AMPLIFIER SYSTEM FOR CASSETTE TAPE RECORDER
Description
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 appli...
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