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TA2131FNG
TOSHIBA Bipolar Linear IC Silicon Monolithic
TA2131FNG
Low Current Consumption Headphone Amplifier for Portable MD Player (With Bass Boost Function)
The TA2131FNG is a low current consumption headphone amplifier developed for portable digital audio. It is particularly well suited to portable MD players that are driven by a single dry cell. It also features a built-in bass boost function with AGC, and is capable of bass amplification of DAC output and analog signals such as tuner.
Features
* * * * * * * * * Low current consumption: ICCQ (VCC1) = 0.55 mA (typ.) ICCQ (VCC2) = 0.20 mA (typ.) Output power: Po = 8 mW (typ.) (VCC1 = 2.8 V, VCC2 = 1.2 V, f = 1 kHz, THD = 10%, RL = 16 ) Low noise: Vno = -102dBV (typ.) Built-in low-pass boost (with AGC) I/O pin for beep sound Outstanding ripple rejection ratio Built-in power mute Built-in power ON/OFF switch Operating supply voltage range (Ta = 25C): VCC1 = 1.8~4.5 V VCC2 = 0.9~4.5 V Weight: 0.14 g (typ.)
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TA2131FNG
Block Diagram
BEEP OFF ON BST NF1 BST BEEP Vref GND IN IN SW 21 20 19 18 Vref VCC1 VCC1 DAC OUT (2.8 V)
Vref
Vref
OFF ON OFF ON
LPF1 24 23
Vref 22
MT SW 17
PW SW 16 PW SW
MT TC
VCC1 15 14
INB 13
Vref
BEEP BOOST MUTE SW SW
BST1
BST2
BST AGC
PW B
PW A
LPF2
1
BST NF2
2
BST OUT
3
AGC IN
4
DET
5
OUTB
6
PWR GND
7
OUTA
8
VCC2
9
BEEP OUTA
10
BEEP OUTB
11
INA
12 Vref
RL Vref Vref
RL +B (1.2 V) DAC OUT
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TA2131FNG
Terminal Explanation (Terminal voltage: Typical terminal voltage at no signal with test
circuit, VCC1 = 2.8 V, VCC2 = 1.2 V, Ta = 25C)
Terminal No. Terminal Explanation Internal Circuit Terminal Voltage (V)
12
ADD 20 k
20 k
1
LPF2
BST amplifier 1 output (filter terminal)
PWA
AGC
BST1
0.61 BST2 AMP
23
20 k
10 k
12 k
23
LPF1
ADD amplifier output (filter terminal)
13 PWB 2 k 30 k
0.61
24 24 BST NF1 BST amplifier 1 NF Vref BST amplifier 2 NF terminal (low-pass compensation condenser connection terminal)
1 0.61 Vref
20 k
2
BST NF2
12 20 k ADD
PWA 0.61 8
20 k
3
BST OUT
BST amplifier 2 output terminal
6
OUTB Power amplifier output
10 k 10 k
BST1 OUT
BST2
10 k
15 k
10 k 3 0.61 20 k 10 k 10 k 10 k 6 20 k 15 k
8
OUTA
12
INA Power amplifier input 13
0.61 PWB
13
INB
2
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TA2131FNG
Terminal No. Terminal Explanation Internal Circuit Terminal Voltage (V)
14 Signal input level to BST amplifier is varied according to the input level to the boost AGC input terminal. Input impedance: 15 k (typ.)
4
AGC IN
5 k
Vref 0.61
4 10 k
14
5
DET
Smoothing of boost AGC level detection
5.1 k
5
7
PWR GND
GND of power amplifier output stage VCC (+B) at power amplifier output stage
0
9
VCC2
1.2
10
BEEP OUTA Beep sound output terminal 14 10 k 10 11 0
11
BEEP OUTB 19 Beep sound input terminal Receives beep sound signals from microcomputer. Main VCC
19
BEEP IN
14
VCC1
2.8
14 Mute smoothing Power mute switch Reduces the shock noise during switching
15
MT TC
12 k
1.2
15
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TA2131FNG
Terminal No. Terminal Explanation Internal Circuit Terminal Voltage (V)
VCC1 14 Power ON/OFF switch "H" level: IC operation "L" level: IC OFF Refer to function explanation 5 47 k 16
16
PW SW
VCC1 14 17 MT SW Mute switch "L" level: mute reset "H" level: mute ON Refer to function explanation 5 17 47 k
18
BST SW
Bass boost ON/OFF switch "H" level/OPEN: BST ON "L" level: BST OFF Refer to function explanation 5
14
20 k 18
20
GND
GND of input stage in power amplifier
0
14 21 Vref IN Reference voltage circuit filter terminal 4 k 0.61
10 k
22
Vref
Reference voltage circuit
21
10 k
22 0.61
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TA2131FNG
Function Explanation
1. Bass Boost Function
1-1 Description of Operation
TA2131FNG has a bass boost function for bass sound reproduction built-in to the power amplifier. With the bass boost function, at medium levels and lower, channel A and channel B are added for the low frequency component, and output to BST amplifier 2 (BST2) in negative phase. That signal is inverted and added before being subjected to bass boost. If the signal of the low-frequency component reaches a high level, the boost gain is controlled to main a low distortion (see Fig.1).
