Datasheet TK15325MTL Datasheet (TOKO)

TK15325

+

-

+

-

+

-

+

-

Ach

Bch

1ch-in

Ach

Bch

2ch-in

V

CC

1 ch out

1KEY

2 ch out

2KEY

GND

Audio Analog Switch

FEATURES

■ Wide Operating Voltage Range (±3 to ±7 V)

■ Low Distortion (typ. 0.003%)

■ Wide Dynamic Range (typ. 6 V

P-P

)

■ Low Output Impedance (typ. 20 Ω)

■ Low Switching Noise (typ. 3 mV)

DESCRIPTION

The TK15325M is an Analog Switch IC that was developed
for audio frequency. Function is to select one output from
two inputs in a device that includes two circuits, and the
channel can be changed by low level. The TK15325M has
a dual power supply and the input bias is direct coupling at
GND level. Because the distortion is very low, the
TK15325M fits various signals switching. It is best suited
for Hi-Fi devices. Operating voltage is wide, the circuit
plan is simple. The TK15325M is available in a small
plastic surface mount package (SSOP-12).

APPLICATIONS

■ Audio Systems

■ Radio Cassettes

1ch-in 2ch-in

TK15325

V

CC

Bch

OUT

Ach

1KEY

NC

GND

11

Bch

10

OUT

9

Ach

8

2 KEY
NC

7

BLOCK DIAGRAM

ORDERING INFORMATION

TK15325M

June 1999 TOKO, Inc. Page 1

Tape/Reel Code

TAPE/REEL CODE

TL: Tape Left

TK15325

ABSOLUTE MAXIMUM RATINGS

Supply Voltage ...................................................... ±7.5 V

Power Dissipation (Note 5) ................................ 350 mW

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

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

CONTROL SECTION

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

TK15325M ELECTRICAL CHARACTERISTICS

Test conditions: V

LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU

= ±4 V, T

CC

= 25 °C, unless otherwise specified.

A

ANALOG SWITCH SECTION

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

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

Operating Voltage Range............................... ±3 to ±7 V

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

I

CC

tnerruCylppuS 2.32.5Am

NOITCESLORTNOCYEK

V

LI

V

HI

I

YEKO

I

YEKI

tnerruCtuptuODNGoT03Aµ

tnerruCwolfnIVmorF

leveLwoLegatloVtupnI1etoN3.0-8.0+V

leveLhgiHegatloVtupnI8.1V

CC

CC

03Aµ

NOITCESHCTIWSGOLANA

DHTnoitrotsiDcinomraHlatoTV

N

L

esioNlaudiseR2etoN01smrVµ

OSInoitalosI

PESnoitarapeS

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V

NI

3etoN

V

NI

3etoN

zHk1=f,smrV1=300.0600.0%

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AVGniaGegatloVzHk02~=f0Bd

V

tnec

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lanimreTtuptuO-tupnI

2.0-02.0+V

3.0+V

∆V

tnec

I

NI

Z

TUO

Note 1: The KEY input equivalent circuit is shown in Figure A.
1 channel and 2 channel is the separate action by 1Key pin and 2 key pin. When the control pin is

open, it is outputted high level (about 1.4 V). Then the A channel input signal is outputted. The
change is carried out at low level.

Note 2: The specification means a value as measurement-input terminal connects to ground

through a capacitor.

Note 3: ISO is a cross talk between A channel and B channel, SEP is a cross talk between 1 channel and 2

channel. The specification means a value as measurement-input termianl connects to ground
through 10 kΩ resistor and capacitor.

Note 4: Input equivalent circuit is shown in Figure B. The standard application of TK15325M is the direct

connecting. When connecting a capacitor, supplying a bias voltage from outside is unnecessary.

Note 5: Power dissipation is 350 mW when mounted as recommended. Derate at 3.0 mW/°C for operation

above 25°C.

ecnereffiD

egatloVlanimreTtuptuO

lennahcemasneewteB331Vm

tnerruCsaiBtupnI4etoN5.0Aµ

ecnadepmItuptuOecnadepmICD02

V

CC

Input Key

Input

Logic

Figure A

V

Figure B

Ω

EE

Page 2 June 1999 TOKO, Inc.

TEST CIRCUITS AND METHODS

V

CC

~

Cont.

+

V

EE

+

+

V

SW6

SW7

CC

SW3

50 kΩ

TK15325

1 kHz

1 Vrms

or

2 Vrms

SW9

~

10 kHz
1 Vrms

~

SW8

SW5

10 kΩ

SW4

SW2

V

~

SUPPLY CURRENT (FIGURE 1)

This current is a consumption current with a nonloading
condition.

