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TDA7403DTR

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25
Softstep Volume
When volume level is changed often an audible
click appears at the output. The root cause of
those clicks could be either a DC offset before
the volume stage or the sudden change of the
envelope of the audio signal. With the Softstep
feature both kinds of clicks could be reduced to a
minimum and are no more audible (see figure 3).
Bass
There are three parameters programmable in the
bass stage (see figs 4, 5, 6, 7):
- Attenuation
- Center Frequency (60, 70, 80 and 100Hz)
- Quality Factors (1, 1.25, 1.5 and 2)
DC Mode
In this mode the DC gain is increased by 4.4dB.
In addition the programmed center frequency and
quality factor is decreased by 25% which can be
used to reach alternative center frequencies or
quality factors.
Treble
There are two parameters programmable in the
treble stage (see figs 8, 9):
- Attenuation
- Center Frequency (10, 12.5, 15 and 17.5kHz).
Speaker Attenuator
Due to practical aspects the steps in the speaker
attenuators are not linear over the full range. At
attenuations more than 24dB the steps increase
from 1.5dB to 10dB (please see data byte specifi-
cation).
TDA7403
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Obsolete Product(s) - Obsolete Product(s)
0.0
2.5
5.0
7.5
10.0
12.5
15.0
10.0 100.0 1.0K 10.0K
Figure 7. Bass normal and DC Mode
@ Gain = 14dB, fc = 80Hz
0.0
2.5
5.0
7.5
10.0
12.5
15.0
10.0 100.0 1.0K 10. 0K
Figure 6. Bass Quality factors @ Gain = 14dB,
fc = 80Hz
0.0
2.5
5.0
7.5
10.0
12.5
15.0
10.0 100.0 1.0K 10.0K
Figure 5. Bass Center @ Gain = 14dB, Q = 1
-15.0
-10.0
-5.0
0.0
5.0
10.0
15.0
10.0 100.0 1.0K 10.0K
Figure 4. Bass Control @ fc = 80Hz, Q = 1
0.0
2.5
5.0
7.5
10.0
12.5
15.0
10.0 100.0 1. 0K 10.0K
Figure 9. Treble Center Frequencies
@ Gain = 14dB
-15.0
-10.0
-5.0
0. 0
5. 0
10.0
15.0
10. 0 100.0 1.0K 10. 0K
Figure 8. Treble Control @ fc = 17.5KHz
Note: In general the center frequency, Q and DC-mode can be set
independently. The exception from this rule is the mode (5/xx1111xx)
where the center frequency is set to 150Hz instead of 100Hz.
TDA7403
8/25
Obsolete Product(s) - Obsolete Product(s)
ELECTRICAL CHARACTERISTICS (V
S
= 9V; deemphasis time constant = 50µs, V
MPX
= 500mV,
75KHz deviation, f = 1KHz. G
I
= 6dB, T
amb
= 25°C; unless otherwise specified).
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
IN
MPX Input Level Input Gain = 3.5dB 0.5 1.25 V
RMS
R
in
Input Resistance 100 K
Ω
G
min
Minimum Input Gain 3.5 dB
G
max
Max Input Gain 11 dB
G
STEP
Step Resolution 2.5 dB
SVRR Supply Voltage Ripple Rejection V
ripple
= 100mv, f = 1khz 60 dB
α
Max Channel Separation 50 dB
THD Total Harmonic Distortion 0.05 %
S
+
N
N
Signal plus Noise to Noise Ratio S = 2V
rms
86 dB
MONO/STEREO SWITCH
V
PTHST1
Pilot Threshold Voltage for Stereo, PTH = 1 15 mV
V
PTHST0
Pilot Threshold Voltage for Stereo, PTH = 0 25 mV
V
PTHMO1
Pilot Threshold Voltage for Mono, PTH = 1 12 mV
V
PTHMO0
Pilot Threshold Voltage for Stereo, PTH = 0 19 mV
PLL
∆
f/f Capture Range 0.5 %
DEEMPHASIS and HIGHCUT
τ
HC50
Deemphasis Time Constant Bit = 7, Subadr. 10 = 0
V
LEVEL
>> V
HCH
50
µ
s
τ
HC75
Deemphasis Time Constant Bit = 7, Subadr. 10 = 1
VLEVEL >> V
HCH
75
µ
s
τ
HC50
Highcut Time Constant Bit = 7, Subadr. 10 = 0
VLEVEL >> V
HCL
150
µ
s
τ
HC75
Highcut Time Constant Bit = 7, Subadr. 10 = 1
VLEVEL >> V
HCL
225
µ
s
STEREOBLEND and HIGHCUT-CONTROL
REF5V Internal Reference Voltage 5 V
TC
REF5V
Temperature Coefficient 3300 ppm
L
Gmin
Min. LEVEL Gain 0 dB
L
Gmax
Max. LEVEL Gain 10 dB
L
Gstep
LEVEL Gain Step Resolution 0.67 dB
VSBL
min
Min.Voltage for Mono 33 %REF5V
VSBL
max
Max. Voltage for Mono 58 %REF5V
VSBL
step
Step Resolution 8.4 %REF5V
STEREODECODER PART
No external components necessary
PLL with adjustment free fully integrated VCO
Automatic pilot dependent MONO/STEREO
switching
Very high suppression of intermodulation and
interference
Programmable Roll-Off compensation
Dedicated RDS Softmute
Highcut and Stereoblend characterisctics pro-
grammable in a wide range
Internal Noiseblanker with threshold controls
Multipath detector with programmable inter-
nal/external influence
I
2
C bus control of all necessary functions
TDA7403
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Obsolete Product(s) - Obsolete Product(s)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25

TDA7403DTR

Mfr. #:
Buy TDA7403DTR
Manufacturer:
STMicroelectronics
Description:
Audio DSPs Basic Signal Process
Lifecycle:
New from this manufacturer.
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