TDA7402 Fast Delivery |IC PHOENIX CO.,LIMITED

TDA7402 ,CARRADIO SIGNAL PROCESSORTDA7402CARRADIO SIGNAL PROCESSOR■ 3 STEREO INPUTS■ 3 MONO INPUTS■ DYNAMIC-COMPRESSION-STAGE FOR CD■ ..
TDA7403D ,BASIC SIGNAL PROCESSORABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitVS Operating Supply Voltage 10.5 VTamb Operating ..
TDA7404D ,CARRADIO-SIGNAL-PROCESSORTDA7404DCARRADIO-SIGNAL-PROCESSOR■ 4 STEREO INPUTS■ 1 MONO INPUTS■ SOFTSTEP-VOLUME■ BASS, TREBLE AN ..
TDA7404DTR ,CARRADIO SIGNAL PROCESSORBLOCK DIAGRAMMIXMono Fader Out LFDiffinLDiffgnd Mono Fader Out RFDiffinRMono Fader Out LRSE1LMono F ..
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THMC50 ,REMOTE/LOCAL TEMPERATURE MONITOR AND FAN CONTROLLER WITH SMBus INTERFACE
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THN4201U , NPN SiGe RF TRANSISTOR
THN4201U , NPN SiGe RF TRANSISTOR
THN5601B , NPN SiGe RF POWER TRANSISTOR
THN5601B , NPN SiGe RF POWER TRANSISTOR

TDA7402
CARRADIO SIGNAL PROCESSOR
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TDA7402
April 2002 3 STEREO INPUTS 3 MONO INPUTS DYNAMIC-COMPRESSION-STAGE FOR CD SOFTSTEP-VOLUME BASS, TREBLE AND LOUDNESS CONTROL VOICE-BAND-FILTER DIRECT MUTE AND SOFTMUTE INTERNAL BEEP FOUR INDEPENDENT SPEAKER-OUTPUTS STEREO SUBWOOFER OUTPUT INDEPENDENT SECOND SOURCE-
SELECTOR FULL MIXING CAPABILITY PAUSE DETECTOR
Stereodecoder: RDS MUTE NO EXTERNAL ADJUSTMENTS AM/FM NOISEBLANKER WITH SEVERAL
TRIGGER CONTROLS PROGRAMMABLE MULTIPATH DETECTOR QUALITY DETECTOR OUTPUT
Digital Control:2 C-BUS INTERFACE
DESCRIPTION
The device includes a high performance audiopro-
cessor and a stereodecoder-noiseblanker combina-
tion with the whole low frequency signal processing
necessary for state-of-the-art as well as future carra-
dios. The digital control allows a programming in a
wide range of all the filter characteristics. Also the
stereodecoder part offers several possibilities of pro-
gramming especially for the adaptation to different
IF-devices.
CARRADIO SIGNAL PROCESSOR
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PIN CONNECTION (Top view)
ESD:
All pins are protected against ESD according to the MIL883 standard.
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
SUPPLY
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BLOCK DIAGRAM
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Audioprocessor Part Features:
Input Multiplexer 2 fully differential CD stereo inputs with programmable attenuation
1 single-ended stereo input
2 differential mono input
1 single-ended mono input
In-Gain 0..15dB, 1dB steps
internal Offset-cancellation (AutoZero)
separate second source-selector
Beep internal Beep with 4 frequencies
Mixing stage Beep, Phone and Navigation mixable to all speaker-outputs
Loudness programmable center frequency and frequency response
15 x 1dB steps
selectable flat-mode (constant attenuation)
Volume 0.5dB attenuator
100dB range
soft-step control with programmable times
Compander dynamic range compression for use with CD
2:1 compression rate
programmable max. gain
Bass 2nd order frequency response
center frequency programmable in 8 steps
DC gain programmable
Treble 2nd order frequency response
center frequency programmable in 4 steps
Voice Bandpass 2nd order butterworth highpass filter with programmable cut-off frequency
2nd order butterworth lowpass filter with programmable cut-off frequency
selectable flat-mode
Speaker 4 independent speaker controls in 1dB steps
control range 95dB
separate Mute
Subwoofer single-ended stereo output
independent stereo level controls in 1dB steps
control range 95dB
separate Mute
Mute Functions direct mute
digitally controlled SoftMute with 4 programmable mute-times
Pause Detector programmable threshold
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ELECTRICAL CHARACTERISTICS
VS = 9V; Tamb = 25°C; RL = 10kΩ; all gains = 0dB; f = 1kHz; unless otherwise specified
INPUT SELECTOR
DIFFERENTIAL STEREO INPUTS
DIFFERENTIAL MONO INPUTS
