LT5503(RevA) データシートの表示（PDF） - Linear Technology
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LT5503 Datasheet PDF : 22 Pages
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LT5503
Pin Functions
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 signifi-
cant bit of the 4-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 50Ω 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 0.1µF 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 0.1µF 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 50Ω source.
VCCLO1 (Pin 8): Power Supply Pin for the Mixer LO1 Cir-
cuits. 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 network.
MX– (Pin 11): Mixer Negative RF Output Pin. This pin must
be connected to VCC through an external matching network.
MIXEN (Pin 12): Mixer Enable Pin. When the input volt-
age 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 50Ω 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 50Ω.
GC2 (Pin 18): Gain Control Pin. This pin is the most sig-
nificant bit of the 4-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 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.
Exposed Pad (Pin 21): Circuit Ground Return for the En-
tire IC. This must be soldered to the printed circuit board
ground plane.
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