TA2145AF View Datasheet(PDF) - Toshiba

Part Name

Description

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TA2145AF

TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic

Toshiba 

TA2145AF

Application Note

· VCC and GND

This IC has two VCC terminals and three GND terminals. Pattern layout should be designed carefully to

reduce the common impedance.

· VCC

VCC (pin 17) ----------------- Preamplifier stage and power amplifier stage.

GVN VCC (pin 16) --------- Motor governor stage.

· GND

PRE GND (pin 1)------------Preamplifier stage, and power amplifier stage except for the power drive stage.

PW GND (pin 11) -----------Power drive stage of power amplifier.

GVN GND (pin 12) ---------Motor governor stage.

· VREF

It is necessary to stabilize the VREF circuit, because the internal circuit operate on this reference.

· RF IN

As this terminal is an input terminal of the ripple filter, it cannot supply a power supply to other ICs etc.

· Preamplifier

Input signal should be applied to VREF standard, otherwise pop noise become bigger when VCC is turned on

and off.

· Power amplifier

It is necessary to insert the coupling capacitor through the PW IN terminal. In case that DC current or DC

voltage is applied to the PW IN terminal, the internal circuit has unbalance and the power amplifier doesn’t

operate normally.

· Operating supply voltage range of motor governor stage

As for the minimum of operating supply voltage range, the motor voltage is 1.8 V.

In case that it is more than 1.8 V, the low voltage performance becomes bad.

· PRE SW sensitivity (Ta = 25°C)

PRE SW

4

3.6 V

“H”

3

PRE AMP: OFF

3.0 V

2

1.8 V

1.5 V

1

0.5 V

1.2 V

0 1.5

2.0

2.5

3.0

3.5

4.0

Supply voltage VCC (V)

6

2002-04-19

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