1) Bias supply to Pins 2,4,9,11. (This condition is the same
with other measurements, omitted from the next for
simplicity)

2) Measure the inflow current to Pin 1 from VCC. This current is
the supply current.

CC

AV

50 kΩ

33 µF

+

SW1

V

THD

_

+
33 µF

CONTROL LOW/HIGH LEVEL (FIGURE 2)

This level is to measure the threshold level.

1) Input, the VCC to Pin 1 and input V

to Pin 12. (This

EE

condition is the same with other measurements, omitted
from the next for simplicity)

2) Input to Pin 4 with sine wave (f = 1 kHz, VIN = 1 Vrms).

3) Connect an oscilloscope to Pin 3.

4) Drop the control voltage gradually from 0 V until the
sine wave appears at the oscilloscope. This voltage is
the threshold level when the wave appears.

50 K

50 K

Figure 1

50 K

50 K

V

EE

Figure 2

June 1999 TOKO, Inc. Page 3

TK15325

V

CC

Cont.

+

+

V

EE

+

TEST CIRCUITS AND METHODS (CONT.)

CONTROL OUTFLOW/INFLOW CURRENT (FIGURE 3)

This current means maximum current with the control.

1) Measure the current from Pin 5 to GND.
This current is the outflow current.

2) Next, measure the current from VCC to Pin 5.
This current is the inflow current.

V

CC

+

Figure 4

+

V

EE

Figure 3

VOLTAGE GAIN (FIGURE 5)

This is the output level against input level.

1) Pin 5 is in the open condition, or high level.

2) Connect AC volt meters to Pin 4 and Pin 3.
(Using the same type meter is best)

TOTAL HARMONIC DISTORTION (FIGURE 4)

Use the lower distortion oscillator for this measurement
because distortion of the TK15325 is very low.

1) Pin 5 is in the open condition, or high level.

2) Connect a distortion analyzer to Pin 3.

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

4) Measure the distortion of Pin 3. This value is the
distortion of 1-Ach.

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

6) Input the same sine wave to Pin 2.

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

3) Input a sine wave (f = max. 20 kHz, 1 Vrms) to Pin 4.

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

5) Measure the level of Pin 3 and name this V2.

6) Calculate Gain = 20 Log (( |V2 - V1| )/V1)
V1<V2 + Gain, V1>V2 - Gain
This value is the voltage gain of 1-Ach.

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

8) Input the same sine wave to Pin 2.

9) Measure and calculate in the same way.
This value is the maximum input level of 1-Bch.

of 1-Bch.

Page 4 June 1999 TOKO, Inc.

TK15325

V

CC

Cont.

+

+

V

EE

+

TEST CIRCUITS AND METHODS (CONT.)

V

CC

+

+

Cont.

Figure 5

MAXIMUM INPUT LEVEL (FIGURE 6)

This measurement measures at output side.

1) Pin 5 is in the open condition, or high level.

2) Connect a distortion analyzer and an AC volt meter to
Pin 3.

3) Input a sine wave (1 kHz) to Pin 4 and elevate the
voltage gradually until the distortion gets to

0.1%.

4) When the distortion amounts to 0.1%, stop elevating and
measure the AC level of Pin 3.
This value is the maximum input level of 1-Ach.

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

6) Input the same sine wave to Pin 2.

7) Measure in the same way.
This value is the maximum input level of 1-Bch.

+

V

EE

Figure 6

RESIDUAL NOISE (FIGURE 7)

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

1) Pin 5 is the open condition, or high level.

2) Connect an AC volt meter to Pin 3.

3) Connect a capacitor from Pin 4 to GND.

4) Measure AC voltage of Pin 3. This value is the noise of
1-Ach. If the influence of noise from outside exists, use
optional filters.

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

6) Connect to GND through a capacitor from Pin 2.

7) Measure in the same way.
This value is the noise level of 1-Bch.

June 1999 TOKO, Inc. Page 5

TK15325

V

CC

Cont.

+

V

EE

+

+

+

10 K

V

CC

+

TEST CIRCUITS AND METHODS (CONT.)

+

Cont.

Figure 7 Figure 8

ISOLATION (FIGURE 8)

This is the cross talk between Ach and Bch.

1) Pin 5 is in the open condition, or high level.

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

3) Connect a capacitor and a resistance to GND
from Pin 4.

4) Input a sine wave (10 kHz, 1 Vrms) to Pin 2.

5) Measure the level of Pin 2 and name this V3.

6) Measure the level of Pin 3 and name this V4.

7) Calculate:
ISO = 20 Log (V4 / V3)

This value is the isolation to Ach from Bch.

