Maxim公司的 DS3170是 DS3-E3單片收發器，包括了DS3/E3成幀器和LIU，能以長度380米/1246英尺（DS3）或440米/1443英尺（E3）接口到75歐姆的同軸電纜，在接收端RX和發送端TX采用1:2變壓器， 器件內集成了DS3 (M23 或C-Bit)和 E3 (G.751 或G.832)成幀器，主要用在接入集線器，多服務接入平臺，ATM和幀中繼設備，路由器和交換，SONET/SDH ADM，PBX，PDH復接器/分路器，測試設備和綜合接入設備。本文介紹了DS3170主要特性，方框圖，DS3/E3線路卡框圖，DS3170DK 單片收發器評估板主要特性，電路圖和材料清單。
DS3170：DS3/E3 Single-Chip Transceiver
The DS3170 combines a DS3/E3 framer and an LIU (single-chip transceiver) to interface to a DS3/E3 physical copper line.
The DS3170 is a software-configured, DS3/E3, single-chip transceiver (SCT). The line interface unit (LIU) has independent receive and transmit paths. The receiver LIU block performs clock and data recovery from a B3ZS- or HDB3-coded AMI signal and monitors for loss of the incoming signal, and can be bypassed for direct clock and data input. The receiver LIU block optionally performs B3ZS/HDB3 decoding. The transmitter LIU drives standard pulse-shape waveforms onto 75Ω coaxial cable and can be bypassed for direct clock and data output. The jitter attenuator can be put in the transmit or receive data path when the LIU is enabled. Built-in DS3/E3 framers transmit and receive data in properly formatted C-bit DS3, M23 DS3, G.751 E3 or G.832 E3 data streams. Functions not used are powered down to reduce system power requirements.
DS3170主要特性：
Single-Chip Transceiver for DS3 and E3
Performs Receive Clock/Data Recovery and Transmit Waveshaping for DS3 and E3
Jitter Attenuator can be Placed Either in the Receive or Transmit Path
Interfaces to 75Ω Coaxial Cable at Lengths Up to 380 Meters or 1246 Feet (DS3), or 440 Meters or 1443 Feet (E3)
Uses 1:2 Transformers on Both Tx and Rx
On-Chip DS3 (M23 or C-Bit) and E3 (G.751 or G.832) Framer
Built-In HDLC Controller with 256-Byte FIFO for the Insertion/Extraction of DS3 PMDL, G.751 Sn Bit, and G.832 NR/GC Bytes
On-Chip BERT for PRBS and Repetitive Pattern Generation, Detection and Analysis
Large Performance-Monitoring Counters for Accumulation Intervals of At Least 1 Second
Flexible Overhead Insertion/Extraction Port for DS3, E3 Framers
Loopbacks Include Line, Diagnostic, Framer, Payload, and Analog with Capabilities to Insert AIS in the Directions Away from Loopback Directions
Integrated Clock Rate Adapter to Generate the Remaining Internally Required 44.736MHz (DS3) and 34.368MHz (E3) from a Single-Clock Reference Source
CLAD Reference Clock can be 44.736MHz, 34.368MHz, 77.76MHz, 51.84MHz, or 19.44MHz
Software Compatible with DS3171–DS3174 SCT Product Family
8-/16-Bit Parallel and Slave SPI Serial (≤ 10Mbps) Microprocessor Interface
Low-Power (0.5W) 3.3V Operation (5V Tolerant I/O)
100-Pin Small 11mm x 11mm (1mm) CSBGA
Industrial Temperature Operation: -40℃ to +85℃
IEEE 1149.1 JTAG Test Port
DS3170應用：
•Access Concentrators
• Multiservice Access Platforms
• ATM and Frame Relay Equipment
• Routers and Switches
• SONET/SDH ADM
• SONET/SDH Muxes
• PBXs
• Digital Cross Connect
• PDH Multiplexer/Demultiplexer
• Test Equipment
• Integrated Access Device (IAD)
圖1。DS3170方框圖
圖2。DS3170 DS3/E3端口的LIU外接框圖
圖3。DS3/E3線路卡框圖
DS3170DK 單片收發器設計套件
DS3/E3 Single-Chip Transceiver Design Kit
The DS3170DK is a fully integrated design kit for the DS3170 DS3/E3 single-chip transceiver (SCT). This design kit contains all the necessary circuitry to evaluate the DS3170 in all modes of operation. The design kit also includes an on-board microprocessor to run real-time code for further part evaluation.
DS3170DK 單片收發器設計套件主要特性：
Expedites New Designs by Eliminating First-Pass Prototyping
Demonstrates Key Functions of the DS3170 DS3/E3 Single-Chip Transceiver (SCT)
Includes DS3170 Single-Chip Transceiver (SCT), Transformers, 75Ω BNC, and Termination Passives
Interfaces with Any PC with an RS-232 Serial Interface
High Level Windows®-Based Software Provides Visual Access to All Registers
Software Controlled (Register) Mapped Configuration Switches Facilitate Real-Time Clock and Signal Routing
Precision Test Points for All Clocks and Signals
On-Board DS3 and E3 Crystal Oscillators for Stable Clock Generation
Easy-to-Read Silkscreen Labels Identify the Signals Associated with All Connectors, Jumpers, and LEDS
圖4。DS3170DK 單片收發器評估板外形圖
圖5。DS3170DK 單片收發器評估板元件布局圖
圖6。DS3170DK 單片收發器評估板電路圖（1）
圖7。DS3170DK 單片收發器評估板電路圖（2）
圖8。DS3170DK 單片收發器評估板電路圖（3）
圖9。DS3170DK 單片收發器評估板電路圖（4）
圖10。DS3170DK 單片收發器評估板電路圖（5）
圖11。DS3170DK 單片收發器評估板電路圖（6）
圖12。DS3170DK 單片收發器評估板電路圖（7）
圖13。DS3170DK 單片收發器評估板電路圖（8）
圖14。DS3170DK 單片收發器評估板電路圖（9）
圖15。DS3170DK 單片收發器評估板電路圖（10）
圖16。DS3170DK 單片收發器評估板電路圖（11）
圖17。DS3170DK 單片收發器評估板電路圖（12）
圖18。DS3170DK 單片收發器評估板電路圖（13）
圖19。DS3170DK 單片收發器評估板電路圖（14）
圖20。DS3170DK 單片收發器評估板電路圖（15）
圖21。DS3170DK 單片收發器評估板電路圖（16）
圖22。DS3170DK 單片收發器評估板電路圖（17）
圖23。DS3170DK 單片收發器評估板電路圖（18）
圖24。DS3170DK 單片收發器評估板電路圖（19）
DS3170DK 單片收發器評估板材料清單（BOM）：
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