TDA7284
RECORD/PLAYBACK CIRCUIT WITH ALC
WIDE OPERATING SUPPLY VOLTAGE (3V
to 12V)
VERY LOW INPUT NOISE (V
I
= 1.2
V)
INTERNAL
COMPENSATION
FOR
HIGH
GAIN APPLICATION (DOUBLE SPEED RE-
CORDING)
BUILT-IN ALC CIRCUITRY
GOOD SVR
DC CONTROLLED SWITCHES FOR MUTE
OR
EQUALIZATION
SWITCHING
FUNC-
TIONS
DESCRIPTION
The TDA7284 is a monolithic integrated circuit in
a DIP/SO-14 designed for 6V, 9V and 12V AC/DC
portable cassette equipment application.
May 1997
DIP14
SO14
ORDERING NUMBER:
TDA7284
TDA7284D
BLOCK DIAGRAM
1/14
Symbol
Parameter
Value
Unit
V
S
Supply Voltage
14
V
T
OP
Operating Temperature Range
-20 to 70
C
T
stg
, T
j
Storage and Junction Temperature Range
-40 to 150
C
THERMAL DATA
Symbol
Description
S014
DIP14
Unit
R
th j-amb
Thermal Resistance Junction-ambient
Max
200
120
C/W
DC CHARACTERISTICS (T
amb
= 25
; V
S
= 6V; V
i
= 0V; R
i
= 10K
; ALC = OFF)
Terminal No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Terminal Voltage (V)
0
0
0
0
2.6
0
1.3
1.3
0
2.6
6
4.6
0
0
ABSOLUTE MAXIMUM RATINGS
PIN CONNECTION (Top view)
TDA7284
2/14
Figure 1: Test and Application Circuit
TDA7284
3/14
Figure 2: P.C. Board and Component Layout of the Circuit of Fig. 1 (1:1 scale).
TDA7284
4/14
ELECTRICAL CHARACTERISTICS (V
S
= 6V, T
amb
= 25
C unless otherwise specified refer to test cir-
cuit)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
S
Supply Voltage
3
12
V
I
d
Quiescent Current
4.5
8
mA
E
n
Input Noise
R
g
= 2.2K
BW = 22Hz to 22kHz
1.2
V
R
I
Input Resistance
30
50
70
K
G
O
Open Loop Gain
65
78
dB
V
O
Output Voltage
THD < 1%
ALC OFF
ALC ON
1.2
0.7
1.8
0.9
1.1
V
rms
V
rms
THD
Total Harmonic Distortion
V
O
= 1V
rms
ALC = ON V
I
= 100mV
0.1
0.3
0.5
1
%
%
ALC Range
V
O
= 3dB
47
dB
CB
Channel Balance
ALC ON
0
2
dB
SVR
Supply Voltage Rejection
f = 120Hz, C
SVR
= 33
F
V
R
= 100mV, R
g
= 10K
ALC = Off
50
dB
CS
Cross-talk
ALC OFF
70
dB
Pin 3
Turn Off Threshold
I
O
= <1
A
0.8
1.3
V
Pin 3
Turn On Threshold
1.7
2.25
V
Pin 3
Turn On Saturation
R
L
= 10K
0.1
0.2
V
Figure 3: Drain Current vs. Supply Voltage
Figure 4: Recording Closed Loop Gain vs.
Frequency
TDA7284
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