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DAC1203D160HW Arkusz danych(PDF) 6 Page - Integrated Device Technology |
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DAC1203D160HW Arkusz danych(HTML) 6 Page - Integrated Device Technology |
6 / 18 page DAC1203D160_3 © IDT 2012. All rights reserved. Product data sheet Rev. 03 — 2 July 2012 6 of 18 Integrated Device Technology DAC1203D160 Dual 12 bits DAC, up to 160 MHz, 2 x interpolating 7. Functional description The DAC1203D160 is a segmented architecture composed of a 7-bit thermometer sub-DAC and the remaining 5-bit in a binary weighted sub-DAC. The device produces two complementary current outputs on both channels, respectively pins IOUT/IOUTN and QOUT/QOUTN which need to be connected via a load resistor to the ground. Figure 3 shows the equivalent analog output circuit of one DAC, which consists of a parallel combination of PMOS current sources and associated switches for each segment. The cascode source configuration enables the increasing of the output impedance of the source and set to improve the dynamic performance of the DAC by introducing less distortion. Figure 4 shows the internal reference configuration. In this case the bias current is given by the output of the internal regulator connected to the inverting input of the internal operational amplifiers, while external resistors RI and RQ are connected respectively to pins IVIRES and QVIRES. Thus the output current of the two DACs is typically fixed to 20 mA with an appropriate choice of these resistors. This configuration is optimal for temperature drift compensation because the band gap can be matched with the voltage on the feedback resistors. The relation between full-scale output current IO(fs) and the RI (RQ) is: RI 2048 VGAPOUT 82 IOFS ----------------------------------------- = The output current can also be adjusted by imposing an external reference voltage to the inverting input pin GAPOUT and disabling the internal band gap with pin GAPD set to HIGH. At a voltage lower than 1.2 V the current can be set at values lower than 20 mA. The input references at pins IVIRES and QVIRES may also be driven by separate reference voltages to independently adjust the two DAC currents. 014aaa545 AGND RL RL AGND IOUT/QOUT IOUTN/QOUTN DAC1203D160 014aaa546 QVIRES IVIRES GAPOUT AGND GAPD INTERNAL BAND GAP I DAC current sources array DAC1203D160 Q DAC current sources array RI RQ Fig 3. Equivalent analog output circuit Fig 4. Internal reference configuration |
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