TOKO TK15328MTL Datasheet
TK15328
Audio Analog Switch
FEATURES
■ 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)
■ Output Parallel Connection Possible
DESCRIPTION
The TK15328M is an Analog Switch IC that was developed
for audio frequency. Function is to select one output from
two inputs, and has floating position too. The channel can
be changed by two control levels and in a device that
includes two circuits. The TK15328M has a dual power
supply and the input bias is direct coupling at GND level.
Because the distortion is very low, the TK15328M fits
various signals switching. It is best suited for Hi-Fi devices.
Operating voltage is wide, the circuit plan is simple. The
TK15328M is available in a small plastic surface mount
package (SSOP-12).
APPLICATIONS
■ Audio Systems
■ Radio Cassettes
1ch-in 2ch-in
TK15326
V
CC
Bch
OUT
Ach
1KEY
GND
V
EE
11
Bch
10
OUT
9
Ach
8
2 KEY
NC
7
BLOCK DIAGRAM
V
CC
1 ch out
2 ch out
1KEY
2KEY
GND
V
EE
ORDERING INFORMATION
TK15328M
Tape/Reel Code
TAPE/REEL CODE
TL: Tape Left
1ch-in
2ch-in
Ach
Bch
Ach
Bch
+
-
+
-
+
-
+
-
Logic
June 1999 TOKO, Inc. Page 1
TK15328
Logic
Input Key
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
TK15328M 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............................... ±2 to ±7 V
Maximum Input Frequency..................................100 kHz
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Note 1: The KEY input equivalent circuit is shown in Figure A.
When the control pin is open, it is outputted low level. The TK15328 is controlled by two
values,
and the function table is described in the block diagram.
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 terminal
connects to ground through 10 kΩ resistor and capacitor.
Note 4: Input equivalent circuit is shown in Figure B. The standard application of TK15328M 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.
Page 2 June 1999 TOKO, Inc.
tnerruCsaiBtupnI4etoN5.0Aµ
ecnadepmItuptuOecnadepmICD02
V
CC
Input
Figure A
Figure B
Ω
V
EE
TEST CIRCUITS AND METHODS
V
SW6
SW7
CC
SW3
50 kΩ
TK15328
1 kHz
1 Vrms
or
2 Vrms
SW9
~
10 kHz
1 Vrms
~
SW8
+
10 µF
10 kΩ
SW5
+
10 µF
SW4
SW2
V
~
V
_
1: The above condition represents 1ch.
2: The above conditions distortion rate of 1-Ach and dynamic range measurement.
3: SW5 is for residual noise measurement.
4: 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) Contact Pin 5 to VCC, Pin 8 is low level or open.
2) Measure the inflow current to Pin 1 from VCC. This current is
the supply current.
AV
CC
50 kΩ
33 µF
+
THD
SW1
L
+
33 µF
SW1
LHH
V
EE
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) Pin 8 is low level or the open, and elevate Pin 5 voltage
gradually from 0 V until the sine wave appears at the
oscilloscope. This voltage is the threshold level when
the wave appears.
V
CC
+
50 K
50 K
Figure 1
50 K
50 K
+
~
V
EE
Cont.
+
V
EE
Figure 2
June 1999 TOKO, Inc. Page 3
TK15328
V
CC
++
V
EE
+
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 VCC to Pin 5.
2) Calculate:
IMP = VCC / Inflow Current
This resistance is the input impedance.
V
CC
+
Figure 4
+
V
EE
Figure 3
VOLTAGE GAIN (FIGURE 5)
This is the output level against input level.
1) Connect VCC to Pin 5, Pin 8 is in the open condition, or
low level.
2) Connect AC volt meters to Pin 4 and Pin 3.
TOTAL HARMONIC DISTORTION (FIGURE 4)
Use the lower distortion oscillator for this measurement
because distortion of the TK15328 is very low.
1) Connect VCC to Pin 5, Pin 8 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 reverse condition at Pin 5 and Pin 8.
(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, reverse conditions at Pin 5 and Pin 8.
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.
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.
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