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TA7658PTOSHIBAN/a2000avaiDual Preamplifier For Tape Recorder


TA7658P ,Dual Preamplifier For Tape RecorderTOSHIBA, ELECTRONIC DE DE. HDH72u? unm?u?a or-9097247 TOSHIBA: ELECTRoNiC H J&w,“,,mk9?§j37479A7658 ..
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TA7658P
Dual Preamplifier For Tape Recorder
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DUAL PREAMPLIFIER FOR TAPE RECORDER Unit in mm 'i'
The TA7658P is a dual preamplifier with ALC 1
(Automatic Level Control) designed for use in a ll 8 -,
_ record/playback amplifier of tape recorder. E
It is suitable for a stereo set and a radio- 'i"'-'"'"'""""':," 3 l
cassette recorder. E '
o 199MAX z msztuzs t
. DIP 14 PIN '(Dual In-Line Package) "3 l L 'it T
. Built-in Buffer Amplifier (It permits meter __i§[ 4 l
drive and ALC to be easily performed) ' L 3 ..3.
. No Input Coupling Capacitor 'i' asiulsl 'a54xuzs itzly
. Quick Stabilization at Power ON. 3 “”15 -2251”
. Wide Supply 1roltage Range: VCC=3"‘16v .Lead pitch is 254 and tolerance is
:025 against theoretical center of
each lead that is obtained on the
basis of No.1 and No.14 leads.
JEDEC -
TOSHIBA . 3D14A-P
BLOCK DIAGRAM
PLAYBACK TO VOLUME OF MAIN AMPLIFIER
s-tri-iii)'"-'"-'''--]''''"'''
Power supply
Buffer amplifier output (L)
Preamplifier output (L)
Preamplifier feedback (L)
Preamplifier Input (L)
ALC control Input
Ground (ALC side)
Preamplifier input (R)
10. Preamplifier feedback (R)
11. Ground
12. Preamplifier output (R)
GDNU‘U'IbUNH
13. Buffer amplifier output (R)
14. NC
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MAXIMUM RATINGS (Ta=25°C)
CHARACTERISTIC SYMBOL RATING UNIT
Supply Voltage Vcc 16 V
Output Current (Buffer amplifier Pin 2,Pin 13) 12, 113 3 mA
Output Current (Preamplifier Pin 6, Pin 9) 16, 19 2 mA
Power Dissipation (Note) 1 PD 625 mil
Operating-Temperature Topr 7 -25--75 oC
Storage Température _ Tstg -5r-150 "c
Note: Derated above Ta=25°C in the proportion of SmW/OC.
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified Ta=25°C, vce--5v, fr-1kBz)
. T TEST
CHARACTERISTIC SYMBOL CIR- TEST CONDITION MIN. TYP. MAX. UNIT
_ Quiescent Current ICCQ 1 - 6 10 15 mA
T Input Terminal DC Voltage V6, V9 1 - A - 15 50 mV
Output Terminal DC Voltage V3, V12 1 - 2.2 2.5 2.8 V
Buffer Output DC Voltage V2, v13 1 - 1.4 1.6 2 v E
ALC Bias Voltage " 1 - 0.4 0.55 0.7 V
ALC 0N Voltage VIN(ALC 1 V7=1.4V - 5 30 mV
ALC Range RALC 2 VIN---60dBm " 40 - dB
ALC Level V0UT(ALC) 2 V1N=-20dBm -3 .-1 1 dBm '5
g Total Harmonic Distortion THD(ALC 2 V1N=-20dBm - 0.6 2 , i
(ALC) 'i,
ALC Balance _ BALC 2 - _ - 0 2 dB ?
Max. Output Voltage Von 2 THD=lr. 1.3 1.7 - llrms
Channel Crosstalk CT 2 Rg=2.2kn, VOUT=0dBm 40 50 - dB
Open Loop Voltage Gain Gvo 2 V1N=-80dBm . 67 75 - dB
. 523:2?“ Input Noise Vm T 2 Rg=2.2m - 1.3 2.7 nvms
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TA7558P
TEST CIRCUIT 1
Vcc= 5v
‘: 150kQ
h 0.04:7111'
TEST METHOD
SYMBOL Sl Sg TEST POINT TEST PROCEDURE
ICCQ ON OFF Lt Read ammeter
V6, V9 0N OFF Ti, 176 Read voltemter
V3, V12 0N OFF 31, 32 Read voltmeter
V2, V13 0N OFF y.3, 11, Read voltmeter
V7 . 0N OFF 27 Read voltmeter
Measure the voltage on pin 6 and
VIN(AFC) ON ON LIS, 26 pin 9 when 1.4V in applied to pin 7
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TEST CIRCUIT 2
Vcc=5V°
4-7 on
TEST METHOD
a OUTPUT (L)
g B. I
BUFFER 2 .
