Transceivers with Integrated Loopback

Transcription

1 Transceivers with Integrated Loopback General Description The SY58620/1L evaluation board is designed for easy evaluation of the SY58620L and SY58621L transceivers. The two transceivers are functionally compatible. The SY58620L has both a CML output receiver and transmitter, and the SY580621L has a CML output receiver and LVPECL output transmitter. Data sheets and support documentation can be found on Micrel s web site at: Features Single 3.3V supply voltage AC-coupled inputs and outputs Internal loopback mode Adjustable transmitter output swing Receiver with optional squelch function Small form factor 4mm x 4mm MLF package Related Documentation SY58620L, Precision 4.25Gbps CML Backplane Transceiver with Integrated Loopback SY58621L, Precision 4.25Gbps CML/LVPECL Backplane Transceiver with Integrated Loopback Evaluation Board MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc. Micrel Inc Fortune Drive San Jose, CA USA tel +1 (408) fax + 1 (408) January 2006 M B

2 Evaluation Board Description and Setting The evaluation board is a 4 layer board constructed with Roger s 4300 for the top layer substrate and with FR4 for all other layers. The inputs and outputs of the receiver and transmitter are AC-coupled and are accessible through SMA connectors. The board features a positive ground plane (VCC is the ground) that allows for DC-coupling. Receiver Setting Use J5 and J6 to connect a signal to the receiver s input. J1 and J2 are the receiver s outputs, to be connected to a 50Ω load. Install R10 to implement the squelch function. Installing R10 connects the output LDS to the input of /REN. By connecting LDS to /RXEN, output stability is maintained by disabling the output during a loss-ofsignal condition. If R10 is not installed (the squelch function will not be configured), remove the jumper from JP1 to enable the receiver or install the jumper on JP1 to disable the receiver. To perform an internal loopback, install a jumper on JP2 between pin 1 and pin 2. Refer to the data sheet for details. The LOSLVL sensitivity is set by creating a voltage divider between VCC and LOSLVL. Installing resistor (R8) creates a voltage divider between VCC and LOSLVL because LOSLVL is connected to VREF, which is an internal voltage source set at V CC -1.3V through a 2.8Ωk resistor. Transmitter Setting Use J3 and J4 to connect the input signals to the transmitter. J7 and J8 are the transmitter s outputs. Double check that R7 and R9 are not installed if the SY58620U is installed. If the SY58621L is installed, R7 and R9 must be installed. To disable the transmitter, install a jumper to JP3. To set the output swing to its minimum, install a jumper between pin 1 and 2 of JP4, and remove the jumper between pin 3 and 4. To set the output swing to its maximum, install a jumper between pin 3 and 4 of JP4, and remove the jumper between pin 1 and 2. To set the output swing to a value different from the maximum and minimum, install both jumpers on JP4 (one between pin 1 and pin 2, and the second between pin 3 and pin 4), and adjust VCTRL to a voltage between VCC and VBB using R2 and R3. If the transmitter is driven single-ended, install R10. Board Operation Connect the supply voltage (3.3V nominal) to TP3 (red). Connect ground to TP4 (black). January M B

3 Typical Performance Waveforms V CC = 3.3V, T A = 25 C, R L = 100Ω across the outputs (AC-coupled). January M B

4 Evaluation Board Schematic January M B

5 Bill of Materials Item Part Number Manufacturer Description Qty. C7-C21 VG0402G104KXQC Vishay (2) 0.1µF Ceramic Capacitor, Size C1-C3, C23 VJ0603Y683KXXA Vishay (2) 0.1µF Ceramic Capacitor, Size C4-C6, C22 ECSH0GY106R Panasonic (3) 10µF, Y, Tantalium Solid Electrolytic Capacitor 4 J1-J Johnson Components (4) SMA End Launch Receptacle Connector 8 JP1, JP3 TSW G-S Samtec (5) Header, 2 Positions 2 JP2 TSW G-S Samtec (5) Header, 3 Positions 1 JP4 TSW G-S Samtec (5) Header, 4 Positions 1 L1-L3 IMC 0805 RK 122 J 01 Vishay (2) 1.2µH Ferrite Bead Inductor 3 R1, R4-R6, R10 CRCW04020R00F Vishay (2) 0Ω Resistor 5 R7-R9 (1) CRCW F Vishay (2) 140Ω, 1% Resistor 2 R2, R3 CRCW F Vishay (2) 5.11kΩ, 5% Resistor 2 R8 CRCW F Vishay (2) 10kΩ, 1% Resistor 1 TP1, TP2, TP5, TP6 TSW G-S Samtec (5) Header, 1 Position 4 TP Keystone (6) Color Coded PCB Test Point 1 TP Keystone (6) Color Coded PCB Test point 1 U1 SY58620L Micrel (7) Transceiver 1 Notes: 1. Install with SY58621L only. Do not install with SY58620L. 2. Vishay: 3. Panasonic: 4. Johnson Components: 5. Samtec: 6. Keystone: 7. Micrel, Inc.: January M B

6 HBW Support Hotline: Support: Application Hints and Notes For application notes on high-speed termination on CML, LVDS, and LVPECL products, clock synthesizer products, SONET jitter measurement, and other High Bandwidth products, go to Micrel s website at: Once in Micrel s website, follow the steps below: 1. Click on Product Info. 2. In the Applications Information Box, choose Application Hints and Application Notes. MICREL, INC FORTUNE DRIVE SAN JOSE, CA USA TEL +1 (408) FAX +1 (408) WEB The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale Micrel, Incorporated. January M B