OKI Semiconductor
ML7204-001
VoIP CODEC
FEDL7204-001DIGEST-01
Issue Date: Aug. 12, 2004
GENERAL DESCRIPTION
The ML7204-001 is a speech CODEC for VoIP. As a speech CODEC, this LSI allows selection of
G.729.A/G711 and supports the PLC (Packet Loss Concealment) function.
With an echo canceler that handles 32 ms-delay and FSK detection/generation, DTMF detection/generation, and
tone detection/generation functions, the ML7204-001 is the most suitable LSI for adding the VoIP function to
TAs and routers.
FEATURES
•
Power supply voltage
Digital power supply voltage (DVDD0, 1, 2):
3.0 to 3.6 V
Analog power supply voltage (AVDD):
3.0 to 3.6 V
•
Speech CODEC:
G.729.A (8 kbps)/G.711 (64 kbps)
µ-law
and A-law (supports individual setting for transmission and
reception)
Supports ITU-T G.711 Appendix 1 compliant PLC (Packet Loss Concealment) function
Supports the 2-channel processing function (for 3-way communication)
•
Built-in FIFO buffer (640 bytes) for transmission/reception data transfer
Allows selection of Frame/DMA (slave) interface
•
Echo canceler for handling 32 ms delay
•
DTMF detection
•
DTMF generation (the tone generation function enables generation of DTMF signals)
•
Tone detection:
2 types (1650 Hz and 2100 Hz: Detection frequency can be changed)
•
Tone generation:
2 types
•
FSK detection
•
FSK generation
•
Built-in 16-bit timer:
1 channel
•
Dial pulse detection function (secondary function of general-purpose I/O ports)
•
Dial pulse transmission function (secondary function of general-purpose I/O ports)
•
General-purpose I/O ports
64-pin package: Equipped with 7 ports (with some of them having secondary function allocation)
100-pin package: Equipped with 21 ports (with some of them having secondary function allocation)
•
Two types of built-in linear PCM CODEC (CODEC_A and CODEC_B)
•
Analog interface
CODEC_A side: Incorporates one type each of input amplifier and output amplifier (10 kΩ driving)
CODEC_B side: Incorporates one type each of input amplifier and output amplifier (10 kΩ driving)
•
PCM interface coding format:
Allows selection of 16-bit linear/G.711 (64 kbps)
µ-law
or A-law
•
PCM serial transmission rate: 64 kHz to 2.048 MHz (fixed to 2.048 MHz for output)
•
PCM time slot assignment function (allows up to 2 slots for input and 1 slot for output individually)
When set to
µ-law/A-law:
Supports up to 32 slots (BCLK: 2.048 MHz)
When set to 16-bit linear: Supports up to 16 slots (BCLK: 2.048 MHz)
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