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TDA7300-TDA7300D
DIGITAL CONTROLLED STEREO AUDIO PROCESSOR
TDA7300DIGITAL CONTROLLED STEREO AUDIO PROCESSOR
SINGLE SUPPLY OPERATION
FOUR STEREO INPUT SOURCE SELEC-
TION
MONO INPUT
TREBLE, BASS, VOLUME, AND BALANCE
CONTROL
FOUR INDEPENDENT SPEAKER CONTROL
(FRONT/REAR)
SINGLE SUPPLY OPERATION
ALL FUNCTIONS PROGRAMMABLE VIA SE-
RIAL BUS
VERY LOW NOISE AND VERY LOW DIS-
TORTION
POP FREE SWITCHING
DESCRIPTIONThe TDA7300isa volume, tone (bass and treble),
balance (left/right) and fader (front/rear) proces-
sor for high quality audio applicationsin car radio
and Hi-Fi systems.
Controlis accomplishedby serial bus microproc-
essor interface.
The AC signal settingis obtainedby resistor net-
works and analog switches combined with opera-
tional amplifiers.
The results are: low noise, low distortion and high
dynamic range.
BLOCK DIAGRAM
DIP28 SO28
ORDERING NUMBERS:TDA7300 TDA7300D
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit Supply Voltage (VS1)18 V
Tamb Operating Ambient Temperature Range -40to +85 °C
Tstg Storage Temperature -40to 150 °C
THERMAL DATA
Symbol Description SO28 DIP28 UnitRth j-pins Thermal Resistance Junction-pins Max 85 65 °C/W
ELECTRICAL CHARACTERISTICS (Tamb =25°C, VS1= 12Vor VS2= 8.5V,RL= 10kΩ andRg= 600Ω ,= 1KHz unless otherwise specified)
Symbol Parameter Test Condition Min. Typ. Max. UnitSUPPLY (1)
VS1 Supply Voltage VS1 10 12 16 V
VS2 Supply Voltage VS2 6 8.5 10 V
IS2 Supply Current 15 30 40 mA
Vref Reference Voltage (pin7) 3.5 4.3 5 V
SVR Ripple Rejectionat VS1 f= 300Hzto 10KHz 80 97 dB
SVR Ripple Rejectionat VS2 f= 300Hzto 10KHz 50 58 dB
INPUT SELECTORS Input Resistance 30 45 KΩ
VINmax Max. Input Signal GV= 0dB d= 0.3% 1.5 2.2 Vrms
INS Input Separation f= 1KHz (2) 90 100 dB= 10KHz (2) 70 80 dB
PIN CONNECTION (Top view)
TDA7300
ELECTRICAL CHARACTERISTICS (continued)
Symbol Parameter Test Condition Min. Typ. Max. UnitVOLUME CONTROLS
Control Range 78 dB
Gmax Max Gain 8 10 12 dB
Max Attenuation 64 68 dB
Step Resolution GV= -50to 10dB 2 3 dB
Attenuator Set Error 2 dB
Tracking Error 2dB
SPEAKER ATTENUATORS
Control Range 35 38 41 dB
Step Resolution 2 3 dB
Attenuator Set Error 2 dB
Tracking Error 2dB
BASS AND TREBLE CONTROL (3)
Control Range ±15 dB
Step Resolution 2.5 3.5 dB
AUDIO OUTPUT Max. Output Voltage d= 0.3% 1.5 2.2 Vrms Output Load Resistance 2 KΩ Output Load Capacitance 1 nF Output Resistance 70 150 Ω
VO(DC) DC Voltage Level 3 3.8 4.5 V
GENERAL
eNO Output Noise BW= 22Hzto 22KHz,Gv= 0dB 6 15 μV
CurveA Gv= 0dB 4
S/N Signalto Noise Ratio All gain= 0dB VO= 1Vrms= 22Hzto 22KHz
105 dB Distortion f= 1KHz; VO= 1V; Gv=0 0.01 0.1 %
Frequency Response (-1dB) Gv=0 High
Low
KHz Channnel Separation left/right f= 1KHz= 10KHz
BUS INPUTS
VIL Input LOW Voltage 0.8 V
VIH Input HIGH Voltage 2.4 V OutputVoltage SDA AcknowledgeI= 1.6mA 0.4 V
Digital Input Current -5 +5 μA
Notes:(1)The circuit canbe supplied eitheratVS1or withouttheuseofthe internal voltage regulator atVS2.The circuit also operatesata supply
voltage VS1lower than 10V. Inthis casethe ripple rejectionofVS2is valid, becausethe voltage regulator saturatestoa saturation voltage about 0.8V.
(2)The selected inputis groundedthruthe 2.2μF capacitor.
(3) Bassand Treble responsesee attacheddiagram. The center frequencyand qualityofthe resonance behaviourcanbe choosenbythe
external circuitry.A standardfirst order bass response can berealizedbya standard feedbacknetwork.
TDA7300
Figure1: Application Circuit
TDA7300
Figure2: P.C. Board and ComponentsLayoutof the Fig.1 (1:1 scale)
TDA7300
Figure3: Total Output Noise vs. Volume Setting
Figure5: Distortion+ Noise vs. Frequency
Figure7: Distortion vs. Load Resistance
Figure4: Signalto Noise Ratio vs. Volume
Setting
Figure6: Distortion vs. Output Voltage
Figure8: ChannelSeparation (L1- R1) vs.
Frequency
TDA7300
Figure9: Input Separation(L1- L2) vs. (VS1)
Frequency
Figure 10: Supply Voltage Rejection (VS1)vs.
Frequency
Figure 11: SupplyVoltage Rejection (VS2)vs.
Frequency
Figure 12: Supply Voltage Rejection vs. VS1
Figure 13: SupplyVoltage Rejection vs. VS2
Figure 14: Clipping Level (Vrms) vs. Supply
Voltage
TDA7300
APPLICATION INFORMATION
Volume Control ConceptTraditional electronic volume control circuits usea
multiplier technique withall the disadvantagesof
high noise and distortion.
The used concept,as shownin Fig.15 with digital
switched resistor dividers, provides extremely low
noise and distortion. The multiplexingof the resis-
tive dividersis realized witha multiple-input op-
erational amplifier.
Bass and Treble ControlThe principle operation of the bass controlis
shownin Fig. 16. The external filter together with
the internal buffer allowsa flexible filter design ac-
cordingto the different requirementsin car radios.
The functionof the trebleis similarto the bass. typical curveis shownin Fig.19.
Outputs special class-A output amplifier witha modu-
lated sink current provides low distortion and
ground compatibility with low current consump-
tion.
Figure 15: Volume Control
Figure 16: Bass Control
Figure 17: QuiescentCurrent vs. Supply Voltage
Figure 18: QuiescentCurrent vs. Temperature
TDA7300
