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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%)
: P
: P
· Low distortion and wide dynamic range
· Without turn-on “POP” for muting circuit
· Operating supply voltage range: V
= 0.6 W (typ.) (RL = 8 Ω) : TA7628P
out
= 0.96 W (typ.) (RL = 4 Ω) : TA7628HP
out
CC (opr)
= 3.5~9 V (Ta = 25°C)
Block Diagram
Weight: 1.00 g (typ.)
TA7628P/HP
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Switch Over
TA7628P/HP
Test Item SW
G
vo1
G
v1
V
out1
G
v2
V
out2
V
no2
ALC 1 2 OFF OFF OFF OFF
G
vo3
G
v3
P
out
V
no3
1
1 1 ON OFF OFF OFF
1 1 OFF OFF OFF OFF
1 1 OFF OFF OFF OFF
1 3 OFF OFF OFF OFF
1 3 OFF OFF OFF OFF
1 3 OFF OFF ON OFF
2 1 OFF ON OFF OFF
2 1 OFF OFF OFF OFF
2 1 OFF OFF OFF OFF
2 1 OFF OFF OFF ON
SW
2
SW
3
SW
4
SW
5
SW
6
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.
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 V
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.
Figure 1
and GND must be arranged near to this IC.
CC
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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.
Buffer amplifier
5.
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.
6. Power amplifier
(1) In case of the battery use (V
impedance of power supply is high.
In this case, it is recommended to insert the resistance R
(V
~Filter II). By this method, this IC becomes very stable. But the output DC voltage is not center
CC
by the influence of R
maximum output voltage is reduced. So we recommend to insert the other resistance R
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 R
for compensating output DC voltage. (Figure 3)
The recommended value:
TA7628P/HP
Figure 2
≤ 6 V), this IC is happen to oscillate (blocking oscillation) when the
CC
of 500 Ω~1 kΩ between pin 10 and pin 12
A
. Then the output wave shape is not symmetrical clipping wave and the
A
between
B
RB = 220 kΩ at VCC = 7.5 V
RB = 150 kΩ at VCC = 9 V
B
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 V
and GND is better to be large.
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TA7628P/HP
Maximum Ratings
(Ta = 25°C)
Characteristics Symbol Rating Unit
Supply voltage
Output current
Power dissipation
Operating temperature T
Storage temperature T
TA7628P 9
TA7628HP
TA7628P 0.56
TA7628HP
TA7628P 750
TA7628HP
VCC
12
I
O (peak)
1.5
PD (Note)
1200
−20~75 °C
opr
−55~150 °C
stg
V
A
mW
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, V
CC
=
6 V, f
Ta = 25°C)
Total
Characteristics Symbol
Quiescent current I
Quiescent current I
CCQ (1)
CCQ (2)
Test
Circuit
― VCC = 3.5 V 7 ― ― mA
― VCC = 6 V 9 ― 36 mA
Test Condition Min Typ. Max Unit
Pre amp.
=
1 kHz,
Characteristics Symbol
Open loop voltage gain G
Closed loop voltage gain G
Maximum output voltage V
Input resistance R
Equivalent input noise voltage V
vo1
v1
out1
IN1
ni
Test
Circuit
― ― 55 70 ― dB
― ― ― 40 ― dB
― THD = 1% ― 0.7 ― Vrms
― ― 24 30 ― kΩ
― R
Test Condition Min Typ. Max Unit
= 0 ― 1.4 2.5 µVrms
g
Pre amp. + Buffer amp.
Characteristics Symbol
Closed loop voltage gain G
Maximum output voltage V
Output noise voltage V
v2
out2
no2
ALC effect ALC1 ―
ALC range ALC2 ― Range of THD ≤ 1% ― 60 ― dB
Test
Circuit
Pre amp. G
―
Buffer amp. G
― THD = 3% 1.5 1.7 ― Vrms
― R
V
~0.0775 Vrms (−20dBm)
Test Condition Min Typ. Max Unit
= 40dB
v
= 20dB
v
= 0, G
g
= 0.775 mVrms (−60dBm)
in
= 60dB ― 1.2 2.5 mVrms
v2
― 60 ― dB
― 2 ― dB
Power amp.
Characteristics Symbol
Open loop voltage gain G
Closed loop voltage gain G
Output power P
Output noise voltage V
vo3
v3
out
no3
Test
Circuit
― ― 60 70 ― dB
― ― ― 40 ― dB
― R
― R
Test Condition Min Typ. Max Unit
= 8 Ω, THD = 10% 0.5 0.6 ― W
L
= 0, Gv = 40dB ― 0.3 1.0 mVrms
g
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TA7628P/HP
Electrical Characteristics
(TA7628HP) (unless otherwise specified, VCC = 6 V, f = 1 kHz,
Ta = 25°C)
Total
Characteristics Symbol
Quiescent current I
Quiescent current I
CCQ (1)
CCQ (2)
Test
Circuit
― VCC = 3.5 V 7.5 ― ― mA
― VCC = 6 V 11 ― 35 mA
Test Condition Min Typ. Max Unit
Pre amp.
Characteristics Symbol
Open loop voltage gain G
Closed loop voltage gain G
Maximum output voltage V
Input resistance R
Equivalent input noise voltage V
vo1
v1
out1
IN1
ni
Test
Circuit
― ― 55 70 ― dB
― ― ― 40 ― dB
― THD = 1% ― 0.7 ― Vrms
― ― ― 30 ― kΩ
― R
Test Condition Min Typ. Max Unit
= 0 ― 1.4 2.5 µVrms
g
Pre amp. + Buffer amp.
Characteristics Symbol
Closed loop voltage gain G
Maximum output voltage V
Output noise voltage V
v2
out2
no2
ALC effect ALC1 ―
ALC range ALC2 ― Range of THD ≤ 1% ― 60 ― dB
Test
Circuit
Pre amp G
―
Buffer amp. G
― THD = 3% 1.5 1.7 ― Vrms
― R
V
~0.0775 Vrms (−20dBm)
Test Condition Min Typ. Max Unit
= 40dB
v
= 20dB
v
= 0, Gv2 = 60dB ― 1.2 2.5 mVrms
g
= 0.775 mVrms (−60dBm)
in
― 60 ― dB
― 2 ― dB
Power amp.
Characteristics Symbol
Open loop voltage gain G
Closed loop voltage gain G
Output power P
Output noise voltage V
vo3
v3
out
no3
Test
Circuit
― ― 60 70 ― dB
― ― ― 40 ― dB
Test Condition Min Typ. Max Unit
RL = 4 Ω, THD = 10% 0.8 0.96 ―
―
― R
= 9 V, RL = 8 Ω,
V
CC
THD = 10%
= 0, Gv = 40dB ― 0.3 1.0 mVrms
g
― 1.4 ―
W
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Test Circuit
TA7628P/HP
*: Use in measuring the output noise voltage.
Note 1: TA7628HP: 0.047 µF → 0.068 µF
Note 2: TA7628HP: 470 µF → 1000 µF
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TA7628P/HP
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TA7628P/HP
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TA7628P/HP
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Application Circuit
TA7628P/HP
SW
~SW6 are set for play back.
1
SW Functions.
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Package Dimensions
TA7628P/HP
Weight: 1.00 g (typ.)
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TA7628P/HP
A
RESTRICTIONS ON PRODUCT USE
· 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.
000707EB
· The information contained herein is subject to change without notice.
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