TDA7416 Fast Delivery |IC PHOENIX CO.,LIMITED

TDA7416 ,CARRADIO SIGNAL PROCESSORFEATURESInput multiplexer– 1 pseudo differential CDC stereo input, programmable as single-ended inp ..
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TDA7416
CARRADIO SIGNAL PROCESSOR
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TDA7416
September 2003 3 STEREO INPUTS 1 PSEUDO DIFFERENTIAL STEREO INPUT VOLUME CONTROL 7 BAND EQUALIZER FILTER CONTROL HIGH PASS FILTER FOR SUBWOOFER
APPLICATION DIRECT MUTE AND SOFT MUTE 4 INDEPENDENT SPEAKER OUTPUTS SOFT STEP SPEAKER CONTROL SUBWOOFER OUTPUT WITH SOFT STEP 7 BAND SPECTRUM ANALYZER FULL MIXING CAPABILITY HPF2 WITH ZEROCROSSI2 C-BUS INTERFACE
DESCRIPTION
The device includes a high performance audiopro-
cessor with 7 bands equalizer and spectrum ana-
lyzer. The digital control allows a programming in
a wide range of all the filter characteristics.
CARRADIO SIGNAL PROCESSOR
PIN CONNECTION (Top view)
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SUPPLY
THERMAL DATA
ABSOLUTE MAXIMUM RATINGS
ESD:
All pins are protected against ESD according to the MIL883 standard.
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BLOCK DIAGRAM
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FEATURES
Input multiplexer 1 pseudo differential CDC stereo input, programmable as single-ended input 3 single-ended stereo inputs Input gain adjust 0 to 15dB with 1dB steps direct mute internal offset-cancellation (autozero)
Mixing stage mixable mix input to Front speaker outputs Input controls +15 to -79dB with 1dB steps direct mute
Loudness programmable center frequency and filter slope 19dB with 1dB steps selectable flat-mode (constant attenuation)
Volume +32 to -79.5dB with 0.5dB step resolution soft-step control with programmable blend times 100dB range
Equalizer seven bands 2nd order frequency response center frequency programmable for lowest and highest filter programmable quality factor in four steps for each filter -15 to 15dB range with 1dB resolution
Spectrum analyzer seven bandpass filters 2nd order frequency response programmable quality factor for different visual appearance analog output controlled by external serial clock
High pass 2nd order butterworth highpass with programmable cut-off frequency selectable flat-mode
Speaker 4 independent soft step speaker controls, +15 to -79dB with 1dB steps
–mute 4 independent programmable mix inputs with 50% mixing ratio
Subwoofer single-ended monaural output independent soft step level control +15 to -79dB with 1dB steps
Mute functions direct mute digitally controlled SoftMute with 3 programmable mute-times
Effect Gain effect or high pass effect fixed external components
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Table 1. ELECTRICAL CHARACTERISTICS
(VS=9V; Tamb=25°C; RL=10kΩ; all gains=0dB; f=1kHz; unless otherwise specified)
INPUT SELECTOR
DIFFERENTIAL STEREO INPUTS
MIXING CONTROL
LOUDNESS CONTROL
VOLUME CONTROL
SOFT MUTE
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EQUALIZER CONTROL
SPECTRUM ANALYZER CONTROL
Table 1. ELECTRICAL CHARACTERISTICS (continued)
(VS=9V; Tamb=25°C; RL=10kΩ; all gains=0dB; f=1kHz; unless otherwise specified)
1) The SM-Pin is active low (Mute = 0)
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TDA7416
HPF2
SPEAKER ATTENUATORS
AUDIO OUTPUTS
HIGH PASS
SUBWOOFER ATTENUATOR
SUBWOOFER Lowpass
Table 1. ELECTRICAL CHARACTERISTICS (continued)
(VS=9V; Tamb=25°C; RL=10kΩ; all gains=0dB; f=1kHz; unless otherwise specified)
TDA7416
8/27 DESCRIPTION OF THE AUDIOPROCESSOR PART
1.1 Input stages
In the basic configuration one pseudo-differential, three single ended stereo are available.
Figure 1. Input-stages
GENERAL
Table 1. ELECTRICAL CHARACTERISTICS (continued)
(VS=9V; Tamb=25°C; RL=10kΩ; all gains=0dB; f=1kHz; unless otherwise specified)
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1.1.1 Pseudo-differential stereo Input (IN1)
The IN1-input is implemented as a buffered pseudo-differential stereo stage with 100kΩ input-impedance
at each input pin. This input is also configurable as single-ended stereo input . The common input-pin, IN1-
features a fast charge switch to speed up the charge time of external capacitors.- This switch is released
the first time the input-selector data-byte (0) is assessed.
