TDA7273
SINGLE CHIP STEREO CASSETTE PLAYBACK SYSTEM
WIDE OPERATING SUPPLY VOLTAGE
(1.8V to 7V)
INPUT COUPLING WITHOUT CAPACITORS
BUILT-IN DC STEREO VOLUME CONTROL
BUILT-IN RIPPLE FILTERS
LOW QUIESCENT CURRENT
NO EXTERNAL BOUCHEROT CELL
MAX OUTPUT CURRENT 70mA PEAK
DESCRIPTION
The TDA7273 is a monolithic integrated circuit
designed for portable cassette players market.
It comprises preamplifiers, DC volume control,
and headphone drivers.
May 1997
BLOCK DIAGRAM
DIP16
SO16
ORDERING NUMBERS:
TDA7273
TDA7273D
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ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Test Conditions
Unit
V
S
Supply Voltage
9
V
I
o
Output Current (max)
70
mA
T
op
Operating Temperature Range
-20 to 70
C
T
stg ,
T
j
Storage & Junction Temperature Range
-40 to +150
C
THERMAL DATA
Symbol
Description
DIP-16
SO-16
Unit
R
thj-amb
Thermal Resistance Junction-ambient
Max
100
200
C/W
DC CHARACTERISTICS: T
amb
= 25
C; V
S
= 3V; R
L
= 10K
(Preamplifier), R
L
= 32
(Headphone);
V
IN
= 0; V
OL
control = V
ref
Terminal No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Terminal Voltage (V)
0
1.5
1.5
1.5
1.5
2.7
1.5
0
3
1.5
1.5
1.5
1.5
1.5
1.5
1.5
TEST CIRCUIT
TDA7273
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ELECTRICAL CHARACTERISTICS (T
amb
= 25
C, V
S
= 3V, f = 1KHz, R
L
= 32
Vol. control = 2/3V
ref
unless otherwise specified)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
S
Supply Voltage
1.8
7
V
I
d
Quiescent Current
14
20
mA
Vref
Reference Voltage
1.3
1.49
1.7
V
PREAMPLIFIER SECTION
G
VO
Open Loop Gain
70
dB
G
V
Close Loop Gain
30
33
35
dB
V
o
Output Voltage
THD = 1%
600
850
mV
I
b
Bias Current
3
A
THD
Total Harmonic Distortion
V
o
= 330mVrms
0.05
0.25
%
C
t
Cross Talk
Rg = 2.2K
; V
o
= 330mVrms
74
dB
E
N
Output Noise
Rg = 2.2K
; BW = 22Hz to 22KHz
100
V
SVR
Ripple Rejection
R
g
= 2.2K
V
R
= 100mVrms
f = 100Hz; C
SVR
= 100
F
40
50
dB
HEADPHONE DRIVER
V
o(DC)
DC Output Voltage
1.50
V
P
o
Output Power
THD = 10%;
15
30
mW
P
o
Transient Output Power
THD = 10% RL = 16
50
mW
G
V
Close Loop Gain
P
o
= 5mW
28
31
34
dB
THD
Total Harmonic Distortion
P
o
= 5mW
0.2
1
%
C
t
Cross Talk
Rg = 10K
; P
o
= 5mW
40
50
dB
SVR
Ripple Rejection
V
r
= 100mVrms, f = 100Hz
Vol. control = 1/3V
ref
C
SVR
= 100
F; R
g
=600
47
dB
Volume Control Range
66
75
dB
PIN CONNECTION (Top view)
TDA7273
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Figure 1: Application Circuit
Figure 2: P.C. Board and Component Layout of the Circuit of Figure 1 (1:1 scale)
TDA7273
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Figure 7: SVR vs. Frequency (PREAMPLIFIER)
Figure 6: THD vs. Frequency (V
S
= 3V,
V
o
=330mVrms, R
L
= 10K
)
(PREAMPLIFIER)
Figure 5: Closed Loop Gain vs. Frequency
(V
S
= 3V) (PREAMPLIFIER)
Figure 3: Supply Current vs. Supply Voltage
(Preamplifier + Driver)
Figure 4: V
ref
, vs. Supply Voltage (pin 16)
Figure 8: Quiescent Output Voltage vs. Supply
Voltage (DRIVER)
V
S
= 3V
R
g
= 2.2K
V
R
= 100mVrms
C
SVR
= 100
F
TDA7273
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Figure 13: SVR vs. Frequency V
S
= 3V (R
L
=
32
, V
r
= 100Vrms R
g
= 600
,
C
SVR
= 100mV)
(DRIVER)
Figure 10: Output Power vs. Supply Voltage
(Vol = 2/3V
ref
, R
L
= 32
,
THD = 10%,
f = 1KHz) (DRIVER)
Figure 14: Volume Control (0dB = 10mW,
V
S
= 3V R
vol
= 50K
, R
L
= 32
,
f = 1KHz) vs. Volume Setting (DRIVER)
Figure 12: THD vs. Frequency (P
o
= 5mW, V
S
=
3V R
L
= 32
)
(DRIVER)
Figure 11: THD vs. Output Power (V
o
= 2/3V
ref
,
V
S
= 3V, R
L
= 32
, f = 1KHz)
(DRIVER)
Figure 9: Closed Loop Gain vs Frequency
(V
S
= 3V, R
L
= 32
)
(DRIVER)
TDA7273
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DIP16 PACKAGE MECHANICAL DATA
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
a1
0.51
0.020
B
0.77
1.65
0.030
0.065
b
0.5
0.020
b1
0.25
0.010
D
20
0.787
E
8.5
0.335
e
2.54
0.100
e3
17.78
0.700
F
7.1
0.280
I
5.1
0.201
L
3.3
0.130
Z
1.27
0.050
TDA7273
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SO16 PACKAGE MECHANICAL DATA
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
2.65
0.104
a1
0.1
0.2
0.004
0.012
a2
2.45
0.096
b
0.35
0.49
0.014
0.019
b1
0.23
0.32
0.009
0.013
C
0.5
0.020
c1
45
(typ.)
D
10.1
10.5
0.398
0.413
E
10.0
10.65
0.394
0.419
e
1.27
0.050
e3
8.89
0.350
F
7.4
7.6
0.291
0.299
L
0.5
1.27
0.020
0.050
M
0.75
0.030
S
8
(max.)
TDA7273
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Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-
THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
1997 SGS-THOMSON Microelectronics Printed in Italy All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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TDA7273
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