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LT5503

PI FU CTIO S

BQ– (Pin 1): Negative Baseband Input Pin of the Modulator

Q-Channel. This pin is internally biased to 1.4V, but can

also be overdriven with an external DC voltage greater than

1.4V, but less than VCC – 0.4V.

BQ+ (Pin 2): Positive Baseband Input Pin of Modulator Q-

Channel. This pin is internally biased to 1.4V, but can also

be overdriven with an external DC voltage greater than

1.4V, but less than VCC – 0.4V.

GC1 (Pin 3): Gain Control Pin. This pin is the least

significant bit of the four-step modulator gain control.

MODIN (Pin 4): Modulator Carrier Input Pin. This pin is

internally biased and should be AC-coupled. An external

matching network is required for a 50

Ω source.

VCCMOD (Pin 5): Power Supply Pin for the I/Q Modulator.

This pin should be externally connected to the other VCC

pins and decoupled with 1000pF and 0.1

µF capacitors.

VCCRF (Pin 6): Power Supply Pin for the I/Q Modulator

Input RF Buffer and Phase Shifter. This pin should be

externally connected to the other VCC pins and decoupled

with 1000pF and 0.1

µF capacitors.

LO1 (Pin 7): Mixer 1st LO Input Pin. This pin is internally

biased and should be AC-coupled. An external matching

network is required for a 50

Ω source.

VCCLO1 (Pin 8): Power Supply Pin for the Mixer LO1

Circuits. This pin should be externally connected to the

other VCC pins and decoupled with 1000pF and 0.1µF

capacitors.

DMODE (Pin 9): Mixer 2nd LO Divider Mode Control Pin.

Low = divide-by-2, High = divide-by-1.

MX+ (Pin 10): Mixer Positive RF Output Pin. This pin must

be connected to VCC through an external matching net-

work.

MX– (Pin 11): Mixer Negative RF Output Pin. This pin must

be connected to VCC through an external matching net-

work.

MIXEN (Pin 12): Mixer Enable Pin. When the input voltage

is higher than VCC – 0.4V, the mixer circuits supplied

through pins 8, 10, 11 and 15 are enabled. When the input

voltage is less than 0.4V, these circuits are disabled.

MODEN (Pin 13): Modulator Enable Pin. When the input

voltage is higher than VCC – 0.4V, the modulator circuits

supplied through pins 5, 6, 16 and 17 are enabled. When

the input voltage is less than 0.4V, these circuits are

disabled.

LO2 (Pin 14): Mixer 2nd LO Input Pin. This pin is internally

biased and should be AC-coupled. An external matching

network is not required, but can be used for improved

matching to a 50

Ω source.

VCCLO2 (Pin 15): Power Supply Pin for the Mixer LO2

Circuits. This pin should be externally connected to the

other VCC pins and decoupled with 1000pF and 0.1µF

capacitors.

VCCVGA (Pin 16): Power Supply Pin for the Modulator

Variable Gain Amplifier. This pin should be externally

connected to the other VCC pins through a 47Ω resistor

and decoupled with a good high frequency capacitor (2pF

typical) placed close to the pin.

MODOUT (Pin 17): Modulator RF Output Pin. This pin

must be externally biased to VCC through a bias choke. An

external matching network is required to match to 50

Ω.

GC2 (Pin 18): Gain Control Pin. This pin is the most

significant bit of the four-step modulator gain control.

BI+ (Pin 19): Positive Baseband Input Pin of the Modulator

I-Channel. This pin is internally biased to 1.4V, but can also

be overdriven with an external DC voltage greater than

1.4V, but less than VCC – 0.4V.

BI– (Pin 20): Negative Baseband Input Pin of the Modula-

tor I-Channel. This pin is internally biased to 1.4V, but can

also be overdriven with an external DC voltage greater than

1.4V, but less than VCC – 0.4V.

GROUND (Backside Contact): Circuit Ground Return for

the Entire IC.

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