TDA7421 Просмотр технического описания (PDF) - STMicroelectronics
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TDA7421 Datasheet PDF : 38 Pages
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TDA7421
PIN DESCRIPTION (continued)
N.
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28(*)
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40 (*)
41(*)
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Name
DIG GND
IFC SSTOP
AM STEREO OUT
CLN GND
IF2 GND
AM AGC2 TC
AM DET
AM BPF
AM REF
AM IF2 in
IF2 VCC
FM QUOD -
FM QUAD +
AUDIO OUT
FM SD
AM SD
FM SMETER
AM SMETER
FM DET ADJ
FM MUTE DRIVE
FM BW TC
IF1 GND
FM LIM IN -
FM LIM IN +
IF1 VCC
FM IF AMP2 OUT
FM IF AMP2 IN -
FM IF AMP2 IN +
FM IF AMP1 OUT
FM IF AMP1 IN -
FM IF AMP1 IN +
AM MIX2 OUT -
AM MIX2 OUT +
RF VCC
AM MIX2 IN -
AM MIX2 IN +
FM IF AGC IN
MIX OUT -
MIX OUT +
AM AGC1 TC
AM AGC1 RF AMP
AM AGC1 PIN
Function
Digital circuits ground
Search stop signal or
Output (single ended) of AM IF amplifier
"Clean" ground
IF 2nd ground
AM 2nd AGC time constant
Connection to the capacitor of the AM diode-capacitor detector
Connection to the AM IF filter
Reference voltage of AM IF amplifier
Input (single ended) of AM 2nd IF amplifier
IF 2nd positive supply
"-" Insertion pt. of FM quadrature network (differential)
"+" Insertion pt. of FM quadrature network (differential)
Audio frequency output (single ended)
FM Station detector output or
AM Station detector output
FM S-meter output or
AM S-meter output or
FM detuning adjustment
FM mute time constant
FM detuning detector time constant
IF 1st ground
Input "-" of FM limiter (differential input)
Input "+" of FM limiter (differential input)
IF 1st positive supply
Output (single ended) of the FM IF 2nd amplifier buffer
Input "-" of the FM IF 2nd amplifier (differential input)
Input "+" of the FM IF 2nd amplifier (differential input)
Output (single ended) of the FM IF 1st amplifier buffer
Input "-" of the FM IF 1st amplifier (differential input)
Input "+" of the FM IF 1st amplifier (differential input)
Output "-" of the AM 2nd mixer (differential output)
Output "+" of the AM 2nd mixer (differential output)
RF stage positive supply
Input "-" to the AM 2nd mixer (differential input)
Input "+" to the AM 2nd mixer (differential input)
Input FM IF AGC circuit
Output "-" of the FM/AM 1st mixer (differential output)
Output "+" of the FM/AM 1st mixer (differential output)
AM 1st AGC time constant
Voltage output of the AM 1st AGC, to the transistor of the RF AF amplifier
Current output of the AM 1st AGC, to the PIN diodes antenna AM attenuator
(*) Pin function is user-defined by software.
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