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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 0.1

µF 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

2XLO+

2XLO–

IF+

IF–

BIAS

5502 BD

LIMITER

RSSI

BUFFERS

IFt+

IFt–

IOUT

–

QOUT

–

Q-MIXER

I-MIXER

LPF

DIVIDE 2

°/90°

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