BEEP CONTROL
MIXING CONTROL
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MULTIPLEXER OUTPUT 1
LOUDNESS CONTROL
VOLUME CONTROL
SOFT MUTE
ELECTRICAL CHARACTERISTICS (continued)
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Notes:1. If configured as Multiplexer-Output The SM-Pin is active low (Mute = 0)
BASS CONTROL
TREBLE CONTROL
ELECTRICAL CHARACTERISTICS (continued)
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PAUSE DETECTOR1
SPEAKER ATTENUATORS
Notes:1. If configured as Pause-Output
AUDIO OUTPUTS
VOICE BANDPASS
ELECTRICAL CHARACTERISTICS (continued)
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SUBWOOFER ATTENUATORS
SUBWOOFER Lowpass
Notes:1. If programmed as Subwoofer Diff.-Output
DIFFERENTIAL OUTPUTS1)
COMPANDER
ELECTRICAL CHARACTERISTICS (continued)
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Notes:1. If programmed as Subwoofer Diff.-Output
GENERAL
ELECTRICAL CHARACTERISTICS (continued)
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1.0 DESCRIPTION OF THE AUDIOPROCESSOR PART
1.1 Input stages
In the basic configuration two full-differential, two mono-differential, one single ended stereo and one single-
ended mono input are available. In addition a dedicated input for the stereodecoder MPX-signal is present.
Figure 1. Input-stages
Full-differential stereo Input 1 (FD1)
The FD1-input is implemented as a buffered full-differential stereo stage with 100kΩ input-impedance at each
input. The attenuation is programmable in 3 steps from 0 to -12dB in order to adapt the incoming signal level.
A 6dB attenuation is included in the differential stage, the additional 6dB are done by a following resistive divid-
er. This input is also configurable as two single-ended stereo inputs (see pin-out).
Full-differential stereo Input 2 (FD2)
The FD2-input has the same general structure as FD1, but with a programmable attenuation of 0 or 6dB em-
bedded in the differential stage.
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Mono-differential Input 1 (MD1)
The MD1-input is designed as a basic differential stage with 56kΩ input-impedance. This input is configurable
as a single-ended stereo input (see pin-out).
Mono-differential Input 2 (MD2)
The MD2-input has the same topology as MD1, but without the possibility to configure it to single ended.
Single-ended stereo Input (SE1), single-ended mono input (AM) and FM-MPX input
All single ended inputs offer an input impedance of 100kΩ. The AM-pin can be connected by software to the
input of the stereo-decoder in order to use the AM-noiseblanker and AM-High-Cut feature.
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. generated
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 alignment.
To avoid audible clicks the Audioprocessor is muted before the loudness stage during this time. The AutoZero-
feature is only present in the main signal-path.
AutoZero for Stereodecoder-Selection
A special procedure is recommended for selecting the stereodecoder at the main input-selector to guarantee
an optimum offset-cancellation:
(Step 0: SoftMute or Mute the signal-path)
Step 1: Temporary deselect the stereodecoder at all input-selectors
Step 2: Configure the stereodecoder via IIC-Bus
Step 3: Wait 1ms
Step 4: Select the stereodecoder at the main input-selector first
The root cause of this procedure is, that after muting the stereodecoder (Step 1), the internal stereodecoder
filters have to settle in order to perform a proper offset-cancellation.
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
outputs. For such applications the A619 could be switched in the AutoZero-Remain-Mode (Bit 6 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 Pause Detector / MUX-Output
The pin number 40(Pause/MUX) is configurable for two different functions:
1. During Pause-Detector OFF this pin is used as a mono-output of the main input-selector. This signal is often
used to drive a level-/equalizer-display on the carradio front-panel.
