Datasheet TK15210MTL Datasheet (TOKO)

TK15210

Audio Analog Switch

FEATURES

■ Wide Operating Voltage Range (3 to 13 V)

■ Low Distortion (typ. 0.004%)

■ Wide Dynamic Range (typ. 6 V

■ Low Output Impedance (typ. 20

P-P

)

Ω)

■ Protection at Output Terminal.

DESCRIPTION

The TK15210M is an Analog Switch IC that was developed
for audio frequency applications. The function of the IC is
to select one output from two input channels. The channel
selection is controlled by a low level. The TK15210M
operates from a single power supply with the input bias
built-in (VCC/2). Because the distortion is very low, the
TK15210M is suitable for various signal switching
applications, especially Hi-Fi devices. The TK15210M
offers a wide operating voltage range with simple associated
circuitry.

APPLICATIONS

■ Audio Systems

■ Radio Cassettes

P

0

2

TK15210

IN A

OUT

IN B

V

CC

GND

KEY

The TK15210M is available in the small SOT23L-6 plastic
surface mount package.

ORDERING INFORMATION

TK15210M

Tape/Reel Code

TAPE/REEL CODE

TL: Tape Left

IN A

IN B

V

CC

V

CC

BLOCK DIAGRAM

+

-

+

-

V

CC

V

CC

V

CC

OUT

KEY

GND

January 2000 TOKO, Inc. Page 1

TK15210

Logic

Key Input

ABSOLUTE MAXIMUM RATINGS

Supply Voltage ......................................................... 14 V

Operating Voltage Range................................. 3 to 13 V

Power Dissipation (Note 4) ................................ 200 mW

Storage Temperature Range ................... -55 to +150 °C

Operating Temperature Range ...................-20 to +75 °C

CONTROL SECTION

Input Voltage .................................... -0.3 V to V

+0.3 V

CC

TK15210M ELECTRICAL CHARACTERISTICS

Test conditions: V

LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU

= 8.0 V, T

CC

= 25 °C, unless otherwise specified.

A

ANALOG SWITCH SECTION

Signal Input Voltage ......................... -0.3 V to VCC +0.3 V

Signal Output Current ............................................. 3 mA

Maximum Input Frequency..................................100 kHz

Lead Soldering Temperature (10 s) ...................... 235 °C

I

CC

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CC

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Note 1: The KEY input equivalent circuit is shown to the right. When the

control pin is open, the input is pulled up to a high level
(approximately 1.4 V). This applies the channel A input signal
to the output. A low level changes the output to the channel B
input signal.

Note 2: This value measured with a capacitor connected between the

input terminal and ground. See Figure 7.

Note 3: This value measured with a 5 kΩ resistor and series capacitor

connected between the input terminal and ground. See Figure

8.

Note 4: Power dissipation is 200 mW when mounted as recommended.

Derate at 1.6 mW/°C for operation above 25 °C.

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CC

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81Vm

Ω

Page 2 January 2000 TOKO, Inc.

TEST CIRCUITS AND METHODS

TK15210

V

CC

SW6

SW3

SW7

SW4

SW9

1 kHz

1 Vrms
2 Vrms

SW8

10 kHz
1 Vrms

~

or

~

5 kΩ

SW5

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.

V

CC

A

10 µF

10 µF

V

~

+

+

SW2

V

THD

_

+

OSC

~

+

SW1

V

CC

+

V

Figure 2

KEY INPUT CURRENT (FIGURE 3)

This current is the outflow current from the control terminal.

1) Measure the current to GND from Pin 4. This current is

Figure 1

CONTROL LOW/HIGH LEVEL (FIGURE 2)

the outflow current.

V

CC

+

This level is a measurement of the threshold level.

1) Input VCC to Pin 6. (This condition is the same with
all remaining measurements, omitted from their
descriptions for simplicity.)

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

A

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

Figure 3

the threshold level when the wave appears.

January 2000 TOKO, Inc. Page 3

TK15210

V

CC

+

+

~

V
~V~

V1 V2

TEST CIRCUITS AND METHODS (CONT.)

TOTAL HARMONIC DISTORTION (FIGURE 4)

Use the lower distortion oscillator for this measurement
because the distortion of the TK15210 is very low.

1) Pin 4 is in the open condition, or high level.

2) Connect a distortion analyzer to Pin 2.

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

4) Measure the distortion of Pin 2. This value is the
distortion of Ach.

5) Next connect Pin 4 to GND, or low level.

6) Input the same sine wave to Pin 3.

7) Measure in the same way. This value is the distortion
of Bch.

V

CC

+

Figure 5

MAXIMUM INPUT LEVEL (FIGURE 6)

+

THD

~

Figure 4

VOLTAGE GAIN (FIGURE 5)

This is the output level vs. the input level.

1) Pin 4 is in the open condition, or high level.

2) Connect AC volt meters to Pin 1 and Pin 3.
(For best results, use identical meters.)

3) Input a sine wave (1 kHz) to Pin 1 (f = optional up to max.
20 kHz, 1 Vrms).

4) Measure the level of Pin 1 and name this V1.

