TK14584M/584 데이터 시트보기 (PDF) - Toko America Inc
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TK14584M/584 Datasheet PDF : 20 Pages
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TK14584
CIRCUIT DESCRIPTION (CONT.)
Vref
I to V convertor
io
Demodulated
Output Current
VB
R1
C1 Demodulated
Output Voltage
VOUT
Demodulated Output Voltage VOUT = VB ± R1 x io
Demodulated Bandwidth
Fc
=
2
π
1
C1(1/gm)
1/gm is approximately 50 kΩ which is the output
resistance of the multiplier.
Pin 7 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
Fc =
1
Demodulated Bandwidth
2 π C1(1/gm)
1/gm is approximately 50 kΩ which is the output
resistance of the multiplier.
Pin 7 is disconnected.
FIGURE 9 - EXAMPLE OF DIVIDING SUPPLY VOLTAGE INTO HALVES BY THE RESISTORS
Power Save Function:
Pin 5 is the control terminal for the battery save function. The ON/OFF operation of the whole IC can be switched by
controlling the DC voltage at this terminal. Figure 10 shows the internal equivalent circuit of Pin 5.
Because it switches the bias circuit of the entire IC by using the transistor in standby mode, it reduces the supply current
to near zero. As the input terminal is connected with an electrostatic discharge protection diode at GND side only, it is
possible to control the voltage above the supply voltage. It is possible to go into standby mode by disconnecting Pin 5,
but it is not recommended because Pin 5 is a high impedance and may malfunction by an external disturbance.
When Pin 5 is disconnected, a suitable capacitor should be connected between Pin 5 and GND.
VCC
BIAS
50 K
Vs
Page 18
FIGURE 10
January 2000 TOKO, Inc.
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