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PDF TDA7420 Data sheet ( Hoja de datos )
| Número de pieza | TDA7420 | |
| Descripción | MULTIFUNCTIONAUDIO PROCESSOR | |
| Fabricantes | ST Microelectronics | |
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® TDA7420
MULTIFUNCTION AUDIO PROCESSOR
CASSETTE PREAMPLIFIER:
FORWARD/REVERSE INPUTS GROUND
COMPATIBLE
INTERNAL SWITCHES FOR EQUALIZATION
INTERNAL ADJUSTMENT FOR TRAKING
INTERNAL ADJUSTMENT FOR OUTPUT
AMS:
INPUT GAIN CONTROL
ADJUSTABLE GAIN VERSUS FREQUENCY
AUDIOPROCESSOR:
INPUTS: 1 FULLY DIFFERENTIAL, 1 DIFFER-
ENTIAL, 1 STEREO AND 1 MONO
INPUT GAIN FROM 0 TO 15dB (1dB STEP)
VOLUME CONTROL FROM +16 TO -63dB
(1dB STEP)
BASS AND TREBLE CONTROL FROM -18
TO 18dB (1dB STEP)
DIRECT MUTE, SOFT MUTE AND RADIO
MUTE
FOUR INDEPENDENT OUTPUT STAGES:
- ATTENUATION CONTROL FROM
0 TO -79dB (1dB STEP)
- BEEP CONTROL (ON/OFF, FRONT/REAR)
STEREO DECODER:
ROLL-OFF ADJUSTMENT
SELECTABLE DEEMPHASIS
19KHz CANCELLATION
HIGH CUT CONTROL
STEREO BLEND
NOISE BLANKER
AUTOMATIC THRESHOLD CONTROL AND
PROGRAMMABLE TRIGGER THRESHOLD
INTEGRATED HIGH PASS FILTER
PACKAGE: TQFP64 (14x14)
TQFP 64 (14x14)
ORDERING NUMBER: TDA7420
DESCRIPTION
The TDA7420 I2C bus controlled multifunction
audio processor contains all signal processing
blocks of a high performance car radio, including
audioprocessor, stereodecoder, noise blanker,
different mute functions, cassette preamplifier and
AMS function.
The use of BICMOS technology allows the imple-
mentation of several filter functions with switched
capacitor techniques like fully integrated, adjust-
ment free PLL Loop filter, pilot detector with inte-
grator.
This minimizes the number of external compo-
nents.
Due to a highly linear signal processing, using
CMOS-switching techniques instead of standard
bipolar multipliers, very low distortion and very
low noise are obtained also in the stereodecoder
part.
Very low DC stepping is obtained by use of the
BICMOS technology.
May 1998
1/29
1 page  
TDA7420
ELECTRICAL CHARACTERISTICS (continued.)
Symbol
Parameter
TREBLE CONTROL
CRANGE Control Range
ASTEP
Step Resolution
RT Internal Feedback Resistance
SPEAKER ATTENUATORS
CRANGE Control Range
ASTEP
Step Resolution
AMUTE Output Mute Attenuation
EA Attenuation Set Error
VDC DC Step
AUDIO OUTPUTS
VCLIP
Clipping Level
RL
ROUT
Output Load Resistance
Output Impedance
VDC DC Voltage Level
GENERAL
ENO Output Noise
S/N Signal to Noise Ratio
d Distortion
SC Channel Separation Left/Right
ET Total Tracking Error
BUS INPUT
VIL Input Low Voltage
VIH Input High Voltage
IIN Input Current
VO Output Voltage SDA
Acknowledge
SUPPLY
VIL
IS
Supply Voltage
Supply Current
SVR
Ripple Rejection
Cref = 22µF
Test Condition
Min.
+17
0.5
37
AV = 0 to -40dB
AV = 0 to -40dB
Adjacent Attenuation Steps
d = 0.3%
BW = 20Hz to 20KHz, flat
Output Muted
All gains = 0dB
All gains 0dB; VO = 1VRMS ;
VI = 1VRMS ;
AV = 0 to -20dB;
AV = -20 to -40dB;
0.5
80
2.0
2
100
3.35
80
VIN = 0.4V
IO = 1.6mA
3
-5
Stereo Decoder = ON
Stereo Decoder = OFF
Audioprocessor
Stereo Decoder + Audioprocessor
6.5
25
20
Typ.
+18
1
50
79
1
100
0.1
2.5
200
3.6
4.0
5.0
106
0.01
95
0
0
0.1
8.5
33
28
80
60
Max. Unit
+19 dB
1.5 dB
63 KΩ
1.5
1.50
3
dB
dB
dB
dB
mV
300
3.85
VRMS
KΩ
Ω
V
15
0.08
1
2
µV
µV
dB
%
dB
dB
dB
1V
V
5 µA
0.4 V
10.0
41
35
V
mA
mA
dB
dB
5/29
5 Page 
Figure 1: Block Diagram of the Noise Blanker
TDA7420
MPX IN
VR
VSB
80KHz LP
1
I2C-BUS
SIGNAL PATH
LEFT
RIGHT
to INPUT SELECTOR
of AUDIOPROC.
AMP
BUF
RECT
AUTOMATIC
PEAK
THRESHOLD
CONTROL
BLANK COMP
PEAK COMP
REF.
+
-
ATC PEAK+VTH
40µs
CMOS OUTPUT
STAGE
TRIGGER
OUT
40µs
RECT-PEAK
5
4
ADDITIONAL THRESHOLD
CONTROL
(ATC-SB, MPX_RECT)
D94AU189A
RPEAK
82KΩ
CPEAK
47nF
CBLANK
330pF
Figure 2: Trigger Threshold vs. Vpeak
VTH
8 STEPS
TRIG. THRESHOLD
65mV
30mV
0.9V
D94AU186B
280mV
240mV
180mV
140mV
NOISE ADJUSTED
TRIG. THRESHOLD
1.4V
VPEAK(V)
11/29
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet TDA7420.PDF ] | |
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