E-TDA7437N STMicroelectronics, E-TDA7437N Datasheet - Page 24

• Manufacturer Part Number: E-TDA7437N
• Description: Multimedia Misc CNTRL audio PROCESSR
• Manufacturer: STMicroelectronics
• Type: Audio Processorr

Specifications of E-TDA7437N

• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: TQFP-44
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Mute and pause features
5.6
5.7
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When the incoming signal is detected to be outside the selected window, the external
capacitor is discharged. When the signal is inside the window, the capacitor is integrating up
(see
The pull up current is 25uV typical, with input signal
Vin = 1Vrm --; Vdc pin pause = 15mV
Vin = 0Vrms --; Vdc pin pause = 5.62V
For example choosing Cpause = 100nF the charge up constant is about 22ms. Instead with
Cpause = 15nF the charge up constant is about 360μs.
The pause detection is useful in applications like RDS, to perform noiseless tuning
frequency jumps, avoiding the use of the mute.
No symmetrical bass cut response
bit D7 = 0 No symmetrical
bit D7 = 1 Symmetrical
The bass stage has the option to generate an unsymmetrical response, for cut mode
settings (bass level from -2db to - 14dB)
For example using a T-type band pass external
The feature is useful for human ear equalization in a noisy environment, like a car.
See examples in
response).
Transmitted data (send mode)
bitP = 0Pause active
bitP = 1No pause detected
bitZM = 1Zero cross mute ON
bitZM = 0Zero cross mute OFF
bitSM = 1Soft mute ON
bitSM = 0Soft mute OFF
bitST = 1Stereo signal detected (input MPX)
bitST = 0Mono signal detected (input MPX)
The TDA7437N allows the reading of four info bits.
a)
b)
Figure 15
by reading directly the Pause pin level.The ON/OFF voltage threshold is 3.0V
typical. Pause OFF = level low (< 3.0V) Pause ON = level high ( ; 3.0V)
by reading via I2C bus the transmitted byte, bit PP = 0 pause active. P = 1 no
pause detected. The external capacitor value fixes the time constant.
and
Figure 17
Figure
16).
(symmetrical response) and
Figure 18
(unsymmetrical
TDA7437N