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TDA7285-TDA7285D
STEREO CASSETTE PLAYER AND MOTOR SPEED CONTROLLER
TDA7285STEREO 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 PREAMPLIFI-
ERS
LOW MOTOR REFERENCE VOLTAGE
(200mV)
DESCRIPTIONThe TDA7285 is a monolithic integrated circuit
designed for the portable players market and as-
sembled in a plastic DIP20 and SO20. The inter-
nal functions are: preamplifier, DC volume con-
trol, headphone driver and motor speed control-
ler.
BLOCK DIAGRAM
PIN CONNECTION (Top view)
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
DC CHARACTERISTICS (Tamb = 25°C; VS = 3V; RL = 32Ω (Headphone) and RL = 10KΩ (Preamplifier);Vi = 0; VOL. Control = Vref).
TDA7285
ELECTRICAL CHARACTERISTICS (VS = 3V; RL = 32Ω, Vol. Control = 2/3 Vref (pin 20); Tamb = 25°C; f =1KHz; unless otherwise specified
PLAYBACK AMPLIFIER
HEADPHONE DRIVER
MOTOR SPEED CONTROL
TDA7285
Figure 1: Test and Application Circuit
Figure 2: P.C. Board and Component Layout of the Circuit of Figure 2 (1:1 scale)
TDA7285
Figure 3: Quiescent Drain Current vs. SupplyVoltage
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)
Figure 7: Supply Voltage Rejection vs.Frequency (PREAMPLIFIER)
Figure 8: Quiescent Output Voltage vs. SupplyVoltage (DRIVER)
TDA7285
