TK14551V Ver la hoja de datos (PDF) - Toko America Inc

Número de pieza

componentes Descripción

Fabricante

TK14551V

FM IF DETECTOR/AMPLIFIER

Toko America Inc  

TK14551V

CIRCUIT DESCRIPTION

Figure 4 shows the AM demodulated waveform.

RSSI-OUT (V)

Operating Condition:

V = 3 V, fin = 40 MHz,

CC

fm = 2 MHz, Mod = ±80%,

VIN = -40 dBm

50 mV/div

0.2 µs/div

AM can be

demodulated

inside of linear

range

RF INPUT - LEVEL (dBu)

FIGURE 4 -AM DEMODULATED WAVEFORM

If it is necessary to improve the distortion of the AM demodulated waveform of logarithmic detection, connect a low pass

filter to the RSSI buffer amplifier output. Figure 5 shows the AM demodulated waveform with a low pass filter inserted.

Operating Condition:

VCC = 3 V, fin = 40 MHz,

fm = 2 MHz, Mod = ±80%,

V = -40 dBm

IN

50 mV/div

0.2 µs/div

FIGURE 5

TEST CIRCUIT

3k C

33 pF

3k

10 pF

2.2 k 2.2 k

15 pF

fc = 3 MHz

1k

COMP VCC

Page 22

January 2000 TOKO, Inc.

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