TA2145F ,3V STEREO GEADPHONE AMPLIFIER (3V USE)FEATURES
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TA2145F
3V STEREO GEADPHONE AMPLIFIER (3V USE)
TOSHIBA TA2145F
TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT SILICON MONOLITHIC
TA21l45F
3V STEREO HEADPHONE AMPLIFIER (3V USE)
The TA2145F is developed for play-back stereo headphone
equipments (3V USE).
It is built in dual preamplifiers, dual OCL power
amplifiers, motor governor, DC volume control and
preamplifier on/off switch etc.
FEATURES
0 Built-in preamplifier
Input coupling condenser-less
Built-in input capacitor for reducing buzz noise
Low noise : Vni = 1.2 PA/rms (Typ.) SSOP24-P-300-1.00
Preamplifier on/off switch. Weight 5 0.32 g (Typ.)
o Built-in power amplifier
OCL (Output condenser-Iess)
Voltage gain : GV = 31 dB (Typ.)
o Built-in motor governor
Current proportion type
c Built-in DC volume control function
DC volume maximum attenuation : ATT = 82 dB (Ta = 25°C, Typ.)
Built-in bass boost function
0 Low supply current (VCC = 3V, Ta = 25°C, Typ.)
PRE + PW (f = 1kHz, PRE OUT = 100 mVrms)
No Signal Output Power
(Vol : MIN.) 0.1 mW x 2 0.5 mW x 2
RL = 160 8.5 mA 10.5 mA 16.5 mA
RL = 320 8.5 mA 9.8 mA 14 mA
GVN : ICC = 2.5 mA
0 Operating supply voltage range (Ta = 25°C)
PRE + PW : VCC(opr) = 1.8~3.6V
GVN i VCC(opr) = 2.1--3.6V (Motor voltage = 1.8 V) 980910EBA1
OTOSHIBA is continually working to improve the quality and the 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 observe standards of safety, and to avoid
situations in which a malfunction or failure of a TOSHIBA product could cause loss of human life, bodily injury or
damage to property. In developing your designs, please ensure that TOSHIBA products are used within sdecified
operating ranges as set forth in the most recent products specifications. Also, please keep in mind the precautions
and conditions set forth in the TOSHIBA Semiconductor Reliability Handbook.
OThe products described in this document are subject to the foreign exchange and foreign trade laws.
OThe 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 propert or other rights of the third
parties which may result from its use. No license is granted by implication or ot erwise under any intellectual
property or other rights of TOSHIBA CORPORATION or others.
OThe information contained herein is subject to change without notice.
1999-10-22 1/15
TOSHIBA TA2145F
BLOCK DIAG RAM
(3t + +
I PRE PW RF
VREF liNIB NFB OUT IN IN
h Ch PCh BA B
pr, Ix
-(ii) 23 22 12..1.i 1?..y 4'9;
RIPPLE
FILTER
VOL. I
E» VOL.
CONTROL
1 2 J W19 11 12
PRE INA OUTB OUTA OUTC PW PW GVN
GND INC GND GND
o OUTA
I Mv', l :H rin
o OUTC
Il- BST SW R
VREF <1 . . . a o- L
BST : OFF 0 OUTB
1999-10-22 2/15
TOSHIBA TA2145F
TERMINAL EXPLANATION
TERMINAL VOLTAGE : Typical terminal voltage at no signal with test circuit (VCC = 3V, Ta = 25°C)
TERMINAL TERMINAL
No. NAME FUNCTION INTERNAL CIRCUIT VOLTAGE (V)
The GND, except for power
1 PRE GND drive stage and motor - 0
governer stage.
Input of preamplifier 1.2
23 INB
NF of preamplifier 1.2
22 NFB
4 PRE OUTA
Output of preamplifier
21 PRE OUTB
7 OUTB
8 OUTA Output of power amplifier
9 OUTC
5 PW INA
Input of power amplifier 1.2
20 PW INB
6 V The terminal of DC volume
CTL control
1999-10-22 3/15
TOSHIBA TA2145F
TERMINAL TERMINAL
No. NAME FUNCTION INTERNAL CIRCUIT VOLTAGE (V)
10 PW INC Input of center amplifier 1.2
Ci1vn- VREF
11 PW GND GND for power drive stage - 0
12 GVN GND GND for motor governor stage - o
13 GVN OUT Motor terminal -
14 GVN CTL The terminal of motor speed -
control
15 Rt The terminal of amateur
compensation resistor
16 GVN VCC VCC for motor governor stage f? 3
17 VCC VCC for pretyplif/er stage and - 3
power amplifier stage.