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

9) Change line of Pin 2 and Pin 4.

10) Input the same sine wave to Pin 4.

11) Measure and calculate in the same way.

This value is the isolation to Bch from Ach.

+

V

EE

SEPARATION (FIGURE 9)

This is the cross talk between 1ch and 2ch.

1) Control level is free for Pin 5 and Pin 8.

2) Connect AC volt meters to Pin 4 (or Pin 2) and Pin 10.

3) Connect Pin 9 and Pin 11 to GND through capacitors
and a resistance.

4) Input a sine wave (10 kHz, 1 Vrms) to Pin 2 and Pin 4.

5) Measure the level of Pin 4 and name this V5.

6) Measure the level of Pin 10 and name this V6.

7) Calculate:
SEP = 20 Log (V6 / V5)

This value is the separation to 2ch from 1ch.

Page 6 June 1999 TOKO, Inc.

TEST CIRCUITS AND METHODS (CONT.)

TK15325

V

CC

++

+

Cont.

+

+

10 K

+

V

EE

V

CC

+

Cont.

+

V

EE

Figure 10Figure 9

I/O TERMINAL VOLTAGE (FIGURE 10)

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

1) Pin 5 is in the open condition, or high level.

2) Connect a DC volt meter to Pin 3 and measure.
This value is the terminal voltage of 1-Ach.

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

4) Measure in the same way.
This value is the terminal voltage of 1-Bch.

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 = | (1 - Ach value) - (1 - Bch value) |

This value is the voltage difference of 1ch.

June 1999 TOKO, Inc. Page 7

TK15325

LEVEL

(dB)

THD

(%)

THD

(%)

LEVEL

(V

)

LEVEL

(dB)

TYPICAL PERFORMANCE CHARACTERISTICS

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

SUPPLY CURRENT

5

4

3

(mA)

CC

I

2

1

0

0 ±1 ±2 ±3 ±4 ±5 ±6 ±7 ±8

5

4

rms

3

SUPPLY VOLTAGE

V

(V)

CC

DYNAMIC RANGE

vs. SUPPLY VOLTAGE

VS.

TOTAL HARMONIC DISTORTION

0.1

0.01

0.001

0.1 1 10 100

2

vs. FREQUENCY

f (kHz)

DYNAMIC RANGE

vs. LOAD RESISTANCE

TOTAL HARMONIC DISTORTION

0.1

0.01

0.001

-60

-70

-80

vs. LOAD RESISTANCE

0.1 1 10 100
RL (kΩ)

ISOLATION

vs. FREQUENCY

2

1

0

0 ±1 ±2 ±3 ±4 ±5 ±6 ±7 ±8

VCC (V)

SEPARATION

-60

-70

-80

-90

-100

-110

0.1 1 10 100

vs. FREQUENCY

f (kHz)

1

LEVEL (Vrms)

0

0.1 1 10 100
RL (kΩ)

CONTROL THRESHOLD

TEMPERATURE

1.5

1

LEVEL (V)

0.5

0

-20 0 20 40 60 80
TA (°C)

VS.

-90

-100

-110

0.1 1 10 100
f (kHz)

VOLTAGE GAIN VS.

TEMPERATURE

+.1

0

GVA (dB)

-.1

-20 0 20 40 60 80
TA (°C)

Page 8 June 1999 TOKO, Inc.

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

V

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

CC

TK15325

RESIDUAL NOISE VS.

TEMPERATURE

6

4

LEVEL (µVrms)

2

0

-20 0 20 40 60 80
TA (°C)

3

2

LEVEL (mV)

1

0

-20 0 20 40 60 80

TERMINAL VOLTAGE AND CIRCUIT

Condition: VCC = +4 V, VEE = -4 V.

.ONNIPTNEMNGISSAEGATLOVCDNOITCNUF/TIUCRIC

1V

2
4
9

11

CC

BNI,ANI

nepO:tupnI

V0:tupnI

OUTPUT DIFFERENCE VS.

TEMPERATURE

TA (°C)

V4+niPegatloVylppuS+

gnitaolF

V0

INPUT BIAS CURRENT VS.