2. During Pause-Detector ON the pin is used to define the time-constant of the detector by an external capacitor.
The pause-detector is driven by the internal stereodecoder-outputs in order to use pauses in the FM-signal
for alternate-frequency-jumps. If the signal-level of both stereodecoder channels is outside the programmed
voltage-window, the external capacitor is abruptly discharged. Inside the pause-condition the capacitor is
slowly recharged by a constant current of 25μA. The pause information is also available via IIC-Bus (see IIC-
Bus programming).
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1.4 Loudness
There are four parameters programmable in the loudness stage:
1.4.1 Attenuation
Figure 2 shows the attenuation as a function of frequency at fP = 400Hz
Figure 2. Loudness Attenuation @ fP = 400Hz.
1.4.2 Peak Frequency
Figure 3 shows the four possible peak-frequencies at 200, 400, 600 and 800HzFigure 3: Loudness Center fre-
quencies @ Attn. = 15dB
Figure 3. Loudness Center frequencies @ Attn. = 15dB.
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1.4.3 Loudness Order
Different shapes of 1st and 2nd-Order Loudness
Figure 4. 1st and 2nd Order Loudness @ Attn. = 15dB, fP=400Hz
1.4.4 Flat Mode
In flat mode the loudness stage works as a 0dB to -19dB attenuator.
1.5 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 realized in a spe-
cial 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. Softmute-Timing
Note: Please notice that a started Mute-action is always terminated and could not be interrupted by a change of the mute -signal.
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1.6 SoftStep-Volume
When the volume-level is changed audible clicks could appear at the output. The root cause of those clicks
could either be a DC-Offset before the volume-stage or the sudden change of the envelope of the audiosignal.
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
Note: For steps more than 0.5dB the SoftStep mode should be deactivated because it could generate a hard 1dB step during the blend-time.
1.7 Bass
There are four parameters programmable in the bass stage:
1.7.1 Attenuation
Figure 7 shows the attenuation as a function of frequency at a center frequency of 80Hz.
Figure 7. Bass Control @ fC = 80Hz, Q = 1
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1.7.2 Center Frequency
Figure 8 shows the eight possible center frequencies 60, 70, 80, 90, 100, 130, 150 and 200Hz.
Figure 8. Bass center Frequencies @ Gain = 14dB, Q = 1
1.7.3 Quality Factors
Figure 9 shows the four possible quality factors 1, 1.25, 1.5 and 2.
Figure 9. Bass Quality factors @ Gain = 14dB, fC = 80Hz
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1.7.4 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.
Figure 10. Bass normal and DC Mode @ Gain = 14dB, fC = 80Hz
Note: The center frequency, Q and DC-mode can be set fully independently.
1.8 Treble
There are two parameters programmable in the treble stage:
1.8.1 Attenuation
Figure 11 shows the attenuation as a function of frequency at a center frequency of 17.5kHz.
Figure 11. Treble Control @ fC = 17.5kHz
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1.8.2 Center Frequency
Figure 12 shows the four possible center frequencies 10k, 12.5k, 15k and 17.5kHz.
Figure 12. Treble Center Frequencies @ Gain = 14dB
1.9 Subwoofer Application
Figure 13. Subwoofer Application with LPF 80/120/160Hz and HPF 90/135/180Hz
Both filters, the lowpass- as well as the highpass-filter, have butterworth characteristic so that their cut-off fre-
quencies are not equal but shifted by the factor 1.125 to get a flat frequency response.
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1.10 Voice-Band Application
Figure 14. VoiceBand Application with HPF 300/450/600/750Hz and LPF 3k/6kHz
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1.11 Compander
Signal-Compression
A fully integrated signal-compressor with programmable Attack- and Decay-times is present in the A619 (see
Figure 15).
The compander consists of a signal-level detection, an A/D-Converter plus adder and the normal SoftStep-Vol-
ume-stage. First of all the left and the right InGain-signal is rectified, respectively, and the logarithm is build from
the summed signal. The following low-pass smooth the output-signal of the logarithm-amplifier and improves
the low-frequency suppression. The low-pass output-voltage then is A/D-converted an added to the current vol-
ume-word defined by the IIC-Bus. Assuming reference-level or higher at the compander input, the output of the
ADC is 0. At lower levels the voltage is increasing with 1Bit/dB. It is obvious that with this configuration and a
0.5dB-step volume-stage the compression rate is fixed to 2:1 (1dB less at the input leads to 0.5dB less at the
output).
