MC13145FTA Ver la hoja de datos (PDF) - LANSDALE Semiconductor Inc.

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Fabricante

MC13145FTA

UHF Wideband Receiver Subsystem (LNA, Mixer, VCO, rescaler, IF Subsystem, Coiless Detector)

LANSDALE Semiconductor Inc. 

LANSDALE Semiconductor, Inc.

ML13145

Pin

32, 34

Symbol/Type

VEE

33

LO2

35

IF2+

36

IF2–

Description

V CC

LO Out+

LO Out–

(to Mxr2)

33

LO2

390 µA

32

V EE

35

IF2+

34

V EE

36

IF2–

Description

VEE, Negative Supply Voltage

2nd Local Oscillator

The 2nd LO input impedance is broadband 50 Ω; it

is driven from an external 50 Ω source. Typical level

is –15 to –10 dBm.

2nd Mixer Outputs

The Mixer is a differential open collector

configuration.

37

VEE

See Figure 4.

38

IF In

39, 40

41

42

7

IF Dec1,

IF Dec2

IF Out

VCC

RSSI

VEE, Negative Supply Voltage

IF Amplifier Input

IF amplifier input source impedance is 330 Ω.. The

three stage amplifier has 40 dB of gain with 3.0 dB

bandwidth of 40 MHz.

IF Decoupling

These pins are decoupled to VCC to provide stable

operation of the limiting IF amplifier.

IF Amplifier Output

IF amplifier output load impedance is 330 Ω.

VCC, Positive Supply Voltage

RSSI

The RSSI circuitry in the 2nd & 3rd amplifier stages

outputs a current when the output of the previous

stage enters limiting. The net result is a RSSI

current which represents the logarithm of the IF

input voltage. An external resistor to ground is used

to provide a voltage output.

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