lt5578 MOSA electronics corp., lt5578 Datasheet - Page 8

• Manufacturer Part Number: lt5578
• Description: 0.4ghz To 2.7ghz High Linearity Upconverting Mixer
• Manufacturer: MOSA electronics corp.

PIN FUNCTIONS
GND (Pins 1, 2, 5-7, 12-14, 16-21, 23, 24): Ground
Connections. These pins are internally connected to the
exposed pad and should be soldered to a low impedance
RF ground on the printed circuit board.
IF
mode voltage on these pins is set internally to 565mV. The
DC current from each pin is determined by the value of
an external resistor to ground. The maximum DC current
through each pin is 45mA.
V
pins are connected together internally. Typical current
consumption is 152mA. These pins should be connected
together on the circuit board with external bypass capaci-
tors of 1000pF , 100pF and 10pF located as close to the
pins as possible.
LT5578
BLOCK DIAGRAM
8
CC
+
, IF
(Pins 8-11): Power Supply Pins for the IC. These
–
(Pins 3, 4): Differential IF Input. The common
22
GND PINS ARE NOT SHOWN
LO
V
CC2
LO BUFFER
CTRL
V
CM
25
EXPOSED
PAD
RF (Pin 15): Single-Ended RF Output. This pin is con-
nected to an internal transformer winding. The opposite
end of the winding is grounded internally. An impedance
transformation may be required to match the output and a
DC decoupling capacitor is required if the following stage
has a DC bias voltage present.
LO (Pin 22): Single-Ended Local Oscillator Input. An internal
series capacitor acts as a DC block to this pin.
Exposed Pad (Pin 25): PGND. Electrical and thermal
ground connection for the entire IC. This pad must be
soldered to a low impedance RF ground on the printed
circuit board. This ground must also provide a path for
thermal dissipation.
3
IF
+
15
4
RF
IF
BALANCED
DOUBLE
–
MIXER
BIAS
V
CC2
V
V
V
V
CC
CC
CC
CC
5578 BD
11
10
9
8
5578f