1.2

1.0

.8

.6

.4

CURRENT (µA)

.2

0

-20 0 20 40 60 80

TEMPERATURE

TA (°C)

niPtupnIlangiS

3

01

TUO

100

nepO:tupnI

V0:tupnI

V3.3-

V0

niPtuptuOlangiS

5

YEKV4.1

8

niPlortnoC
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June 1999 TOKO, Inc. Page 9

TK15325

1OUT

2AIN V

CC

GND

2OUT

1KEY 2KEY

2BIN

1AIN

1BIN

+

R

L

10 µF

1Bin

11
10

9
8

7

2 Bin

1Key

2Key

+

R

L

10 µF

+

33 µF

1Ain 2Ain

V

CC

V

EE

+

33 µF

APPLICATION INFORMATION

KEY INPUT CIRCUIT

1ch and 2ch is separate action by each control keys. Figure
11 is an equivalence circuit of key input. When terminal of
key is the open, is outputting high level (about 1.4 V), and
then Ach input signal is outputted. The channel at TK15325M
can be changed by low level. When a control terminal is
operated to low function , sometimes may flows out
maximum values about 30 µA as current from the terminal.
For this reason, use a resistance which does not exceed

0.8 V value when attaching a resistance to the outside and
make low condition.

Key in

i

to Logic

Figure 11

SWITCHING TIME

This time is the signal change response time compared to
the control key input signal. Figure 12 illustrates the timimg
chart. T = 2 µs typically.

Bch (Ach)

Key in

50%

Ach (Bch)

SW out

t

Figure 12

APPLICATION

Figure 13

CROSS TALK (ISOLATION AND SEPARATION)

Figure 14 is an example of a layout pattern. As the
TK15325M is a direct coupling type, the influence by
applications is not almost. But, if it is coupled at the
capacitor, by high impedance at input, capacitors
acccomplishes the antenna action each other. Then in
case its parts are bigger, and the space between capacitors
is too narrow, cross talk will increase. Therefore, when
designing the print circuit pattern, separate the input
capacitors as far as possible and use smaller parts. (e.g.,
surface mount type)

Figure 13 illustrates an example of a typical application.
The standard application is to use direct coupling at the
inputs and outputs of the TK15325M. For characteristics of
distortion and dynamic range versus RL, refer to the graphs
in the Typical Performance Characteristics. The TK15325M
can be used at the capacitor coupling too, but then the bias
supply is necessary from outside.

Page 10 June 1999 TOKO, Inc.

Figure 14

TK15325

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 changes to the reverse. 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 outputted by the speakers, then it appears as a Shock Sound. Output terminal
voltage difference of the TK15325M is a value that adds the internal bias difference and the off-set voltage difference. The
value of the TK15325M is very small; its maximum value is 3 mV. So almost the output bias difference will be decided by
the supply bias difference. Toko can offer the “Muting IC” if users wish to mute Switching Noise.

DIRECT TOUCH

The signal input terminals:
Internal circuits are operated by constant current circuit, even if VCC or GND is contacted, damage does not occur.
The signal output terminal:
Outflow or inflow current is decided by ability of final transistor, but protection circuit is not attached. If GND or VCC are
contacted damage may occur. Pay attention to long time contact. Do not supply over the maximum rating.
Referenced to GND, do not provide to all terminals over VCC +0.3 V or -0.3 V.

DC SIGNAL INPUT

The output of the TK15325M has a saturation voltage (both VCC and VEE sides about 1.0 V); accordingly the use of a DC
signal is not recommend (e.g., the pulse signal etc.)

NC TERMINAL

NC terminals are not wired inside IC by bonding wire. NC terminals are not tested so do not connect at outside.

June 1999 TOKO, Inc. Page 11

TK15325

PACKAGE OUTLINE

SSOP-12

12

Lot. No.

AAA

YYY

+0.15

-0.05

0.3

Marking Information

0.4

1.2

7

61

5.0

Marking

5.4
e1

4.4

1.7 max

1.4

0 ~ 0.2

e

0.8

M0.10

0.1

e

0.8

Recommended Mount Pad

0 ~ 10

0.5

+

0.3

6.0

+0.15

-0.15

0.15

TK15325M 325

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

Toko America, Inc. Headquarters
1250 Feehanville Drive, Mount Prospect, Illinois 60056
Tel: [phone] Fax: [phone]

TOKO AMERICA REGIONAL OFFICES

Midwest Regional Office
Toko America, Inc.
1250 Feehanville Drive
Mount Prospect, IL 60056
Tel: [phone]
Fax: [phone]

Western Regional Office
Toko America, Inc.
2480 North First Street , Suite 260
San Jose, CA 95131
Tel: [phone]
Fax: [phone]

Eastern Regional Office
Toko America, Inc.
107 Mill Plain Road
Danbury, CT 06811
Tel: [phone]
Fax: [phone]

Semiconductor Technical Support
Toko Design Center
4755 Forge Road
Colorado Springs, CO 80907
Tel: [phone]
Fax: [phone]

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 June 1999 TOKO, Inc.

All Rights Reserved

IC-119-TK119xx

0798O0.0K

Printed in the USA© 1999 Toko, Inc.