5) Measure the level of Pin 2 and name this V2.

6) Calculate Gain = 20 Log

(( |V2 - V1| )/V1)

10

V1<V2 = + Gain, V1>V2 = - Gain
This value is the voltage gain of Ach.

7) Next, connect Pin 4 to GND, or low level.

8) Input the same sine wave to Pin 3.

9) Measure and calculate in the same way.
This value is the voltage gain of Bch.

This measurement is made at the output side.

1) Pin 4 is in the open condition, or high level.

2) Connect a distortion analyzer and an AC volt meter to
Pin 2.

3) Input a sine wave (1 kHz) to Pin 1 and elevate the voltage
from 0 V gradually until the distortion gets to 0.1% at Pin

2.

4) When the distortion amounts to 0.1%, stop elevating and
measure the AC level of Pin 2.
This value is the maximum input level of Ach.

5) Next, connect Pin 4 to GND, or low level.

6) Input the same sine wave to Pin 3.

7) Measure in the same way.
This value is the maximum input level of Bch.

V

CC

+

+

THD

~

V
~

Figure 6

Page 4 January 2000 TOKO, Inc.

TEST CIRCUITS AND METHODS (CONT.)

TK15210

RESIDUAL NOISE (FIGURE 7)

This value is not a S/N ratio. This is a noise which occurs
from the device itself.

1) Pin 4 is in the open condition, or high level.

2) Connect an AC volt meter to Pin 2.

3) Connect a capacitor to GND from Pin 1.

4) Measure the AC voltage of Pin 2. This value is the noise
of Ach. If external noise exists, use optional filters to
eliminate it.

5) Next, connect Pin 4 to GND, or low level.

6) Remove the capacitor of Pin 1 and connect the capacitor
to Pin 3.

7) Measure in the same way.
This value is the noise level of Bch.

V

CC

+

+

V
~

V

CC

+

5K

V
~

V4 V3

+

V
~

~

+

Figure 8

I/O TERMINAL VOLTAGE (FIGURE 9)

This is the DC voltage of the input and output.
Because the input and the output are nearly equal, only the
output is measured.

1) Pin 4 is in the open condition, or high level.

2) Connect a DC volt meter to Pin 2 and measure.
This value is the terminal voltage of Ach.

3) Next, connect Pin 4 to GND, or low level.

4) Measure in the same way.
This value is the terminal voltage of Bch.

Figure 7

CROSS TALK (FIGURE 8)

This is the cross talk between Ach and Bch.

1) Pin 4 is in the open condition, or high level.

2) Connect AC volt meters to Pin 2 and Pin 3.

3) Connect a capactior and a resistance in series to GND
from Pin 1.

4) Input sine wave (10 kHz, 1 Vrms) to Pin 3.

5) Measure the level of Pin 3 and name this V3.

6) Measure the level of Pin 2 and name this V4.

7) Calculate:
Cross Talk = 20 Log

(V4 / V3)

10

This value is the cross talk to Ach from Bch.

8) Next, connect Pin 4 to GND, or low level.

9) Change line of Pin 1 and Pin 3.

10) Input the same sine wave to Pin 1.

11) Measure and calculate in the same way.

This value is the isolation to Bch from Ach.

V

CC

+

V

Figure 9

OUTPUT TERMINAL DIFFERENCE

This is the DC output voltage difference between Ach and
Bch. This is calculated by using values measured at the
I/O Terminal Voltage.

∆ Vcent = | (Ach DC output value) - (Bch DC output
value) |

This value is the voltage difference.

January 2000 TOKO, Inc. Page 5

TK15210

THD

(%)

THD

(%)

TYPICAL PERFORMANCE CHARACTERISTICS

VCC = 8 V, TA = 25 °C, unless otherwise specified.

SUPPLY CURRENT

SUPPLY VOLTAGE

5

4

3

(mA)

CC

2

I

1

0

0 2 4 6 8 10 12 14

V

(V)

CC

TOTAL HARMONIC DISTORTION

0.1

0.01

vs. FREQUENCY

VS.

-20 °C
+25 °C

+75 °C

MAXIMUM INPUT LEVEL

SUPPLY VOLTAGE

5

f = 1 kHz
THD = 0.1 %

4

3

2

LEVEL (Vrms)

1

0

0 2 4 6 8 10 12 14

V

(V)

CC

TOTAL HARMONIC DISTORTION

vs. LOAD RESISTANCE

0.1

0.01

VS.

0.001

0.1 1 10 100
f (kHz)

CROSS TALK

-50

-60

-70

CT (dB)

-80

-90

-100

0.1 1 10 100

FREQUENCY

f (kHz)

VS.

0.001

0.1 1 10 100
RL (kΩ)

KEY THRESHOLD

2

1.5

1

LEVEL (V)

0.5

0

-40 -20 0 20 40 60 80

TEMPERATURE

TA (°C)

VS.

Page 6 January 2000 TOKO, Inc.

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

V

= 8 V, TA = 25 °C, unless otherwise specified.

