TA2160FNG

2004-05-11

9

iv

v

HPF

of middle or high frequency range should be set to 10dB or more.

(3)

Treble boost function

This function is realized by using the PW NF terminal. For details, please refer to application note.

3.

Total

(1)

Changeover of power amplifier output DC voltage at 3 V set.

The output DC voltage of the power amplifier is raised by the resistance connected between the RF

In case of 3 V set, the dynamic range spreads.

(2)

Switch

(a) Switch terminal

The current flows through each terminal, in case that these terminals are connected with H

level independently, evevn though the IC off mode.

It is necessary to connect an external pull-down resistor with each terminal in case that IC is

turned on due to external noise etc. The sensitivity of each switch is set up highly.

(b) Pop noise

It is advised to connect R and C with each switch, to reduce the pop noise in switchover (see

Fig.1). It is better that the constants are R = 100 kΩ ,C = 1 µF. As for the constants, select the

optimum one depending on each a set carefully.

0

10 k

0

2

4

6

8

10

12

0.5

1

1.5

2

2.5

VCC = 3 V

VREF

PW OUT

ICCQ

20 k

50 k

100 k

200 k

500 k

1 M

Resistance (PIN 26 – PIN 27)

R

(Ω)

Figure 5

Adjutment of output DC voltage

R

C

Figure 6

Pop noise