tda7421n STMicroelectronics, tda7421n Datasheet - Page 4

• Manufacturer Part Number: tda7421n
• Description: Am/fm Tuner For Car Radio And Hi-fi Applications
• Manufacturer: STMicroelectronics

TDA7421N
PIN DESCRIPTION (Continued)
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28 (*)
40 (*)
41 (*)
20
21
22
23
24
25
26
27
29
30
31
32
33
34
35
36
37
38
39
42
43
44
45
46
47
48
N.
AM STEREO OUT
FM IF AMP2 OUT
FM MUTE DRIVE
AM AGC2 TC
AM SMETER
FM SMETER
FM DET ADJ
FM LIM IN +
FM QUAD +
AUDIO OUT
IFC SSTOP
FM LIM IN -
FM QUAD -
FM BW TC
PLL VREF
CLN GND
PLL GND
DIG GND
AM IF2 in
DIG VDD
IF2 GND
IF1 GND
AM DET
AM BPF
AM REF
IF2 VCC
IF1 VCC
SLEEP
FM SD
AM SD
LP IN3
Name
SDA
SCL
FM-HS loop filter connection to op-amp inverting input
Voltage reference to Op Amp noninverting input
PLL ground
I
I
I
Digital positive supply
Digital ground
IF-Counter stop signal or
AM IF2 amplifier output
“Clean” ground
IF2 ground
AM 2
AM detector capacitor
AM IF filter
Reference voltage of AM IF amplifier
AM IF2 amplifier input
IF2 positive supply
FM quadrature detector tank (differential -)
FM quadrature detector tank (differential +)
FM MPX/AM Audio output
FM station detector output or
AM station detector output
FM S-meter output or
AM S-meter output or
FM detector adjustment output
FM mute time constant
FM detuning detector time constant
IF1 ground
FM limiter negative input (differential -)
FM limiter negative input (differential +)
IF1 positive supply
FM 2
2
2
2
C bus disconnect signal
C bus data
C bus clock
nd
nd
IF amplifier output
AGC time constant
Function