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TA7628P Dataheets PDF



Part Number TA7628P
Manufacturers Toshiba Semiconductor
Logo Toshiba Semiconductor
Description AMPLIFIER SYSTEM FOR CASSETTE TAPE RECORDER
Datasheet TA7628P DatasheetTA7628P Datasheet (PDF)

TA7628P/HP TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic TA7628P,TA7628HP Amplifier System for Cassette Tape Recorder TA7628P and TA7628HP are Pre + Power amplifier system designed for cassette tape recorder. Features · Recording playback for pre amplifier · Buffer amplifier (recording amplifier) · Power amplifier · ALC detector circuit · Muting circuit · Maximum output power (VCC = 6 V, f = 1 kHz, THD = 10%) : Pout = 0.6 W (typ.) (RL = 8 Ω) : TA7628P : Pout = 0.96 W (typ.) (RL .

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TA7628P/HP TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic TA7628P,TA7628HP Amplifier System for Cassette Tape Recorder TA7628P and TA7628HP are Pre + Power amplifier system designed for cassette tape recorder. Features · Recording playback for pre amplifier · Buffer amplifier (recording amplifier) · Power amplifier · ALC detector circuit · Muting circuit · Maximum output power (VCC = 6 V, f = 1 kHz, THD = 10%) : Pout = 0.6 W (typ.) (RL = 8 Ω) : TA7628P : Pout = 0.96 W (typ.) (RL = 4 Ω) : TA7628HP · Low distortion and wide dynamic range · Without turn-on “POP” for muting circuit · Operating supply voltage range: VCC (opr) = 3.5~9 V (Ta = 25°C) Weight: 1.00 g (typ.) Block Diagram 1 2002-03-05 Switch Over Gvo1 Gv1 Vout1 Gv2 Vout2 Vno2 ALC Gvo3 Gv3 Pout Vno3 Test Item TA7628P/HP SW1 1 1 1 1 1 1 1 2 2 2 2 SW2 1 1 1 3 3 3 2 1 1 1 1 SW3 ON OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF SW4 OFF OFF OFF OFF OFF OFF OFF ON OFF OFF OFF SW5 OFF OFF OFF OFF OFF ON OFF OFF OFF OFF OFF SW6 OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF ON Precaution for Use 1. Precaution of GND line The GND points of input side GND and N.F side GND in each amplifier must be arranged at the preamplifier side. (Figure 1) The input side GND point and the N.F side GND point must be arranged near each other to have no impedance. Figure 1 2. About radiation (1) The capacitance between the output and GND in preamplifier, buffer amplifier and power amplifier must be arranged near to this IC. The radiation loop must be as small as possible. (2) The voltage gain of high frequency in each amplifier must be reduced to reduce the noise with high frequency component. (In the application circuit, the feed back capacitor is used) A 1000 pF or same order capacitor must be connected from the input terminal of preamplifier and power amplifier to GND to prevent the interference of radiation. (3) It is better for this IC to separate adequately from the antenna in the radio cassette tape recorder applications. (4) The electrolytic capacitance 100 µF~220 µF between VCC and GND must be arranged near to this IC. 3. To prevent the oscillation (1) The output terminal of preamplifier must be terminated to GND by the capacitance more than 5600 pF. (The recommended value: C = 0.01 µF) (2) The output terminal of buffer amplifier must be terminated to GND by the capacitance more than 0.01 µF. (The recommended value: C = 0.01 µF) (3) The output terminal of power amplifier must be terminated to GND by the good temperature characteristic capacitance of 1~2.2 µF. The bootstrap terminal must be terminated to GND with the capacitance more than 0.47 µF. 2 2002-03-05 TA7628P/HP 4. Precaution of preamplifier (1) It is better that the coupling capacitor between the volume and the output of preamplifier is small. Recommended value: C = 0.47 µF (2) In recording mode, the signal source resistance must be more than 1 kΩ for ALC (Automatic Level Control) operation. When this resistance is small, the ALC range becomes narrow. 5. Buffer amplifier When the output signal is clipped in the buffer amplifier, this signal returns to preamplifier and influences to make THD bad. To prevent this, in playback mode, the buffer amplifier is recommended to be cut-off by terminating the output terminal to GND directly or by terminating the feedback terminal to GND through 330 Ω or less than this shown in Figure 2. Figure 2 6. Power amplifier (1) In case of the battery use (VCC ≤ 6 V), this IC is happen to oscillate (blocking oscillation) when the impedance of power supply is high. In this case, it is recommended to insert the resistance RA of 500 Ω~1 kΩ between pin 10 and pin 12 (VCC~Filter II). By this method, this IC becomes very stable. But the output DC voltage is not center by the influence of RA. Then the output wave shape is not symmetrical clipping wave and the maximum output voltage is reduced. So we recommend to insert the other resistance RB between pin 6 and pin 8 for compensating the output DC voltage. (2) When you use this IC at the supply voltage of more than 6 V, it is better to insert the resistance RB for compensating output DC voltage. (Figure 3) The recommended value: RB = 220 kΩ at VCC = 7.5 V RB = 150 kΩ at VCC = 9 V Figure 3 (3) The output coupling capacitance and bootstrap capacitance is better to be large because of getting the maximum output power. (4) On the PC board, the interval between VCC and GND is better to be large. 3 2002-03-05 TA7628P/HP Maximum Ratings (Ta = 25°C) Characteristics Symbol Rating Unit Supply voltage TA7628P TA7628HP Output current TA7628P TA7628HP Power dissipation TA7628P TA7628HP Operating temperature Storage temperature VCC IO (peak) PD (Note) Topr Tstg 9 12 0.56 1.5 750 1200 −20~75 −55~150 V A mW °C °C Note: Derated above Ta = 25°C in the proportion, 6.0 mW/°C for TA7628P, 9.6 mW/°C for TA7628HP. Electrical Characteristics (TA7628P) (unless otherwise specified, VCC = 6 V, f = 1 kHz, Ta = 25°C) Total Char.


TA7628HP TA7628P HD6437021C02X


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