AD1861

a FEATURES 110 dB SNR Fast Settling Permits 16؋ Oversampling ؎3 V Output Optional Trim Allows Super-Linear Performance ؎5 V Operation 16-Pin Plastic DIP and SOIC Packages Pin-Compatible with AD1856 & AD1860 Audio DACs 2s Complement, Serial Input APPLICATIONS High-End Compact Disc Players Digital Audio Amplifiers DAT Recorders and Players Synthesizers and Keyboards PRODUCT DESCRIPTION –VS DGND +VL NC CLK LE DATA NC 1 2 3 4 5 6 7 8 16-Bit/18-Bit, 16 ؋ FS PCM Audio DACs AD1851/AD1861 FUNCTIONAL BLOCK DIAGRAM LATCH DAC 16 15 SERIAL INPUT REGISTER 14 IOUT 13 12 11 10 +VS TRIM MSB ADJ IOUT AGND SJ RF VOUT CONTROL LOGIC AD1851/ AD1861 NC = NO CONNECT 9 The AD1851/AD1861 is a monolithic PCM audio DAC. The AD1851 is a 16-bit device, while the AD1861 is an 18-bit device. Each device provides a voltage output amplifier, DAC, serial-to-parallel register and voltage reference. The digital portion of the AD1851/AD1861 is fabricated with CMOS logic elements that are provided by Analog Devices’ 2 µm ABCMOS process. The analog portion of the AD1851/AD1861 is fabricated with bipolar and MOS devices as well as thin-film resistors. This combination of circuit elements, as well as careful design and layout techniques, results in high performance audio playback. Laser-trimming of the linearity error affords low total harmonic distortion. An optional linearity trim pin is provided to allow residual differential linearity error at midscale to be eliminated. This feature is particularly valuable...