCK DIAGRA
LT5522
NC (Pins 1, 4, 8, 13, 16): Not Connected Internally. These
pins should be grounded on the circuit board for improved
LO to RF and LO to IF isolation.
RF
The RF input signal should be applied to the RF
3) and the RF
These pins are the primary side of the RF input balun which
has low DC resistance. If the RF source is not DC blocked,
then a series blocking capacitor must be used.
EN (Pin 5): Enable Pin. When the input enable voltage is
higher than 3V, the mixer circuits supplied through Pins 6,
7, 10 and 11 are enabled. When the input enable voltage is
less than 0.3V, all circuits are disabled. Typical input EN pin
current is 55µA for EN = 5V and 0µA when EN = 0V. The EN
pin should not be left floating. Under no conditions should
the EN pin voltage exceed V
V
Typical current consumption is 22mA. This pin should be
externally connected to the V
0.01µF and 3.3µF capacitors.
V
Typical current consumption is 4mA. This pin should be
8
CC1
CC2
U
+
, RF
(Pin 6): Power Supply Pin for the LO Buffer Circuits.
(Pin 7): Power Supply Pin for the Bias Circuits.
–
(Pins 2, 3): Differential Inputs for the RF Signal.
U
+
pin (Pin 2) must be connected to ground.
U
15
14
W
2
3
CC
RF
RF
LO
LO
CC2
+
–
+
–
+ 0.3V, even at start-up.
pin and decoupled with
6
V
CC1
AMPLIFIER
–
LINEAR
HIGH SPEED
LO BUFFER
pin (Pin
EXPOSED
PAD
17
externally connected to the V
0.01µF and 3.3µF capacitors.
GND (Pins 9, 12): Ground. These pins are internally
connected to the backside ground for improved isolation.
They should be connected to RF ground on the circuit
board, although they are not intended to replace the
primary grounding through the backside contact of the
package.
IF
Signal. An impedance transformation may be required to
match the outputs. These pins must be connected to V
through impedance matching inductors, RF chokes or a
transformer center-tap.
LO
Oscillator Signal. The LO input can also be driven single
ended by connecting one input to ground. These pins are
internally matched for 50Ω single-ended operation. If the
LO source is not AC-coupled, then a series blocking
capacitor must be used.
Exposed Pad (Pin 17): Circuit Ground Return for the
Entire IC. This must be soldered to the printed circuit board
ground plane.
DOUBLE BALANCED
–
–
, IF
, LO
LIMITER
MIXER
+
+
(Pins 10, 11): Differential Outputs for the IF
(Pins 14, 15): Differential Inputs for the Local
BIAS
7
V
GND
GND
CC2
IF
IF
EN
5522 BD
+
–
12
11
10
9
5
CC1
pin and decoupled with
5522fa
CC