LT5546 データシートの表示（PDF） - Linear Technology
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LT5546 Datasheet PDF : 12 Pages
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LT5546
TYPICAL PERFOR A CE CHARACTERISTICS VCC = 3V, f2×LO = 570MHz, P2×LO = –5dBm
(Note 5), fIF = 284MHz, PIF = –30dBm, I and Q outputs 800mVP-P into 4kΩ differential load, TA = 25°C, EN = VCC, STBY = VCC,
unless otherwise noted. (Note 3)
IF Detector Output Voltage
vs IF Input CW Power and
Supply Voltage
1.4
fIF = 280MHz
1.2
5.25V
1.0
3V
1.8V
0.8
0.6
0.4
0.2
–40
–30 –20 –10
0
10
IF INPUT CW POWER (dBm)
5546 G16
IF Detector Output Voltage vs IF
Input CW Power and IF Frequency
1.4
VCC = 3V
fIF = 500MHz
1.2
fIF = 280MHz
1.0
0.8
fIF = 40MHz
0.6
0.4
0.2
–40
–30 –20 –10
0
10
IF INPUT CW POWER (dBm)
5546 G17
Phase Relation Between I and Q
Outputs vs LO Input Power
95
fIF = 284MHz, 25°C
94
fIF = 284MHz, –40°C
fIF = 284MHz, 85°C
fIF = 40MHz, 25°C
93
fIF = 500MHz, 25°C
92
91
90
89
VCC = 3V
88
–20 –15 –10 –5 0 5 10
LO INPUT POWER (dBm)
5546 G18
PI FU CTIO S
GND (Pins 1, 4 and 17): Ground. Pins 1 and 4 are
connected to each other internally. The exposed pad (Pin
17) is not connected internally to Pins 1 and 4. For chip
functionality, the exposed pad and either Pin 1 or Pin 4
must be connected to ground. For best RF performance,
Pin 1, Pin␣ 4 and the exposed pad should be connected to
RF ground.
IF+, IF– (Pins 2, 3): Differential Inputs for the IF Signal.
Each pin must be DC grounded through an external
inductor or RF transformer with central ground tap. This
path should have a DC resistance lower than 2Ω to ground.
VCC (Pins 5 and 8): Power Supply. These pins should be
decoupled to ground using 1000pF and 0.1µF capacitors.
VCTRL (Pin 6): VGA Gain Control Input. This pin controls
the IF gain and its typical input voltage range is 0.2V to
1.7V. It is internally biased via a 25k resistor to 0.2V,
setting a low gain if the VCTRL pin is left floating.
IF DET (Pin 7): IF Detector Output. For strong IF input
signals, the DC level at this pin is a function of the IF input
signal level.
EN (Pin 9): Enable Input. When the enable pin voltage is
higher than 1V, the IC is completely turned on. When the
input voltage is less than 0.5V, the IC is turned off, except
the part of the circuit associated with standby mode.
2xLO–, 2xLO+ (Pins 10, 11): Differential Inputs for the
2xLO Input. The 2xLO input frequency must be twice that
of the IF frequency. The internal bias voltage is VCC – 0.4V.
STBY (Pin 12): Standby Input. When the STBY pin is
higher than 1V, the standby mode circuit is turned on to
prebias the I/Q buffers. When the STBY pin is less than
0.5V, the standby mode circuit is turned off.
QOUT–, QOUT+ (Pins 13, 14): Differential Baseband Out-
puts of the Q Channel. Internally biased at VCC – 1.19V.
IOUT–, IOUT+ (Pins 15, 16): Differential Baseband Outputs
of the I Channel. Internally biased at VCC – 1.19V.
5546f
6
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