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TA2145AFG
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA2145AFG
3 V Stereo Headphone Amplifier (3 V USE)
The TA2145AFG 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: Vni = 1.2 Vrms (typ.) Preamplifier on/off switch. * Built-in power amplifier OCL (Output condenser-less) Voltage gain: GV = 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 (VCC = 3 V, f = 1 kHz, PRE OUT = 100 mVrms, Ta = 25C, typ.) * Quiescent supply current PRE + PW: ICCQ = 8.5 mA GVN: ICC = 2.5 mA * 0.1 mW x 2 ch output ICC1 = 9.8 mA (RL = 32 ) ICC2 = 10.5 mA (RL = 16 ) * 0.5 mW x 2 ch output ICC3 = 14.0 mA (RL = 32 ) ICC4 = 16.5 mA (RL = 16 ) * Operating supply voltage range (Ta = 25C) VCC (opr) = 1.8~3.6 V GVN VCC (opr) = 2.1~3.6 V (Motor voltage = 1.8 V) Weight: 0.32 g (typ.)
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TA2145AFG
Block Diagram
M PRE: OFF PRE OUTB PW INB RF IN PRE SW GVN VCC GVN CTL GVN OUT 13
24
VREF
23
INB
22
NFB
21
20
19
18
17
VCC
16
15
Rt
14
RIPPLE FILTER
PREB
PRE SW
VOL. VREF
VOL.
PW B
PREA
PW A
PW C
VOL. CONTROL 4 5 6 7 8 9 10 OUTC PW INC 11 12
1
PRE GND
2
INA
3
NFA
PRE OUTA
PW INA
VCTL
OUTB
OUTA
PW GND
GVN GND OUTA
RL BST SW BST: OFF OUTC RL OUTB
VREF
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TA2145AFG
Terminal Explanation (Terminal Voltage: Typical terminal voltage at no signal with test
circuit, VCC = 3 V, Ta = 25C)
Terminal No. 1 Name PRE GND The GND, except for power drive stage and motor governer stage. Terminal Voltage (v) 0
Function
Internal Circuit
2
INA Input of preamplifier 3 500
RF 1.2
23
INB 2 500
3
NFA NF of preamplifier VREF 1.2
22 4 21 7 8 9
NFB PRE OUTA Output of preamplifier PRE OUTB OUTB OUTA OUTC Output of power amplifier 4 1.2 VCC
5 5 PW INA 10 k RF
Input of power amplifier
VREF
1.2
20
PW INB
VCC
6
VCTL
The terminal of DC volume control
VREF 6
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TA2145AFG
Terminal No. Name Function Internal Circuit Terminal Voltage (v)
20 k 10
VREF
10
PW INC
Input of center amplifier
1.2
30 k 2 k VREF
11 12
PW GND GVN GND
GND for power drive stage GND for motor governor stage

0 0
M 13 GVN OUT Motor terminal
16 14 GVN CTL The terminal of motor speed control
15
14
13
15
Rt
The terminal of amateur compensation resistor
16
GVN VCC
VCC for motor governor stage
3
17
VCC
VCC for preamplifier stage and power amplifier stage.
3
18 Muting switch of preamplifier 18 PRE SW Preamp. on: "L" level/open Preamp. off: "H" level Refer to application note
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TA2145AFG
Terminal No. Name Function Internal Circuit Terminal Voltage (v)
19
RF IN
Ripple filter of power supply
19 4 k
24 VCC
2.5
Reference voltage 24 VREF Preamplifier and power amplifier operate on this reference.
