MT9126AS Zarlink Semiconductor, MT9126AS Datasheet

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MT9126AS

Manufacturer Part Number
MT9126AS
Description
Description = Quad Adpcm (G.726) Transcoder ;; Package Type = Pdip ;; No. Of Pins = 28
Manufacturer
Zarlink Semiconductor
Datasheet

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Features
Applications
ENB2/F0od
Full duplex transcoder with four encode
channels and four decode channels
32 kb/s, 24 kb/s and 16 kb/s ADPCM coding
complying with ITU-T (previously CCITT) G.726
(without 40 kb/s), and ANSI T1.303-1989
Low power operation, 25 mW typical
Asynchronous 4.096 MHz master clock
operation
SSI and ST-BUS interface options
Transparent PCM bypass
Transparent ADPCM bypass
Linear PCM code
No microprocessor control required
Simple interface to Codec devices
Pin selectable
Pin selectable ITU-T or signed magnitude PCM
coding
Single 5 volt power supply
Pair gain
Voice mail systems
Wireless telephony systems
ADPCMo
ADPCMi
MCLK
ENB1
BCLK
EN1
EN2
C2o
F0i
Law or A-Law operation
VDD VSS PWRDN IC
Timing
Figure 1 - Functional Block Diagram
ADPCM
I/O
MS1 MS2
Full Duplex
Transcoder
Quad
MS3
Description
The Quad ADPCM Transcoder is a low power,
CMOS device capable of four encode and four
decode functions per frame. Four 64 kbit/s PCM
octets are compressed into four 32, 24 or 16 kbit/s
ADPCM words, and four 32, 24 or 16 kbit/s ADPCM
words are expanded into four 64 kbit/s PCM octets.
The 32, 24 and 16 kbit/s ADPCM transcoding
algorithms
Recommendation G.726 (excluding 40 kbit/s), and
ANSI T1.303 - 1989.
Switching, on-the-fly, between 32 kbit/s and 24 kbit/s
ADPCM, is possible by controlling the appropriate
mode select (MS1 - MS6) control pins. All optional
functions of the device are pin selectable allowing a
simple interface to industry standard codecs, digital
phone devices and Layer 1 transceivers. Linear
coded PCM is provided to facilitate external DSP
functions .
A/ FORMAT
MT9126AE
MT9126AS
Control Decode
PCM
I/O
utilized
MS4
Quad ADPCM Transcoder
Ordering Information
-40 C to +85 C
MS5
28 Pin Plastic DIP
28 Pin SOIC
MS6 LINEAR SEL
ISSUE 3
CMOS
conform
Data Sheet
MT9126
to
April 2002
PCMo2
PCMi2
PCMo1
PCMi1
ITU-T
8-89

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MT9126AS Summary of contents

Page 1

... Timing C2o EN1 EN2 VDD VSS PWRDN IC MT9126AE MT9126AS Description The Quad ADPCM Transcoder is a low power, CMOS device capable of four encode and four decode functions per frame. Four 64 kbit/s PCM octets are compressed into four 32 kbit/s ADPCM words, and four 32 kbit/s ADPCM words are expanded into four 64 kbit/s PCM octets ...

Page 2

MT9126 Pin Description Pin # Name 1 EN1 Enable Strobe 1 (Output). This 8 bit wide, active high strobe is active during the B1 PCM channel in ST-BUS mode. Becomes a single bit, high true pulse when LINEAR=1. In SSI ...

Page 3

Data Sheet Pin Description Pin # Name 10 ENB2/F0od PCM B-Channel Enable Strobe 2 (Input) / Delayed Frame Pulse (Output). SSI operation: ENB2 (Input). An 8-bit wide enable strobe input defining B2 channel (AD)PCM data. A valid 8-bit strobe must ...

Page 4

MT9126 Pin Description Pin # Name 19 MS1 Mode Selects 1, 2 and 3 (Inputs). Mode selects for all four encoders. 20 MS2 MS3 MS2 21 MS3 ...

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Data Sheet Functional Description The Quad-channel ADPCM Transcoder is a low power, CMOS device capable of four encode and four decode operations per frame. Four 64 kbit/s channels (PCM octets) are compressed into four 32 kbit/s ADPCM ...

Page 6

MT9126 three of the serial I/O ports. BCLK can be any frequency between 128 kHz synchronized to the input strobes. BCLK may be discontinuous outside of the strobe boundaries except when LINEAR=1. In LINEAR mode, BCLK must be 2048 kHz ...

