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TDA7285
STEREO CASSETTE PLAYER AND MOTOR SPEED CONTROLLER
WIDE OPERATING SUPPLY VOLTAGE (1.8V to 6V) HIGH OUTPUT POWER (30mW/32/3V) 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 conBLOCK DIAGRAM
DIP20 SO20 ORDERING NUMBERS: TDA7285 TDA7285D
trol, headphone driver and motor speed controller.
May 1997
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PIN CONNECTION (Top view)
ABSOLUTE MAXIMUM RATINGS
Symbol VS IOmax Im max Ptot Top Tstg, Tj Supply Voltage Maximum Output Current Maximum Motor Current Total Power Dissipation Tamb = 90C Operating Temperature Storage and Junction Temperature Parameter Value 8 70 700 0.9 -20 to +70 -40 to 150 Unit V mA mA W C C
THERMAL DATA
Symbol Rth j-amb Description Thermal Resistance Junction-ambient SO20 150 DIP20 100 Unit C/W
DC CHARACTERISTICS (Tamb = 25C; VS = 3V; RL = 32 (Headphone) and RL = 10K (Preamplifier); Vi = 0; VOL. Control = Vref).
Terminal No Term. Volt. (V) 1 0 2 3 4 5 6 7 8 0 9 2.8 10 0 11 1.6 12 3 13 3 14 15 16 17 18 19 20 1.5 1.5 1.5 1.5 2.7 1.4 1.4 1.5 1.5 1.5 1.5 1.5 1.5
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ELECTRICAL CHARACTERISTICS (VS = 3V; RL = 32, Vol. Control = 2/3 Vref (pin 20); Tamb = 25C; f = 1KHz; unless otherwise specified
Symbol VS Id Parameter Supply Range Total Quiescent Drain Current Test Condition Min. 1.8 15 Typ. Max. 6 22 Unit V mA
PLAYBACK AMPLIFIER
Gvo Gv VO THD Ib Ct en SVR1 Open Loop Gain Close Loop Gain Output Voltage Total Harmonic Distortion Bias Current Cross Talk Total Input Noise Ripple Rejection RS = 2.2K; VO = 330mVrms RS = 2.2K; B = 22Hz to 22KHz RS = 2.2K; Vr = 100mVrms f = 100Hz; CSVR = 100F THD = 1% VO = 330mVrms 600 70 33 750 0.05 3 74 1.2 50 0.25 dB dB mV % A dB V dB
HEADPHONE DRIVER
VDC PO PO1 GV THD Ct SVR2 Output DC Voltage Output Power Transient Output Power Close Loop Gain Volume Control range Total Harmonic Distortion Cross Talk Ripple Rejection THD = 10% THD = 10% RL = 16 PO = 5mW 66 PO = 5mW PO = 5mW; RS = 10K RS = 600; Vr = 100mV f = 100Hz; CSVR = 100F 20 1.4 30 50 31 75 0.3 50 47 1 V mW mW dB dB % dB dB
MOTOR SPEED CONTROL
Vref K Vsat Vref VS Vref K VS K Vref Im Vref K Im K Vref Tamb Vref K Tamb K Motor Reference Voltage (pin 12) Shunt Ratio Residual Voltage Line Regulation Voltage Characteristics of Shunt Ratio Load Regulation Current Characteristics of Shunt Ratio Temperature Characteristics of Reference Voltage Temperature Characteristics of Shunt Ratio Im = 100mA Im = 100mA Im = 100mA; VS = 1.8 to 6V Im = 100mA; VS = 1.8 to 6V Im = 30 to 200mA Im = 30 to 200mA Im = 100mA Tamb = -20 to +60C Im = 100mA Tamb = -20 to +60C 0.18 45 0.20 50 0.13 0.20 0.80 0.015 0.03 0.04 0.02 0.22 55 0.30 0.8 3 0.08 0.1 V V %/V %/V %/mA %/mA %/C %/C
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Figure 1: Test and Application Circuit
Figure 2: P.C. Board and Component Layout of the Circuit of Figure 2 (1:1 scale)
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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 = 10K
Figure 7: Supply Voltage Rejection vs. Frequency (PREAMPLIFIER)
Figure 8: Quiescent Output Voltage vs. Supply Voltage (DRIVER)
VS = 3V RS = 2.2K VR = 100mVrms CSVR = 100F
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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 = 50K; RL = 32; f = 1KHz) (DRIVER)
VS = 3V RS = 600 VR = 100mVrms CSVR = 100F
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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)
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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.
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 (4.7F typ.) and C14 (1F typ.) depend on the type of motor used. C15 adjusts WOW and flutter of the system. C14 suppresses motor spikes.
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TDA7285
SO20 PACKAGE MECHANICAL DATA
DIM. MIN. A a1 a2 b b1 C c1 D E e e3 F L M S 7.4 0.5 12.6 10 1.27 11.43 7.6 1.27 0.75 8 (max.) 0.291 0.020 13.0 10.65 0.35 0.23 0.5 45 (typ.) 0.496 0.394 0.050 0.450 0.299 0.050 0.030 0.512 0.419 0.1 mm TYP. MAX. 2.65 0.3 2.45 0.49 0.32 0.014 0.009 0.020 0.004 MIN. inch TYP. MAX. 0.104 0.012 0.096 0.019 0.013
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DIP20 PACKAGE MECHANICAL DATA
DIM. MIN. a1 B b b1 D E e e3 F I L Z 3.3 1.34 8.5 2.54 22.86 7.1 3.93 0.130 0.053 0.254 1.39 0.45 0.25 25.4 0.335 0.100 0.900 0.280 0.155 1.65 mm TYP. MAX. MIN. 0.010 0.055 0.018 0.010 1.000 0.065 inch TYP. MAX.
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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. 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. (c) 1997 SGS-THOMSON Microelectronics - Printed in Italy - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
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