AD1865

a FEATURES Dual Serial Input, Voltage Output DACs No External Components Required 110 dB SNR 0.003% THD+N Operates at 16 ؋ Oversampling per Channel ؎5 Volt Operation Cophased Outputs 116 dB Channel Separation Pin Compatible with AD1864 DIP or SOIC Packaging APPLICATIONS Multichannel Audio Applications Compact Disc Players Multivoice Keyboard Instruments DAT Players and Recorders Digital Mixing Consoles Multimedia Workstations PRODUCT DESCRIPTION –V S TRIM MSB IOUT AGND SJ RF VOUT +VL DR LR CLK 1 2 3 4 5 6 7 8 9 10 11 12 Complete Dual 18-Bit 16 ؋ FS Audio DAC AD1865* FUNCTIONAL BLOCK DIAGRAM (DIP Package) AD1865 REFERENCE REFERENCE 22 21 20 19 18 17 16 18-BIT LATCH 18-BIT D/A 18-BIT D/A 18-BIT LATCH 15 14 13 NC = NO CONNECT MSB IOUT AGND SJ RF VOUT NC DL LL DGND 24 +V S 23 TRIM The AD1865 is a complete, dual 18-bit DAC offering excellent THD+N and SNR while requiring no external components. Two complete signal channels are included. This results in cophased voltage or current output signals and eliminates the need for output demultiplexing circuitry. The monolithic AD1865 chip includes CMOS logic elements, bipolar and MOS linear elements and laser-trimmed thin-film resistor elements, all fabricated on Analog Devices’ ABCMOS process. The DACs on the AD1865 chip employ a partially segmented architecture. The first four MSBs of each DAC are segmented into 15 elements. The 14 LSBs are produced using standard R-2R techniques. Segment and R-2R resistors are laser trimmed to provid...