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Data Sheet mode. Similarily, the four 2-bit ADPCM words on ADPCMi are transparently bypassed, with a two frame delay, to PCMo1 and PCMo2 during the ENB1 or B1 timeslot. Bits 3-8 are don’t care. (See Figures 6 & 9.) When ...

Page 8

MT9126 from ADPCMi are expanded into four 16-bit uniform PCM dual-octets on PCMo1 and PCMo2. 16-bit uniform PCM are received and transmitted most significant bit first starting with b15 and ending with b0. ADPCM data are transferred most significant bit ...

Page 9

Data Sheet BCLK ENB1 ENB2/F0od PCMi/o1 PCMi/o2 32 kb/s ADPCM i/o 24 kb/s ADPCM i undetermined logic level output; don’t care input Outputs high impedance outside of channel strobe boundaries Two frame delay from data input ...

Page 10

MT9126 BCLK ENB1 ENB2/F0od PCMi/o1 ADPCMo/i PCMi/o2 PCMi/o1 ADPCMo/i PCMi/o2 PCMi/o1 ADPCM o/i PCMi/ undetermined logic level output; don’t care input Outputs high impedance outside of channel strobe boundaries Two frame delay from data input to data output ...

Page 11

Data Sheet MCLK (C4) F0i ENB2/F0od C2o (output) EN1 (output) EN2 (output) PCMi1 PCMo1 PCMi2 PCMo2 0 1 ADPCMi 0 1 ADPCMo outputs=High impedance inputs = don’t care X = undetermined logic level output; don’t care ...

Page 12

MT9126 MCLK (C4i) F0i C2o EN1 (output) F0od/ENB2 SSS PCMi/o1 B1 PCMi/o2 ADPCMi/o (32/24 kb/s) bit kbit/s ADPCMi/o (16 kb/s) outputs = ...

Page 13

Data Sheet MCLK F0i ENB2/F0od C2o EN1 (output) EN2 (output PCMi1 PCMo1 PCMi2 PCMo2 ADPCMi ADPCMo PCMi/o1 PCMi/ ...

Page 14

MT9126 Processing Delay Through the Device In order to accommodate variable rate PCM and ADPCM interfaces, the serial input and output streams require a complete frame to load internal shift registers. Internal frame alignment of the encoding/decoding functions are taken ...

Page 15

Data Sheet MT9126 PCMi1 PCMo1 PCMi2 PCMo2 C4i F0i F0i F0od F0od 2 1 Figure 11 - ISDN Line Card with 32 kbit/s ADPCM F0i LIN+ LIN- F0i F0b LOUT- MCLK C4b LOUT+ ADPCMi DSTo ADPCMo DSTi ...

Page 16

MT9126 8-104 Data Sheet ...

Page 17

Data Sheet MT8920 DSP P A 2nd serial port STPA if available ST-BUS port System Frame pulse CLKR CLKX DR DX Figure 13 - ST-BUS to DSP Platform MT9126 System 4.096MHz MT9126 C2o F0i MCLK (C4i) PCMo1 ...

Page 18

MT9126 Absolute Maximum Ratings* Parameter 1 Supply Voltage 2 Voltage on any I/O pin 3 Continuous Current on any I/O pin 4 Storage Temperature 5 Package Power Dissipation * Exceeding these values may cause permanent damage. Functional operation under these ...

Page 19

Data Sheet AC Electrical Characteristics Voltages are with respect to ground (V ) unless otherwise stated. SS Characteristics 1 BCLK Clock High 2 BCLK Clock Low 3 BCLK Period 4 Data Output Delay (excluding first bit) 5 Output Active to ...

Page 20

MT9126 t BCP BCLK S t SSS S ENB1 I or ENB2 PCMi/ADPCMi t SD PCMo/ADPCMo S MCLK F0iH U S F0i t F0iS F0od AC Electrical Characteristics Voltages are with respect to ground (V ) ...

Page 21

Data Sheet AC Electrical Characteristics Voltages are with respect to ground (V ) unless otherwise stated. SS Characteristics 1 Mode Select Setup 2 Mode Select Hold † Timing is over recommended temperature & power supply voltages. ‡ Typical figures are ...

Page 22

MT9126 Notes: 8-110 Data Sheet ...

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... For more information about all Zarlink products Information relating to products and services furnished herein by Zarlink Semiconductor Inc. trading as Zarlink Semiconductor or its subsidiaries (collectively “Zarlink”) is believed to be reliable. However, Zarlink assumes no liability for errors that may appear in this publication, or for liability otherwise arising from the application or use of any such information, product or service or for any infringement of patents or other intellectual property rights owned by third parties which may result from such application or use ...

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