STMICROELECTRONICS TDA7285

TDA7285
STEREO CASSETTE PLAYER AND
MOTOR SPEED CONTROLLER
WIDE OPERATING SUPPLY VOLTAGE (1.8V
to 6V)
HIGH OUTPUT POWER (30mW/32Ω/3V)
LOW DISTORTION DC VOLUME CONTROL
NO BOUCHEROT CELL
LOW QUIESCENT CURRENT (15mA)
NO INPUT CAPACITORS FOR PREAMPLIFIERS
LOW MOTOR REFERENCE VOLTAGE
(200mV)
DESCRIPTION
The TDA7285 is a monolithic integrated circuit
designed for the portable players market and assembled in a plastic DIP20 and SO20. The internal functions are: preamplifier, DC volume con-
DIP20
SO20
ORDERING NUMBERS:
TDA7285
TDA7285D
trol, headphone driver and motor speed controller.
BLOCK DIAGRAM
May 1997
1/11
TDA7285
PIN CONNECTION (Top view)
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
Supply Voltage
8
V
IOmax
Maximum Output Current
70
mA
Im max
Maximum Motor Current
700
mA
VS
Ptot
Total Power Dissipation Tamb = 90°C
0.9
W
Top
Operating Temperature
-20 to +70
°C
Storage and Junction Temperature
-40 to 150
°C
Tstg, Tj
THERMAL DATA
Symbol
Rth j-amb
Description
Thermal Resistance Junction-ambient
SO20
DIP20
Unit
150
100
°C/W
DC CHARACTERISTICS (Tamb = 25°C; VS = 3V; RL = 32Ω (Headphone) and RL = 10KΩ (Preamplifier);
Vi = 0; VOL. Control = Vref).
Terminal No
1
Term. Volt. (V)
0
2/11
2
3
4
5
6
7
1.5 1.5 1.5 1.5 2.7 1.4
8
9
10
11
12
13
14
0
2.8
0
1.6
3
3
1.4 1.5 1.5 1.5 1.5 1.5 1.5
15
16
17
18
19
20
TDA7285
ELECTRICAL CHARACTERISTICS (VS = 3V; RL = 32Ω, Vol. Control = 2/3 Vref (pin 20); Tamb = 25°C; f =
1KHz; unless otherwise specified
Symbol
Parameter
VS
Supply Range
Id
Total Quiescent Drain Current
Test Condition
Min.
Typ.
1.8
15
Max.
Unit
6
V
22
mA
PLAYBACK AMPLIFIER
Gvo
Open Loop Gain
70
dB
Gv
Close Loop Gain
33
dB
VO
Output Voltage
THD = 1%
Total Harmonic Distortion
VO = 330mVrms
THD
Ib
Bias Current
Ct
Cross Talk
600
750
0.05
mV
0.25
%
3
µA
R S = 2.2KΩ; VO = 330mVrms
74
dB
en
Total Input Noise
RS = 2.2KΩ; B = 22Hz to 22KHz
1.2
µV
SVR1
Ripple Rejection
R S = 2.2KΩ; Vr = 100mVrms
f = 100Hz; C SVR = 100µF
50
dB
HEADPHONE DRIVER
VDC
Output DC Voltage
PO
Output Power
THD = 10%
1.4
V
30
mW
P O1
Transient Output Power
GV
Close Loop Gain
THD = 10% RL = 16Ω
50
mW
PO = 5mW
31
dB
75
dB
Volume Control range
THD
Ct
SVR2
20
66
Total Harmonic Distortion
PO = 5mW
0.3
1
%
Cross Talk
PO = 5mW; RS = 10KΩ
50
dB
Ripple Rejection
R S = 600Ω; Vr = 100mV
f = 100Hz; C SVR = 100µF
47
dB
MOTOR SPEED CONTROL
Vref
K
V sat
∆ Vref
⁄ ∆ VS
Vref
∆K
⁄ ∆ VS
K
∆ Vref
⁄ ∆ Im
Vref
∆K
⁄ ∆ Im
K
∆ Vref
⁄ ∆ Tamb
Vref
∆K
⁄ ∆ Tamb
K
Motor Reference Voltage (pin 12)
0.18
0.20
0.22
V
45
50
55
-
Im = 100mA
0.13
0.30
V
Im = 100mA;
VS = 1.8 to 6V
0.20
0.8
%/V
Voltage Characteristics of Shunt
Ratio
Im = 100mA;
VS = 1.8 to 6V
0.80
3
%/V
Load Regulation
Im = 30 to 200mA
0.015
0.08
%/mA
Current Characteristics of Shunt
Ratio
Im = 30 to 200mA
0.03
0.1
%/mA
Temperature Characteristics of
Reference Voltage
Im = 100mA
Tamb = -20 to +60°C
0.04
%/°C
Temperature Characteristics of
Shunt Ratio
Im = 100mA
Tamb = -20 to +60°C
0.02
%/°C
Shunt Ratio
Im = 100mA
Residual Voltage
Line Regulation
3/11
TDA7285
Figure 1: Test and Application Circuit
Figure 2: P.C. Board and Component Layout of the Circuit of Figure 2 (1:1 scale)
4/11
TDA7285
Figure 3: Quiescent Drain Current vs. Supply
Voltage
Figure 4: Reference voltage VS/2 (pin 20) vs.
