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AD1866R Arkusz danych(PDF) 5 Page - Analog Devices |
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AD1866R Arkusz danych(HTML) 5 Page - Analog Devices |
5 / 12 page TOTAL HARMONIC DISTORTION + NOISE Total harmonic distortion plus noise (THD+N) is defined as the ratio of the square root of the sum of the squares of the am- plitudes of the harmonics and noise to the amplitude of the fun- damental input frequency. It is usually expressed in percent (%) or decibels (dB). D-RANGE DISTORTION (EIAJ SPECIFICATION) D-Range distortion is the ratio of the amplitude of the signal at an amplitude of –60 dB to the amplitude of the distortion plus noise. In this case, an A-weight filter is used. The value speci- fied for D-range performance is the ratio measured plus 60 dB. SIGNAL-TO-NOISE RATIO The signal-to-noise ratio is defined as the ratio of the amplitude of the output when a full-scale output is present to the ampli- tude of the output with no signal present. It is expressed in decibels (dB) and measured using an A-weight filter. GAIN LINEARITY Gain linearity is a measure of the deviation of the actual output amplitude from the ideal output amplitude. It is determined by measuring the amplitude of the output signal as the amplitude of that output signal is digitally reduced to a lower level. A per- fect D/A converter exhibits no difference between the ideal and actual amplitudes. Gain linearity is expressed in decibels (dB). MIDSCALE ERROR Midscale error, or bipolar zero error, is the deviation of the ac- tual analog output from a voltage at the bias pin when the twos complement input code representing midscale is loaded in the DAC. Midscale error is expressed in mV. FUNCTIONAL DESCRIPTION The AD1866 is a complete, monolithic dual 16-bit digital audio DAC which runs off a single +5 volt supply. As shown in the block diagram, each channel contains a voltage reference, a 16-bit serial-to-parallel input register, a 16-bit input latch, a 16-bit DAC, and an output amplifier. The voltage reference section provides a reference voltage and a false ground voltage for each channel. The low noise bandgap circuits produce reference voltages that are unaffected by changes in temperature, time, and power supply. The input registers are fabricated with CMOS logic gates. These gates allow high switching speeds and low power con- sumption, contributing to the fast digital timing, the low glitch and low power dissipation of the AD1866. LL DL CLK DR LR DGND VL NRL AGND NRR VS 1 2 3 4 5 6 7 8 9 10 12 13 14 15 11 16 AD1866 16-BIT DAC 16-BIT DAC 16-BIT SERIAL REGISTER 16-BIT SERIAL REGISTER VBL VOR VS VBR V REF V REF VOL AD1866 Functional Block Diagram The 16-bit DAC uses a combination of segmentation and R-2R architecture to achieve good integral and differential linearity. The resistors which form the ladder structure are fabricated with silicon-chromium thin film. Laser trimming of these resis- tors further reduces linearity error, resulting in low output distortion. The output amplifier uses both MOS and bipolar devices and incorporates an NPN class A output stage. It is designed to pro- duce high slew rate, low noise, low distortion, and optimal fre- quency response. REV. 0 –5– Definition of Specifications–AD1866 |
Podobny numer części - AD1866R |
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Podobny opis - AD1866R |
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