Mutiny switch of preamplifier _$_
Preamp. on : "L" levellopen " " l
18 PRE SW " " -
Preamp. off : H level
Refer to application note
1999-10-22 4/15
TOSHIBA
TA2145F
TERMINAL TERMINAL
No. NAME FUNCTION INTERNAL CIRCUIT VOLTAGE (V)
. . '.19 J,;
19 RF IN Ripple filter of power supply Vcc 2.5
Reference voltage t ?
0 Preamplifier and power a
24 VREF amplifier operate on this 4
reference.
1999-10-22 5/15
TOSHIBA TA2145F
APPLICATION NOTE
Vcc and GND
This IC has two VCC terminals and three GND terminals. Pattern layout should be designed carefully
to reduce the common impedance.
VCC (pin 17) : Preamplifier stage and power amplifier stage.
GVN VCC (pin 16) : Motor governor stage.
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.
It is necessary to stabilize the VREF circuit, because the internal circuit operate on this reference.
As thisterminal 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 VREF standard, otherwise pop noise become bigger when VCC 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 1.8V.
In case that it is more than 1.8V, the low voltage performance becomes bad.
1999-10-22 6/15
TOSHIBA
7. PRE SW sensitivity (Ta = 25°C)
PRE SW
'ii?. gill,"
E 3 PRE AMP. : OFF si 3.25V
2 2 1.8v//
3 1.75v
i W7 1.2V
- 0.5V Cr''',',,''; aci2''..'Eh
Ae, Af /V
0 h: 2.0 2.5 3.0 3.5 4.0
SUPPLY VOLTAGE vcc (V)
MAXIMUM RATINGS (Ta = 25°C)
CHARACTERISTIC SYMBOL RATING UNIT
Supply Voltage VCC 4 V
P Di . ti n P Note 1 400 mW
ower Issnpa IO D Note 2 925
Output Current (PW AMP.) lo (PW) 200 mA
Output Current (GVN) lo (GVN) 700 mA
Operating Temperature Topr - 25--75 "C
Storage Temperature Tstg - 55--150 "C
(Note 1) : IC only :
Derated above Ta = 25°C in the proportion 3.2 mW/°C
TA2145F
(Note 2) : |C+PCB (TOSHIBA typical PCB) : Derated above Ta = 25°C in the proportion
7.4 mW/°C
1999-10-22 7/15
TOSHIBA TA2145F
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, VCC = 3V, Ta = 25°C, f = 1 kHz, SW2 : a, SW5 : OPEN
Preamplifier : Rg = 2.2 kn, RL = 10 k0, SW1 : ON, SW3 : b, SW4 : b
Power amplifier: Rg = 600 n, RL = 16 n, Vol : MAX, SW1 : OPEN, SW3 : a, SW4 : a
Motor governor: lm = 100 mA, SW1 : OPEN, SW3 : b, SW4 : b
CHARACTERISTIC SYMBOL CIR- TEST CONDITION MIN. TYP. MAX. UNIT
Quiescent Supply Current 1 ICCQ1 - 55150-2: :W5=:0(l)|:l/OI . MIN, - 7.5 13 mA
Quiescent Supply Current 2 lcco2 - Vin = o, Vol : MIN, SW4 : b - 8.5 14.5
Open Loop Voltage Gain GVO - Vo = - 10 dBV, SW2 : b - 86 - dB
Closed Loop Voltage Gain GVC - Vo = - 10 dBV - 35 - dB
Maximum Output Voltage Vom - THD = 1% 550 720 - ml/rms
