TA2145AF
2002-04-19
1
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA2145AF
3 V Stereo Headphone Amplifier (3 V USE)
The TA2145AF is developed for play-back stereo headphone
equipments (3 V USE).
It is built in dual preamplifiers, dual OCL power amplifiers,
motor governor, DC volume control and preamplifier on/off switch
etc.
Features
Built-in preamplifier
Input coupling condenser-less
Built-in input capacitor for reducing buzz noise
Low noise: V
ni
= 1.2 Vrms (typ.)
Preamplifier on/off switch.
Built-in power amplifier
OCL (Output condenser-less)
Voltage gain: G
V
= 31 dB (typ.)
Built-in motor governor (Current proportion type)
Built-in DC volume control function
ATT = 82dB (Ta = 25C, typ.)
Built-in bass boost function
Low supply current (V
CC
= 3 V, f = 1 kHz, PRE OUT = 100 mVrms, Ta = 25C, typ.)
Quiescent supply current
PRE + PW: I
CCQ
= 8.5 mA
GVN: I
CC
= 2.5 mA
0.1 mW 2 ch output
I
CC1
= 9.8 mA (R
L
= 32 )
I
CC2
= 10.5 mA (R
L
= 16 )
0.5 mW 2 ch output
I
CC3
= 14.0 mA (R
L
= 32 )
I
CC4
= 16.5 mA (R
L
= 16 )
Operating supply voltage range (Ta = 25C)
V
CC (opr)
= 1.8~3.6 V
GVN V
CC (opr)
= 2.1~3.6 V (Motor voltage = 1.8 V)
Weight: 0.32 g (typ.)
TA2145AF
2002-04-19
2
Block Diagram
NF
B
RF
IN
PRE
SW
GVN
V
CC
R
L
OUT
A
OUT
C
R
L
PW
IN
A
PRE
SW
V
REF
15
14
13
9
16
17
18
19
20
21
PRE
OUT
B
22
24
1
PRE
GND
IN
A
2
3
PRE
OUT
A
4
5
V
CTL
6
7
8
PW
IN
C
10
PW
GND
11
12
GVN
GND
23
V
REF
IN
B
PW
IN
B
V
CC
R
t
GVN
CTL
GVN
OUT
OUT
B
V
REF
BST SW
OUT
A
OUT
B
OUT
C
BST: OFF
VOL.
CONTROL
PWB
PWA
PWC
VOL.
RIPPLE
FILTER
VOL.
PREB
PREA
PRE:
OFF
M
NF
A
TA2145AF
2002-04-19
3
Terminal Explanation
(Terminal Voltage: Typical terminal voltage at no signal with test
circuit, V
CC
=
=
=
=
3 V, Ta
=
=
=
=
25C)
Terminal
No. Name
Function Internal
Circuit
Terminal
Voltage
(v)
1 PRE
GND The GND, except for power drive
stage and motor governer stage.
0
2 IN
A
23 IN
B
Input of preamplifier
1.2
3 NF
A
22 NF
B
NF of preamplifier
1.2
4 PRE
OUT
A
21 PRE
OUT
B
Output of preamplifier
7 OUT
B
8 OUT
A
9 OUT
C
Output of power amplifier
1.2
5 PW
IN
A
20 PW
IN
B
Input of power amplifier
1.2
6 V
CTL
The terminal of DC volume control
V
REF
3
2
500
W
500
W
RF
4
V
CC
5
V
REF
RF
10 k
W
V
CC
6
V
REF
TA2145AF
2002-04-19
4
Terminal
No. Name
Function Internal
Circuit
Terminal
Voltage
(v)
10 PW
IN
C
Input of center amplifier
1.2
11
PW GND
GND for power drive stage
0
12
GVN GND
GND for motor governor stage
0
13 GVN
OUT Motor
terminal
14
GVN CTL
The terminal of motor speed control
15 Rt
The terminal of amateur
compensation resistor
16 GVN
V
CC
V
CC
for motor governor stage
3
17 V
CC
V
CC
for preamplifier stage and
power amplifier stage.
