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| 19-1220; Rev 0; 1/99 MAX3691 Evaluation Kit General Description The MAX3691 evaluation kit (EV kit) simplifies evaluation of the MAX3691 622Mbps, SDH/SONET 4:1 serializer. This EV kit requires a single +3.3V supply and includes the external components necessary to observe the PECL serial-data output on a 50 input oscilloscope. The serial-data output termination can be modified easily to suit other logic interfaces, such as 3.3V PECL, high impedance, or ECL inputs. To evaluate the MAX3691's basic functioning, connect the board directly to the outputs of an LVDS device (such as an overheadgeneration circuit) or to a signal generator. ____________________________Features o Single +3.3V Supply o Output Terminated for Interfacing with a 50 Oscilloscope Input o Fully Tested and Assembled Evaluates: MAX3691 Component List DESIGNATION C1 C2 C3, C5, C7, C10, C12, C15, C18, C19, C20 C4, C6, C8, C9, C11, C13, C14, C16 JP1 L1, L3, C17 L2, L4, L5 R1 R2, R6 R3, R7 R4, R8 R5, R9 R10 RCLK+, RCLK-, PCLKI+, PCLKI-, PD0+, PD0-, PD1+, PD1-, PD2+, PD2-, PD3+, PD3-, SDO+, SDO-, PCLKO+, PCLKOU1 None QTY 1 1 9 DESCRIPTION 33F, 16V tantalum capacitor AVX TAJC336M016 or Sprague 293D336X0016D 1F ceramic capacitor 0.1F ceramic capacitors PART MAX3691EVKIT-SO Ordering Information TEMP. RANGE -40C to +85C BOARD TYPE Surface Mount 8 1 3 3 1 2 2 2 2 1 100pF ceramic capacitors SUPPLIER 2-pin header (0.1" centers) 0 resistors 56nH inductors Coilcraft 0805HS-560TKBC 1.5 1% resistor , 24 5% resistors , 27 5% resistors , 130 5% resistors , 220 5% resistors , 24.9k 1% resistor , Component Suppliers PHONE FAX AVX 803-946-0690 803-626-3123 Coilcraft 847-639-6400 847-639-1469 Sprague 603-224-1961 603-224-1430 Note: Please indicate that you are using the MAX3691 when contacting these component suppliers. 16 SMA PC edge-mount connectors 1 1 MAX3691ECJ 32-pin TQFP MAX3691 data sheet ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. MAX3691 Evaluation Kit Evaluates: MAX3691 Detailed Description The MAX3691 evaluation kit (EV kit) operates from a single +3.3V supply and includes the external components necessary to observe the PECL serial-data output on a 50 input oscilloscope. Each MAX3691 LVDS input (PCLKI+, PCLKI-, RCLK+, RCLK-, PD_+, and PD_-) is internally terminated with a 100differential input resistance. Ensure that LVDS devices driving these inputs are not redundantly terminated. LVDS parallel-clock outputs (PCLKO+, PCLKO-) must be differentially terminated with 100 When terminating . these outputs into 50 loads, use AC coupling (see the section Connecting Parallel-Clock LVDS Outputs to 50 Input Oscilloscopes). The EV kit serial-data output (SDO+, SDO-) termination network allows the outputs to be connected directly to a high-speed oscilloscope's 50 input. This termination provides the serial data outputs with a Thevenin equivalent of 50to VCC - 2V when connected to a 50load. This provides a 2-times output signal attenuation. If only one of the serial data outputs is connected to an oscilloscope, ensure that the other is still properly terminated. Keep in mind that the resistor networks at each output provide proper termination only when they are terminated through 50to ground. See the Alternative PECL Output