Total Harmonic Distortion THD1 - Vo = - 10 dBV - 0.02 0.3 %
a..' Equivalent Input Noise Rg = 2.2 kn, SW1 : OPEN
E Voltage vni - BPF = 20 Hz-20 kHz, NAB - 1.2 2.4 /Nrms
< (GV = 35 dB, f = 1kHz)
'il) CrossTalk CT1 - Vo = -10dBV - 70 - dB
Ripple Rejection Ratio RR1 - fr = 100 Hz, Vr = -20dBV - 48 - dB
Preamplifier Muting Vo = - 10 dBV
Attenuation ATT1 - sws : OPEN-PON - 80 - dB
Preamplifier On Voltage V18(OFF) - V = 1 8V 0 - 0.5 V
Preamplifier Off Voltage V18(OFF) - CC . 1.75 - 1.8 V
Voltage Gain G - 29 31 33 dB
Channel Balance CEY - Vo = -10dBV -1.5 0 +1.5 dB
Output Power 1 Pol - RL = 16 Q, THD = 10% 17 28 - mW
.2 Output Power 2 P02 - RL = 32 n, THD = 10% - 20 - mW
it Total Harmonic Distortion THD2 - Po = 1 mW - 0.5 - %
'i Output Noise Voltage vno - 33:33 Sz'jggigf - 270 400 PA/rms
o Ripple Rejection Ratio RR2 - fr = 100 Hz, Vr = -20dBV - 52 - dB
Ct.. CrossTalk CT2 - Vo = -10dBV - 32 - dB
. Vo = -10dBV
'dtctetetr,T1oen Maximum ATT2 - SW4 : a-ab - 82 - dB
(Vol : MAX-9MIN)
Supply Current ICC - lm = 0 - 2.5 3.5 mA
Saturation Voltage VCE (sat) - Im = 200 mA - - 0.5 V
m Reference Voltage VREF - lm = 100 mA 0.76 0.81 0.86 V
ji' ',tfcetrue:t,c.2/ttage AVREF1 - Vcc = 2.1--3.6V - 0.25 - %/V
Ll,4 Reference Volta e
ii Fluctuation 2 g AVREF2 - Im = 25~250 mA - 0.003 - %/ mA
0: Reference Voltage 0 o
g Fluctuation 3 AVREF3 - Ta = -25--75 c - 0.005 - %/ C
E Current Ratio K - 34.5 37.5 40.5
Current Ratio Fluctuation 1 AK1 - VCC = 2.1~3.6V - 0.25 - %/V
Current Ratio Fluctuation 2 AK2 - Im = 25~250 mA - 0.08 - %/ mA
Current Ratio Fluctuation 3 AK3 - Ta = -25--7YC - 0.005 - % /°C
1999-10-22 8/15
TOSHIBA
TEST CIRCUIT
TA2145F
Rg=6000
VREF ©
PREOUTB
230/.” (b)(a)
PRE INB SW1b 23/4: L t
C) ti"st I 4700 u. sws t
3‘33: N. Q, I
"g,' 'a, 470 k9. g
Rg=6000 A F N _ +
+ LA. $.84 "s j,,
.§--g::~.—@@@@\29@@@
R9=5009 rN F N PRE PW RFIN PW GVN GVN GVN
V IN NF PRE Rt
'o-still', REF B B OUTB INB sw Vcc vcc CTL OUT
PREINA a
TA2145 F
PRE PRE PW PW PW GVN
GND [NA NFA OUTA INA VCTL OUTB OUTA OUTc INC GND GND
f1®®@®®4\@@@®i)—12
T 47914) I
470k!)
+ C' PW OUTA
22YF 4709 swa RL
- 8200pF
+ v (a) (b) PW OUTC
220psF(b) (a) 18k9.
swza AAA RL
OPW OUTB
PREOUTA
1999-10-22 9/15
TOSHIBA
TA2145F
CHARACTERISTIC CURVES
Unless otherwise specified VCC = 3V, Ta = 25°C, f = 1 kHz
600 fl, RL = 16 n, Vol = MAX.
100 mA
Preamplifier
Power amplifier : Rg
Motor governor: Im
ICCQ, ICC - VCC
IcCQ1 (PRE + PW, Vol. : MIN.)
ICCQ2 (PW only, Vol. .' MIN.)
ICC (GVN 1 Im = 0)
QUIESCENT SUPPLY CURRENT
SUPPLY CURRENT
0 1.5 2.0 2.5 3.0 3.5 4.0
SUPPLY VOLTAGE VCC (V)
PRE Gvo, Gvc - f
,m Vo = -10dBV
:Sir2?.