The internal reference-level of the compander is programmable in three steps from 0.5VRMS to 2VRMS. For a
proper behavior of the compression-circuit it is mandatory to have at a 0dB input-signal exactly the programmed
reference-level after the InGain-stage. E.g. at a configured reference-level of 0.5VRMS the output of the InGain-
stage has to have also 0.5VRMS at 0dB source-signal (Usually the 0dB for CD is defined as the maximum pos-
sible signal-level). To adapt the external level to the internal reference-level the programmable attenuation in
the differential-stages and the InGain can be used.
Figure 15. Compander Block Diagram
Anti-Clipping
In a second application the compander-circuit can be used for a Anti-Clipping or Limiting function. In this case
one of the dedicated inputs (AM or MPin) is connected directly to the Clip-Detector of the Power-Amplifier. If no
clipping is detected, the open-collector output of the Power-Amplifier is highohmic and the input-voltage of the
rectifier is VREF. The level-detector interprets this as a very small signal and reacts with the maximum pro-
grammed compander-gain. In the application this gain has to be compensated by decreasing the volume with
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the same value in order to get the desired output-level. In clipping situation the open-collector-current generates
a voltage-drop at the rectifier-input, which forces the compander to decrease the gain until the clipping disap-
pears.
It is even possible to run the compression-mode and the Anti-Clipping mode in parallel. In this case the maxi-
mum Compander-Gain should be set to 29dB.
1.11.1Characteristic
To achieve the desired compression characteristic like shown below the volume has to be decreased by 4dB.
Figure 16. Compander Characteristic
1.11.2I²C -BUS-Timing
During the Compander is working a volume-
word coming from this stage is added to the2 C-Bus volume-word and the volume is
changed with a soft slope between adjacent
steps (SoftStep-stage). As mentioned in the
description of this stage it is not recommend-
ed to change the volume during this slope. To
avoid this while the Compander is working
and the volume has to be changed, the com-
pander-hold-bit is implemented (Bit 7 in the
subaddress-byte). The recommended timing
for changing the volume during compander-
ON is the following:
1. Set the compander-hold-bit
2. Wait the actual SoftStep-time
3. Change the volume
4. Reset the compander-hold-bit
The SoftStep-times are in compander-ON condition automatically adapted to the attack-time of the Compander.
In the following table the related SoftStep-times are shown:
1.12 AC-Coupling
In some applications additional signal manipulations are desired, for example surround-sound or more-band-
equalizing. For this purpose an AC-Coupling is placed before the speaker-attenuators, which can be activated
or internally shorted by I²C-Bus. In short condition the input-signal of the speaker-attenuator is available at the
AC-Outputs. The input-impedance of this AC-Inputs is 50kΩ.
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1.13 Output Selector
The output-selector allows to connect the main- or the second-source to the Front-, Rear and Subwoofer speak-
er-attenuator, respectively. As an example of this programming the device is able to connect via software the
main-source to the back (rear) and the second-source to the front (see Figure 17). In addition to this stage allows
to setup different applications by IIC-Bus programming. In figure 18 to 20 three examples are given.
Figure 17. Output Selector
1.14 Subwoofer
Several different applications are possible with the Subwoofer-circuit:
1. Subwoofer-Filter OFF
a. Main-source stereo (AC-coupled)
b. Second-source stereo (DC-coupled)
c. Main-source mono-differential (DC-coupled)
d. Second-source mono-differential (DC-coupled)
2. Subwoofer-Filter ON
a. Main-source mono-differential (DC-coupled)
b. Second-source mono-differential (DC-coupled)
c. Center-Speaker-Mode (filtered mono signal at SWL, unfiltered mono signal at SWR)
In all applications the phase of the output-signal can be configured to be 0° or 180° . In the Center-Speaker-
Mode only at the filtered output the phase is changed.
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Figure 18. Application1 using internal Highpass- and mono Low-pass-Filter
Figure 19. Application2 using internal Highpass- and external stereo Low-pass-Filter
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Figure 20. Application3 using pure external Filtering (e.g. DSP)
1.15 Speaker-Attenuator and Mixing
A Mixing-stage is placed after each speaker-attenuator and can be set independly to mixing-mode. Having a full
volume for the Mix-signal the stage offers a wide flexibility to adapt the mixing levels.
