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LTC5505 Datasheet

  • LTC5505

  • Linear Technology [40MHz to 900MHz Quadrature Demodulator]

  • LINER

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LT5517
TYPICAL PERFOR A CE CHARACTERISTICS
f
RF
= 800MHz, P
2XLO
= 鈥?0dBm, unless otherwise noted. (Test circuit shown in Figure 2)
RF-LO Isolation
vs RF Input Power
120
110
RF-LO ISOLATION (dB)
6
f
RF
= 40MHz
CONV GAIN (dB)
90
80
f
RF
= 400MHz
70
f
RF
= 800MHz
60
T
A
= 25擄C
V
CC
= 5V
鈥?0
鈥?
0
5
10
5517 G13
2
RETURN LOSS (dB)
100
50
鈥?5
RF INPUT POWER (dBm)
PI FU CTIO S
GNDRF (Pins 1, 4):
Ground Pins for RF Termination.
These pins are not internally connected, and should be
connected to the PCB ground plane for best RF isolation.
RF
+
, RF
鈥?/div>
(Pins 2, 3):
Differential RF Input Pins. These pins
are internally biased to 2.30V. These two pins should be
DC blocked when connected to ground or other matching
components. The inputs can be terminated in a single-
ended configuration, but differential input drive is pre-
ferred for best performance. An external matching network
is required for impedance transformation.
EN (Pin 5):
Enable Pin. When the input voltage is higher
than 1.6V, the circuit is completely turned on. When the
input voltage is less than 1.3V, the circuit is turned off.
V
CC
(Pins 6, 7, 8, 12):
Power Supply Pins. These pins
should be decoupled using 1000pF and 0.1碌F capacitors.
GND (Pins 9, 11):
Ground Pins. These pins are internally
tied together and to the Exposed Pad. They should be
connected to the PCB ground plane.
2XLO (Pin 10):
2XLO Input Pin. This pin is internally
biased to 1V. The input signal鈥檚 frequency should be twice
that of the desired demodulator LO frequency. The pin
should be AC coupled with an external DC blocking
capacitor.
Q
OUT鈥?/div>
, Q
OUT+
(Pins 13, 14):
Differential Baseband Output
Pins of the Q-Channel. The internal DC bias voltage is
V
CC
鈥?0.78V for each pin.
I
OUT鈥?/div>
, I
OUT+
(Pins 15, 16):
Differential Baseband Output
Pins of the I-Channel. The internal DC bias voltage is
V
CC
鈥?0.78V for each pin.
Exposed Pad (Pin 17):
Ground Return for the Entire IC.
This pin must be soldered to the printed circuit board
ground plane.
U W
Conv Gain
vs Baseband Frequency
f
2XLO
= 1602MHz
V
CC
= 5V
T
A
= 鈥?0擄C
RF, 2XLO Port Return Loss
vs Frequency
0
4
鈥?
T
A
= 25擄C
T
A
= 85擄C
鈥?0
RF
鈥?5
LO
鈥?0
0
鈥?
鈥?
0.1
1
10
100
BASEBAND FREQUENCY (MHz)
1000
5517 G14
鈥?5
0
0.40
1.20
1.60
0.80
FREQUENCY (GHz)
2
5517 G15
U
U
U
5517f
5

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