'li', 40
ts'-' 20
10 100 1k 10k 100k
FREQUENCY f (Hz)
PRE Vom - VCC
% 1000
's 200
0 1.5 2.0 2.5 3.0 35 4.0
SUPPLY VOLTAGE VCC (v)
OUTPUT DC VOLTAGE Vo(Dc) (V)
CROSS TALK CT
TOTAL HARMONIC DISTORTION THD
vo (DC) - VCC
VREF, PW OUT, PRE OUT
0 1.5 2.0 2.5 3.0 3.5 4.0
SUPPLY VOLTAGE VCC (V)
PRE CT - f
Vo = -10dBV
10 100 1k 10k 100k
FREQUENCY f (Hz)
PRE THD - Vo
f= 10kHz
f=100Hz
10 100 1000 10000
OUTPUT VOLTAGE Vo (mVrms)
1999-10-22 10/15
TOSHIBA
PRE Vni - Vcc
(I’Vrms)
EQUIVALENT INPUT NOISE VOLTAGE
0 di 2.0 2.5 3.0 3.5 4.0
SUPPLY VOLTAGE Vcc (V)
PW GV-f
- BST = OFF
20 100 1k 10k 100k
FREQUENCY f (Hz)
PW Po - Vcc
THD = 10%
0 1.5 2.0 2.5 3.0 3.5 4.0
SUPPLY VOLTAGE VCC (v)
CROSS TALK CT (dB) R1PPLE REJECTION RATIO RR (dB)
TOTAL HARMONIC DISTORTION THD ("/u)
TA2145F
PRE RR - Vcc
f, = 100 Hz
20 Vr= -20dBV
800 1.5 2.0 2.5 3.0 3.5 4.0
SUPPLY VOLTAGE Vcc (V)
PW CT - f
Vo = -10dBV
BST = OFF
20 100 1k 10k 100k
FREQUENCY f (Hz)
PW THD - Po
-0.2 1 10 100
OUTPUT POWER PO (mW)
1999-10-22 11/15
TOSHIBA TA2145F
PW Vo - Vol. PW Vno - Vol.
10 500
VOLUME = Resistance-Na-GND) E VOLUME Resistance (mNC(9 - GND)
RATIO _ > RATIO = -
A -10 Volume Resistance 3 Volume Resistance
:'s5 dB = -10dBV o 200
t', E 100
g 50 m 50
o -70 g 20
-90 10
0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1
VOLUME RATIO VOLUME RATIO
PW RR - Vol. GVN AVREF, AK - Vcc
Resistance (PIN© - GND)
VOLUME RATIO = -
Volume Resistance ti
f, =100Hz,vr = -20dBV
RIPPLE REJECTION RATIO RR (dB)
REFERENCE VOLTAGE FLUCTUATION AVREF (mV)
CURRENT RATIO FLUCTUATION
o 0.2 0.4 0.6 0.8 1 1.5 2.0 2.5 3.0 3.5 4.0
VOLUME RATIO SUPPLY VOLTAGE Vcc (V)
GVN AVREF, AK - Im 16 Icco, ICC - Ta
ICCQ1 (PRE + PW, Vol. = MIN.)
QUIESCENT SUPPLY CURRENT
REFERENCE VOLTAGE FLUCTUATION AVREF (mV)
E 5 ICCQZ (PW only, Vol. = MIN.)
2 g l l 1
Q U ICC (GVN : lm = 0)
tt2 'k
8 o 50 100 150 200 250 300 -20 0 20 40 60 80
MOTOR CURRENT um (mA) AMBIENT TEMPERATURE Ta (°C)
1999-10-22 12/15
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08 09 017 02 0
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VEIHSOJ.
TOSHIBA TA2145F
APPLICATION CIRCUIT
T; t t
32 e' 4700
mm 8200 pF WF LPRE
-MN-4F-s-4 LL OFF
PRE INB 18kQ g I
M , S +
470 k0
PRE INA l?..Y Ct..2) 1?...y 1?..Y 49 Q9 (i?,
INB NFB PRE PW RF IN PRE PW GVN Rt GVN GVN
OUTB INB SW VCC VCC CTL OUT
T A 2 1 4 5 F
PRE PRE PW PW PW GVN
GND INA NFA OUTA INA VCTL OUTB OUTA OUTc INC GND GND
1 Cih, Ci.) Gh, (ir) re Ci) (ip, (i) (ii) (i?, 12
L 470 kSZI f r I h;"
n - Q 1psF E E oo
47 k 1 k UT
'sos?. JW-lo--'; gl J,' 0.1 #F A
22 pF 470 Q 8200 pF E u, - RL
+ - “A o
a " '" 31. 2f O OUTC
VREF ' o art I RL l
BST SW BST: OFF
1999-10-22 14/15
TOSHIBA TA2145F
PACKAGE DIMENSIONS
SSOP24-P-300-1.00 Unit 2 mm
24 13_____
"lqlriglqrilqlqplrllp " " r
N to. ti"
+1 Fl o
C) 3 , =3,
iHjl'tllilldl::lldldldldl:lld..., -
1.0TYP 0.4 0.1 :4tTt)VtjiiCl
, 13.5MAX '
.- 13.0m2 "
[ P" m
“E " '9
( 3 .i..x.'_..l,,".ris.iii If,?
u? cu ‘F. I
-"-tr, CM CD
""-''"'"""'h" ,
Ti' 0.525103
Weight : 0.329 (Typ.)
1999-10-22 15/15
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