Figure 21. Output Selector
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1.16 Audioprocessor Testing
During the Testmode, which can be activated by setting bit D0 of the stereodecoder testing-byte and the audio-
processor testing byte, several internal signals are available at the FD2R- pin. During this mode the input re-
sistance of 100kOhm is disconnected from the pin. The internal signals available are shown in the Data-byte
specification.
2.0 STEREODECODER PART
2.1 FEATURES: 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 programmable in a wide range FM/AMNoiseblanker with several threshold controls Multipath-detector with programmable internal/external influenceI2 C-bus control of all necessary functions
2.2 ELECTRICAL CHARACTERISTICS
VS = 9V, deemphasis time constant = 50μs, MPX input voltage VMPX = 500mV (75kHz deviation), modulation
frequency = 1kHz, input gain = 6dB, Tamb = 27°C, unless otherwise specified.
MONO/STEREO-SWITCH
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PLL
DEEMPHASIS and HIGHCUT
Carrier and harmonic suppression at the output
2.2 ELECTRICAL CHARACTERISTICS (continued)
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2.3 NOTES TO THE CHARACTERISTICS
2.3.1 Intermodulation Suppression
measured with: 91% pilot signal; fm = 10kHz or 13kHz.
2.3.2 Traffic Radio (V.F.) Suppression
measured with: 91% stereo signal; 9% pilot signal; fm=1kHz; 5% subcarrier (f=57kHz, fm=23Hz AM, m=60%)
2.3.3 SCA ( Subsidiary Communications Authorization )
measured with: 81% mono signal; 9% pilot signal; fm=1kHz; 10%SCA - subcarrier ( fS = 67kHz, unmodulated ).
Intermodulation (Note 2.3.1)
Traffic Radio (Note 2.3.2)
SCA - Subsidiary Communications Authorization (Note 2.3.3)
ACI - Adjacent Channel Interference (Note 2.3.4) VO signal() at1kHz()O spurious() at1kHz()-------------- --------------- ---------------- -------------------fs ;2 10kHz⋅ () 19kHz–== VO signal() at1kHz()O sp urious() at1kHz()-- --------------- --------------- --------------- -----------------fs; 313kHz⋅ () 38kHz–==
α57 V.W.F() VO signal() at1kHz()O spurious() at1kHz 23kHz± ()--------- --------------- -----------------------------------------------------------------=
α67 VO signal() at1kHz()O spurious() at1kHz()---- --------------- --------------- --------------- ---------------fs; 238kHz⋅ () 67kHz–==
2.2 ELECTRICAL CHARACTERISTICS (continued)
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2.3.4 ACI ( Adjacent Channel Interference )
measured with: 90% mono signal; 9% pilot signal; fm=1kHz; 1% spurious signal ( fS = 110kHz or 186kHz, un-
modulated).
2.4 NOISE BLANKER PART
2.4.1 Features: AM and FM mode internal 2nd order 140kHz high-pass filter for MPX path internal rectifier and filters for AM-IF path programmable trigger thresholds trigger threshold dependent on high frequency noise with programmable gain additional circuits for deviation- and fieldstrength-dependent trigger adjustment 4 selectable pulse suppression times for each mode programmable noise rectifier charge/discharge current
2.4.2 ELECTRICAL CHARACTERISTICS
All parameters measured in FM mode if not otherwise specified.
α114 VO signal() at1kHz()O spurious() at4kHz()------ --------------- ---------------- --------------- ------------fs; 110kHz 3 38kHz⋅ ()–==
α190 VO signal() at1kHz()O spurious() at4kHz()------ --------------- ---------------- --------------- ------------fs; 186kHz 5 38kHz⋅ ()–==
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Notes:
1.All thresholds are measured using a pulse with TR = 2 μs, THIGH= 2 μs and TF = 10 μs. The repetition rate must not increase the
PEAK voltage.
2. By design/characterization functionally guaranteed through dedicated test mode structure
2.4.2 ELECTRICAL CHARACTERISTICS (continued)
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Figure 22. Trigger Threshold vs. VPEAK
Figure 23. Fig. 23: Deviation Controlled Trigger Adjustment
Figure 24. Fieldstrength Controlled Trigger Adjustment

Partno	Mfg	Dc	Qty	Available	Descript
TDA7402	PHI	N/a	49	avai	CARRADIO SIGNAL PROCESSOR