TK14588V 데이터 시트보기 (PDF) - Toko America Inc

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TK14588V

FM IF IC

Toko America Inc  

CIRCUIT DESCRIPTION

GND

TK14588

-

+

AMP

COMP

VCC

IF Limiter Amplifier, RSSI:

The IF limiter amplifier is composed of five differential gain stages. The total gain of the IF limiter amplifier is 80 dB. The

output signal of the IF limiter amplifier is provided at Pin 14 through the emitter-follower output stage. The IF limiter amplifier

output level is 0.5 V .

P-P

The input resistance of the IF limiter amplifier is 1.8 kΩ (see Figure 1A). If the impedance of the filter is lower than 1.8

kΩ, connect an external resistor between Pin 1 and Pin 2 in parallel to provide the equivalent load impedance of the filter.

Figure 1A shows the case that the impedance of the filter is 330 Ω.

The operating current of the emitter-follower of the IF limiter amplifier output is 200 µA. If the capacitive load is heavy, the

negative half cycle of the output waveform may be distorted. This distortion can be reduced by connecting an external

resistor between Pin 14 to GND to increase the operating current. The increased operating current by an external resistor

is calculated as follows (see Figure 1B):

The

increased

operating

current

I

e

(mA)

=

(V

CC

-

1.0)

/

R

e

(kΩ)

330

1.8 K

FIGURE 1A

VCC

100 kΩ

IF OUTPUT

Re

Ie

FIGURE 1B

January 2000 TOKO, Inc.

Page 13

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