TOKO TK15121MTL Datasheet
TK15121
Grand Earthing System Audio Signal Mute IC
FEATURES
■ Wide Voltage Range (1.8 ~ 5.5 V)
■ Very Low Signal Distortion (typ. 0.005%)
■ High Maximum Input Voltage (max. 4.2 V
P-P
)
■ Very Low Standby Current (typ. 0.1 mA)
■ Minimal External Component Circuitry
DESCRIPTION
The TK15121M is a “MUTE IC” of the Grand Earthing
System that was developed as a low frequency signal
attenuation for audio products.
The mute function includes two channels which act
simultaneously by one control key.
The optional time for the Attack/Release can be set up by
the “Timing Control Capacitor”.
APPLICATIONS
■ Audio Systems
■ Television
■ VTR
■ MD
■ CD
20P
TK15121
IN/OUT 1
CONTROL
IN/OUT 2
V
CC
GND
MUTE
CAPACITOR
BLOCK DIAGRAM
DRIVER
AMP
CONTROL
LOGIC
ORDERING INFORMATION
TK15121M
Tape/Reel Code
TAPE/REEL CODE
TL: Tape Left
April 1999 TOKO, Inc. Page 1
TIME
CONTROL
TK15121
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC MAX) ....................................... 10 V
Power Dissipation (Note 3) ................................ 200 mW
Maximum Input Frequency (f
).........................100 kHz
MAX
TK15121M ELECTRICAL CHARACTERISTICS
Test conditions: V
LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU
= 3 V, T
CC
= 25 °C, f = 1 kHz, V
A
IN
= 4 V
Storage Temperature Range ................... -55 to +150 °C
Operating Temperature Range ...................-20 to +60 °C
unless otherwise specified.
P-P
V
CC
I
FFOCC
I
NOCC
tnerruC
tnerruC
TTAnoitaunettAR
IC
NO
IC
FFO
VWS
FFO
VWS
NO
V
TASO
DHT
egatloV
egatloV
egatloV
noitrotsiD
egatloVgnitarepO8.10.35.5V
ffOetuMtnerruCylppuS
nOetuMtnerruCylppuS
Ω
NI
1etoN,k3=4575Bd-
1.02.0Am
0.50.8Am
tnerruCegrahCnOetuM2etoN.noitcakcattA0161Aµ
tnerruCegrahcsiDffOetuM2etoN.noitcaesaeleR0.60.9Aµ
ffOetuMWSlortnoCetuM
nOetuMWSlortnoCetuM
noitarutaStuptuOnOetuM
cinomraHlatoTffOetuM
zHk02~=f500.0700.0%
3.0-5.0V
0.1V
CC
4.1Vm
AVGniaGzHk02~=f5.0-0 5.0+Bd
V
XAMNI
egatloVtupnImumixaM%10.0=DHT2.4V
3.0+V
P-P
Note 1: If a RIN other that 3 kΩ is used, then the volume attenuation and attack/release time changes.
Note 2: Attack is an action that changes to “mute on” from “mute off”, and release is action that changes to “mute off” from “mute on”.
Standard capacity for the timing control is 0.22 µF.
Note 3: Power dissipation is 200 mW when mounted as recommended. Derate at 1.6 mW/°C for operation above 25°C.
Page 2 April 1999 TOKO, Inc.
TEST CIRCUIT AND METHODS
TK15121
SG
SG
3 KΩ
3 KΩ
THD
THD
V
V
_
~
V1
V
V
_
~
A1
A2
V2
METHODS
1) Power supply current.
· Power supply current in the ‘MUTE OFF’.
When the control is ‘Lo (or open)’, measures the current ‘A1’.
· Power supply current in the ‘MUTE ON’.
When the control is’HI’, measures the current ‘A1’.
2) Attenuation volume.
· When the control is ‘Hi’, attenuation is calculated by the following formula.
ATT = 20Log
Pin 1(Pin 3) AC voltage at V1 = 3 V
(
Pin 1(Pin 3) AC voltage at V1 = 0 V
)
3) Current of the charge and discharge to the Condenser Pin.
· Current of the charge.
When the control is ‘Hi’ and the measurement is outflow current ‘A2’ when the Pin 4 voltage is 0.3 V.
· Current of the discharge.
When the control is ‘Lo (or open)’ and the measurement is inflow current ‘A2’ when the Pin 4 voltage is 0.3 V.
4) Voltage of the control switch.
· Voltage for the control ‘Hi’.
The first elevates Pin 2 voltage gradually from 0 V and if its action becomes ‘MUTE ON’ at the Pin 1 (Pin 3) output,
t hen measures the voltage ‘V1’.
· Voltage for the control ‘Lo’.
The first lowers Pin 2 voltage gradually from VCC, and if its action becomes ‘MUTE OFF’ at the Pin 1 (Pin 3)
output, then measures the voltage ‘V1’.
5) Output DC voltage at the ‘MUTE ON’.
When the control is ‘Hi’, measures the Pin 1 (Pin 3) output voltage at non-input.
6) Total harmonic distortion.
When the control is ‘Lo (or open)’, measures the distortion of the Pin 1 (Pin 3) output.
7) Signal Voltage Gain
When the control is ‘Lo (or open)’, signal gain is calculated by the following formula.
Pin 1(Pin 3) AC voltage
GV = 20Log
(
Pin 1(Pin 3) AC voltage front 3K
)
8) Maximum input signal voltage.
When the control is ‘Lo (or open)’, the first elevates input AC voltage of Pin 1 (Pin 3) gradually from 0 V
P-P
, and
if the distortion became 0.01 % at the Pin 1 (Pin 3) output, the measure the AC voltage.
April 1999 TOKO, Inc. Page 3
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