TDA7421 datasheet(20/38 Pages) STMICROELECTRONICS

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ACK

MSB

LSB

MSB

LSB

MSB

LSB

CHIP ADDRESS

D96AU549

SUBADDRESS

DATA 1 to DATA n

T1 T0

A3 A2 A1 A0

Frame Example

For addressing the PLL part:

D96AU550

ACK

MSB

LSB

MSB

LSB

MSB

LSB

CHIP ADDRESS

SUBADDRESS

DATA 1 to DATA n

A3 A2 A1 A0

for the TUNER part:

ACK = Acknowledge

S = Start

P = Stop

I = Page mode

T2, T1, T0 = used in test mode (for PLL only, for

TUNER addressing they must be 0)

A3, A2, A1, A0 = Mode selection

TUNER SUBADDRESS

MSB

LSB

FUNCTION

STATUS

FM STOP STATION / FM IF AGC

FM SMETER SLIDER

AM AGC1 / AM STOP STATION

IFT1 / IFT2

FRONT END ADJUSTMENT

FM DEMODULATOR ADJUSTMENT

FM IF BUFFERS

FM AUDIO MUTE GAIN / FM SOFT MUTE

FM HOLE DETECTOR / FM DETUNING

Page mode disabled

Page mode enabled

must be "0"

PLL SUBADDRESS

MSB

LSB

FUNCTION

0000

Charge pump control

0001

PLL counter 1 (LSB)

0010

PLL counter 2 (MSB)

0011

PLL reference counter 1 (LSB)

0100

PLL reference counter 2 (MSB)

0101

PLL lockdetector control and PLL mode select

0110

IFC reference counter 1 (LSB)

0111

IFC reference counter 2 (MSB) and IFC mode select

1000

IF counter control 1

1001

IF counter control 2

page mode DISABLED

page mode enabled

T1, T2, T3 are used for testing the PLL, in application mode they have to be "0".

TDA7421

20/38

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