Supply Voltage
Figure 5: Closed Loop Gain vs. Frequency
(PREAMPLIFIER)
Figure 6: Distortion vs. Frequency
(PREAMPLIFIER)
VS = 3V
VO = 330mVrms
RL = 10KΩ
Figure 7: Supply Voltage Rejection vs.
Frequency (PREAMPLIFIER)
Figure 8: Quiescent Output Voltage vs. Supply
Voltage (DRIVER)
VS = 3V
RS = 2.2KΩ
VR = 100mVrms
CSVR = 100µF
5/11
TDA7285
Figure 9: Closed Loop Gain vs. Frequency
(DRIVER)
Figure 10: Output Power vs. Supply Voltage
(DRIVER)
Figure 11: Distortion vs. Output Power (DRIVER)
Figure 12: Distortion vs. Frequency (DRIVER)
Figure 13: Supply Voltage Rejection vs.
Frequency (DRIVER
Figure 14: Volume Control (0dB = 10mW;
VS = 3V; RVOL = 50KΩ; RL = 32Ω;
f = 1KHz) (DRIVER)
VS = 3V
RS = 600Ω
VR = 100mVrms
CSVR = 100µF
6/11
TDA7285
Figure 15: Reference Voltage (Pin 12) vs. Supply Voltage (MOTOR)
Figure 16: Shunt Ratio vs. Supply Voltage (MOTOR)
Figure 17: Sunt Ratio vs. Load Current (MOTOR)
Figure 18: Saturation Voltage vs. Load Current
(MOTOR)
Figure 19: Speed Variations vs. Supply Voltage
(MOTOR)
Figure 20: Speed Variations vs. Motor Current
(MOTOR)
7/11
TDA7285
APPLICATION INFORMATION
Figure 21.
RT
− RM ) + Vref
Eg = RT Id + IM (
K
Rb RT
1
[1+
+
(1+ )]
RS RS
K
RS has to be adjusted so that the applied voltage
VM is suitable for a given motor, the speed is then
linearly adjustable varing RB.
8/11
The value RT is calculated so that
RT (max.) > K(min.) * RM (min.)
if RT (max.) > K * RM, instability may occur.
The values of C15 (4.7µF typ.) and C14 (1µF
typ.) depend on the type of motor used. C15 adjusts WOW and flutter of the system. C14 suppresses motor spikes.
TDA7285
SO20 PACKAGE MECHANICAL DATA
mm
DIM.
MIN.
TYP.
A
a1
inch
MAX.
MIN.
TYP.
2.65
0.1
0.104
0.3
a2
MAX.
0.004
0.012
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
12.6
13.0
0.496
0.512
E
10
10.65
0.394
0.419
e
1.27
0.050
e3
11.43
0.450
F
7.4
7.6
0.291
0.299
L
0.5
1.27
0.020
0.050
M
S
0.75
0.030
8 (max.)
9/11
TDA7285
DIP20 PACKAGE MECHANICAL DATA
mm
DIM.
MIN.
a1
0.254
B
1.39
TYP.
MAX.
MIN.
TYP.
MAX.
0.010
1.65
0.055
0.065
b
0.45
0.018
b1
0.25
0.010
D
25.4
1.000
E
8.5
0.335
e
2.54
0.100
e3
22.86
0.900
F
7.1
0.280
I
3.93
0.155
L
Z
10/11
inch
3.3
0.130
1.34
0.053
TDA7285
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. SGSTHOMSON 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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11/11