20 k INA 20 k 22 10 F DAC OUT 10 F Vref 20 k ADD 10 k 20 k 12 k BST1 BST2 2 k 30 k 10 k 20 k 10 k PWB 10 k 15 k 10 k 15 k 10 k PWA 10 k OUTA 2
V (OUT) 220 F
V (RL) 16
RL BST NF2 8 1 F Vref V (NF2) 4 220 F 16 RL
20 k
BST AGC 10 k
5 k
LPF1 0.1 F V (LPF1)
11 0.1 F
DET 5
AGC IN BST NF1 6 10 4.7 F 0.1 F V (NF1)
9
LPF2 V (LPF2)
BST OUT 7 0.1 F 22 k V (BST OUT)
Vref
Vref
Vref
Figure 1 System Diagram of Bass Boost
1-2
AGC Circuit
The AGC circuit of the bass boost function detects with "AGC DET" the voltage component created by "BST2," and as the input level increases, the variable impedance circuit is changed, and the bass boost signal is controlled so that it is not assigned to BST amplifier 1. In this way, the bass signal to "BST2" input is shut-off, and that boost gain is controlled.
1-3
Bass Boost System
As shown in Fig.1, the flow of the bass boost signal is that the signal received from power amplifier input goes through LPF1, ADD amplifier, ATT (variable impedance circuit), BPF1 (BST amplifier 1) and LPF2, and the negative phase signal to the power amplifier input signal is output from BST amplifier 2. The reason why it becomes the negative phase of the BST amplifier 2 signal is that the phase is inverted by 180 in the audible bandwidth by the secondary characteristics of LPF1 and LPF2 in Fig.1. Ultimately the main signal and the bass boost signal formed before BST2 are added. Fig.2 shows the frequency characteristics to each terminal.
10 k OUTB
INB 21
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40 V (OUT) 20 V (RL) V (NF2) 0 V (LPF2)
(dB)
V (BST OUT)
GV
-20
V (NF1)
-40
V (LPF1)
-60 1
10
100
1k
10 k
100 k
f
(Hz)
Figure 2 During Bass Boost (Frequency Characteristics to Each Terminal)
2. Low-Pass Compensation
2-1. Function
In C-couple type power amplifiers, it is necessary to give the output condenser C a large capacity to flatten out the frequency characteristics to the low frequency band (this is because the loss in the low frequency bandwidth becomes larger due to the effect of the high-pass filter comprising C and RL). Particularly when the headphone load is approximately 16 and an attempt is being made to achieve frequency characteristics of 3 dB at 20 Hz, a large capacity condenser of C = 470 F is required. Bearing this situation in mind, a low-pass compensation function was built in to the TA2131FNG, and while reducing the capacity of the output coupling condenser, almost flat (3 dB) frequency characteristics in all audible bandwidths (20 Hz to 20 kHz) have been achieved. Fig.3 shows the low-pass system diagram, and Fig.4 shows the frequency characteristics at each point. In Fig.4, (a) represents the status lost by the low-pass as a result of the high-pass filter comprising the headphone load (RL = 16 ) and the output coupling condenser (220 F) in the C-coupling system.