1.1.2 Single-ended stereo Inputs
All single ended inputs have an input impedance of 100kΩ.
1.2 AutoZero
The AutoZero allows a reduction of the number of pins as well as external components by canceling any
offset generated by or before the In-Gain-stage (Please notice that externally generated offsets, e.g. gen-
erated through the leakage current of the coupling capacitors, are not canceled).
The auto-zeroing is started every time the DATA-BYTE 0 is selected and needs max. 0.3ms for the align-
ment. To avoid audible clicks the Audioprocessor have to be muted by softmute or hard mute during this
time.
1.2.1 AutoZero-Remain
In some cases, for example if the μP is executing a refresh cycle of the IIC-Bus-programming, it is not
useful to start a new AutoZero-action because no new source is selected and an undesired mute would
appear at the out-puts. For such applications the TDA7416 could be switched in the AutoZero-Remain-
Mode (Bit 6(I1) of the subad-dress-byte). If this bit is set to high, the DATABYTE 0 could be loaded without
invoking the AutoZero and the old adjustment-value remains.
1.3 Loudness
There are four parameters programmable in the loudness stage:
1.3.1 Attenuation
Figure 2 shows the attenuation as a function of frequency at fP = 400Hz
Figure 2. Loudness Attenuation @ fP = 400Hz.
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1.3.2 Peak Frequency
Figure 3 shows the four possible peak-frequencies at 200, 400, 600 and 800Hz
Figure 3. Loudness Center frequencies @ Attn. = 15dB
1.3.3 Loudness filter order
Different shapes of 1st and 2nd-Order Loudness
Figure 4. 1st and 2nd Order Loudness @ Attn. = 15dB, fP=400Hz
1.3.4 Flat Mode
In flat mode the loudness stage works as a 0dB to -19dB attenuator.
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1.4 SoftMute
The digitally controlled SoftMute stage allows muting/demuting the signal with a I2 C-bus programmable
slope. The mute process can either be activated by the SoftMute pin or by the I2 C-bus. This slope is real-
ized in a special S-shaped curve to mute slow in the critical regions (see Figure 5).
For timing purposes the Bit0 of the I2 C-bus output register is set to 1 from the start of muting until the end
of de-muting.
Figure 5. Soft Mute-Timing
Note: Please notice that a started Mute-action is always terminated and could not be interrupted by a change of the mute -signal.
1.5 SoftStep Volume and Speaker
When the speaker-level is changed audible clicks could appear at the output. The root cause of those
clicks could either be a DC-Offset before the speaker-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. The blend-time from one step to the next is programmable in four steps.
Figure 6. SoftStep-Timing for Volume
Note: For steps more than 0.5dB (Volume) or 1dB (Speaker) the SoftStep mode should be deactivated because it could generate a hard 1dB
step during blending.
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1.6 Equalizer filter
There are three parameters programmable in the equalizer filter:
1.6.1 Attenuation
Figure 7 shows the boost and cut response as a function of frequency at a center frequency of 1kHz.
Figure 7. Equalizer filter control @ fCenter = 1kHz, Q = 1.0
1.6.2 Center Frequency
This parameter is programmable in the filter stage 1(62/100Hz), 6(4/6.34kHz) and 7(15/16kHz) only.
Figure 8 shows the center frequencies 62, 156, 396, 1000, 2510, 6340 and 15000Hz of the 7 equalizer
filters.
Figure 8. Center frequencies @ Gain = 15dB, Q = 1.0
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1.6.3 Quality Factors
Figure 9 shows the four possible quality factors 1, 1.4, 1.8 and 2.2
Figure 9. Quality factors @ boost = 15dB, fCenter = 1kHz
1.6.4 Superposition of all EQ Filters
Figure 10 shows the superposition of all equalizer filter curves for different quality factors. The gain for all
filters is +15dB.
Figure 10. Superposition of all EQ bands @ boost = 15dB
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1.6.5 DC-mode of equalizer band 1 (62/100 Hz)
In this mode, the DC-gain 4dB when set to 15dB boost.
Figure 11. EQ band1, normal- and DC-mode @ boost = 15 dB, fCenter = 62 Hz
Note: The center frequency, Q, DC-mode and boost/cut can be set fully independently for each filter.
1.7 Subwoofer Application
Figure 12. Subwoofer Application with Lowpass @ 80/120/160Hz and HighPass @ 90/135/180Hz
Both filters, the lowpass- as well as the highpass-filter, have butterworth characteristic so that their cut-off
frequen-cies are not equal but shifted by the factor 1.125 to get a flat frequency response.

Partno	Mfg	Dc	Qty	Available	Descript
TDA7416	ST	N/a	201	avai	CARRADIO SIGNAL PROCESSOR