3
18 PRE
SW
Muting switch of preamplifier
Preamp. on: "L" level/open
Preamp. off: "H" level
Refer to application note
2 k
W
20 k
W
30 k
W
10
V
REF
V
REF
14
16
15
13
M
18
TA2145AF
2002-04-19
5
Terminal
No. Name
Function Internal
Circuit
Terminal
Voltage
(v)
19
RF IN
Ripple filter of power supply
2.5
24 V
REF
Reference voltage
Preamplifier and power amplifier
operate on this reference.
1.2
V
CC
4 k
W
19
24
4.
7 k
W
1.
3 k
W
10 k
W
TA2145AF
2002-04-19
6
Application Note
V
CC
and GND
This IC has two V
CC
terminals and three GND terminals. Pattern layout should be designed carefully to
reduce the common impedance.
V
CC
V
CC
(pin 17) ----------------- Preamplifier stage and power amplifier stage.
GVN V
CC
(pin 16) --------- Motor governor stage.
GND
PRE GND (pin 1)------------Preamplifier stage, and power amplifier stage except for the power drive stage.
PW GND (pin 11) -----------Power drive stage of power amplifier.
GVN GND (pin 12) ---------Motor governor stage.
V
REF
It is necessary to stabilize the V
REF
circuit, because the internal circuit operate on this reference.
RF IN
As this terminal is an input terminal of the ripple filter, it cannot supply a power supply to other ICs etc.
Preamplifier
Input signal should be applied to V
REF
standard, otherwise pop noise become bigger when V
CC
is turned on
and off.
Power amplifier
It is necessary to insert the coupling capacitor through the PW IN terminal. In case that DC current or DC
voltage is applied to the PW IN terminal, the internal circuit has unbalance and the power amplifier doesn't
operate normally.
Operating supply voltage range of motor governor stage
As for the minimum of operating supply voltage range, the motor voltage is 1.8 V.
In case that it is more than 1.8 V, the low voltage performance becomes bad.
PRE SW sensitivity (Ta = 25C)
Supply voltage V
CC
(V)
PRE SW
T
e
r
m
in
a
l
DC v
o
lt
a
g
e
V
18
(V
)
1.5 V
1.8 V
0.5 V
0 1.5
2.0
2.5
3.5
4.0
3.0
2
4
1
3
1.2 V
3.0 V
3.6 V
"H"
PRE AMP: OFF
TA2145AF
2002-04-19
7
Maximum Ratings
(Ta
=
=
=
=
25C)
Characteristic Symbol
Rating
Unit
Supply voltage
V
CC
4 V
(Note 1)
400
Power dissipation
P
D
(Note 2)
925
mW
Output current (PW AMP.)
I
O (PW)
200
mA
Output current (GVN)
I
O (GVN)
700
mA
Operating temperature
T
opr
-
25~75 C
Storage temperature
T
stg
-
55~150 C
Note 1: IC only: Derated above Ta
=
25C in the proportion 3.2 mW/C
Note 2: IC
+
PCB (TOSHIBA typical PCB): Derated above Ta
=
25C in the proportion7.4 mW/C
TA2145AF
2002-04-19
8
Electrical Characteristics
(Unless otherwise specified, V
CC
=
=
=
=
3 V, Ta
=
=
=
=
25C, f
=
=
=
=
1 kHz, SW2: a, SW5: OPEN
Preamplifier: R
g
=
=
=
=
2.2 k
W
W
W
W
, R
L
=
=
=
=
10 k
W
W
W
W
, SW1: ON, SW3: b, SW4: b
Power amplifier: R
g
=
=
=
=
600
W
W
W
W
, R
L
=
=
=
=
16
W
W
W
W
, Vol.: max, SW1: OPEN, SW3: a, SW4: a
Motor governor: I
m
=
=
=
=
100 mA, SW1: OPEN, SW3: b, SW4: b)
Characteristic Symbol
Test
circuit
Test condition
Min
Typ.