C B.P.F
souz~20kHz
2 ag'iytlr VOUT
n a - - 1.mrn
''oHcc",, I-tfs-as/ie'?))'
l? lg; OUTPUT
IT (El h
—<:) OUTPUT (R) 3 El
1000 22/1?
--_----,
a 10):!) 0.015111”
BUFFER T _
H? m u;
v IO [6
DI-ri: ; 151555
l Da-Ds; 1N60
SYMBOL
TEST PROCEDURE
(Arty is obtained by GVO=20 log VoUT/VIN
(dB). If Input voltage ls VIN and
output voltage is_VOUT
VOUT(ALC)
Output voltage VOUT is measured with
a VTVM when input voltage
VtN---20dBm is applied.
THD(ALC)
Output voltage VOUT is measured with
a distortion meter when input voltage
1rae-20dB is applied.
S1-1=1 SI-I'"
31-2=2 S1-2=2
Output voltage VOUT at Rg=2.2k9 ls
measured with a VTVM, and is converted
by the gain of 1kHz.
Measure output voltage VOUT at total
harmonic distortion THD=12 is measured
with a VTVM.
Crosstalk between(L) and (R) at output
voltage VOUT=0dBm is measured.
Input voltage range from Vlu=-60dBm
to output voltage VOUT 3dB UP.
Level difference between output volt-
ages VOUT (L) and (R) at the time when
input voltage 1liN=-20dBm ls applied.
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EQUIVALENT CIRCUIT
PRE INPUT Ci)(i) PRE NF
_ o . POWER
J 1 SUPPLY
P] J J J oi'''
CONSTANT "t Rag 13W ----6, M1
CURRENT
BUFFER
BIAS SOURCE . Mo J? ---(i) OUTPUT
tks R 1 PREAMPLIFIER
. " OUTPUT
Fl‘ 17 .
. Q4 MI Q22
' Q13 ef,
-4,, tf, 9.1"
Am _ Q10 Q13
CONTROL T
INPUT A BUFFER
i 2s it; OUTPUT ,
_ '7 12 '
E Rte . PREAM'PLIFI ft
I V cf, I ' OUTPUT st?
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A.. r-l
PREAMPLIFIER PREAMPLIFIER
INPU 2
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DESCRIPTION OF EQUIVALENT CIRCUIT
BIAS CIRCUIT
The constant current circuit formed by Q1 and Q2 is connected to the constant
current bias source composed of being free from power supply variation for the
purpose of obtaining a bias source of higher power supply ripple suppression
ratio. Therefore, the operating current of the first stage transistor Q6 is not
affected by the power supply variation, and the ripple suppression ratio shows
a good characteristic since the operating electric potential of the first stage
(Q7 collector) ls stabilized, thus requiring no decoupling at the first stage.
AMPLIFIER
The first stage ls a complimentary differential stage of Q6 and Q7, the Input
terminal voltage (Q6 base) ls about "0"V, and the playback head can be directly'
coupled without a chemical capacitor.
Q1 not only sets the first stage current, but also functions as an active load.
The medium stage Q9 is approximately a phase inverter and level shift stage for
the gain 1. The output stage Q10 Is the emitter ground stage changing Q12 to
an active load. The current is defined by Q11 and Q12 as I(Q10)El.6mA.
At the back of the output stage, the emitter follower Q13 is directly coupled
in IC for buffering. Q13 is an open emitter, and the operating current can be
arbitrarily selected by an external resistor.
ALC CIRCUIT
The transistor Q5 for ALC (Automatic Level Control) is DC-coupled to the input
terminal. Therefore, Q6 bias resistor is connected in parallel between the
collector and emitter of Q5. ALC control terminal() (Q4 base) ls DC-biased in
about 0.55V by Q3. Consequently, attack time can be shortened since the
smoothing capacitor for ALC has been biased in 0.05V from the beginning.
VOLTAGE CAIN
o Open Loop Voltage Cain Gvo (IKHz) in Amplifier
ho<-:(Q])
t1vo(1kHz) = 2re(Q6) -R10
x hFE(Q10)x RL is obtained.
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====TOSHIBA
IF --------- 50kn
hoe(Q1)
hFE(Q10) = 20 is given, cird'-'5.5 x103i-74.9dB
= 10kn is realized.
2re(Q6) = lkn
0 = l.8kn
hoe(Ql) ...... Q1 output impedance
2re(Q6) ...... Q6 emitter junction resistance
0 Close Loop Voltage Gain Gv(lkHz)
- G 0 -
Gv(lkHz) - 1 + -GV0 .... ..... . (1) (f--- Feedback ratio)
, z-I-Hz-, Z2 ........ ..... ..... (2) 15 made.
