TA2131FN

TA2131FN TOSHIBA Bipolar Linear IC Silicon Monolithic TA2131FN Low Current Consumption Headphone Amplifier for Portable MD Player (With Bass Boost Function) The TA2131FN 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 Ω) 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 = 25°C): VCC1 = 1.8~4.5 V VCC2 = 0.9~4.5 V Weight: 0.14 g (typ.) 1 2002-04-19 TA2131FN Block Diagram BEEP OFF ON BST NF1 Vref IN 22 Vref BST BEEP GND IN SW 21 20 19 18 VCC1 VCC1 DAC OUT (2.8 V) Vref Vref OFF ON OFF ON LPF1 24 23 Vref 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 2 2002-04-19 TA2131FN Terminal Explanation (Terminal voltage: Typical terminal voltage at no signal with test circuit, VCC1 = 2.8 V, VCC2 = 1.2 V, Ta = 25°C) Terminal No. Terminal Explanation Internal Circuit Terminal Voltage (V) 12 ADD 20 kW 20 kW 1 LPF2 BST amplifier 1 output (filter terminal) PWA AGC BST1 0.61 BST2 AMP 23 20 kW 10 kW 12 kW 23 LPF1 ADD amplifier output (filter terminal) 13 PWB 2 kW 30 kW 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 kW 2 BST NF2 12 20 kW ADD PWA 0.61 8 20 kW 3 BST OUT BST amplifier 2 output terminal 6 OUTB Power amplifier output 10 kW 10 kW BST1 OUT 10 kW 15 kW BST2 10 kW 3 0.61 20 kW 10 kW 10 kW 10 kW 6 20 kW 15 kW 8 OUTA 12 INA Power amplifier input 13 PWB 0.61 13 INB 2 3 2002-04-19 TA2131FN 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 kW (typ.) 4 AGC IN 5 kW Vref 0.61 4 10 kW 14 5 DET Smoothing of boost AGC level detection 5.1 kW 5 ¾ 7 PWR GND GND of power amplifier output stage VCC (+B) at power amplifier output stage ¾ 0 9 VCC2 ¾ 1.2 10 BEEP OUTA Beep sound output terminal 14 ¾ 10 kW 10 11 0 11 BEEP OUTB 19 Beep sound input terminal Receives beep sound signals from microcomputer. Main VCC 19 BEEP IN 14 VCC1 ¾ 2.8 14 Mute smoothing Power mute switch Reduces the shock noise during switching 15 MT TC 12 kW 1.2 15 4 2002-04-19 TA2131FN 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 kW ¾ 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 ¾ 47 kW 18 BST SW Bass boost ON/OFF switch “H” level/OPEN: BST ON “L” level: BST OFF Refer to function explanation 5 14 20 kW ¾ 18 20 GND GND of input stage in power amplifier ¾ 0 14 21 Vref IN Reference voltage circuit filter terminal 4 kW 0.61 10 kW 22 Vref Reference voltage circuit 21 10 kW 22 0.61 5 2002-04-19 TA2131FN Function Explanation 1. Bass Boost Function 1-1 Description of Operation TA2131FN 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). INA 20 kW 22 10 mF DAC OUT 10 mF Vref 20 kW 20 kW OUTA ADD 10 kW 20 kW BST1 2 kW 30 kW 10 kW 12 kW BST2 10 kW 20 kW 10 kW 15 kW 10 kW 15 kW 10 kW PWB PWA 10 kW 2 V (OUT) 220 mF V (RL) 16 W RL BST NF2 8 1 mF 10 kW INB 21 20 kW BST AGC 10 kW Vref V (NF2) 220 mF 16 W RL 5 kW 4 OUTB LPF1 V (LPF1) 11 0.1 mF DET 5 AGC IN BST NF1 6 10 4.7 mF 0.1 mF V (NF1) 9 LPF2 V (LPF2) BST OUT 7 0.1 mF 22 kW V (BST OUT) 0.1 mF 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. 6 2002-04-19 TA2131FN 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 2. During Bass Boost (Frequency Characteristics to Each Terminal) 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 W and an attempt is being made to achieve frequency characteristics of ±3 dB at 20 Hz, a large capacity condenser of C = 470 mF is required. Bearing this situation in mind, a low-pass compensation function was built in to the TA2131FN, 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 W) and the output coupling condenser (220 mF) in the C-coupling system. 