Max
Unit
I
CCQ1
Pre off, V
in
=
0, Vol.: min,
SW4: b, SW5: ON
7.5 13
Quiescent supply current
I
CCQ2
V
in
=
0, Vol.: min, SW4: b
8.5 14.5
mA
Open loop voltage gain
G
VO
V
o
= -
10dBV, SW2: b
86
dB
Closed loop voltage gain
G
VC
V
o
= -
10dBV
35
dB
Maximum output voltage
V
om
THD
=
1% 550
720
mVrms
Total harmonic distortion
THD1
V
o
= -
10dBV
0.02 0.3 %
Equivalent input noise
voltage
V
ni
R
g
=
2.2 k
W
, SW1: OPEN
BPF
=
20 Hz~20 kHz,
NAB (G
V
=
35dB, f
=
1 kHz)
1.2 2.4
m
Vrms
Cross talk
CT1
V
o
=
-
10dBV
70
dB
Ripple rejection ratio
RR1
f
r
=
100 Hz, V
r
= -
20dBV
48
dB
Preamplifier muting
attenuation
ATT1
V
o
= -
10dBV, SW5: OPEN
ON
80
dB
Preamplifier on voltage
V
18 (ON)
0
0.5 V
P
r
e am
p
.
Preamplifier off voltage
V
18 (OFF)
V
CC
=
1.8 V
1.5
1.8 V
Voltage gain
G
V
V
o
= -
10dBV
29 31 33 dB
Channel balance
CB
V
o
= -
10dBV
-
1.5 0
+
1.5
dB
Output power 1
P
o1
R
L
=
16
W
, THD
=
10% 17
28
mW
Output power 2
P
o2
R
L
=
32
W
, THD
=
10%
20
mW
Total harmonic distortion
THD2
P
o
=
1m W
0.5
%
Output noise voltage
V
no
R
g
=
600
W
, SW3: b
BPF
=
20 Hz~20 kHz
270 400
m
Vrms
Ripple rejection ratio
RR2
f
r
=
100 Hz, V
r
= -
20dBV
52
dB
Cross talk
CT2
V
o
= -
10dBV
32
dB
P
o
wer am
p.
Dc volume maximum
attenuation
ATT2
V
o
= -
10dBV, SW4: a
b
(Vol.: max
min)
82
dB
Supply current
I
CC
I
m
=
0
2.5 3.5 mA
Saturation voltage
V
CE (sat)
I
m
=
200 mA
0.5 V
Reference voltage
,
V
REF
I
m
=
100
mA
0.76 0.81 0.86
V
Reference voltage
fluctuation 1
,
V
REF1
V
CC
=
2.1~3.6 V
0.25
%/V
Reference voltage
fluctuation 2
,
V
REF2
I
m
=
25~250 mA
0.003
%/mA
Reference voltage
fluctuation 3
,
V
REF3
Ta
= -
25~75C
0.005
%/C
Current ratio
K
34.5 37.5 40.5
Current ratio fluctuation 1
,
K1
V
CC
=
2.1~3.6 V
0.25
%/V
Current ratio fluctuation 2
,
K2
I
m
=
25~250 mA
0.08
%/mA
M
o
t
o
r go
v
e
rnor
Current ratio fluctuation 3
,
K3
Ta
= -
25~75C
0.005
%/C
TA2145AF
2002-04-19
9
Test Circuit
(a)
(b)
TA2145AF
11
12
1
m
F
Rg
=
600
W
10
9
8
7
6
5
4
3
2
IN
A
1
PRE
GND
GVN
CTL
IN
B
V
REF
14
13
15
16
17
18
19
20
21
22
23
24
470 k
W
470 k
W
18 k
W
22
m
F
220
m
F
8200 pF
(b) (a)
SW2a
R
L
R
L
PW OUT
A
PW OUT
C
PW OUT
B
(a) (b)
SW4
10 k
W
1
m
F
600
W
PW IN
A
10 k
W
PRE OUT
A
V
REF
V
REF
1
m
F
SW3a
NF
A
PRE
OUT
A
PW
IN
A
V
CTL
OUT
B
OUT
A
OUT
C
PW
IN
C
PW
GND
GVN
GND
NF
B
PRE
OUT
B
PW
IN
B
RF IN PRE
SW
PW
V
CC
GVN
V
CC
Rt
GVN
OUT
470 k
W
1000 pF
2.
