ST20138 Unicorn II
USB ADSL modem chipset: ST70138 + MTC20174 for ultra-low-BOM ADSL modem designs
Data Brief
Description
Performance, cost and time to market are key factors in DSL modem development. The Unicorn II chipset has been designed with all these care-abouts in mind, providing CPE manufacturers with a complete and extremely cost-effective solution for ADSL USB modems operating under a variety of operating systems, such as Microsoft WindowsTM, Mac OS and Linux. The controller-less architecture of the Unicorn II and the fact that it does not require an external SDRAM, make its external bill-of-materials (EBOM) best-in-class. Thanks to its small form factor packages and an external component count of less than 140, the Unicorn II easily fits on a small-dimension standard 2-layer single-sided PCB which further reduces overall system cost. Combining low power consumption, high-speed performance (up to 8 Mbps), field-proven driver software and customizable user interface, the Unicorn II is the ideal choice for cost-conscious equipment manufacturers, telecom operators/ISPs and ADSL users alike. Figure 1. Chipset architecture overview
The Unicorn II chipset consists of the ST70138 digital chip and the MTC20174 analog front end with integrated line driver. The ST70138 is supplied in two packages, LBGA80 and TQFP144. The ST70138T, packaged in TQ144, is pin-compatible to the ST70137 legacy ADSL USB chipset, enabling manufacturers to benefit directly from the cost and performance advantages that the ST70138 brings. Supplied in a compact LBGA80 package, the ST70138B brings additional cost advantages to new designs. The MTC20174 has been designed for use in DMT-based ADSL CPE modems than comply with ANSI T1.413 issue 2, ITU G.992.1 (G.dmt) andITU G.992.2 (G.lite), for Annex A and B, and the DT U-R2 specification.
ST70138
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USB
DMT engine + USB controller
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MTC20174 AFE
Line Interface
Phone Line
PC/Mac
EEPROM (0-16K B)
PC00120
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Standard compliance and interoperability
ST20138
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Standard compliance and interoperability
Drawing from eleven years of experience, ST developed this chipset that offers full compatibility with full-rate and G.lite ADSL standards, as well as the USB1.1 standard including plug-and-play support. The Unicorn II comes with a complete set of drivers for Microsoft Windows, Mac OS and Linux. It is fully interoperable with all major ADSL and ADSL2+ DSLAMs and complies with TR-048 (DSL Forum) and ETSI 101 388 performance requirements.
1.1
Supported protocols
RFC 2684 bridged (LLC/SNAP and VCMUX), replacing RFC 1483 RFC 2684 routed (LLC/SNAP and VCMUX), replacing RFC 1483 RFC 2364 PPP over ATM (LLC and VCMUX) RFC 2516 PPP over Ethernet (LLC and VCMUX) RFC 2225 Classical IP over ATM
1.2
ATM and ATM adaptation support
VPI range: 0 - 255 VCI range: 32 - 65535. UNI 3.0, 3.1, 4.0 signaling TR37 (auto-configuration) AAL0, AAL5 UBR, CBR (with customizable parameters)
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ST20138
Software suite
2
Software suite
The Unicorn II reference design package includes a comprehensive set of software drivers and tools for Windows, Mac and Linux, including PC software for modem control and communications protocols. The software drivers are fully configurable and include diagnostic tools which are specifically developed to minimize operator helpdesk interactions.
2.1
Software interface
NDIS WAN or NDIS5-ATM PCI driver and USB driver MAC / Linux OS: Open Transport driver
2.2
OS support
Win98, Win98SE, WinME, Win2K, WinXP, Windows Vista MAC OS 8.6 till 10.4.x Up to Linux kernel 2.6.x
2.3
Hardware interfaces
USB connector RJ11 connector
2.4
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8Mbps downstream 1Mbps upstream
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ST70138
UNICORN IITM USB controller-less ADSL transceiver
Data Brief
Features
Support digital signal processing requirements for one ADSL CPE channel (ITU-R) Compliant with ITU 992.1 (ADSL full rate) Annex A (ADSL over POTS), Annex B (ADSL over ISDN), ITU 922.2 (G.LITE) and ANSI T1.413. Enhanced FTP transfer capabilities Direct interface to USB (USB release 1.1 specification) Direct interface to external 8/16 bit serial memory to support USB user's configuration Direct analog front end interface for MTC20174 Clock and reset interface 1.8V and 3.3V power supply TTL logic levels compatible Power management capabilities Low power consumption : max 0.45W
TQFP144
LFBGA80
competitive and cost-focused DSL modem market. The Unicorn II chipset has been designed to provide CPE manufacturers with a complete and extremely cost-effective solution for ADSL USB modems operating under a variety of operating systems, such as Microsoft WindowsTM, Mac OS and Linux. The controller-less architecture of the Unicorn II and the fact that it does not require an external SDRAM, make its external bill-ofmaterials (E-BOM) best-in-class. Thanks to its small form factor packages and an external component count of less than 140, the Unicorn II easily fits on a small-dimension standard 2-layer single-sided PCB which further reduces overall system cost. Combining low power consumption, high-speed performance (up to 8 Mbps), field-proven driver software and customizable user interface, the Unicorn II is the ideal choice for cost-conscious equipment manufacturers, telecom operators/ISPs and ADSL users alike. The Unicorn II chipset consists of the ST70138 digital chip and the MTC20174 analog front end with integrated line driver. The ST70138 is supplied in two packages, LBGA80 and TQFP144. The ST70138T, packaged in TQ144, is pin-compatible to the ST70137 legacy ADSL USB chipset, enabling manufacturers to benefit directly from the cost and performance advantages that the ST70138 brings.Supplied in a compact LBGA80 package, the ST70138B brings additional cost advantages to new designs. The MTC20174 has been designed for use in DMT-based ADSL CPE modems than comply with ANSI T1.413 issue 2, ITU G.992.1 (G.dmt) and ITU G.992.2 (G.lite), for Annex A and B, and the DT U-R2 specification.