20 kW INA 12 10 mF DAC OUT 10 mF 13 INB 20 kW OUTA 10 kW ADD BST2 10 kW 20 kW 10 kW 15 kW 10 kW 15 kW 10 kW PWB 20 kW PWA 10 kW 8 V (OUT) V (RL) 220 mF 16 W RL BST NF2 2 1 mF Vref 20 kW Vref 10 kW 6 OUTB 220 mF 16 W RL Figure 3 Low-Pass Compensation System Diagram 7 2002-04-19 TA2131FN 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 W RL = 16 W Filter: LPF 80 kHz Output C = 220 mF 0 Vref short C = 1 mF C = 2.2 mF Response (dB) C = 0.47 mF -10 10 30 100 300 1k 3k 10 k 30 k f (Hz) Figure 5 Condenser and f Characteristics for Low-Pass Compensation 8 2002-04-19 TA2131FN CT – f VCC1 = 2.8 V VCC2 = 1.2 V Rg = 620 W RL = 16 W Vo = -22dBV WIDE BAND Output C = 220 mF C = 1 mF 0 C = 0.47 mF CT (dB) -20 C = 2.2 mF -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 9 2002-04-19 TA2131FN 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 Terminal voltage V17, V18 Terminal voltage V16 3 3 H 2 2 1.6 V 1 0.6 V L 0 1 2 3 4 5 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. 10 2002-04-19 TA2131FN 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 = 25°C in the proportion of 4 mW/°C. Electrical Characteristics (Unless specified otherwise, VCC1 = 2.8 V, VCC2 = 1.2 V, Rg = 600 W, RL = 16 W, f = 1 kHz, Ta = 25°C) 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 W, 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 ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ 10 -1.5 5 ¾ ¾ -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 ¾ ¾ 14 dB 1.5 ¾ 0.3 -96 ¾ ¾ dB ¾ ¾ -43 7 16 19.5 dB dBV mW % dBV mA Unit mA mA mA 11 2002-04-19 TA2131FN Test Circuit Vref Rg = 600 W Vref Vref 10 mF VCC1 (a) 0.1 mF 4.7 mF 4.7 mF OFF ON 23 LPF1 22 Vref 21 Vref IN 20 GND 19 BEEP IN 18 BST SW 17 16 15 14 VCC1 (b) VCC1 (b) (a) SW1 1 mF (a) SW4B (2.8 V) 600 W (b) 10 mF 600 W +B (1.2 V) Vref 10 mF SW4A (a) 16 W (b) 13 INB INA 12 SW2 SW3 24 BST NF1 MT SW PW SW MT TC TA2131FN LPF2 1 0.1 mF BST NF2 2 BST OUT 3 AGC IN 4 DET 5 OUTB 6 220 mF PWR GND 7 OUTA 8 220 mF VCC2 9 BEEP OUTA 10 BEEP OUTB 11 0.1 mF 22 kW 0.1 mF (*) (*) 16 W Vref Vref (*) 0.22 mF + 10 W Monolithic ceramic capacitor 12 2002-04-19 TA2131FN Application Circuit 1 DAC OUT (2.8 V) 10 mF 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 mF (*) (*) 220 mF 0.1 mF DAC OUT Vref Vref BEEP 100 kW VCC1 OFF 0.1 mF VCC1 ON OFF 1 mF BEEP OUTA 10 ON 0.1 mF 10 mF 4.7 mF 4.7 mF MT SW PW SW MT TC TA2131FN LPF2 1 0.1 mF BST NF2 2 BST OUT 3 AGC IN 4 22 kW DET 5 OUTB 6 PWR GND 7 OUTA 8 VCC2 9 1 mF RL Vref Vref RL +B (1.2 V) (*) 0.22 mF + 10 W Monolithic ceramic capacitor 13 2002-04-19 10 mF 0.1 mF TA2131FN Application Circuit 2 (Low-Pass Compensation/Bass Boost Function/Beep Not Used) VCC1 OFF 10 mF 4.7 mF VCC1 DAC OUT (2.8 V) 10 mF 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 mF (*) (*) 220 mF DAC OUT Vref ON OFF 1 mF BEEP OUTA 10 ON MT SW PW SW MT TC TA2131FN 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 mF + 10 W Monolithic ceramic capacitor 14 2002-04-19 10 mF TA2131FN Characteristics (Unless otherwise specified VCC1 = 2.8 V, VCC2 = 1.2 V, Rg = 600 W, f = 1 kHz, Ta = 25°C) ICC – VCC2 1.0 1.0 VDC – VCC2 (Vref, OUT) (mA) 0.8 0.8 ICC Quiescent supply current 0.6 Output voltage (V) ICC5 0.6 0.4 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 (mA) 100 -80 A/Bch IN 30 -85 -90 -95 -100 -105 -110 -115 -120 0.6 Vno – VCC2 IHF-A ICC Consumption supply current 10 ICC8 3 1 ICC7 0.3 0.1 0.01 0.03 0.1 0.3 1 3 10 30 Output noise voltage Vno (dBV) 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) 15 2002-04-19 TA2131FN THD – Po 10 0 R.R. – VCC2 inflow to VCC1 fr = 100 Hz Vr = -20dBV (%) 3 Ripple rejection ratio R.R. (dB) 3 10 30 100 300 20 THD 1 Total harmonic distortion 40 0.3 10 kHz 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 W Po = 1 mW A/Bch IN 0 R.R. – VCC inflow to VCC2 fr = 100 Hz Vr = -20dBV (%) 10 Ripple rejection ratio R.R. (dB) -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 2.4 -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) 16 2002-04-19 TA2131FN 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 Output voltage VDC (V) 0.8 0.6 0.4 0.2 0 -50 -25 0 25 50 75 100 Ambient temperature Ta (°C) 17 2002-04-19 TA2131FN Package Dimensions Weight: 0.14 g (typ.) 18 2002-04-19 TA2131FN RESTRICTIONS ON PRODUCT USE 000707EBA · 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. 19 2002-04-19