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WMA Decoder
WMA Decoder
LC78685V
LC78685V
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 I
2
S 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)
Block Diagram
CKIN
Clock
CKOUT
Generator
DEMAND
ZCSWMA
Input
STCKIN
Buffer
STDATIN
LRIN
BCKIN
DATAIN
RESB
TEST
19 Car Audio
Conditional
Conditional
: Use of conditional products requires
Product
Product
consultation with a SANYO representative
prior to the use of the device.
New
New
New
product
product
product
: WMA: Windows Media Audio
Windows Media is a registered trademark of Microsoft Corporation
in the US and other countries.
MICOM I/F
WMA
Decoder
Main
Memory
LRCKO
Audio
BCKO
Output
DATAO
7.5 Mbps Automotive LAN Transceiver
7.5 Mbps Automotive LAN Transceiver
LA2351M
LA2351M
Overview
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
V CC
External DAC
3.3 F
0.1 F
0.1 F
0.1 F
30
29
28
27
26
25
24
23
DAC
LPF
Noise
Filter
Comparater
1
2
3
4
5
6
7
8
0.1 F
V CC
33k
0.1 F
COMP
GND
OUT-OFF
OUT PUT
3.3V
GND
CONTROL
V CC
DATA OUT
0.1 F
0.1 F
0.1 F
0.1 F
22
21
20
19
18
17
16
Driver
Amp
Receiver Amp
V CC
9
10
11
12
13
14
15
2.2k
0.1 F
0.1 F
0.1 F
0.1 F
330k
COMP
330k
BIAS
0.1 F
2.2k
20 Car Audio
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