20 k 20 k INA 12 10 F DAC OUT 10 F 13 INB 20 k 10 k PWB Vref 20 k BST2 10 k 10 k 15 k 10 k 15 k OUTA 10 k ADD PWA 10 k 8
V (OUT) V (RL) 220 F 16 RL BST NF2 2 1 F Vref 220 F 16 RL
10 k 6 OUTB
20 k
Figure 3 Low-Pass Compensation System Diagram
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20 (b)
10
(dB)
(c) 0 (a)
GV
-10 -20 1
10
100
1k
10 k
100 k
f
(Hz)
Figure 4 Power Amplifier Frequency Characteristics
The low-pass component alone is extracted from the composite signal of PWA/PWB output, and that frequency signal is fed back to PWA/PWB once more via the inversion amplifier, thereby making it possible to increase the gain only of the low-pass component. The frequency characteristics of the power amplifier output V (OUT) in this state are shown in Fig.4 (b). In practice they are the frequency characteristics (c) viewed from load terminal V (RL), and the low-pass is compensated relative to the state in (a).
2-2.
Low-Pass Compensation Condenser and Crosstalk
In this low-pass compensation condenser circuit, processing is carried out using the composite signal of power amplifier output, so this affects crosstalk, according to the amount of compensation. f characteristics and crosstalk generated by the capacity of the condenser for compensation (2-pin) are shown below.
10 VCC1 = 2.8 V VCC2 = 1.2 V Rg = 620 RL = 16 C = 0.47 F Filter: LPF 80 kHz Output C = 220 F 0 Vref short C = 1 F C = 2.2 F
Response (dB)
-10 10
30
100
300
1k
3k
10 k
30 k
f
(Hz)
Figure 5 Condenser and f Characteristics for Low-Pass Compensation
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TA2131FNG
CT - f
VCC1 = 2.8 V VCC2 = 1.2 V Rg = 620 RL = 16 Vo = -22dBV WIDE BAND Output C = 220 F C = 1 F
0
C = 0.47 F
CT (dB)
-20 C = 2.2 F
-40 Vref short
-60 10
30
100
300
1k
3k
10 k
30 k 100 k
f (Hz)
Figure 6 Low-Pass Compensation Condenser and Crosstalk
3.
Beep
Beep sound signals from microcomputer can be received by the beep input terminal (19-pin). The PWA and PWB of the power amplifier during power mute are turned OFF, and the beep signal input from BEEP-IN (19-pin) is output from the BEEP-OUT terminal (10/11-pin) as fixed current, after passing through the converter and current amplification stage. Connecting this terminal to the headphone load outputs the beep sound. If the beep sound is not input, fix the BEEP-IN (19-pin) terminal to GND level.
VCC PW SW (18-pin) OFF MT SW (17-pin) OFF BEEP IN (15-pin) 200 ms 20 IBEEP 15 IBEEP ID 23 24 100 ms 100 ms ON OFF
ON
OFF
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TA2131FNG
4. Power Switch
As long as the power switch is not connected to "H" level, the IC does not operate. If it malfunctions due to external noise, however, it is recommended to connect a pull-down resistor externally (the power switch is set to be highly sensitive).
5.
Threshold Voltages of Switches
(1)
5 4.5 V
PW SW
5
(2)
4.5 V
MT SW, BST SW
(V)
H
(V)
4
4
V17, V18
V16
3
3 H 2
Terminal voltage
2 1.6 V 1 0.6 V L 0 1 2 3 4 5
Terminal voltage
1 0.8 V 0.3 V 0 1 2 L 3 4 5
Power supply voltage
VCC (V)
Power supply voltage
VCC (V)
PW SW (V16) "H" level "L" level IC operation IC OFF "H" level "L" level
MT SW (V17) Mute ON Mute reset
BST SW (V18) "H" level/OPEN "L" level BST ON BST OFF
6.
These capacitors which prevent oscillation of the power amplifier, and are between the Vref and VCC-GND must have a small temperature coefficient and outstanding frequency characteristics.
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TA2131FNG
Absolute Maximum Ratings
Characteristic Supply voltage Output current Power dissipation Operating temperature Storage temperature Symbol VCC Io (peak) PD (Note) Topr Tstg Rating 4.5 100 500 -25~75 -55~150 Unit V mA mW C C
Note: Derated above Ta = 25C in the proportion of 4 mW/C.
