TK15220 데이터 시트보기 (PDF) - Toko America Inc

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TK15220

Audio Analog Switch

Toko America Inc  

TK15220

TEST CIRCUITS AND METHODS

SW6

SW7

SW9

SW8

1 kHz

1 Vrms

or

~

2 Vrms

10 kHz

1 Vrms ~

5 kΩ

SW5

10 µF

SW3

10 µF

SW4

SW2

V~

V_

THD

VCC

+

SW1

1: The above condition tests the dynamic range measurement for channel A.

2: SW5 is for residual noise measurement.

3: SW8 is for cross talk measurement.

SUPPLY CURRENT (FIGURE 1)

This current is a consumption current with a nonloading

condition.

1) Measure the inflow current to Pin 6 from VCC. This

current is the supply current.

VCC

A

+

~

OSC

VCC

+

V

Figure 2

KEY INPUT IMPEDANCE (FIGURE 3)

Figure 1

CONTROL LOW/HIGH LEVEL (FIGURE 2)

This impedance means the base resistance of the input

transistor (see terminal circuit on page 8).

1) Remove VCC of Pin 6.

2) Measure the resistance value by measuring instrument.

(e.g., multimeter etc.)

This level is to measure the threshold level.

1) Input the VCC to Pin 6. (This condition is the same with

the other measurements, omitted from the next for

simplicity.)

2) Input to Pin 1 with a sine wave (1 kHz, 1 Vrms).

3) Connect an oscilloscope to Pin 2.

4) Elevate the Pin 4 voltage from 0 V gradually, until the

sine wave appears at the oscilloscope. This voltage is

the threshold level when the wave appears.

Figure 3

June 1999 TOKO, Inc.

Page 3

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