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Número de pieza | TDA7312 | |
Descripción | DIGITAL CONTROLLED STEREO AUDIO PROCESSOR | |
Fabricantes | ST Microelectronics | |
Logotipo | ||
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DIGITAL CONTROLLED STEREO AUDIO PROCESSOR
INPUT MULTIPLEXER:
- 4 STEREO INPUTS
FOUR SELECTABLE ADDRESSES
TWO DIGITAL CONTROL OUTPUTS
INPUT AND OUTPUT FOR EXTERNAL
EQUALIZER OR NOISE REDUCTION SYS-
TEM
VOLUME CONTROL IN 1.25dB STEPS
TREBLE AND BASS CONTROL
TWO SPEAKER ATTENUATORS:
- INDEPENDENT SPEAKERS CONTROL
IN 1.25dB STEPS
- INDEPENDENT MUTE FUNCTION
ALL FUNCTIONS PROGRAMMABLE VIA SE-
RIAL I2C BUS
DESCRIPTION
The TDA7312 is a volume, tone (bass and treble)
balance (Left/Right) processor for quality audio appli-
cations.
SDIP30
ORDERING NUMBER: TDA7312
Control is accomplished by serial I2C bus microproc-
essor interface.
The AC signal setting is obtained by resistor networks
andswitches combined with operationalamplifiers.
Thanks to the used BIPOLAR/CMOS Tecnology,
Low Distortion, Low Noise and Low DC stepping are
obtained.
PIN CONNECTION (Top view)
November 1999
1/13
1 page TDA7312
ELECTRICAL CHARACTERISTICS (continued)
Symbol
AUDIO OUTPUTS
Parameter
Test Condition
Min. Typ. Max. Unit
VOCL
RL
CL
ROUT
VOUT
GENERAL
Clipping Level
Output Load Resistance
Output Load Capacitance
Output resistance
DC Voltage Level
d = 0.3%
2 2.5
Vrms
2 KΩ
10 nF
30 75 120 Ω
4.2 4.5 4.8
V
eNO Output Noise
S/N Signal to Noise Ratio
d Distortion
Sc Channel Separation left/right
Total Tracking error
BUS INPUTS
BW = 20-20KHz, flat
output muted
all gains = 0dB
A curve all gains = 0dB
all gains = 0dB; VO = 1Vrms
AV = 0, VIN = 1Vrms
AV = -20dB VIN = 1Vrms
VIN = 0.3Vrms
AV = 0 to -20dB
-20 to -60 dB
2.5 µV
5 15 µV
3 µV
106 dB
0.01
0.09
0.04
0.1
0.3
%
%
%
80 103
dB
0 1 dB
0 2 dB
VIL Input Low Voltage
VIH Input High Voltage
IIN Input Current
VO Output Voltage SDA Acknowledge IO = 1.6mA
ADDRESS PIN (Internal 50KΩ pull down resistor).
1V
3V
-5 +5 µA
0.4 V
Notes:
SDA, SCL, DIG OUT 1, DIG OUT 2 Pins are high impedance when VS = 0
(1) Bass and Treble response see attached diagram (fig.16). The center frequency and quality of the resonance behaviour can be choosen by
the external circuitry. A standard first order bass response can be realized by a standard feedback network
(2) The selected input is grounded thru the 2.2µF capacitor.
Figure 1: Noise vs. Volume/Gain Settings
Figure 2: Signal to Noise Ratio vs. Volume
Setting
5/13
5 Page Audio Switch
MSB
0
1
TDA7312
LSB FUNCTION
0 D2 D1 S2 S1 S0 Audio Switch
1 0 0 Stereo 1
1 0 1 Stereo 2
1 1 0 Stereo 3
1 1 1 Stereo 4
0
1
0
1
DIG. OUT 1 = 0
DIG. OUT 1 = 1
DIG. OUT 2 = 0
DIG. OUT 2 = 1
Bass and Treble
0 1 1 0 C3 C2
0 1 1 1 C3 C2
00
00
00
00
01
01
01
01
11
11
11
11
10
10
10
10
C3 = Sign
For example Bass at -10dB is obtained by the following 8 bit string:
01100010
C1
C1
0
0
1
1
0
0
1
1
1
1
0
0
1
1
0
0
C0 Bass
C0 Treble
0 -14
1 -12
0 -10
1 -8
0 -6
1 -4
0 -2
10
10
02
14
06
18
0 10
1 12
0 14
Status at Power on Reset
Volume = 78.75dB
Treble = Bass = +2dB
Spkrs Attenuators = Mute
Input = Stereo 1
Dig. OUT 1 = Dig. OUT 2 = 1
11/13
11 Page |
Páginas | Total 13 Páginas | |
PDF Descargar | [ Datasheet TDA7312.PDF ] |
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