1.3 k 4.7 k
1.2 10 k
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TA2145AFG
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 VCC (pin 17) ---------------- Preamplifier stage and power amplifier stage. GVN VCC (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. * * * VREF It is necessary to stabilize the VREF 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 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 1.8 V. In case that it is more than 1.8 V, the low voltage performance becomes bad. * PRE SW sensitivity (Ta = 25C)
PRE SW
4
(V)
3.6 V 3 "H" PRE AMP: OFF 3.0 V
Terminal DC voltage
V18
2
1.8 V 1.5 V 1.2 V
1 0.5 V
0
1.5
2.0
2.5
3.0
3.5
4.0
Supply voltage
VCC
(V)
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TA2145AFG
Absolute Maximum Ratings (Ta = 25C)
Characteristic Supply voltage Power dissipation Output current (PW AMP.) Output current (GVN) Operating temperature Storage temperature PD Symbol VCC (Note 1) (Note 2) IO (PW) IO (GVN) Topr Tstg Rating 4 400 925 200 700 -25~75 -55~150 mA mA C C Unit V mW
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
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TA2145AFG
Electrical Characteristics
(Unless otherwise specified, VCC = 3 V, Ta = 25C, f = 1 kHz, SW2: a, SW5: OPEN Preamplifier: Rg = 2.2 k, RL = 10 k, SW1: ON, SW3: b, SW4: b Power amplifier: Rg = 600 , RL = 16 , Vol.: max, SW1: OPEN, SW3: a, SW4: a Motor governor: Im = 100 mA, SW1: OPEN, SW3: b, SW4: b)
Characteristic Symbol ICCQ1 ICCQ2 Open loop voltage gain Closed loop voltage gain Maximum output voltage Total harmonic distortion Pre amp. Equivalent input noise voltage Cross talk Ripple rejection ratio Preamplifier muting attenuation Preamplifier on voltage Preamplifier off voltage Voltage gain Channel balance Output power 1 Power amp. Output power 2 Total harmonic distortion Output noise voltage Ripple rejection ratio Cross talk Dc volume maximum attenuation Supply current Saturation voltage Reference voltage Reference voltage fluctuation 1 Reference voltage fluctuation 2 Reference voltage fluctuation 3 Current ratio Current ratio fluctuation 1 Current ratio fluctuation 2 Current ratio fluctuation 3 GVO GVC Vom THD1 Vni CT1 RR1 ATT1 V18 (ON) V18 (OFF) GV CB Po1 Po2 THD2 Vno RR2 CT2 ATT2 ICC VCE (sat) Test circuit VCC = 2.1~3.6 V Im = 25~250 mA Ta = -25~75C Test condition Pre off, Vin = 0, Vol.: min, SW4: b, SW5: ON Vin = 0, Vol.: min, SW4: b Vo = -10dBV, SW2: b Vo = -10dBV THD = 1% Vo = -10dBV Rg = 2.2 k, SW1: OPEN BPF = 20 Hz~20 kHz, NAB (GV = 35dB, f = 1 kHz) Vo = -10dBV fr = 100 Hz, Vr = -20dBV Vo = -10dBV, SW5: OPEN ON VCC = 1.8 V Vo = -10dBV Vo = -10dBV RL = 16 , THD = 10% RL = 32 , THD = 10% Po = 1m W Rg = 600 , SW3: b BPF = 20 Hz~20 kHz fr = 100 Hz, Vr = -20dBV Vo = -10dBV Vo = -10dBV, SW4: ab (Vol.: max min) Im = 0 Im = 200 mA Im = 100 mA VCC = 2.1~3.6 V Im = 25~250 mA Ta = -25~75C Min 550 0 1.5 29 -1.5 17 0.76 34.5 Typ. 7.5 8.5 86 35 720 0.02 1.2 70 48 80 31 0 28 20 0.5 270 52 32 82 2.5 0.81 0.25 0.003 0.005 37.5 0.25 0.08 0.005 Max 13 14.5 0.3 2.4 0.5 1.8 33 +1.5 400 3.5 0.5 0.86 40.5 %/V %/mA %/C dB dB mVrms % Vrms dB dB dB V V dB dB mW mW % Vrms dB dB dB mA V V %/V %/mA %/C Unit
