January 2000 TOKO, Inc.
Page 1
TK15210
FEATURES
s
Wide Operating Voltage Range (3 to 13 V)
s
Low Distortion (typ. 0.004%)
s
Wide Dynamic Range (typ. 6 V
P-P
)
s
Low Output Impedance (typ. 20
Ω
)
s
Protection at Output Terminal.
BLOCK DIAGRAM
TK15210
APPLICATIONS
s
Audio Systems
s
Radio Cassettes
Audio Analog Switch
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 (V
CC
/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.
The TK15210M is available in the small SOT23L-6 plastic
surface mount package.
ORDERING INFORMATION
TAPE/REEL CODE
TL: Tape Left
Tape/Reel Code
TK15210M
20P
OUT
IN A
KEY
VCC
IN B
GND
+
-
+
-
IN A
IN B
VCC
OUT
KEY
GND
VCC
VCC
VCC
VCC
Page 2
January 2000 TOKO, Inc.
TK15210
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Ω
ABSOLUTE MAXIMUM RATINGS
TK15210M ELECTRICAL CHARACTERISTICS
Test conditions: V
CC
= 8.0 V, T
A
= 25
°
C,
unless otherwise specified.
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 k
Ω
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.
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
CC
+0.3 V
ANALOG SWITCH SECTION
Signal Input Voltage ......................... -0.3 V to V
CC
+0.3 V
Signal Output Current ............................................. 3 mA
Maximum Input Frequency .................................. 100 kHz
Lead Soldering Temperature (10 s) ...................... 235
°
C
Logic
Key Input
January 2000 TOKO, Inc.
Page 3
TK15210
TEST CIRCUITS AND METHODS
V
~
V
_
THD
+
SW1
+
10 µF
SW6
SW2
+
10 µF
SW7
~
SW3
SW5
SW4
~
5 k
Ω
SW9
1 kHz
1 Vrms
or
2 Vrms
10 kHz
1 Vrms
SW8
VCC
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 V
CC
. This
current is the supply current.
CONTROL LOW/HIGH LEVEL (FIGURE 2)
This level is a measurement of the threshold level.
1) Input V
CC
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).
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.
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
the outflow current.
A
VCC
Figure 1
VCC
+
V
+
~
OSC
Figure 2
VCC
+
A
Figure 3
Page 4
January 2000 TOKO, Inc.
TK15210
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.
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
10
(( |V2 - V1| )/V1)
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.
TEST CIRCUITS AND METHODS (CONT.)
VCC
+
+
~
THD
Figure 4
VCC
+
+
~
V
~
V
~
V1
V2
Figure 5
MAXIMUM INPUT LEVEL (FIGURE 6)
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.
VCC
+
+
~
V
~
THD
Figure 6
January 2000 TOKO, Inc.
Page 5
TK15210
TEST CIRCUITS AND METHODS (CONT.)
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.
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
10
(V4 / V3)
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.
VCC
+
+
V
~
Figure 7
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.
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.
VCC
+
+
V
~
5K
V
~
V4
V3
~
+
Figure 8
VCC
+
V
Figure 9
Page 6
January 2000 TOKO, Inc.
TK15210
TYPICAL PERFORMANCE CHARACTERISTICS
V
CC
= 8 V, T
A
= 25
°
C, unless otherwise specified.
I CC
(mA)
1
4
SUPPLY CURRENT
VS.
SUPPLY VOLTAGE
VCC (V)
0
0 2 4 6 8 10 12 14
3
2
5
LEVEL (Vrms)
1
4
MAXIMUM INPUT LEVEL
VS.
SUPPLY VOLTAGE
VCC (V)
0
0 2 4 6 8 10 12 14
3
2
5
f = 1 kHz
THD = 0.1 %
THD
(%)
0.1
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
f (kHz)
0.001
0.1 1 10 100
0.01
-20
°
C
+25
°
C
+75
°
C
THD
(%)
0.1
TOTAL HARMONIC DISTORTION
vs. LOAD RESISTANCE
RL (k
Ω
)
0.001
0.1 1 10 100
0.01
CT (dB)
-50
CROSS TALK
VS.
FREQUENCY
f (kHz)
-100
0.1 1 10 100
-60
-80
-90
-70
LEVEL (V)
2
KEY THRESHOLD
VS.
TEMPERATURE
TA (
°
C)
0
-40 -20 0 20 40 60 80
1.5
1
0.5
January 2000 TOKO, Inc.
Page 7
TK15210
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
V
CC
= 8 V, T
A
= 25
°
C, unless otherwise specified.
LEVEL (dB)
VOLTAGE GAIN
VS.
TEMPERATURE
TA (
°
C)
-40 -20 0 20 40 60 80
+0.1
0
-0.1
LEVEL (µVrms)
RESIDUAL NOISE
VS.
TEMPERATURE
TA (
°
C)
-40 -20 0 20 40 60 80
6
4
2
0
8
Page 8
January 2000 TOKO, Inc.
TK15210
TERMINAL VOLTAGE AND CIRCUIT
Condition: V
CC
= 8 V.
.
O
N
N
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P
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N
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N
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F
/
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R
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C
1
3
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4
.
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5
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V
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6
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C
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p
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S
January 2000 TOKO, Inc.
Page 9
TK15210
APPLICATION INFORMATION
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
µ
A 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.
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
µ
s typically.
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 vers