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MAX5891EVKIT Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX5891EVKIT Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 14 page Power Supplies The EV kits can operate from a single 1.8V power sup- ply connected to the DVDD1 and AVDD1 input power pads, and a single 3.3V power supply connected to the DVDD2, AVDD2, and VDD_CK input power pads for simple operation. However, five separate power sup- plies are recommended to optimize dynamic perfor- mance. The EV kit PCB layout is divided into three sec- tions: digital, analog, and clock. Using separate power supplies for each section reduces noise and improves the integrity of the analog output signal. When using separate power supplies connect a 1.8V power supply across the DVDD1 and DGND pads and a 3.3V power supply across the DVDD2 and DGND pads (digital). Connect a 1.8V power supply across the AVDD1 and the AGND pads and a 3.3V power supply across the AVDD2 and the AGND pads (analog). Connect a 3.3V power supply across the VDD_CK and the CGND pads (clock). LVDS Digital Input Data The MAX5889/MAX5890/MAX5891 EV kits provide two 0.1in 2 x 20 headers (J1, J2) to interface an LVDS pat- tern generator to the EV kit. The header data pins labeled on the MAX5889/MAX5890/MAX5891 EV kit PCB are aligned with the MAX5891 DAC data input pins. See Table 1 to align the MAX5890 and MAX5889 input data bits from the pattern generator to the corre- sponding data pins on headers J1 and J2. The input data is latched on the rising edge of the clock signal. Clock Signal The MAX5889/MAX5890/MAX5891 operate with a dif- ferential clock input signal. However, the EV kit boards only require an external single-ended clock signal con- nected to the CLK SMA connector. The EV kit features circuitry that converts a single-ended clock signal to a differential clock signal. The clock signal should be a low-jitter sine or square wave. A minimum signal power amplitude of +8dBm is recommended to drive the clock input. The DACs accept a clock input frequency range of 1MHz to 600MHz. Reference Voltage The MAX5889/MAX5890/MAX5891 DACs require a ref- erence voltage to set the full-scale output current of the DAC. The MAX5889/MAX5890/MAX5891 integrate a sta- ble on-chip bandgap reference of 1.2V that is selected by default during initial power-up. An external voltage reference can be connected to test point TP1 to over- drive the internal voltage reference. The EV kit circuit also features an on-board, external 1.25V reference (U2, MAX6161) that can be used to overdrive the internal voltage reference. U2 has a tighter voltage output toler- ance and is less susceptible to temperature variations. See Table 2 to select the voltage reference source. Full-Scale Output Current The MAX5889/MAX5890/MAX5891 require an external resistor to set the full-scale output current. The EV kit full- scale current is set to 20mA with resistor R4. Replace resistor R4 to adjust the full-scale output current. Refer to the Reference Architecture and Operation section in the MAX5889/MAX5890/MAX5891 corresponding IC data sheets to select different values for resistor R4. Outputs To achieve the best dynamic performance, the MAX5889/MAX5890/MAX5891 outputs are configured for differential current mode. The resistor and trans- former network at the DAC output is designed to con- vert the differential current to a single-ended voltage signal with a 50 Ω output impedance. When the OUT- PUT connector is terminated with a 50 Ω external load, the full-scale output signal level equals -2dBm. To evaluate the converter’s single-ended outputs, remove transformer T1. Probe the single-ended signals at the OUTIP and OUTIN SMA connectors (must be installed). In single-ended configuration the DAC output signal amplitude is equal to 1VP-P at each of the outputs. MAX5889/MAX5890/MAX5891 Evaluation Kits _______________________________________________________________________________________ 5 SHUNT POSITION JU2 JU3 REFIO PIN CONNECTION EV KIT FUNCTION Not installed Not installed Open (REFIO becomes the output of the internal bandgap reference) Internal 1.2V reference enabled or connect an external reference to TP1 Installed* Installed Connected to U2 (MAX6161) U2 provides a precise 1.25V voltage reference Table 2. Reference Voltage Source (JU2 and JU3) *If jumper JU2 is installed, jumper JU3 must be installed. |
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