TDA7420 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

TDA7420

MULTIFUNCTION AUDIO PROCESSOR

STMicroelectronics 

TDA7420

Figure 3: Behaviour of the Field Strength Controlled Threshold Adjustment

VPEAK

3G

MONO

STEREO

TRIG. THRESHOLD

NOISE

2.4V(11)

1.9V(10)

1.3V(01)

ATC_SB OFF (00)

0.9V

noisy signal

good signal

E’

D94AU187B

Figure 4: Behaviour of the Deviation Dependent Threshold Adjust (Over Deviation Detector)

VPEAK

(V)

2.8

2.0

1.2

0.9

OVM=11

OVM=10

OVM=01

DETECTOR OFF (00)

D94AU188

20 32.5

45

I2C BUS INTERFACE

Interface Protocol

The interface protocol comprises:

A start condition (s)

A chip address byte, (the LSB bit determines

read/write transmission).

75

DEVIATION(KHz)

A subaddress byte

A sequence of data (N-bytes + acknowledge)

A stop condition (P)

CHIP ADDRESS

SUB ADDRESS

DATA 1...DATA n

MSB

LSB

MSB

LSB

MSB

S 1 0 0 0 1 0 0 R/W ACK X X T I A3 A2 A1 A0 ACK

DATA

ACK = Acknowledge

S = Start

P = Stop

I = Autoincrement

MAX CLOCK SPEED 500kbits/s

Autoincrement

If bit I in the subaddress byte is set to ”1”, the autoincrement of subaddress is enabled.

12/29

LSB

ACK P

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