TK14588V/14588 데이터 시트보기 (PDF) - Toko America Inc

부품명

상세내역

제조사

TK14588V/14588

FM IF IC

Toko America Inc  

CIRCUIT DESCRIPTION (CONT.)

Vref

I to V convertor

io

Demodulated

Output Current

VB

R1

C1 Demodulated

Output Voltage

VOUT

TK14588

Demodulated Output Voltage VOUT = VB ± R1 x io

Demodulated Bandwidth

Fc =

1

2 π C1(1/gm)

1/gm is about 50 kΩ that is the output resistance of the

multiplier.

Pin 11 is disconnected.

FIGURE 8 - EXAMPLE OF USING EXTERNAL REFERENCE SOURCE

VCC

R1

R2

C1

R1 = R2

Demodulated

Output Voltage

VOUT

Demodulated Output Voltage VOUT = VCC/2 ± R1 x io

Demodulated Bandwidth

Fc

=

2

π

1

C1(1/gm)

1/gm is about 50 kΩ that is the output resistance of the

multiplier.

Pin 11 is disconnected.

FIGURE 9 - EXAMPLE OF DIVIDING SUPPLY VOLTAGE INTO HALVES BY THE RESISTORS

Comparator:

The TK14588V contains a general purpose high-speed data comparator for the base band processing. Because the input

stage is composed of PNP transistors, it is possible to operate from a minimum voltage of 0.2 V to the supply voltage minus

0.9 V (see Figure 10).

Moreover, as the HFE of this PNP transistor is over 100, the bias current is below 0.01 µA (this is below 10% of the value

of the general products on the market using lateral PNP transistor at input stage).

INPUT STAGE

FIGURE 10 - COMPARATOR INPUT STAGE

January 2000 TOKO, Inc.

Page 17

Share Link: