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HI5741BIB Datasheet(PDF) 11 Page - Intersil Corporation |
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HI5741BIB Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 12 page 3-11 paths through the device can also cause one current source to change before another. In order to minimize this, the Intersil HI5741 employes an internal register, just prior to the current sources, which is updated on the clock edge. Lastly, the worst case glitch on traditional D/A converters usually occurs at the major transition (i.e., code 8191 to 8192). However, due to the split architecture of the HI5741, the glitch is moved to the 1023 to 1024 transition (and every subsequent 1024 code transitions thereafter). This split R/2R segmented current source architecture, which decreases the amount of current switching at any one time, makes the glitch practically constant over the entire output range. By making the glitch a constant size over the entire output range this effectively integrates this error out of the end application. In measuring the output glitch of the HI5741 the output is terminated into a 64 Ω load. The glitch is measured at any one of the current cell carry (code 1023 to 1024 transition or any multiple thereof) throughout the DACs output range. The glitch energy is calculated by measuring the area under the voltage-time curve. Figure 25 shows the area considered as glitch when changing the DAC output. Units are typically specified in picoVolt/seconds (pV/s). Applications Bipolar Applications To convert the output of the HI5741 to a bipolar 4V swing, the following applications circuit is recommended. The reference can only provide 125 µA of drive, so it must be buffered to create the bipolar offset current needed to generate the -2V output with all bits ‘off’. The output current must be converted to a voltage and then gained up and offset to produce the proper swing. Care must be taken to compensate for the voltage swing and error. Interfacing to the HSP45106 NCO-16 The HSP45106 is a 16-bit Numerically Controlled Oscillator (NCO). The HSP45106 can be used to generate various modulation schemes for Direct Digital Synthesis (DDS) applications. Figure 27 shows how to interface an HI5741 to the HSP45106. Definition of Specifications Integral Linearity Error, INL, is the measure of the worst case point that deviates from a best fit straight line of data values along the transfer curve. Differential Linearity Error, DNL, is the measure of the error in step size between adjacent codes along the converter’s transfer curve. Ideally, the step size is 1 LSB from one code to the next, and the deviation from 1 LSB is known as DNL. A DNL specification of greater than -1 LSB guarantees monotonicity. Feedthru, is the measure of the undesirable switching noise coupled to the output. Output Voltage Full Scale Settling Time, is the time required from the 50% point on the clock input for a full scale step to settle within an ±1/2 LSB error band. Output Voltage Small Scale Settling Time, is the time required from the 50% point on the clock input for a 100mV step to settle within an 1/2 LSB error band. This is used by applications reconstructing highly correlated signals such as sine waves with more than 5 points per cycle. Glitch Area, GE, is the switching transient appearing on the output during a code transition. It is measured as the area under the curve and expressed as a volt • time specification (typically pV-s). Differential Gain, ∆AV, is the gain error from an ideal sine wave with a normalized amplitude. Differential Phase, ∆Φ, is the phase error from an ideal sine wave. Signal to Noise Ratio, SNR, is the ratio of a fundamental to the noise floor of the analog output. The first 5 harmonics are ignored, and an output filter of 1/2 the clock frequency is used to eliminate alias products. (21) IOUT 100MHz LOW PASS FILTER SCOPE HI5741 64 Ω 50 Ω FIGURE 24. GLITCH TEST CIRCUIT FIGURE 25. MEASURING GLITCH ENERGY a (mV) t (ns) GLITCH ENERGY = ( a x t)/2 HI5741 REF OUT IOUT 1/ 2 CA2904 + - + - + - 50 Ω 5k Ω 1/ 2 CA2904 5k Ω 60 Ω 240 Ω 240 Ω HFA1100 VOUT 0.1 µF FIGURE 26. BIPOLAR OUTPUT CONFIGURATION (21) (26) HI5741 |
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