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LT5525EUF

High Linearity, Low Power Downconverting Mixer

Linear Technology 

LT5525

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.

One RF input pin may be DC connected to a low impedance

ground to realize a 50Ω single-ended input at the other RF

pin. No external matching components are required. A DC

voltage should not be applied across these pins, as they

are internally connected through a transformer winding.

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 0.1µA 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 1µF 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 1µF 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. The LO can be driven with a single-ended source

through either LO input pin, with the other LO input pin

connected to ground. There is an internal DC resistance

across these pins of approximately 480Ω. Thus, a DC

blocking capacitor should be used if the signal source has

a DC voltage present.

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

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

ground plane.

BLOCK DIAGRA

6

17

EXPOSED

PAD

15 14

LO+

LO–

RF+

2

LINEAR

AMPLIFIER

HIGH

SPEED

LO BUFFER

RF –

3

DOUBLE-

BALANCED

MIXER

BIAS

EN

VCC2

5

7

VCC1

6

GND

12

IF+

11

IF–

10

GND

9

5525 BD

5525f

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