Electrical Characteristics (Unless specified otherwise, VCC1 = 2.8 V, VCC2 = 1.2 V,
Rg = 600 , RL = 16 , f = 1 kHz, Ta = 25C)
Characteristic Symbol ICC1 ICC2 Quiescent supply current ICC3 ICC4 ICC5 ICC6 Power supply current during drive Gain Channel balance Output power Total harmonic distortion Power Section Output noise voltage Crosstalk ICC7 ICC8 GV CB Pomax THD Vno CT RR1 Ripple rejection ratio RR2 Mute attenuation Beep sound output voltage ATT VBEEP BST1 Boost gain BST2 BST3 Test condition IC OFF (VCC1), SW1: b, SW2: b IC OFF (VCC2), SW1: b, SW2: b MUTE ON (VCC1), SW1: a, SW2: b MUTE ON (VCC2), SW1: a, SW2: b No signal (VCC1), SW1: a, SW2: a No signal (VCC2), SW1: a, SW2: a Po = 0.5 mW + 0.5 mW output (VCC1) Po = 0.5 mW + 0.5 mW output (VCC2) Vo = -22dBV Vo = -22dBV THD = 10% Po = 1 mW Rg = 600 , Filter: IHF-A, SW4: b Vo = -22dBV fr = 100 Hz, Vr = -20dBV inflow to VCC2 fr = 100 Hz, Vr = -20dBV inflow to VCC1 Vo = -12dBV, SW2: a b V Beep IN = 2 Vp-o, SW2: b Vo = -20dBV, f = 100 Hz, SW3: ON OPEN Vo = -30dBV, f = 100 Hz, SW3: ON OPEN Vo = -50dBV, f = 100 Hz, SW3: ON OPEN Min 10 -1.5 5 -42 -71 -54 -90 -53 1 10 13.5 Typ. 0.1 0.1 0.35 5 0.55 0.20 0.6 5.3 12 0 8 0.1 -102 -48 -77 -64 -100 -48 4 13 16.5 Max 5 5 0.50 10 0.75 0.40 14 dB 1.5 0.3 -96 dB -43 7 16 19.5 dB dBV mW % dBV mA mA A Unit A
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TA2131FNG
Test Circuit
Vref Rg = 600 Vref Vref 10 F VCC1 (a) 4.7 F 0.1 F 4.7 F OFF ON 23 LPF1 22 Vref 21 Vref IN 20 GND 19 BEEP IN 18 BST SW 17 16 15 14 VCC1 (b) SW2 VCC1 (b) (a) SW1 1 F (a) SW4B (2.8 V) 600 (b) 10 F 600 +B (1.2 V) Vref 10 F SW4A (a) 16 (b) 13 INB INA 12
SW3
24 BST NF1
MT SW PW SW MT TC
TA2131FNG
LPF2 1 0.1 F
BST NF2 2
BST OUT 3
AGC IN 4
DET 5
OUTB 6 220 F
PWR GND 7
OUTA 8 220 F
VCC2 9
BEEP OUTA 10
BEEP OUTB 11
0.1 F
22 k 0.1 F
(*)
(*) 16
Vref
Vref
(*) 0.22 F + 10 Monolithic ceramic capacitor
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TA2131FNG
Application Circuit 1
DAC OUT (2.8 V) 10 F Vref 24 BST NF1 23 LPF1 22 Vref 21 Vref IN 20 GND 19 BEEP IN 18 BST SW 17 16 15 14 VCC1 13 INB BEEP OUTB 11 INA 12 Vref 220 F 0.1 F (*) (*) 220 F 0.1 F 0.1 F 1 F 22 k DAC OUT
Vref
Vref
BEEP 100 k
VCC1 OFF 0.1 F
VCC1
ON OFF 1 F BEEP OUTA 10 ON
0.1 F
10 F
4.7 F
4.7 F
MT SW PW SW MT TC
TA2131FNG
LPF2 1
BST NF2 2
BST OUT 3
AGC IN 4
DET 5
OUTB 6
PWR GND 7
OUTA 8
VCC2 9
RL Vref Vref
RL +B (1.2 V)
(*) 0.22 F + 10 Monolithic ceramic capacitor
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10 F
TA2131FNG
Application Circuit 2 (Low-Pass Compensation/Bass Boost Function/Beep Not Used)
VCC1 OFF 10 F 4.7 F VCC1 DAC OUT (2.8 V) 10 F Vref 24 BST NF1 23 LPF1 22 Vref 21 Vref IN 20 GND 19 BEEP IN 18 BST SW 17 16 15 14 VCC1 13 INB BEEP OUTB 11 INA 12 Vref 220 F (*) (*) 220 F DAC OUT
Vref
ON OFF 1 F BEEP OUTA 10 ON
MT SW PW SW MT TC
TA2131FNG
LPF2 1
BST NF2 2
BST OUT 3
AGC IN 4
DET 5
OUTB 6
PWR GND 7