If Gvo=75dB
" are given, put the equation (1) into
21 1000 the equation (2),
zz=13.3m
Gv(lkHz) = 1.32 x102 = 42.4dB ls obtained.
o Selection of External Resistors R1 and R2
R1 and R2 in the Internal equivalent circuit should be appropriately selected
to obtain output as much as possible. Output terminals (L) " pin 3 and
(R) = pin 12 can obtain the maximum output at the time of 1/2 Vcc.
Therefore, the values of R1 and R2 may be selected according to the following
equations.
V R +R .
v12(v3) =-1t-ii"-=-Yl'-2- x v10(v5) vlo(v5) = 1.1~1.2v
L channel is shown in (V3).
Graph "VOM, Ra-Vcc" shows the relation between Vcc and the maximum output at
the time when R1=150KR as parameter R2. The value of R2 should be selected
by taking the characteristics at decreasing voltage into due consideration.
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5) ALC ATTACK TIME AND RECOVERY TIME SETTING
-9"c--o ' (L) OUTPUT
r-Hrs------;' (R) OUTPUT
The attack time from the application of the input signal to the starting of ALC
can be adjustedby the time constants of R3 and C2, while the recovery time from
no application of the input signal to the restoration 6f amplifier gain can be
adjusted by the time constants of Ra and C2. In addition, silicon diode should
be used for DI and D2, while germanium diode for D3 and D4. A capacitor of
47PF or more should be used for C2.
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VOUT - VIN
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20 100 1k 10k . 2aht (12 (15 1 G t5 10 BO 5
FREQUENCY r fuss) INPUT VOLTAGE VIN (mvma) I
VOUT (ALC) - v
THD (ALC) IN
THD - Irour
_ A vouT (ALG) p;
g vcc=5v .5 E
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OUTPUT VOLTAGE Vou'r (vma) INPUT VOLTAGE VIN (dBm) l:
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TA7658P
EQUIVALENT INPUT NOISE VOLTAGE
MAX OUTPUT VOLTAGE v0“ (vme)
VIN (”Vms)
VNI - RB
Vcc=5V
Ta=2 "
il Soo GK 10k 100):
SIGNAL SOURCE RESISTANCE As (0)
POM, R2 - V00
RI--160kn
SUPPLY VOLTAGE Vcc (v)
l 6 8 "
EXTERNAL RESISTANCE 112 (kg)
Gvo 'VOM, Ical- Vcc
QUIESCENT CURRENT ICCQ (mA)
1.6 11
T 9 13 IT
SUPPLY VOLTAGE vcd for)
MAX OUTPUT VOLTAGE voM (vme)
Gvo.VoM. Iccq- Ta
Vcc=5V
f=lkHz
MAX OUTPUT VOLTAGE VOM (vma)
QUIESCENT CURRENT Icoq (m)
-2o o 20' IO 60
AMBIENT TEMPERATURE Ta ('0)
--tit5-
OPEN LOOP VOLTAGE GAIN a-vo (dB)
OPEN LOOP VOLTAGE GAIN Gvo (dB)
AUDIO LINEAR "2:.varcr.
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TA7658P
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APPLICATION CIRCUIT (REC/P.B)
m m OUTPUT (L)
vcc=sv
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amrn "
OSCILATER
..» CH
Each switch position is playback.
D1~D2:
_D3mD4:
181555 or Equivalent
1N60 or Equivalent
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TA7658P /Z
OUTPUT VOLTAGE V0(ALC) (dBv)
VOLTAGE GAIN Gv ((13)
OF APPLICATION CIRCUIT
GV,THD - f
Vcc=6V
GV (REC CIRCUIT)
(P. B CIRCUIT)
THD (REG CIRCUIT
vo=ou7vma
THD (P.B CIRCUIT)
1ro=ct1'i'1rrunrs
O 100 1k 10k 1
FREQUENCY f (Hz)
V0(ALC), THD(ALC) - VIN
Vcc=6V
_OdBv=lVrm9
v0 (ALC)
1 kHz lOkHz
THD (ALC_)
-'?0 -60 +30 -10 ~30 rao --1 0
INPUT VOLTAGE VIN (dBv)
mv- Amr
0' .1 :L J: .L o H
o o o o o 0
TOTAL HARMONIC DISTORTION THD (dB)
TOTAL HARMONIC DISTORTION THD (dB)
TOTAL HARMONIC DISTOETION THD (92)
TOTAL HARMONIC DISTORTION THD 0%)
THD - VOUT
a1 0.3 0.5 1 G
OUTPUT VOLTAGE VOUT (vme)
THD - VOUT
al a3 0.5 1 G
OUTPUT VOLTAGE VOUT (vma)
AUDIO LINEAR IC'. '.Ta",,".'r,

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