TEA6824 Просмотр технического описания (PDF) - Philips Electronics

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производитель

TEA6824

Front-end and PLL synthesizers for car radios

Philips Electronics 

Philips Semiconductors

In Car Entertainment (ICE) car radio

Preliminary specification

TEA6824T

20

handbook, full pagewidth

V48-4

(dB)

0

–20

(1)

(4)

–40

(2)

–60

(3)

–80

10 –3

10 –2

10 –1

1

10

(1) AF: f = 450 kHz; m = 30%; fmod = 400 Hz. (2) Noise: unweighted B = 250 Hz to 15 kHz.

(3) THD m = 80%. (4) AM level voltage.

MHA214

8

THD

(%)

6

4

2

0

10 2

10 3

V33-34 (mV)

Fig.10 Signal, noise and distortion of AM AF output voltage and AM voltage level (typical curve).

I2C-BUS AND I2C-BUS CONTROLLED FUNCTIONS

I2C- bus specification

The standard I2C-bus specification is expanded by the

following definitions.

Structure of the I2C-bus logic: slave transceiver with auto

increment and expansion to switch a direct transfer of all

transmissions to an output for the radio front-end IC

TEA6810T.

Sub-addresses are not used.

DATA TRANSFER FOR THE TEA6824T

Data sequence:

• Address

• Byte 1

• Byte 2.

The data transfer may only be in this order. The transfer

direction of the data bytes is defined by the LSB of the

address.

The data becomes valid at the output of the internal

latches with the acknowledge of each byte. A STOP

condition after any byte can shorten transmission times.

When writing to the transceiver by using the STOP

condition before completion of the whole transfer:

• The remaining bytes will contain the old information

• If the transfer of a byte was not completed, this byte is

lost and the previous information is available.

DATA TRANSFER TO AN OUTPUT OF THE FRONT-END IC

A data bit in the transceiver of the TEA6824T enables or

disables a direct transfer of all transmissions to an

interface stage for the front-end IC.

For a transmission to the front-end IC the address and the

data format of the front-end IC has to be used.

Remark: The pull-up resistors for the front-end interface

(pins 6 and 7) should not be connected to the +5 V supply

voltage of the front-end IC, otherwise a bus pull-down

(pin 53) can occur during switching off the front-end supply

when the interface stage is enabled.

DATA TRANSFER TO THE IF IC

Data transfer to the IF IC (TEA6824T) is independent of

the state of interface stage for the front-end IC.

1997 May 05

16

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