TDA7501TR ,LINE-DRIVER FOR DIGITAL CARRADIO SIGNAL PROCESSORTDA7501LINE-DRIVER FOR DIGITAL CARRADIOSIGNAL PROCESSOR (DSPLD)■ NPUTS:– QUASI DIFFERENTIAL STEREO ..
TDA7501TR ,LINE-DRIVER FOR DIGITAL CARRADIO SIGNAL PROCESSORABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Operating Supply Voltage V 10.5 VDDmax DDV Ope ..
TDA7502 ,IN-CAR REMOTE AMPLIFIER DSPTDA7502IN-CAR REMOTE AMPLIFIER DSP■ 24-Bit FIXED-POINT DSP CORE DELIVERING UP TO 50 MIPS■ 2 x 1024 ..
TDA7502013TR ,IN-CAR REMOTE AMPLIFIER DSPAbsolute Maximum RatingsSymbol Parameter Value UnitV DC Supply voltage -0.5 to 4.6 VddV Digital inp ..
TDA7505 , Car radio DSP for advanced signal processing
TDA7511 ,AM/FM TUNER FOR CAR RADIO HIFI APPLICATIONSBLOCK DIAGRAMLogic2/41AMIFin61 62 60 53 57 59 54 52 50 46 45 25 26 33 36 51 4956V VCC1 CC2 482I C B ..
THS4041CD ,165-MHz C-Stable Voltage-Feedback Amplifiermaximum ratings” may cause permanent damage to the device. These are stress ratings only andfunctio ..
THS4041CDGN , 165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
THS4041CDGNR ,165-MHz C-Stable Voltage-Feedback Amplifierblock diagramVCC8Null21IN−11OUT1321IN+8IN−6OUT36IN+2IN−72OUT52IN+Figure 2. THS4041 − Single Channel ..
THS4041CDR ,165-MHz C-Stable Voltage-Feedback Amplifier SLOS237B− MAY 1999 − REVISED FEBRUARY 2000THS ..
THS4041ID ,165-MHz C-Stable Voltage-Feedback Amplifiermaximum ratings over operating free-air temperature (unless otherwise noted)Supply voltage, V . . . ..
THS4041IDGN ,165-MHz C-Stable Voltage-Feedback Amplifierelectrical characteristics at T = 25°C, V = ±15 V, R = 150 Ω (unless otherwise noted)A CC Ldynamic ..
TDA7501TR
LINE-DRIVER FOR DIGITAL CARRADIO SIGNAL PROCESSOR
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TDA7501April 2004 NPUTS: QUASI DIFFERENTIAL STEREO INPUT
FOR CD DIFFERENTIAL STEREO INPUTS FOR
PHONE, NAVIGATION, FM, AM SINGLE-ENDED INPUT FOR CASSETTE-
FOUR INDEPENDENT INPUT MULTIPLEX-
ER AND GAIN STAGES ENVELOPE-DETECTOR FOR AM-NOISE-
BLANKING MIXING OF PHONE AND NAVIGATION DC-CONNECTION TO DSP DUAL MPX INPUTS OUTPUTS: 6 OUTPUT CHANNELS WITH INDEPEN-
DENT VOLUME CONTROL 4 MAIN OUTPUT CHANNELS WITH ADDI-
TIONAL INPUT SELECTOR FOR PHONE
AND/OR NAVIGATION OR CD OUTPUTS LEVEL UP TO 4V rms AC-CONNECTION FROM DSP DIGITAL CONTROL:
–SPI-BUS OR I2 C BUS INTERFACE (SE-
LECTABLE) DIRECT MUTE FOR THE OUTPUT STAG-
ES AND/OR HIGH IMPEDANCE MPX MUTE
DESCRIPTIONThe Linedriver handles all analog input- and out-
put-signals for the Digital Carradio Signal Proces-
sor TDA7501. The device contains four
independent input multiplexers to select the sourc-
es for the DSP's four AD-converters. Four addi-
tional gain stages allow an adaptation to run the
ADCs in best S/N condition.
The six outputs have independent volume stages
with a large dynamic range. Using a 12V-supply
the outputs are able to drive up to 4Vrms .
LINE-DRIVER FOR DIGITAL CARRADIO
SIGNAL PROCESSOR (DSPLD)
BLOCK DIAGRAM
TDA7501
SUPPLY
ABSOLUTE MAXIMUM RATINGS
ESD:All pins are protected against ESD according to the MIL883 standard.
PIN CONNECTION (Top view)
THERMAL DATA
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TDA7501
ELECTRICAL CHARACTERISTCS(VDD = VS = 8.3V; V33 = 3.3V Tamb = 25°C; RL = 10kΩ; all gains = 0dB; f = 1kHz; unless otherwise specified)
TDA7501
ELECTRICAL CHARACTERISTCS (continued)(VDD = VS = 8.3V; V33 = 3.3V Tamb = 25°C; RL = 10kΩ; all gains = 0dB; f = 1kHz; unless otherwise specified)
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TDA7501
DESCRIPTION OF THE INPUT PARTOn the input side, the TDA7501 (see figure 1) connects the external audio- and tuner-signals to the four
AD-converters of the Digital Carradio Signal Processor TDA7500. The audio signals are adjusted by the
input gain stage to the internal reference signal with 2V rms referred to 4.15V (=V33 ·1.2575). The follow-
ing CODEC-interface attenuates the 2VRMS to 0.8Vrms referred to the CODEC's reference voltage of
1.65V which allows a DC-coupling to the TDA7500.
Figure 1. Input part.
