TK15326
Audio Analog Switch
FEATURES
s
s
s
s
s
Wide Operating Voltage Range (
±
2 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)
APPLICATIONS
s
Audio Systems
s
Radio Cassettes
DESCRIPTION
The TK15326M 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 high level. The TK15326M
has a dual power supply and the input bias is direct
coupling at GND level. Because the distortion is very low,
the TK15326M fits various signals switching. It is best
suited for Hi-Fi devices. Operating voltage is wide, the
circuit plan is simple. The TK15326M is available in a small
plastic surface mount package (SSOP-12).
TK15326
VCC
Bch
OUT
1ch-in
Ach
1KEY
GND
VEE
11 Bch
10 OUT
9
8
7
Ach
2 KEY
NC
2ch-in
BLOCK DIAGRAM
VCC
Ach
+
-
1 ch out
1ch-in
1KEY
Bch
+
-
ORDERING INFORMATION
Ach
+
-
2 ch out
TK15326M
Tape/Reel Code
2ch-in
2KEY
Bch
+
-
GND
VEE
TAPE/REEL CODE
TL: Tape Left
June 1999 TOKO, Inc.
Page 1
TK15326
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 V
CC
+ 0.3 V
ANALOG SWITCH SECTION
Signal Input Voltage ........................ V
EE
- 0.3 to V
CC
+ 0.3
Signal Output Current ............................................. 3 mA
Operating Voltage Range ...............................
±2
to
±7
V
Maximum Input Frequency .................................. 100 kHz
TK15326M ELECTRICAL CHARACTERISTICS
Test conditions: V
CC
=
±4
V, T
A
= 25
°C,
unless otherwise specified.
SYMBOL
I
CC
PARAMETER
Supply Current
TEST CONDITIONS
MIN
TYP
3.2
MAX
5. 2
UNITS
mA
KEY CONTROL SECTION
V
IL
V
IH
Z
IN
Input Voltage Low Level
Input Voltage High Level
Input Impedance
Note 1
-0.3
1.8
50
+0.8
V
CC
+ 0.3
V
V
kΩ
ANALOG SWITCH SECTION
THD
N
L
ISO
SEP
DYN
GVA
V
cent
∆V
cent
I
IN
Z
OUT
Total Harmonic Distortion
Residual Noise
Isolation
Separation
Maximum Input Signal Level
Voltage Gain
Input-Output Terminal
Voltage
Output Terminal Voltage
Difference
Input Bias Current
Output Impedance
V
IN
= 1 Vrms, f = 1 kHz
Note 2
V
IN
= 1 Vrms, F = 10 kHz,
Note 3
V
IN
= 1 Vrms, f = 10 kHz,
Note 3
f = 1 kHz, THD = 0.1%
f = ~20 kHz
GND Bias
Between same channel
Note 4
DC Impedance
- 0.2
2.0
0
0
3
0.5
20
VCC
0.003
0.006
10
-75
-80
%
µVrms
dB
dB
Vrms
dB
+0.2
13
V
mV
µA
Ω
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 low level (about 1.4 V). Then the A channel input signal is outputted. The
change is carried out at high level.
Input Key
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 TK15326M is the direct
connecting with the GND bias. When connecting a capacitor, then to supply a bias voltage from
GND to input be any resistor is necessary.
Note 5: Power dissipation is 350 mW when mounted as recommended. Derate at 3.0 mW/°C for operation
above 25°C.
Logic
Input
VEE
Figure A
Figure B
Page 2
June 1999 TOKO, Inc.
TK15326
TEST CIRCUITS AND METHODS
SW6
VCC
SW3
50 kΩ
SW7
SW9
SW8
SW4
50 kΩ
33 µF +
SW2
1 kHz
1 Vrms
or
2 Vrms
10 kHz
1 Vrms
+
10 µF
SW5
+
10 µF
SW1
~
~
10 kΩ
V
~
V
_
THD
+
33 µF
VEE
1:
2:
3:
4:
The above condition represents 1ch.
The above conditions distortion rate of 1-Ach and dynamic range measurement.
SW5 is for residual noise measurement.
SW8 is for cross talk (ISO or SEP) measurement.
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 V
CC
. This current is
the supply current.
CONTROL LOW/HIGH LEVEL (FIGURE 2)
This level is to measure the threshold level.
1) Input, the V
CC
to Pin 1 and input V
EE
to Pin 12. (This
condition is the same with other measurements, omitted
from the next for simplicity)
2) Input to Pin 4 with sine wave (f = 1 kHz, V
IN
= 1 Vrms).
3) Connect an oscilloscope to Pin 3.
4) Drop the control voltage gradually from V
CC
until the
sine wave appears at the oscilloscope. This voltage is
the threshold level when the wave appears.
VCC
+
VCC
A
50 K
50 K
50 K
50 K
+
~
VEE
Cont.
+
VEE
Figure 1
June 1999 TOKO, Inc.
Figure 2
Page 3
TK15326
TEST CIRCUITS AND METHODS (CONT.)
CONTROL INPUT IMPEDANCE (FIGURE 3)
This is the input resistance of the control terminal.
1) Measure the inflow current from V
CC
to Pin 5.
2) Calculate:
IMP = V
CC
/ Inflow Current
This resistance is the input impedance.
VCC
+
VCC
+
Cont.
+
VEE
Figure 4
+
+
VEE
Figure 3
VOLTAGE GAIN (FIGURE 5)
This is the output level against input level.
1) Pin 5 is in the open condition, or low level.
2) Connect AC volt meters to Pin 4 and Pin 3.
(Using the same type meter is best)
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 V
CC
, or high 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.
TOTAL HARMONIC DISTORTION (FIGURE 4)
Use the lower distortion oscillator for this measurement
because distortion of the TK15326 is very low.
1) Pin 5 is in the open condition, or low 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 V
CC
, or high level.
6) Input the same sine wave to Pin 2.
7) Measure in the same way. This value is the distortion
of 1-Bch.
Page 4
June 1999 TOKO, Inc.
TK15326
TEST CIRCUITS AND METHODS (CONT.)
VCC
+
VCC
+
+
+
Cont.
+
VEE
Cont.
+
VEE
Figure 5
Figure 6
MAXIMUM INPUT LEVEL (FIGURE 6)
This measurement measures at output side.
1) Pin 5 is in the open condition, or low 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 V
CC
, or high 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.
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 low 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 V
CC
, or high 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
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