Quiescent supply current
mA
VREF VREF1 VREF2 VREF3
K
Motor governor
K1 K2 K3
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TA2145AFG
Test Circuit
Rg = 600 (a) SW3b (b) 600 VREF 47 F 47 F 100 F SW5 180 5
VREF PRE OUTB SW2b 220 F (b) (a) 18 k 22 F 8200 pF 1000 pF 1000 pF 2.2 k 470 470 k 1 F
Rg = 600 Rg = 600
PRE INB SW1b
10 k 1 F
PW INB
VCC
1 F 3.6 k 5 k 18 PRE SW 17 PW VCC 16 GVN VCC 15 Rt 14 GVN CTL 13 GVN OUT
2.2 k
22 F
24 VREF
23 INB
470 k 22 21 NFB PRE OUTB
20 PW INB
19 RF IN
PRE SW1a INA
TA2145AFG
PRE GND 1
INA 2
NFA 3
PRE OUTA 4
PW INA 5
VCTL 6
OUTB OUTA OUTC 7 8 9
PW INC 10
PW GND 11
GVN GND 12
470 k 470 k PW OUTA 22 F 470 8200 pF 220 F (b) (a) 18 k SW2a 1 F SW4 (a) (b) 10 k RL PW OUTC RL PW OUTB 1 F
10 k
PRE OUTA
(a) Rg = 600 SW3a 600 PW IN
A
VREF
(b) VREF
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TA2145AFG
Characteristic Curves (Unless otherwise specified, VCC = 3 V, Ta = 25C, f = 1 kHz,
Preamplifier: Rg = 2.2 k, RL = 10 k Power amplifier: Rg = 600 , RL = 16 , Vol. = max Motor governor: Im = 100 mA)
VO (DC) - VCC
2.5
ICCQ, ICC - VCC
16
Quiescent supply current ICCQ (mA) (mA) Supply current ICC
(V) VO (DC) Output DC voltage
12 ICCQ1 (PRE + PW, Vol.: min) 8 ICCQ2 (PW only, Vol.: min)
2.0
1.5 VREF, PW OUT, PRE OUT 1.0
4
ICC (GVN: Im = 0)
0.5
0 0
1.5
2.0
2.5
3.0
3.5
4.0
0 0
1.5
2.0
2.5
3.0
3.5
4.0
Supply voltage
VCC (V)
Supply voltage
VCC (V)
PRE
100
GVO, GVC - f
Vo = -10dBV 40
PRE
CT - f
Vo = -10dBV
(dB) (dB)
80
Open loop voltage GVO Closed loop voltage GVC
60
CT (dB) Cross talk
10 k 100 k
GVO
50
60
40
20
GVC
70
0 10
100
1k
80 10
100
1k
10 k
100 k
Frequency
f (Hz)
Frequency
f (Hz)
PRE
1000
Vom - VCC
(%)
10
PRE
THD - Vo
(mVrms)
THD = 1%
THD Total harmonic distortion
3
Vom
500
Maximum output voltage
1 f = 10 kHz 3 0.1 f = 100 Hz
200
0.03 0.01 1
f = 1 kHz
100 0
1.5
2.0
2.5
3.0
3.5
4.0
10
100
1000
10000
Supply voltage
VCC (V)
Output voltage
Vo
(mVrms)
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TA2145AFG
PRE
20
Vni - VCC
10
PRE
fr = 100 Hz
RR - VCC
(Vrms)
10
(dB)
20 30
Vr = -20dBV
Vni
5
Ripple rejection ratio
RR
2 1 0.5 0
Equivalent input noise
40 50 60
70 80 0
1.5
2.0
2.5
3.0
3.5
4.0
1.5
2.0
2.5
3.0
3.5
4.0
Supply voltage
VCC (V)
Supply voltage
VCC (V)
PW
60 Vo = -10dBV
GV - f
PW
CT - f
Vo = -10dBV
0
GV (dB)
CT (dB)
50
10 BST = ON 20 30 40 BST = OFF
Voltage
BST = ON BST = OFF
30 50 20 20 60 20
100
1k
10 k
100 k
Cross talk
40
100
1k
10 k
100 k
Frequency
f (Hz)
Frequency
f (Hz)
PW
100 THD = 10%
Po - VCC
30
PW
VCC = 3 V RL = 16 10
THD - Po
(mW)
Total harmonic distortion
Po
RL = 16 32 10
THD
(%)
3
Output power
f = 10 kHz 1 100 Hz 1 kHz 0.2 0.2
2 0
1.5
2.0
2.5
3.0
3.5
4.0
1
10
100
Supply voltage
VCC (V)
Output power Po (mW)
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TA2145AFG
PW
10 Volume Ratio -10 0dB = -10dBV -30
Vo - Vol.
500 Volume resistance
PW
Volume 300 Ratio
Vno - Vol.
=
Resistance (Pin@-GND) Volume resistance
Vo
Vno (Vrms) Output noise voltage
0.8 1
=
Resistance (Pin@-GND)
(mW)
100
Output voltage
-50
50 30
-70
-90 0
0.2
0.4
0.6
10 0
0.2
0.4
0.6
0.8
1
Volume ratio
Volume ratio
RR - Vol.