2 k
W
22
m
F
1000 pF
2.
2 k
W
PRE IN
B
SW1b
PRE
IN
A
Rg
=
600
W
SW1a
Rg
=
600
W
470 k
W
220
m
F
22
m
F
8200 pF
18 k
W
SW2b
(b) (a)
PRE OUT
B
10 k
W
V
REF
100
m
F
1
m
F
600
W
Rg
=
600
W
PW IN
B
(a)
(b) SW3b
470
W
SW5
47
m
F
47
m
F
3.6 k
W
5
k
W
5
W
V
CC
V
REF
180
W
1
m
F
470
W
TA2145AF
2002-04-19
10
Characteristic Curves
( Unless otherwise specified, V
CC
=
=
=
=
3 V, Ta
=
=
=
=
25C, f
=
=
=
=
1 kHz,
Preamplifier: R
g
=
=
=
=
2.2 k
W
W
W
W
, R
L
=
=
=
=
10 k
W
W
W
W
Power amplifier: R
g
=
=
=
=
600
W
W
W
W
, R
L
=
=
=
=
16
W
W
W
W
, Vol.
=
=
=
=
max
Motor governor: I
m
=
=
=
=
100 mA)
Maxi
mu
m
o
u
t
put
vol
t
ag
e V
om
(mV
rm
s
)
Cr
o
s
s
t
a
lk
C
T
(
d
B)
Supply voltage V
CC
(V)
I
CCQ
, I
CC
V
CC
Qui
e
s
c
en
t su
ppl
y
cu
rr
ent
I
CCQ
(mA
)
S
uppl
y
cu
rre
nt
I
CC
(m
A
)
Supply voltage V
CC
(V)
V
O (DC)
V
CC
Outp
ut D
C
vol
t
a
ge
V
O
(DC)
(V
)
Frequency f (Hz)
PRE G
VO
, G
VC
f
Ope
n
l
o
op
vol
t
ag
e
G
VO
(dB
)
C
l
o
se
d l
o
op v
o
l
t
age
G
VC
(
d
B
)
Frequency f (Hz)
PRE
CT f
Supply voltage V
CC
(V)
PRE
V
om
V
CC
Output voltage V
o
(mVrms)
PRE
THD V
o
T
o
t
a
l
ha
rm
oni
c
di
st
or
ti
on
TH
D
(%
)
ICCQ1 (PRE
+
PW, Vol.: min)
0 1.5
2.0
2.5
3.5
4.0
3.0
12
0
4
16
8
ICCQ2 (PW only, Vol.: min)
ICC (GVN: Im
=
0)
0 1.5
2.0
2.5
3.5
4.0
3.0
1.5
0
0.5
2.5
1.0
2.0
VREF, PW OUT, PRE OUT
10 100 1
k
100 k
10 k
60
0
20
100
40
80
Vo
=
-
10dBV
GVO
GVC
10 100 1
k
100 k
10 k
60
80
70
40
50
Vo
=
-
10dBV
0 1.5
2.0
2.5
3.5
4.0
3.0
500
100
1000
200
THD
=
1%
f = 10 kHz
f = 100 Hz
f = 1 kHz
1 10 100
10000
1000
1
0.01
0.03
10
3
3
0.1
TA2145AF
2002-04-19
11
Outp
ut pow
er
P
o
(
m
W
)
Cr
o
s
s
t
a
lk
C
T
(
d
B)
Supply voltage V
CC
(V)
PRE V
ni
V
CC
E
qui
val
ent
i
n
p
u
t
noi
s
e
V
ni
(
m
V
rm
s
)
Supply voltage V
CC
(V)
PRE RR
V
CC
R
i
ppl
e
rej
e
cti
on
rati
o R
R
(dB
)
Frequency f (Hz)
PW G
V
f
V
o
l
t
ag
e
G
V
(
d
B
)
Frequency f (Hz)
PW CT
f
Supply voltage V
CC
(V)
PW P
o
V
CC
Output power P
o
(mW)
PW THD
P
o
T
o
t
a
l
ha
rm
oni
c
di
st
or
ti
on
TH
D
(%
)
0 1.5
2.0
2.5
3.5
4.0
3.0
fr = 100 Hz
Vr =
-
20dBV
40
80
70
10
50
20
60
30
5
0.5
1
20
2
10
0 1.5
2.0
2.5
3.5
4.0
3.0
BST
=
ON
20 100
1
k
100 k
10 k
40
20
30
60
50
Vo
=
-
10dBV
BST
=
OFF
20
100
1 k
10 k
100 k
BST = ON
Vo
=
-
10dBV
BST = OFF
20
60
50
0
30
10
40
THD
=
10%
0 1.5
2.0
2.5
3.5
4.0
3.0
2
100
10
RL
=
16
W
32
W
0.2
1
100
10
3
0.2
30
1
10
f
=
10 kHz
VCC
=
3 V
RL
=
16
W
100 Hz
1 kHz
TA2145AF
2002-04-19