CC

TK15210

VOLTAGE GAIN

TEMPERATURE

+0.1

0

LEVEL (dB)

-0.1

-40 -20 0 20 40 60 80
TA (°C)

VS.

RESIDUAL NOISE

TEMPERATURE

8

6

4

LEVEL (µVrms)

2

0

-40 -20 0 20 40 60 80
TA (°C)

VS.

January 2000 TOKO, Inc. Page 7

TK15210

TERMINAL VOLTAGE AND CIRCUIT

Condition: VCC = 8 V.

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Page 8 January 2000 TOKO, Inc.

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APPLICATION INFORMATION

TK15210

KEY INPUT CIRCUIT

Figure 10 illustrates the KEY input equivalent circuit. When
the control pin is open, the input is pulled up to a high level
(approximately 1.4 V). This applies the channel A input
signal to the output. A low level changes the output to the
channel B input signal. When the control terminal is pulled
low, a current up to 30 µA may flow out of the terminal. For
this reason, an external resistor value must be selected
which results in a voltage of less than 0.8 V to maintain a low
condition.

Key in

to Logic

Figure 10

SWITCHING TIME

This time is the signal change response time compared to
the control key input signal. Figure 11 illustrates the timing
chart. T = 2 µs typically.

10 µF

R

L

10 µF

+

10 µF

inA

+

out

+

inB

Key

V

CC

+

33 µF

Figure 12

CROSS TALK

Figure 13 is an example of a layout pattern. In the
application of the TK15210M, the following must be
considered. Because of the high impedance at the inputs,
the capacitors can act as antennas to each other. If the
parts are bigger, and the space between the capacitors is
too narrow, then cross talk will increase. Therefore, when
designing the printed circuit pattern, separate the input
capacitors as far as possible and use as small a part as
possible (e.g., surface mount types, etc.).

Bch (Ach)

Key in

50%

Ach (Bch)

SW out

t

Figure 11

APPLICATION

Figure 12 illustrates an example of a typical application.
The standard application is to use capacitor coupling at the
inputs and output of the TK15210M. For characteristics of
distortion and dynamic range versus R
in the Typical Performance Characteristics. The TK15210M

, refer to the graphs

L

Figure 13

can also be used with direct coupling, but the characteristics
will get worse (distortion, etc.). If direct coupling is desired,
then it is recommended to use external circuitry that is
biased compatible with the TK15210M.

January 2000 TOKO, Inc. Page 9

TK15210

APPLICATION INFORMATION (CONT.)

OUTPUT TERMINAL VOLTAGE DIFFERENCE

This parameter is the output voltage difference between Ach and Bch, and appears when the channel changes from Ach
to Bch, or vice versa. Generally, this is called Switching Noise or Pop Noise. If this value is big and if this noise is amplified
by the final amplifier and is applied to the speakers, then it appears as a Shock Sound. The output terminal voltage
difference of the TK15210M is a value that adds the internal bias difference and the offset voltage difference. The value
of the TK15210 is very small; its maximum value is 18 mV. Toko can offer the “Muting IC” if users wish to mute Switching
Noise.

DIRECT CONTACT

The signal input terminals:
Internal circuits are operated by constant current circuits; even if VCC or GND is contacted, damage does not occur.
The signal output terminal:
As for inflow, internal circuits are operated by constant current circuits; even if VCC is contacted, damage does not occur.
Outflow is protected by the circuit. Even if the terminal is contacted to GND, damage does not happen. Package damage
may occur due to heat. Pay attention to long time contact.
Do not supply over the maximum rating.
Referenced to GND, do not provide terminal voltages over VCC +0.3 V or -0.3 V.

DC SIGNAL OUTPUT

The output of the TK15210M has a saturation voltage (both VCC and GND sides of approximately 1.0 V); accordingly the
use of a DC signal is not recommended (e.g., pulse signal, etc.).

Page 10 January 2000 TOKO, Inc.

NOTES

TK15210

January 2000 TOKO, Inc. Page 11

TK15210

PACKAGE OUTLINE

SOT23L-6

6

123

Dimensions are shown in millimeters
Tolerance: x.x = ± 0.2 mm (unless otherwise specified)

0.4

e e

0.95 0.95

3.5

(3.4)

Marking Information

TK15210M S1

+0.15

- 0.05

+0.3

- 0.1

0.1

M

Marking

+0.15

- 0.05

0.32

0.1

0.1

M

0.3

1.2

1.4 max

+0.15

- 0.05

0 - 0.1

0.15

0.6

1.0

Recommended Mount Pad

3.3

ee

0.95 0.95

2.2

+ 0.3

3.0
e1

15 max

0.4

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Visit our Internet site at http://www.tokoam.com

The information furnished by TOKO, Inc. is believed to be accurate and reliable. However, TOKO reserves the right to make changes or improvements in the design, specification or manufacture of its
products without further notice. TOKO does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of
third parties which may result from the use of its products. No license is granted by implication or otherwise under any patent or patent rights of TOKO, Inc.

Page 12 January 2000 TOKO, Inc.

All Rights Reserved

IC-119-TK119xx

0798O0.0K

Printed in the USA© 1999 Toko, Inc.