Volume ratio =
Resistance (Pin@-GND) Volume resistance
GVN
(mV)
7.5
VREF, K - VCC
40
(dB)
50 0dB = -10dBV, Vr = -20dBV
Reference voltage fluctuation VREF Current ratio fluctuation K
5.0
RR
2.5
VREF
Ripple rejection ratio
60
0.0
K
-2.5
70
-5.0
80 0
0.2
0.4
0.6
0.8
1
-7.5 1.5
2.0
2.5
3.0
3.5
4.0
Volume ratio
Supply voltage
VCC (V)
GVN
(mV)
10
VREF, K - Im
16
ICCQ, ICC - Ta
VREF K
5
(mA) (mA) ICCQ ICC
12
Reference voltage fluctuation current ratio fluctuation
VREF 0 K
ICCQ1 (PRE + PW, Vol. = min) 8 ICCQ2 (PW only, Vol. = min)
-5
Quiescent Supply current Supply current
4
ICC (GVN: Im = 0)
-10 0
0 -20 0 20 40 60 80
50
100
150
200
250
300
Motor current Im
(mA)
Ambient temperature
Ta
(C)
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TA2145AFG
VO (DC) - Ta
1.5 40
PRE
GV: Vo = -10dBV Vom: THD = 1%
GV, Vom - Ta
800
(V)
38 VREF, PW OUT, PRE OUT 1
760
(dB)
VO (DC)
GV
GV 34 680
0.5
32
640
0
-20
30 0 20 40 60 80
-20
0
20
40
60
600 80
Ambient temperature
Ta
(C)
Ambient temperature
Ta
(C)
PRE
1 Vo = -10dBV
THD - Ta
35
PW
GV: Vo = -10dBV Po: THD = 10%
GV, Po - Ta
50
(%)
40 0.1
GV (dB)
Total harmonic distortion
0.01
Po 20
0.001
-20
25 0 20 40 60 80
-20
0
20
40
60
10 80
Ambient temperature
Ta
(C)
Ambient temperature
Ta
(C)
PW
10 Po = 1 mW
THD - Ta
(mV)
6
GVN
VREF, K - Ta
(%)
5
Reference voltage fluctuation VREF K Current ratio fluctuation
4
THD
2
2 K 0 VREF -2
Total harmonic distortion
1
0.5
0.2
-4
0.1
-20
-6
0
20
40
60
80
-20
0
20
40
60
80
Ambient temperature
Ta
(C)
Ambient temperature
Ta
(C)
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Output Power
30
30
Voltage
Po
GV
(mW)
THD
Maximum output voltage
36
Vom
720
Output voltage
Voltage gain
Vom
(mVrms)
TA2145AFG
Application Circuit
VCC 0.1 F 47 F
22 F PRE INB 1000 pF 1000 pF
470 8200 pF 1 F 18 k 100 F PRE OFF
470 k
M 180 1 F 3.6 k 5 k
PRE INA
22 F
470 k 24 VREF 23 INB 22 NFB 21 PRE OUTB 20 PW INB 19 RF IN 18 PRE SW 17 PW VCC 16 GVN VCC 15 Rt
14 GVN CTL
13 GVN OUT
TA2145AFG
PRE GND 1
INA 2
NFA
PRE OUTA 3 4 470 k
PW INA 5 1 F 10 k
VCTL 6 33 k
OUTB 7 0.1 F 33 k
OUTA 8
OUTC 9
PW INC 10
PW GND 11
GVN GND 12 OUTA RL OUTC RL OUTB
470 k 18 k 22 F 470 VREF
12 k 0.1 F
0.1 F
8200 pF
BST SW BST: OFF
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TA2145AFG
Package Dimensions
Weight: 0.32 g (typ.)
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TA2145AFG
RESTRICTIONS ON PRODUCT USE
* The information contained herein is subject to change without notice. 021023_D
060116EBA
* 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. 021023_A * 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. 021023_B * The products described in this document shall not be used or embedded to any downstream products of which manufacture, use and/or sale are prohibited under any applicable laws and regulations. 060106_Q * The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by TOSHIBA for any infringements of patents or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of TOSHIBA or others. 021023_C * The products described in this document are subject to the foreign exchange and foreign trade laws. 021023_E
About solderability, following conditions were confirmed * Solderability (1) Use of Sn-37Pb solder Bath * solder bath temperature = 230C * dipping time = 5 seconds * the number of times = once * use of R-type flux (2) Use of Sn-3.0Ag-0.5Cu solder Bath * solder bath temperature = 245C * dipping time = 5 seconds * the number of times = once * use of R-type flux
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