12
R
e
fe
ren
c
e v
o
l
t
ag
e fl
u
c
tu
ati
o
n
D
V
REF
(mV
)
curr
en
t
r
a
ti
o
fl
uct
u
a
t
i
on
D
K
R
e
fe
ren
c
e v
o
l
t
ag
e fl
u
c
tu
ati
o
n
D
V
REF
(mV
)
C
u
rr
ent
r
a
ti
o
fl
uct
uati
on
D
K
Volume ratio
PW V
o
Vol.
Outp
ut
vol
t
ag
e V
o
(mW
)
Volume ratio
PW V
no
Vol.
Outp
ut noi
s
e
v
o
l
t
a
ge
V
no
(
m
V
rms
)
Volume ratio
RR Vol.
R
i
ppl
e
rej
e
cti
on
rati
o R
R
(dB
)
Supply voltage V
CC
(V)
GVN
D
V
REF
,
D
K V
CC
Motor current I
m
(mA)
GVN
D
V
REF
,
D
K I
m
Ambient temperature Ta (C)
I
CCQ
, I
CC
Ta
Quies
c
en
t
S
u
pply
cur
r
e
n
t I
CCQ
(mA
)
S
uppl
y
cu
rre
nt
I
CC
(
m
A
)
Volume Resistance
(Pin@
-
GND)
Ratio
=
Volume resistance
0dB
=
-
10dBV
-
30
-
90
-
70
10
-
50
-
10
0
0.2
0.4
0.8
1
0.6
Volume Resistance
(Pin@
-
GND)
Ratio
=
Volume resistance
100
10
30
500
50
300
0
0.2
0.4
0.8
1
0.6
Resistance
(Pin@
-
GND)
Volume ratio
=
Volume resistance
0dB
=
-
10dBV, Vr
=
-
20dBV
50
80
70
40
60
0
0.2
0.4
0.8
1
0.6
D
VREF
1.5
2.0
2.5
3.5
4.0
3.0
0.0
-
7.5
-
5.0
7.5
-
2.5
5.0
2.5
D
K
0
-
10
-
5
10
5
0
50
100
250
300
200
150
D
VREF
D
K
8
0
4
16
12
-
20
0
60
80
40
20
ICCQ1 (PRE + PW, Vol. = min)
ICCQ2 (PW only, Vol. = min)
ICC (GVN: Im = 0)
TA2145AF
2002-04-19
13
T
o
t
a
l
ha
rm
oni
c
di
st
or
ti
on
TH
D
(%
)
V
o
l
t
ag
e
G
V
(
d
B
)
Ambient temperature Ta (C)
V
O (DC)
Ta
Outp
ut
vol
t
ag
e V
O (DC)
(V
)
Ambient temperature Ta (C)
PRE G
V
, V
om
Ta
V
o
l
t
ag
e g
a
i
n
G
V
(dB
)
Ambient temperature Ta (C)
PRE THD
Ta
T
o
t
a
l
ha
rm
oni
c
di
st
or
ti
on
TH
D
(%
)
Outp
ut
P
o
we
r P
o
(mW
)
Ambient temperature Ta (C)
PW
G
V
, P
o
Ta
Ambient temperature Ta (C)
PW
THD Ta
Maxi
mu
m
o
u
t
put
vol
t
ag
e V
om
(mV
r
m
s
)
Ambient temperature Ta (C)
GVN
D
V
REF
,
D
K Ta
R
e
fe
ren
c
e v
o
l
t
ag
e fl
u
c
tu
ati
o
n
D
V
REF
(mV
)
C
u
rr
ent
r
a
ti
o
fl
uct
uati
on
D
K
-
20
0
20
60
80
40
1
0
0.5
1.5
VREF, PW OUT, PRE OUT
GV: Vo
=
-
10dBV
Vom: THD
=
1%
Vom
-
20
0
20
60
80
40
760
600
720
800
640
680
38
30
34
40
32
36
GV
GV: Vo
=
-
10dBV
Po: THD
=
10%
-
20
0
20
60
80
40
40
10
30
50
20
25
30
35
GV
Po
-
20 0 20
60
80
40
0.1
0.001
1
0.01
Vo
=
-
10dBV
-
20 0 20
60
80
40
Po
=
1 mW
2
0.1
10
0.5
0.2
1
5
D
VREF
-
20 0 20
60
80
40
2
-
6
6
-
2
-
4
0
4
D
K
TA2145AF
2002-04-19
14
Application Circuit
1000
p
F
10 k
W
33 k
W
33 k
W
NF
B
RF
IN
PRE
SW
GVN
V
CC
R
L
OUT
A
OUT
C
R
L
PW
IN
A
15
14
13
9
16
17
18
19
20
21
PRE
OUT
B
22
24
1
PRE
GND
IN
A
2
3
PRE
OUT
A
