AD1862

a FEATURES 120 dB Signal-to-Noise Ratio 102 dB D-Range Performance ؎ 1 dB Gain Linearity ؎ 1 mA Output Current 16-Pin DIP Package 0.0012% THD + N APPLICATIONS High Performance Compact Disc Players Digital Audio Amplifiers Synthesizer Keyboards Digital Mixing Consoles High Resolution Signal Processing –VS –VS 1 2 Ultralow Noise 20-Bit Audio DAC AD1862* FUNCTIONAL BLOCK DIAGRAM VOLTAGE REFERENCE 16 +VS 15 NR2 14 ADJ 13 NR1 INPUT & DIGITAL OFFSET 12 AGND 20-BIT DAC 11 IOUT 10 RF 9 DGND TRIM 3 +VL 4 CLK 5 LE 6 DATA 7 –VL 8 AD1862 PRODUCT DESCRIPTION The AD1862 is a monolithic 20-bit digital audio DAC. Each device provides a 20-bit DAC, 20-bit serial-to-parallel input register and voltage reference. The digital portion of the AD1862 is fabricated with CMOS logic elements that are provided by Analog Devices’ BiMOS II process. The analog portion of the AD1862 is fabricated with bipolar and MOS devices as well as thin-film resistors. New design, layout and packaging techniques all combine to produce extremely high performance audio playback. The design of the AD1862 incorporates a digital offset circuit which improves low-level distortion performance. Low stress packaging techniques are used to minimize stress-induced parametric shifts. Stress-sensitive circuit elements are located in die areas which are least affected by packaging stress. Laser-trimming of initial linearity error affords extremely low total harmonic distortion. Output glitch is also small, contributing to the o...