ML13145 datasheet(10/17 Pages) LANSDALE

No de pièce	ML13145

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

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Fabricant	LANSDALE [LANSDALE Semiconductor Inc.]

Site Internet	http://www.lansdale.com

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LANSDALE Semiconductor, Inc.

ML13145

Figure 4. IF Amplifier Functional Diagram

IF Dec1

39

IF In

38

IF Dec2

40

IF Out

41

Σ

RSSI

Symbol/Type

Description

43

VCC

See Figure 5.

VCC, Positive Supply Voltage

44

Lim In

Limiting Amplifier Input

Limiting amplifier input source impedance is 330

Ω.

This amplifier has 84 dB of gain with 3.0 dB

bandwidth of 40 MHz; this enables the IF and

limiting ampliers chain to hard limit on noise.

45, 46

Lim Dec1,

Lim Dec2

If Decoupling

These pins are decoupled to VCC to provide stable

operation of the 2nd IF limiting amplifier.

7

RSSI

The RSSI circuitry in the 2nd, 3rd, & 4th 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.

Figure 5. Limiter Amplifier Functional Diagram

Lim Dec1

45

Lim In

44

Lim Dec2

46

RSSI

7

Σ

Lim+

Lim–

Demod

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