SGS Thomson Microelectronics TDA7284D, TDA7284 Datasheet
RECORD/PLAYBACK CIRCUIT WITH ALC
WIDE OPERATING SUPPLY VOLTAGE (3V
to 12V)
VERYLOW INPUT NOISE (V
INTERNAL COMPENSATION FOR HIGH
GAIN APPLICATION (DOUBLE SPEED RECORDING)
BUILT-INALC CIRCUITRY
GOODSVR
DC CONTROLLED SWITCHES FOR MUTE
OR EQUALIZATION SWITCHING FUNCTIONS
DESCRIPTION
The TDA7284 is a monolithic integrated circuit in
a DIP/SO-14designed for 6V, 9V and 12VAC/DC
portable cassetteequipmentapplication.
BLOCK DIAGRAM
= 1.2µV)
I
TDA7284
DIP14 SO14
ORDERING NUMBER:
TDA7284 TDA7284D
May 1997
1/14
TDA7284
PIN CONNECTION (Topview)
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
T
T
stg,Tj
S
OP
Supply Voltage 14 V
Operating Temperature Range -20 to 70
°
Storage and Junction Temperature Range -40 to 150 °C
C
THERMAL DATA
Symbol Description S014 DIP14 Unit
R
th j-amb
DC CHARACTERISTICS (T
Thermal Resistance Junction-ambient Max 200 120
=25°;VS= 6V;Vi= 0V;Ri= 10KΩ; ALC= OFF)
amb
Terminal No. 1 2 3 4567891011121314
Terminal Voltage(V) 0 0 0 0 2.6 0 1.3 1.3 0 2.6 6 4.6 0 0
C/W
°
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Figure 1: Test and ApplicationCircuit
TDA7284
3/14
TDA7284
Figure 2: P.C.Board and ComponentLayout of the Circuit of Fig. 1 (1:1 scale).
4/14
TDA7284
ELECTRICAL CHARACTERISTICS (VS= 6V, T
=25°C unless otherwise specified refer to test cir-
amb
cuit)
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
S
I
d
E
n
R
I
G
O
V
O
THD Total Harmonic Distortion VO=1V
CB Channel Balance ALC ON 0 2 dB
SVR Supply Voltage Rejection f = 120Hz, C
CS Cross-talk ALC OFF 70 dB
Pin 3 Turn Off Threshold I
Pin 3 Turn On Threshold 1.7 2.25 V
Pin 3 Turn On Saturation R
Supply Voltage 3 12 V
Quiescent Current 4.5 8 mA
Input Noise Rg= 2.2KΩ
1.2 µV
BW = 22Hz to 22kHz
Input Resistance 30 50 70 KΩ
Open Loop Gain 65 78 dB
Output Voltage THD < 1% ALC OFF
ALC ON
ALC = ON VI= 100mV
rms
ALC Range
= 3dB 47 dB
V
∆
O
=33µF
V
= 100mV, Rg= 10K
R
SVR
Ω
1.2
0.7
1.8
0.9 1.1
0.1
0.3
0.5
1
50 dB
ALC = Off
=<1µA 0.8 1.3 V
O
= 10KΩ 0.1 0.2 V
L
V
rms
V
rms
%
%
Figure 3: DrainCurrent vs. Supply Voltage Figure 4: RecordingClosed Loop Gain vs.
Frequency
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