Termination section for other logic interfaces. Applications Information Alternative PECL Output Termination Alternative PECL output termination methods can be used for different logic interfaces as long as they provide a DC Thevenin equivalent of 50to VCC - 2V. For example, to interface SDO+ with a PECL or highimpedance input, short resistors R2 and R3, and replace R5 with an 82resistor. To interface SDO+ with ECL input test equipment, which is internally terminated with 50 -2V, take the following steps: to 1) 2) 3) Remove R4 and R5. Short R2 and R3. Place a bias-T in series between the MAX3691 and the test equipment. Connect the bias-T's RF and DC terminals to the SDO+ output and the RF terminal to the test equipment's ECL input. Then connect the DC terminal to a VCC - 2V termination voltage through a 50 resistor. Connecting Parallel-Clock LVDS Outputs to 50Input Oscilloscopes To monitor the parallel-clock LVDS signals (PCLK0+, PCLK0-) on a 50input oscilloscope, place a capacitor or DC block in series with each output and the instrument input. Do not connect MAX3691 outputs directly to 50inputs or terminations to ground. Choose a coupling capacitor (0.1F recommended) large enough in value to prevent pattern-dependent distortion of the output signal. Table 1. Jumpers and Test Points NAME JP1 TYPE 2 pin DESCRIPTION Disables the loop filter Jumper locations (can be cut open if necessary) NORMAL POSITION Open JP3-JP7 2 pin Shorted 2 _______________________________________________________________________________________ MAX3691 Evaluation Kit Evaluates: MAX3691 JP1 FILTER DISABLE R10 24.9k, 1% JP2 VCCPLL VCCVCO R2 24 R3 27 SD0+ SMA C17 SHORT 24 23 22 21 20 19 18 17 GND FIL+ FILGND GND GND VCC VCC +3.3V 16 15 14 13 12 11 10 9 +3.3V C19 0.1F PCLKO+ SMA PD3SMA PCLKOSMA PD0SMA PD3+ SMA JP3 L1 SHORT VCCVCO PD1+ SMA PD2SMA JP4 L2 56nH VCCDIG C5 0.1F PD1SMA PD2+ SMA JP5 L3 SHORT VCCPLL C7 0.1F JP6 3.3V C1 33F 16V 1 2 C2 1F JP7 L5 56nH C10 0.1F C11 100pF VCCOUTB L4 56nH VCCOUTA C8 100pF C9 100pF C6 100pF C3 0.1F C4 100pF VCCOUTB VCCOUTA R8 130 R9 220 C18 0.1F VCCOUTB R6 24 R7 27 SD0SMA R4 130 R5 220 C16 100pF RCLK+ SMA C15 0.1F RCLKSMA VCCPLL VCCDIG PCLKI+ SMA R1 1.5k 1% 25 26 27 28 29 30 31 32 GND RCLK+ RCLKVCC VCC PCLKI+ PCLKIGND PD0+ PD1+ PD2+ PD3+ 7 PD0PD1PD2PD38 VCC SDO+ U1 MAX3691 SDOVCC VCC PCLKO+ PCLKOGND 1 PCLKISMA SMA PD0+ 2 3 4 5 6 GND NOTE: ALL SMAs ARE INSTALLED. R10-R13 ARE OPEN. C12 0.1F C13 100pF C14 100pF Figure 1. MAX3691 EV Kit Schematic _______________________________________________________________________________________ 3 MAX3691 Evaluation Kit Evaluates: MAX3691 1.0" 1.0" Figure 2. MAX3691 EV Kit Component Placement Guide-- Top Silk Screen Figure 3. MAX3691 EV Kit PC Board Layout--Component Side 4 _______________________________________________________________________________________ MAX3691 Evaluation Kit Evaluates: MAX3691 1.0" 1.0" Figure 4. MAX3691 EV Kit PC Board Layout--Solder Side Figure 5. MAX3691 EV Kit PC Board Layout--GND Plane _______________________________________________________________________________________ 5 MAX3691 Evaluation Kit Evaluates: MAX3691 1.0" Figure 6. MAX3691 EV Kit PC Board Layout--Power Plane Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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