ad6435 Analog Devices, Inc., ad6435 Datasheet

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ad6435

Manufacturer Part Number
ad6435
Description
Adsl Shipset
Manufacturer
Analog Devices, Inc.
Datasheet

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This Material Copyrighted By Its Respective Manufacturer
a
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FEATURES
Component in Analog Devices DMT ADSL Chipset—
Designed to ANSI/ETSI T1.413
Suitable for CO or Residence (ATU-R and ATU-C)
Performs All Digital Interface Tasks:
Absolute Maximum Data Rate: 12 Mbps Simplex/
Simple Interface: Synchronous Simplex and Duplex
128-Lead TQFP
Operating Temperature Range: –40 C to +85 C
3.3 V Operation, 400 mW
AD20msp910
Elastic Store; Byte-Stuffing/Robbing
Synchronization and EOC and AOC Insertion/Removal
CRC Generation/Detection
Scrambler and Descrambler
Forward Error Correction/Detection
Interleave/Deinterleave
4 Mbps Duplex
Streams
SIMPLEX_RX
DUPLEX_RX
SIMPLEX_TX
DUPLEX_TX
(ATU-C)
(ATU-R)
AD6435
BYTE–STUFF/ROB
ELASTIC STORE,
FRAMING,
FUNCTIONAL BLOCK DIAGRAM
RECEIVE
TRANSMIT
CONTROL
TO ADTSP2183
BYPASS PORT
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
GENERAL DESCRIPTION
The AD6435 is part of the Analog Devices ADSL chipset, the
AD20msp910. It accompanies the AD6436 (DMT accelerator),
AD6437 (single-chip analog front end) and ADTSP-2183 (con-
trol and DSP). Object code is also supplied. Offering a flex-
ible, standard-based approach (designed to ANSI T1.413,
Category 1) with low total bill of materials and high perfor-
mance, the chipset offers a straightforward approach to realizing
an ADSL modem.
The AD6435 interfaces the ADSL modem to the external sys-
tem, at either CO or RT modem. It implements all the bit-
stuffing/robbing and elastic store operations, and all digital
processing (block and forward error correction, scrambling,
interleaving, etc.). The AD6435 has four simple synchronous
connections, duplex in and out, simplex in (only used at
ATU-C) and simplex out (used at ATU-R), which may be
treated as the AS0 Simplex and LS0 duplex stream of the stan-
dard. These have “clean” clock and data, and may operate
asynchronously of one another, or of the modem itself.
INTERLEAVE RAM
DIGITAL LOGIC,
INTERLEAVING
FEC, CRC
World Wide Web Site: http://www.analog.com
TO AD6436/AD6439
FROM AD6436/AD6439
ADSL Chipset
© Analog Devices, Inc., 1997
AD6435

Related parts for ad6435

ad6435 Summary of contents

Page 1

... Analog Devices. This Material Copyrighted By Its Respective Manufacturer GENERAL DESCRIPTION The AD6435 is part of the Analog Devices ADSL chipset, the AD20msp910. It accompanies the AD6436 (DMT accelerator), AD6437 (single-chip analog front end) and ADTSP-2183 (con- trol and DSP). Object code is also supplied. Offering a flex- ible, standard-based approach (designed to ANSI T1 ...

Page 2

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD6435 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 3

... AD6435 17 DTIR 18 128 TQFP 19 TOP VIEW 20 (Not to Scale CONNECT –3– AD6435 102 A2 101 A3 100 VDD11 95 GND11 94 DSP_CLK A10 90 A11 89 A12 88 VDD10 87 GND10 ...

Page 4

... AD6435 PIN DESCRIPTION The AD6435 contains 91 signal pins, 33 output pins, 35 input pins, and 24 bidirectional pins. There are also 5 test pins and 28 digital supply pins, 2 analog supply pins, and 1 PLL bias pin for the PLL. Pin No. Pin Name 1–2 D1 TEST4 4 SIMPLX_TX ...

Page 5

... Ground. Input Transmit and Receive Serial Clock. Input Receive Byte Strobe Provided by the AD6436. Output Receive Data Request Provided by the AD6435. Input Receive Serial Data Provided by the AD6436. Input Receive Frame Strobe Provided by the AD6436. Input 14-Bit Address Bus for DSP Port. See also 86–90 and 94–101. ...

Page 6

... The AD6435 can implement rate adaptive ADSL (RADSL). This is under the control of the MP, and several different modes are supported. The absolute maximum data rate of the AD6435 is 12 Mbps downstream, and 4 Mbps upstream. However, the rate depends primarily on the channel conditions, and these rates will not be achieved on real loops, with attenuation and crosstalk ...

Page 7

... REV. 0 This Material Copyrighted By Its Respective Manufacturer In general tx clock signals (i.e., duplex_clcki, simplex_clki) are input to the AD6435, while the received data clock sig- nals (duplex_clko, simplex_clko) are outputs. In other words, the sending modem (at ATU-C or ATU-R) supplies the clock to the AD6435, and the receiving modem’s AD6435 recovers it (using a digital phase locked loop) and supplies it to the external system. The channels all have separate— ...

Page 8

... For the Duplex Rx channel, data is driven out of the AD6435 on the positive edge of the respective CLKO signal and should be sampled by the external circuit on the negative edge. For the Duplex Tx channel, the data is sampled by the AD6435 on the positive edge of the respective CLKO signal and should VALID DATA be driven by the external circuit on the negative edge ...

Page 9

... RDREQ-S RDREQ-H Figure 6. RX Serial I/F Timing –9– Typ TBS-S TBS-H VALID DATA t t TD-S TD-H Typ RBS-S RBS-H VALID DATA t t RD-S RD-H AD6435 Units Units ...

Page 10

... AD6435 TX Serial Port The TX serial interface between the DME and DTIR uses five (5) signals: TX_RX_SCLK: Serial clock provided by DME. TX_DREQ: Data request provided by DME. TX_FRM: Frame strobe provided by DME. TX_BS: Byte strobe provided by DTIR. TX_SDATA: Serial data provided by DTIR. RX Serial Interface ...

Page 11

... This Material Copyrighted By Its Respective Manufacturer NCS NWR t ASW CWR D t WDE NRD Figure 8. Write Operation –11– Min Max WRA t t WWR DDR t DW AD6435 Unit ...

Page 12

... AD6435 This Material Copyrighted By Its Respective Manufacturer OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 128-Lead Plastic Thin Quad Flatpack (ST-128) 0.063 (1.60) 0.630 (16.00) BSC TYP 0.551 (14.00) BSC 0.030 (0.75) 0.024 (0.60) 128 0.018 (0.45) 1 SEATING PLANE TOP VIEW (PINS DOWN) 0.003 (0.08 MAX 0.006 (0.15) 0.020 (0.50) 0.011 (0.27) ...

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