4
5
V
CTL
6
7
8
PW
IN
C
10
PW
GND
11
12
GVN
GND
23
V
REF
IN
B
PW
IN
B
PW
V
CC
R
t
GVN
CTL
GVN
OUT
OUT
B
V
REF
BST SW
OUT
A
OUT
B
OUT
C
BST: OFF
PRE
OFF
M
TA2145AF
NF
A
470 k
W
18 k
W
470 k
W
470
W
22
m
F
1
m
F
8200 pF
12 k
W
0.
1
m
F
0.
1
m
F
0.1
m
F
5 k
W
3.6 k
W
1
m
F
180
W
0.
1
m
F
47
m
F
V
CC
100
m
F
22
m
F
1000
p
F
470 k
W
18 k
W
8200 pF 1
m
F
470
W
22
m
F
470 k
W
PR
E IN
B
PR
E IN
A
TA2145AF
2002-04-19
15
Package Dimensions
Weight: 0.32 g (typ.)
TA2145AF
2002-04-19
16
TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor
devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical
stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of
safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of
such TOSHIBA products could cause loss of human life, bodily injury or damage to property.
In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as
set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and
conditions set forth in the "Handling Guide for Semiconductor Devices," or "TOSHIBA Semiconductor Reliability
Handbook" etc..
The TOSHIBA products listed in this document are intended for usage in general electronics applications
(computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances,
etc.). These TOSHIBA products are neither intended nor warranted for usage in equipment that requires
extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or
bodily injury ("Unintended Usage"). Unintended Usage include atomic energy control instruments, airplane or
spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments,
medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in this
document shall be made at the customer's own risk.
The products described in this document are subject to the foreign exchange and foreign trade laws.
The information contained herein is presented only as a guide for the applications of our products. No
responsibility is assumed by TOSHIBA CORPORATION for any infringements of intellectual property or other
rights of the third parties which may result from its use. No license is granted by implication or otherwise under
any intellectual property or other rights of TOSHIBA CORPORATION or others.
The information contained herein is subject to change without notice.
000707EBA
RESTRICTIONS ON PRODUCT USE
This datasheet has been download from:
www.datasheetcatalog.com
Datasheets for electronics components.
PDF 
ZIP