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LT5526EUF

High Linearity, Low Power Downconverting Mixer

Linear Technology 

LT5526

PI FU CTIO S

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+, RF– (Pins 2, 3): Differential Inputs for the RF Signal.

These pins must be driven with a differential signal. Each

pin must also be connected to a DC ground capable of

sinking 7.5mA (15mA total). This DC bias return can be

accomplished through the center-tap of a balun or with

shunt inductors. An impedance transformation is required

to match the RF input to 50Ω (or 75Ω).

EN (Pin 5): Enable Pin. When the input voltage is higher

than 3V, the mixer circuits supplied through Pins 6, 7, 10

and 11 are enabled. When the input voltage is less than

0.3V, all circuits are disabled. Typical enable pin input

current is 55µA for EN = 5V and 0.01µA when EN = 0V.

VCC1 (Pin 6): Power Supply Pin for the LO Buffer Circuits.

Typical current consumption is 11mA. This pin should be

externally connected to the other VCC pins and decoupled

with 100pF and 0.01µF capacitors.

VCC2 (Pin 7): Power Supply Pin for the Bias Circuits.

Typical current consumption is 2.5mA. This pin should be

externally connected to the other VCC pins and decoupled

with 100pF and 0.01µF capacitors.

GND (Pins 9, 12): Ground. These pins are internally

connected to the Exposed Pad for better isolation. They

should be connected to ground on the circuit board,

though they are not intended to replace the primary

grounding through the Exposed Pad of the package.

IF– and IF+ (Pins 10, 11): Differential Outputs for the IF

Signal. An impedance transformation may be required to

match the outputs. These pins must be connected to VCC

through impedance matching inductors, RF chokes or a

transformer center-tap.

LO–, LO+ (Pins 14, 15): Differential Inputs for the Local

Oscillator Signal. The LO input is internally matched to

50Ω; however, external DC blocking capacitors are re-

quired because these pins are internally biased to approxi-

mately 1.7V DC. Either LO input can be driven with a

single-ended source while connecting the unused input to

ground through a DC blocking capacitor.

Exposed Pad (Pin 17): Circuit Ground Return for the

Entire IC. This must be soldered to the printed circuit board

ground plane.

BLOCK DIAGRA

17

EXPOSED

PAD

15 14

LO+

LO–

2 RF+

3 RF–

LINEAR

AMPLIFIER

HIGH

SPEED

LO BUFFER

DOUBLE-

BALANCED

MIXER

BIAS

EN

VCC2

5

7

VCC1

6

GND

12

IF+

11

IF–

10

GND

9

5526 BD

5526f

7

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