LTC5541IUH データシートの表示（PDF） - Linear Technology

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LTC5541IUH

1.3GHz to 2.3GHz High Dynamic Range Downconverting Mixer

Linear Technology 

LTC5541

PIN FUNCTIONS

NC (Pin 1): This pin is not connected internally. It can be

left floating, connected to ground or to VCC.

RF (Pin 2): Single-Ended Input for the RF Signal. This pin

is internally connected to the primary side of the RF input

transformer, which has low DC resistance to ground. A

series DC-blocking capacitor should be used to avoid

damage to the integrated transformer. The RF input is

impedance matched, as long as the selected LO input is

driven with a 0dBm ±6dB source between 1.4GHz and

2GHz.

CT (Pin 3): RF Transformer Secondary Center-Tap. This

pin may require a bypass capacitor to ground. See the

Applications Information section. This pin has an internally

generated bias voltage of 1.2V. It must be DC-isolated

from ground and VCC.

GND (Pins 4, 10, 12, 13, 17, Exposed Pad Pin 21):

Ground. These pins must be soldered to the RF ground

plane on the circuit board. The exposed pad metal of the

package provides both electrical contact to ground and

good thermal contact to the printed circuit board.

SHDN (Pin 5): Shutdown Pin. When the input voltage is

less than 0.3V, the internal circuits supplied through pins

6, 8, 14, 18 and 19 are enabled. When the input voltage

is greater than 3V, all circuits are disabled. Typical input

current is less than 10μA. This pin must not be allowed

to float.

VCC2 (Pin 6) and VCC1 (Pin 8): Power Supply Pins for

the LO Buffer and Bias Circuits. These pins are internally

connected and must be externally connected to a regulated

3.3V supply, with bypass capacitors located close to the

pin. Typical current consumption is 92mA.

LOBIAS (Pin 7): This Pin Allows Adjustment of the LO

Buffer Current. Typical DC voltage is 2.2V.

LOSEL (Pin 9): LO1/LO2 Select Pin. When the input voltage

is less than 0.3V, the LO1 port is selected. When the input

voltage is greater than 3V, the LO2 port is selected. Typical

input current is 11μA for LOSEL = 3.3V. This pin must not

be allowed to float.

LO1 (Pin 11) and LO2 (Pin 15): Single-Ended Inputs for

the Local Oscillators. These pins are internally biased

at 0V and require external DC blocking capacitors. Both

inputs are internally matched to 50Ω, even when the chip

is disabled (SHDN = high).

VCC3 (Pin 14): Power Supply Pin for the LO Switch. This

pin must be connected to a regulated 3.3V supply and

bypassed to ground with a capacitor near the pin. Typical

DC current consumption is less than 100μA.

IFGND (Pin 16): DC Ground Return for the IF Amplifier.

This pin must be connected to ground to complete the

IF amplifier’s DC current path. Typical DC current is

100mA.

IF– (Pin 18) and IF+ (Pin 19): Open-Collector Differential

Outputs for the IF Amplifier. These pins must be connected

to a DC supply through impedance matching inductors, or

a transformer center-tap. Typical DC current consumption

is 50mA into each pin.

IFBIAS(Pin20):ThisPinAllowsAdjustmentoftheIFAmplifier

Current. Typical DC voltage is 2.1V.

5541f

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