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| MAX555 Evaluation Kit _______________General Description The MAX555 evaluation kit (EV kit) demonstrates the operation of the MAX555 12-bit, 300MHz DAC with ECL-compatible data and clock inputs. By supplying power, digital bit inputs, and a differential clock, the kit allows for quick evaluation of the MAX555's AC performance. A MAX555 is included in the EV kit. ____________________________Features o Fast and Easy Performance Testing o Optimized PC Board Layout o SMA Connectors for All Digital Input and Output Voltages o Includes 50 Termination Resistors o On-Board Voltage Reference and VTT Generators Evaluates: MAX555 ______________Ordering Information PART MAX555EVKIT TEMP. RANGE 0C to +70C ________________________________________________________________________EV Kit ________________________________________________________________ Maxim Integrated Products 1 Call toll free 1-800-998-8800 for literature. MAX555 Evaluation Kit Evaluates: MAX555 ____________________Component List DESIGNATION C1-C10, C14-C18, C25, C26, C28 C19, C20 C21 C22 C23, C24 J1-J16 R1-R13, R20, R21 R14 R16 R17 R18 R19 U1 U2 U3 U4 QTY 18 2 1 1 2 16 15 1 1 1 1 1 1 1 1 1 DESCRIPTION 0.1F ceramic capacitors 10F tantalum capacitors, surface-mount 22F tantalum capacitor, surface-mount 47F tantalum capacitor, surface-mount 0.01F ceramic capacitors SMA connectors 51, 5% resistors 121, 1% resistor 82.5, 1% resistor 182, 1% resistor 68.1, 1% resistor 100 trim pot MAX555CQK LM337T MX580KH MAX410CPA _______________Detailed Description Digital Inputs The MAX555 EV kit board has high-frequency SMA connectors for the differential-clock and DAC data inputs. Each of these inputs has on-board 50 pull-down resistors to -2V. The -2V supply is regulated down from the -5.2V power supply, as shown in Figure 1. The MAX555 is set-up in the clocked mode (BYPASS = logic 0) on the EV kit board, with a 50 resistor (R13) connected to -2V. Clocked-mode operation is recommended for all high-speed applications. Removing R13 and connecting the BYPASS pin of the MAX555 to ground will select the transparent data mode, as described in the MAX555 data sheet. DAC Outputs The MAX555 has complementary voltage outputs, VOUT and VOUT. Both have 50 output impedances and must be terminated correctly to achieve the best performance. Applications requiring a single-ended output should use VOUT, since it is trimmed to higher accuracy than VOUT. Both VOUT and VOUT should always be terminated with 50 to ground for best performance. An alternative way to achieve a single-ended output is to drive a balun transformer with both VOUT and VOUT. The balun connection will reduce the even-order harmonics in the output. _________________________Quick Start 1) Connect the power supply to the MAX555 EV kit. The power-supply input pads are located along the top edge of the board. The board requires a power supply that provides +5V and -5.2V with a common ground. 2) Connect 50 cables to the VOUT and VOUT outputs with proper terminations. 3) Connect a word generator to the data inputs (D0-D11) and the clock inputs. All of these inputs are 100k ECL compatible. 4) Turn on the power-supply and signal sources. 5) Observe the output waveforms on VOUT and VOUT. Power Supplies The EV kit board requires a -5.2V supply (at 425mA nominal) for the DAC and 50 terminations, and a +5V supply (at 12mA nominal) for the on-board reference circuit, and ground. DAC Reference Options The MAX555 uses an external +1V reference, which is supplied on the EV kit board using the circuit shown in Figure 1. This reference voltage can be adjusted to different values between 1.2V and 0.4V using potentiometer R19. The VREF value can be measured at the VREF pad. The MAX555 will typically achieve its best spurious performance with VREF values in the 0.6V to 0.8V range, as described in the MAX555 data sheet. Experimentation with different VREF values is recommended to maximize the AC performance in your application. 2 _______________________________________________________________________________________ MAX555 Evaluation Kit Evaluates: MAX555 J3 VREF TEST POINT JU2 +1VREF J5 38 39 J6 54 58 J7 59 60 J8 62 64 65 J9 67 D4 6 J10 7 8 J11 J15 J12 J16 J13 26 J14 C6 0.1F C5 0.1F 9 2 3 1 D3 D2 D1 D0 (LSB) CLK C27 OPEN C2 0.1F C1 0.1F 35 42 32 33 34 AVEE -5.2V J4 C3 0.1F 5 55 DVEE C4 0.1F VREF VREF/2 ROFFSET LOOPCRNT D11 (MSB) D10 D9 D8 D7 D6 D5 J1 17 VOUT 18 U1 MAX555 15 LGND 16 STAR GROUND AT PIN 15 13 VOUT ALTCOMPIB 14 J2 BYPASS (HS) 44 ALTCOMPC CLK LBIAS 50 AGND DGND 47 C7 0.1F -5.2V 28 C8 0.1F -5.2V 20 29 30 48 4 56 57 63 66 C9 0.1F C10 0.1F -5.2V R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 50 50 50 50 50 50 50 50 50 50 50 50 R20 R21 50 50 BYPASS = ANALOG GROUND = DIGITAL GROUND R13 50 -2V C20 10F C14 0.1F C15 0.1F C16 0.1F C17 0.1F C18 0.1F C19 10F Figure 1. MAX555 EV Kit Schematic Diagram _______________________________________________________________________________________ 3 MAX555 Evaluation Kit Evaluates: MAX555 -2V SUPPLY -5.2V +5V REFERENCE CIRCUIT C21 22F 3 R14 121 1% 2 IN OUT U2 LM337T C23 0.01F +VS U3 VOUT MX580KH GND C24 0.01F R19 100 R18 68.1 1% +5V -2V 1 ADJ R17 182 1% U4 2 C25 0.1F 7 6 3 MAX410 4 +1VREF C22 4.7F R16 82.5 1% C28 0.1F C26 0.1F -5.2V Figure 1. MAX555 EV Kit Schematic Diagram (continued) 4 _______________________________________________________________________________________ MAX555 Evaluation Kit Evaluates: MAX555 Figure 2. MAX555 EV Kit Component Placement Guide-- Component Side Figure 3. MAX555 EV Kit Component Placement Guide-- Back Side Figure 4. MAX555 EV Kit PC Board Layout--Component Side Figure 5. MAX555 EV Kit PC Board Layout--Layer 2 (Ground Layer) _______________________________________________________________________________________ 5 MAX555 Evaluation Kit Evaluates: MAX555 Figure 6. MAX555 EV Kit PC Board Layout--Layer 3 (Power Layer) Figure 7. MAX555 EV Kit PC Board Layout--Back Side 6 _______________________________________________________________________________________ MAX555 Evaluation Kit Evaluates: MAX555 _______________________________________________________________________________________ 7 MAX555 Evaluation Kit Evaluates: MAX555 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. 8 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1995 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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