TQFP144 (backward compatible with ST70137 legacy ADSL USB chip) LFBGA80
Description
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The Unicorn II chipset is succeeding the fieldproven Unicorn, the first controller-less ADSL USB modem chipset that was deployed in volume. Compared to conventional USB ADSL chipsets, the Unicorn II dramatically reduces design and production costs of USB ADSL modems. The chipset which is manufactured in a cost-effective CMOS technology integrates a number of external components which results in reduced component count and PCB complexity. Thus E-BOM costs could be lowered significantly, while overall performance was improved.
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Its proven controller-less and SDRAM-less architecture is a key differentiator in today's highly
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ST70138
Ordering information
Ordering information
Table 1. Order codes
Part Number E-ST70138B E-ST70138T
1. Ecopack
Package LFBGA80(1) TQFP144 (*)
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MTC20174
ADSL analog front-end with integrated line driver for CPE application
Data Brief
Features
Fully Integrated AFE and Line Driver for ADSL Overall 12 bit resolution, 1.1MHz signal bandwidth 8.8 MS/s ADC 8.8 MS/s DAC Differential analog I/O Accurate continuous-time channel filtering 5 & 4 order tunable continuous-time receive and transmit filters respectively Support for multiple ADSL standards: ANSI T1.413 Issue 2 ITU G.992.1 (G.dmt) Annex A Annex B (ADSL over ISDN)
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TQFP100
Description
The MTC20174 Analog Front End (AFE) with integrated line driver is designed for DMT based ADSL CPE modems compliant with ANSI T1.413 issue 2, ITU G.992.1 (G.dmt) and ITU G.992.2 (G.lite), for Annex A, B and C. It is intended to be used with the MTC20166 DMT modem and ATM framer as part of the MTK20170 chipset, but may also be used to support other ADSL signal processors. It includes the following parts:
A 12-bit 8.8Msamples/s DAC A 13-bit 8.8Msamples/s ADC Tunable low-pass and high-pass filters Low-noise PGAs A TX Pre-Amplifier A TX Line-Driver A fully integrated DCXO A PLL-based frequency doubler A filter tuning circuit A dying gasp circuit A digital module for control, test and interface
Annex C (ADSL over ISDN SBM/DBM/G.dmt) ITU G.992.2 (G.lite)
Highest performance: Operation up to 18 kft (26 AWG) More than 8 Mbps downstream and 832 Kbps upstream up to 8 kft (26 AWG) More than 3 Mbps downstream and 760 kbps upstream up to 12 kft (26 AWG) 100 pin TQFP package allows high-density board design
Power dissipation of 900mW at 25C, typical TQFP100 package
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The following figure provides a graphical representation of the MTC20174 functional blocks with an additional separation in RX and TX path. The analog and digital part have separated 3.3V power supplies. In addition some part of the analog section of the MTC20174 has a power supply of 5V. The typical total power consumption of the MTC20174 is 900mW for 12dBm of line power (full operation) at 250C.
The MTC20174 is an ADSL Analog Front-End (AFE) with integrated Line-Driver for ATU-R applications offering Annex A, B and C.
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MTC20174
Ordering information
Ordering information
Table 1. Order codes
Package TQFP100 TQFP100 Temperature 0 to 70C 0 to 70C Packing Tray Tape and reel
Part Number E-MTC20174(1) MTC20174-TQ-C1TR
1. Ecopack
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Revision history
ST20138
Revision history
Table 2.
Date 15-Sep-2004 27-Mar-2007
Document revision history
Revision 1 2 Initial release. Updated the ordering information of ST70138 and MTC20174. Updated the description and block diagram of Unicorn II (cover page). Changes
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ST20138
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