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LT5511

High Signal Level Upconverting Mixer

Linear Technology 

LT5511

PI FU CTIO S

LO–, LO+ (Pins 1, 16): Differential Inputs for the Local

Oscillator Signal. They can also be driven single-ended by

connecting one to an RF ground through a DC blocking

capacitor. For single-ended drive, use LO+ for the signal

input, as this results in less interference from unwanted

coupling of the LO signal to other pins. These pins are

internally biased to about 1.4V; thus, DC blocking capaci-

tors are required. An impedance transformation is re-

quired to match the LO input to 50Ω (or 75Ω). At frequen-

cies below 1.5GHz this input can be resistively matched

with a shunt resistor.

NC (Pins 2, 9): Not Connected Internally. Connect to

ground for improved isolation between pins.

GND (Pins 3, 6, 8,11, 14): 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 ground for

best performance.

IF+, IF– (Pins 4, 5): Differential Inputs for the IF Signal. A

differential signal must be applied to these pins. These

pins are internally biased to about 1.2V, and thus require

DC blocking capacitors. These pins should be DC isolated

from each other for best LO suppression. Imbalances in

amplitude or phase between these two signals will de-

grade the linearity of the mixer.

VCCBIAS (Pin 7): Supply Voltage for the LO Buffer Bias and

Enable Circuits. This pin should be connected to VCC and

have appropriate RF bypass capacitors. Care should be

taken to ensure that RF signal leakage to the VCC line is

minimized.

EN (Pin 10): Chip Enable/Disable. When the applied volt-

age 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 1µA. Under no conditions should

the voltage on this pin exceed VCC + 0.3V, even at power

on.

RF–, RF+ (Pins 12, 13): Differential Outputs for the RF

Output Signal. An impedance transformation may be

required to match the outputs. These pins are also used to

connect the mixer to the DC supply through impedance-

matching inductors, RF chokes or transformer center-tap.

Care should be taken to ensure that the RF signal leakage

to VCCLO and VCCBIAS is minimized.

VCCLO (Pin 15): Supply Voltage for the LO Buffer Ampli-

fier. This pin should be connected to VCC and have appro-

priate RF bypass capacitors. Care should be taken to

ensure that RF signal leakage to the VCC line is minimized.

GROUND (Backside Contact) (Pin 17): DC and RF Ground

Return for the Entire IC. This contact must be connected

to a low impedance ground plane for proper operation.

BLOCK DIAGRA

LO–

LO+

1

16

8

NC 2

GND 3

IF+ 4

IF– 5

GND 6

VCCBIAS 7

LO

BUFFER

BIAS

CIRCUITS

8

17

9

GND GND NC

(BACKSIDE)

15 VCCLO

14 GND

13 RF+

12 RF–

11 GND

10 EN

5511 BD

5511f

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