OUTA 8
VCC2 9
RL Vref Vref Vref
RL +B (1.2 V)
(*) 0.22 F + 10 Monolithic ceramic capacitor
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10 F
TA2131FNG
Characteristics
(Unless otherwise specified VCC1 = 2.8 V, VCC2 = 1.2 V, Rg = 600 , f = 1 kHz, Ta = 25C)
ICC - VCC2
1.0 1.0
VDC - VCC2
(Vref, OUT)
(mA)
0.8
0.8
ICC
Quiescent supply current
0.4
Output voltage
0.6
(V)
ICC5 0.6 0.4 0.2 ICC6 0.2 0 0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
0 0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
Supply voltage
VCC2
(V)
Supply voltage
VCC2
(V)
ICC - VCC2
1.0
MUTE ON
100
Po - VCC2
(mA)
ICC
(mW) Output volatage Po
ICC3
0.8
30
10 0.6
Quiescent supply current
3
0.4
1
0.2
0.3 ICC4 0 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 0.1 0.6 0.8 1.0 1.2 1.4 1.6 1.8
THD = 10 % A/Bch IN 2.0 2.2 2.4
Supply voltage
VCC2
(V)
Supply voltage
VCC2
(V)
ICC - Po
-80
Vno - VCC2
IHF-A -85 -90 -95 -100 -105 -110 -115 -120 0.6
(mA)
100
ICC
30
Consumption supply current
10
ICC8
3
1
ICC7
0.3
0.1 0.01
Output noise voltage
Vno
(dBV)
A/Bch IN
0.03
0.1
0.3
1
3
10
30
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
Output voltage
Po
(mW)
Supply voltage
VCC2
(V)
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TA2131FNG
THD - Po
10 0
R.R. - VCC2
inflow to VCC1
fr = 100 Hz Vr = -20dBV
(%)
3
R.R. (dB)
10 kHz
20
THD
1
Total harmonic distortion
0.3
Ripple rejection ratio
3 10 30 100 300
40
60
0.1 100 Hz/1 kHz 0.03
80
0.01 0.1
0.3
1
100 0.4
0.8
1.2
1.6
2.0
2.4
Output voltage
Po
(mW)
Supply voltage
VCC2
(V)
THD - VCC2
30 RL = 16 0 Po = 1 mW A/Bch IN
R.R. - VCC
inflow to VCC2
fr = 100 Hz Vr = -20dBV
(%)
10
(dB) R.R. Ripple rejection ratio
2.4
-20
THD
3
Total harmonic distortion
-40
1
-60
0.3 1 kHz
10 kHz 100 Hz
0.1
-80
0.03 0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
-100 0.4
0.8
1.2
1.6
2.0
2.4
Supply voltage
VCC2
(V)
Supply voltage
VCC2
(V)
Vo - f
0 -10 -30 -40
BEEP
(dBV)
(dBV) Beep output voltage
-20 -30 -40 -50 -60 -70 10
-50 -60 -70 -80 -90 -100 -110 0.1 fBEEP = 400 Hz Rectangle wave 0.3 0.5 1 3 5 10
Output voltage
Vo
30
100
300
1k
3k
10 k
30 k
Frequency
f
(Hz)
Beep input voltage
VBEEP
(Vp-o) (V)
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TA2131FNG
CT - f
0 1.0
ICC - Ta
(mA) Quiescent supply current ICC
Vo = -22 dBV
10
0.8
CT (dB)
20 Application circuit 1 30 40 (No use Low-Pass Compensation) 50 Application circuit 2 60 70 10
0.6
ICC5
Cross talk
0.4
ICC6 0.2
30
100
300
1k
3k
10 k
30 k
0 -50
-25
0
25
50
75
100
Frequency
f
(Hz)
Ambient temperature
Ta
(C)
VDC - Ta
1.0
VDC Output voltage
(V)
0.8
0.6
0.4
0.2
0 -50
-25
0
25
50
75
100
Ambient temperature
Ta
(C)
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TA2131FNG
Package Dimensions
Weight: 0.14 g (typ.)
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TA2131FNG
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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