Input StagesThe decive offers several input stages for the different signals which have to be handled by the system. A
quasi differential input (see figure 2) can be used for (external) CD-changer. The two mono differential in-
puts allow the connection of Phone and Navigation (see figure 3) or it could be used as fully differential
stereo input. Additionally a single-ended stereo input is available for Cassette applications. The lower part
of the input section is dedicated to the tuner signals. Another quasi differential input (see figure 4) is used
to connect AM and FM referred to the tuner reference (Tuner-). This concept supports also double tuner
systems. Also two seperate level inputs are present which are followed by level-shifters to allow the use
of the TDA7500's ADCs. For AM noise blanking an envelope-detector driven by the AM-IF is also avail-
able.
TDA7501
Figure 2. Quasi differential input-stage.
Figure 3. Mono differential input-stage.
Figure 4. Differential input-stage for AM/FM.
Dual MPX modeThe TDA7501 is able to support a twin tuner concept via the Dual-MPX-Mode. In this configuration the
FM-pin and the AM-pin are acting as MPX1 and MPX2 inputs. The DC-Voltage at the TUNER- -pin con-
trols whether MPX1, both MPX-signals or MXX2 is used to decode the stereo FM-signal (see figure 4
Please note that the thresholds have a hysteresis of 500mV. During this mode the high ohmic-mute acts
on both inputs in parallel.
Furthermore, a background tuner on the internal AM-path can be selected by software aswtching to one
of the two MPX-inputs.
For the programming of the Dual-MPX-Mode see the programming section.
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TDA7501
Figure 5. Block diagram Dual MPX.
Additional Quasi differential InputThe TDA7501 can be programmed to additional quasi-differential input by rearranging the configuration
of the navigation and AM level inputs. Since the AM level input becomes the 2nd differential input, the level
shift function is not available.
For the programming of the navigation/AM level input configuration see the programming section.
Figure 6. Additional quasi differential input simplified
Transfer function of the AM/FM level inputsIn the TDA7501 two level shift stages convert a tuner level (DC) signal to a unipolar output signal with
respect to the Codec Interface reference, that is 1.65V.
The FM level input can be programmed to a signal range of either 0 to 5V (Lo-range) which is the default,
or 0 to 6V (Hi range). The AM level input is fixed to the lower 0 to 5V input range.
For the programming of the FM level input range see the programming section.
TDA7501
Figure 7. AM/FM level inputs transfer function (DC)
DESCRIPTION OF THE OUTPUT PARTThe TDA7501 has 6 independent outputstage with volume control. The first 4 (main) outputs have an input
selector which allows to select besides the DAC-outputs CD-direct or Phone/Navigation-mix. In addition
one can mix the SPKR1 with Phone/Navigation so that traffic or navigation announcements can bypass
the DSP (see figure 8).
The TDA7500 CODEC outputs have a maximum output voltage of 0.5Vrms . To obtain 4Vrms , (in the
dual supply mode only) the signal is first amplified to have a reference amplitude of 2V rms. The following
volume stage offers up to 15dB gain which gives along with the programmable 6dB gain in the output-
stage enough overdrive capability. To achieve the maximum output swing of 4Vrms the device must be
supplied with an additional supply of 12V. With a single supply (Vdd = VCC = 8.3V) 2.8Vrms are obtained
at the output at maximum.
Figure 8. Output part.
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TDA7501
Overall gain structureThe overall gain structure of the TDA7501 can be shown in its target application together with the V225.
The output part in level select (D6/4) offers an additional adaption to the DSP's output level
Figure 9. Level-diagram.
Speaker (linedriver) outputsThe Speaker outputs can be configured in three different operating modes:
- Internal reference mode with 0dB output gain,
- External reference mode with 0dB output gain
- External reference mode with 6dB output gain
Basically, in the internalreference mode the Linedriver amplifier acts as a buffer with 0dB gain regardless
of the output gain programmed by bit D0. Since the buffer tracks the internal generated reference, the
OUTPUTREF pin may be left floating.
In the external reference mode the linedriver amplifiers reference tracks the voltage present at the OUT-
PUTREF pin. This reference does not necessary have to be external to the device, it can also be gener-
ated by invoking the VCC/2 divider inside the TDA7501 (bit D1/6). In practice, the term external reference
implied that the OUTPUTREF pin at least has to connect to an external capacitor. In the external reference
mode, an additional gain of 6dB can be added by assessing bit D0. This provides a nominal 4VRMS output
level in case the TDA7501 is powered from a dual supply (VDD = 8.3V). When fed from a single supply,
only 2.8VRMS output level can be acheived.
For the programming of output gain and reference selection see the programming section.
Figure 10. Speaker (Linedriver) outputs simplified
TDA7501
REFERENCE CONCEPTFor the input section the TDA7501 generates the internal reference voltage by multiplying the V33 voltage
by 1.2575.
The V33 voltage is also buffered and fed back to the CODEC where it is used to generate all necessary
references. For best performance it is recommended to filter the V33 reference pin by means of a passive
second order lowpass as shown in figure 11. This concept allows a direct DC coupling between the
TDA7501 and the DSP because of the accurate matching of DC levels. On the output side the TDA7501
offers two main modes: a single supply and a dual supply mode.
Dual supply modeIn this mode the outputs are able to provide up to 4V rms with a minimum supply VCC of 12V as well as a
output reference voltage set to half of VCC (bit D0 of the mode select byte set to '1').
If the switch D1/byte mode select is open the output reference voltage must be defined externally e.g. a
zener diode with RC-lowpass.
If the switch is closed the reference voltage will be half of VCC and only an external capacitor has to be
added.
Single supply modeIf VCC and Vdd are connected to a single supply the maximum possible output swing is about 2.8V rms .
The output reference voltage pin can be left open or otherwise the internal voltage divider can be used to
generate for the outputs a VCC/2 reference.
Figure 11. Reference voltage generation
