SY89200/202U SY89200U SY89202U M9999-121604 SY89200U/202U C10-C19 - Datasheet Archive

 

Fanot w/ Three ÷1/÷2/÷4 Clock Divider Output Banks SY89200/202U Evaluation Board General Description

 

Ultra-Precision 1:8 LVDS and LVPECL Fanot w/ Three ÷1/÷2/÷4 Clock Divider Output Banks SY89200/202U SY89200/202U Evaluation Board General Description Features The SY89200U SY89200U and SY89202U SY89202U evaluation boards are designed for convenient setup and quick evaluation of the respective devices. They allow the user to evaluate the part over the full voltage-range without requiring any modifications to the board. The evaluation board standard configuration is ACcoupled for direct interface to a 50 compatible oscilloscope without split supplies. For applications that require a DC-coupled configuration, step-by-step instructions for modifying the board are included. · SY89200U SY89200U LVDS outputs · SY89202U SY89202U LVPECL outputs · Single +2.5V power supply (SY89200U SY89200U) · Single +2.5V or +3.3V power supply (SY89202U SY89202U) · AC-coupled configuration for ease-of-use · I/O interface includes on-board termination · Fully assembled and tested · Reconfigureable for DC-coupled operation Related Documentation · SY89200U SY89200U, Ultra-Precision 1:8 LVDS Fanout with Three ÷1/÷2/÷4 Clock Divider Output Banks Data Sheet · SY89202U SY89202U, Ultra-Precision 1:8 LVPECL Fanout with Three ÷1/÷2/÷4 Clock Divider Output Banks Data Sheet _ Evaluation Board SY89200U SY89200U AC-Coupled Evaluation Board December 2004 SY89202U SY89202U AC-Coupled Evaluation Board M9999-121604 M9999-121604 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. Evaluation Board Description The SY89200U SY89200U and SY89202U SY89202U share a common evaluation board. The individual evaluation boards are labeled to identify the specific device and the configuration, either AC- or DC-coupled configuration, for that board. The SY89200U SY89200U is an LVDS-output evaluation board and the SY89202U SY89202U is an LVPECLoutput evaluation board. The default configuration for the boards is the ACcoupled configuration and all boards are shipped with this configuration. The choice between two configurations offers the user flexibility in selecting the board that is right for his particular application. AC-Coupled Evaluation Board The AC-coupled configuration is suited to most customer applications and is preferred by the majority of users because of its ease-of-use. It requires only a single power supply of either +2.5V +5% for the SY89200U SY89200U and +2.5V +5% or +3.3V +10% for the SY89202U SY89202U and offers the most flexibility in interfacing to a variety of signal sources. The AC-coupling capacitors are supplied on-board for each input, making it unnecessary to vary the offset voltage or change any components on the board as the power supply voltage varies. The user needs only to supply a minimum input voltage swing and the bias voltage will automatically adjust the input to the correct level as the power supply voltage varies. December 2004 SY89200/202U SY89200/202U Evaluation Board SY89200U SY89200U DC-Coupled Evaluation Boards For DC-coupled operation, the board can be modified to use two power supplies in a "split-supply configuration." The term split-supply simply means the +2.5V supply that is split into a +1.2V and ­1.3V power supply configuration. This effectively offsets the board by +1.2V. The +1.2V offset in this twopower supply configuration then provides the correct terminations for the device by setting the ground potential on the board to be exactly 1.2 volts below the VCC supply. The VEE voltage is then set to ­1.3V so the device power pins still see a full 2.5V potential between VCC and VEE. SY89202U SY89202U DC-Coupled Boards For DC-coupled operation, the boards can be modified to use two power supplies in a "split-supply configuration". The term split-supply simply means the +3.3V supply is split into a +2V and ­1.3V, or for a +2.5V supply it is split into a +2V and ­0.5V power supply configuration. This effectively offsets the board by +2V. The +2V offset in this two-power supply configuration then provides the correct terminations for the device by setting the Ground potential on the board to be exactly 2 volts below the VCC supply. The VEE voltage is then set to ­1.3V for 3.3V devices or ­ 0.5V for 2.5V devices so the device power pins still see a full 3.3V or 2.5V potential between VCC and VEE. Step-by-step instructions for modifying an AC-coupled evaluation board for DC-coupled operation are supplied in the section "Modifying your AC-Coupled Board for DC-Coupled Operation." M9999-121604 M9999-121604 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89200U/202U SY89200U/202U Evaluation Board Evaluation Board SY89200U SY89200U AC-Coupled Evaluation Board Power Supply VCC GND VEE I/O 2.5 Volt System +2.5V 0V 0V AC-Coupled Input/AC-Coupled Output Table 1. SY89200U SY89200U AC-Coupled Evaluation Board Power Supply Connections December 2004 3 M9999-121604 M9999-121604 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89200U/202U SY89200U/202U Evaluation Board Evaluation Board SY89202U SY89202U AC-Coupled Evaluation Board Power Supply VCC GND VEE I/O 2.5 Volt System +2.5V 0V 0V AC-Coupled Input/AC-Coupled Output 3.3 Volt System +3.3V 0V 0V AC-Coupled Input/AC-Coupled Output Table 2. SY89202U SY89202U AC-Coupled Evaluation Board Power Supply Connection December 2004 4 M9999-121604 M9999-121604 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89200U/202U SY89200U/202U Evaluation Board Setting up the SY89202U SY89202U AC-Coupled Evaluation Board The following steps describe the procedure for setting up the LVPECL-output evaluation boards: 1. Set the voltage setting for a DC supply to be either 2.5V or 3.3V, depending on your application, and turn off the supply. 2. On the evaluation board short the GND terminal to the VEE terminal and connect them to the negative side of the DC power supply. 3. Connect the VCC terminal to the positive side of the DC power supply. 4. Turn on the power supply and verify that the power supply current is