Sanyo EP93F manual LA2351M1M, LC78685V

WMA Decoder

LC78685V	Conditional	❋ : Use of conditional products requires
	productproduct
	Product	consultation with a SANYO representative

7.5 Mbps Automotivetomotive LANLAN TransceiverTransceiver

LA2351M1M

Newew

Overview

prior to the use of the device.

Overview

The LC78685V is a WMA❋ decoder IC. This IC is implemented using a dedicated hard wired circuit structure

to achieve low power consumption. Various format (CD-DA, MP3, and WMA) audio data recorded on CDs can be played back by adding this IC to a system structure consisting of a CD player signal-processing IC and a CD-MP3 IC (such as the LC78684).

The LC78685V makes it easy to implement CD players that provide multiformat decoding functions.

Features

■WMA (Windows Media Audio) decoding functions ◆Supports version 8

◆Bit rates: 32 to 192 kbps

◆Sampling frequencies: 22.05 kHz to 48 kHz ◆Header information readout function ◆Automatic framing error recovery function

■Audio data functions ◆WMA playback mode

:Serial audio signal output using the LRCK, BCK, and DATA signals

(Output supports the I2S format, 16- or 20-bit PCM output precision, 16-, 24-, and 32-bit output modes selectable for data-slot output)

:Attenuator and muting (-∞ , -12 dB) functions

:Base clock (384 Fs) output for external digital filters and D/A converter

■Audio data other than WMA

◆The system clock and audio data input to the CKIN, LRCKIN, BCKIN, and DATAIN pins is output directly without

change from the CKOUT, LRCKO, BCKO, and DATA pins. That is, CD-DA and MP3 playback data from the LC78684 is directly output to the D/A converter.

■Supply voltages ◆Internal: 1.8 V ◆I/O: 3.3 V

■Package: SSOP24 (275 mil)

❋ : WMA: Windows Media Audio

Windows Media is a registered trademark of Microsoft Corporation in the US and other countries.

Block Diagram

		STRDY	CE CL CMIDIN	CMIDOUT
CKIN	Clock		MICOM I/F
CKOUT	Generator
DEMAND		WMA
ZCSWMA	Input	Decoder
STCKIN	Buffer
STDATIN
			Main
			Memory
LRIN		Audio		LRCKO
BCKIN				BCKO
		Output
DATAIN				DATAO
RESB
TEST

The LA2351M is a low-noise transceiver IC for automotive LANs.

Functions

■Transmitter block

◆A/D converter (3 bits)

◆Low-pass filter (for EMI prevention) ◆Output driver

■Receiver block

◆Reception amplifier

◆Noise rejection low-pass filter (for the received signal) ◆Comparator (for waveshaping)

Features

■Accepts either 3-bit digital or stepped waveform signals as the input signal.

If a 3-bit digital signal cannot be used due to EMI and wiring issues, provide an R-2R ladder near the protocol chip and connect the D/A converted signal to the low-pass filter input.

■A 5 Mbps or 7.5 Mbps automotive LAN can be implemented by combining the LA2351M with an automotive LAN protocol IC (ARCNET controller TMC20040C series device).

■The low-pass filter required for adjustment is built in

■Supports low-noise data communication

■Package: MFP30SD (375 mil)

Block Diagram

0.1∝F

VCC

0.1

∝

F

External DAC

0.1

∝

3.3∝F

0.1

∝

F

F

0.1∝F

0.1∝F

TXI0

TXI1

TXI2

RADO

CC

TXEN

V

0.1∝F

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

DAC

LPF

Driver

Amp

Receiver Amp

Noise

Filter

Comparater

VCC

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

0.1∝F

3.3∝F

2.2kΩ

0.1∝F

VCC

33kΩ

0.1∝F

0.1∝F

0.1∝F

∝

330kΩ

0.1 F

OUT PUT

3.3V

COMP

GND

OUT-OFF

COMP

330kΩ

GND

CONTROL BIAS

VCC

0.1∝F

2.2kΩ

DATA OUT

19 Car Audio 20 Car Audio