TDA7421N datasheet(4/38 Pages) STMICROELECTRONICS

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TDA7421N

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LP IN3

FM-HS loop filter connection to op-amp inverting input

PLL VREF

Voltage reference to Op Amp noninverting input

PLL GND

PLL ground

SLEEP

I2C bus disconnect signal

SDA

I2C bus data

SCL

I2C bus clock

DIG VDD

Digital positive supply

DIG GND

Digital ground

28 (*)

IFC SSTOP

AM STEREO OUT

IF-Counter stop signal or

AM IF2 amplifier output

CLN GND

“Clean” ground

IF2 GND

IF2 ground

AM AGC2 TC

AM 2nd AGC time constant

AM DET

AM detector capacitor

AM BPF

AM IF filter

AM REF

Reference voltage of AM IF amplifier

AM IF2 in

AM IF2 amplifier input

IF2 VCC

IF2 positive supply

FM QUAD -

FM quadrature detector tank (differential -)

FM QUAD +

FM quadrature detector tank (differential +)

AUDIO OUT

FM MPX/AM Audio output

40 (*)

FM SD

AM SD

FM station detector output or

AM station detector output

41 (*)

FM SMETER

AM SMETER

FM DET ADJ

FM S-meter output or

AM S-meter output or

FM detector adjustment output

FM MUTE DRIVE

FM mute time constant

FM BW TC

FM detuning detector time constant

IF1 GND

IF1 ground

FM LIM IN -

FM limiter negative input (differential -)

FM LIM IN +

FM limiter negative input (differential +)

IF1 VCC

IF1 positive supply

FM IF AMP2 OUT

FM 2nd IF amplifier output

Name

Function

PIN DESCRIPTION (Continued)

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