LT5502 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT5502 Datasheet PDF : 12 Pages
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LT5502
PI FU CTIO S
IOUT+ (Pin 1): Positive Baseband Output Pin of I-Channel.
The DC bias voltage is VCC – 1.16V. This pin should not be
shorted to ground.
IOUT– (Pin 2): Negative Baseband Input Pin of I-Channel.
The DC bias voltage is VCC – 1.16V. This pin should not be
shorted to ground.
GND (Pins 3, 5, 8, 9, 14, 20, 21): Ground Pin.
VCC (Pins 4, 16, 17, 22): Power Supply Pin. This pin
should be decoupled using 1000pF and 0.1µF capacitors.
IF+ (Pin 6): Positive IF Input Pin. The DC bias voltage is
VCC – 0.4V.
IF– (Pin 7): Negative IF Input Pin. The DC bias voltage is
VCC – 0.4V.
EN (Pin 10): Enable Pin. When the input voltage is higher
than 0.9V or up to VCC, the circuit is completely turned on.
When the input voltage is less than 0.7V or down to
ground, the circuit is turned off except the part of the
circuit associated with standby mode.
STBY (Pin 11): Standby Pin. When the input voltage is
higher than 0.9V or up to VCC, the circuit of standby mode
is turned on to bias the I/Q buffers to desired quiescent
voltage. When the input voltage is less than 0.7V or down
to ground, it is turned off.
IFt+ (Pin 12): Interstage IF Positive Pin. The DC bias
voltage is VCC – 0.25V.
IFt– (Pin 13): Interstage IF Negative Pin. The DC bias
voltage is VCC – 0.25V.
RSSI (Pin 15): RSSI Output Pin.
2XLO– (Pin 18): Negative Carrier Input Pin. The input-
signal’s frequency must be twice that of the desired
demodulator LO frequency. The DC bias voltage is VCC –
0.4V.
2XLO+ (Pin 19): Positive Carrier Input Pin. The input-
signal’s frequency must be twice that of the desired
demodulator LO frequency. The DC bias voltage is VCC –
0.4V.
QOUT– (Pin 23): Negative Baseband Output Pin of the
Q-Channel. The DC bias voltage is VCC – 1.16V. This pin
should not be shorted to ground.
QOUT+ (Pin 24): Positive Baseband Output Pin of the
Q-Channel. The DC bias voltage is VCC – 1.16V. This pin
should not be shorted to ground.
BLOCK DIAGRA
IFt+ IFt–
12 13
IF+ 6
IF– 7
LIMITER
1
LIMITER
2
RSSI
15
RSSI
I-MIXER
LPF
1
LO
DIVIDE 2
BUFFERS
0°/90°
LPF
1
Q-MIXER
BIAS
19 18
10
2XLO+ 2XLO–
EN
1 IOUT+
2 IOUT–
24 QOUT+
23 QOUT–
5502 BD
5
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