AD1864

a FEATURES Dual Serial Input, Voltage Output DACs No External Components Required Operates at 8 ؋ Oversampling per Channel ؎5 V to ؎12 V Operation Cophased Outputs 115 dB Channel Separation ؎0.3% Interchannel Gain Matching 0.0017% THD+N APPLICATIONS Multichannel Audio Applications: Compact Disc Players Multivoice Keyboard Instruments DAT Players and Recorders Digital Mixing Consoles Multimedia Workstations PRODUCT DESCRIPTION –VS TRIM MSB I OUT AGND SJ RF VOUT +VL 1 2 REFERENCE 3 4 5 6 7 8 9 18-BIT LATCH 18-BIT D/A Complete Dual 18-Bit Audio DAC AD1864 DIP BLOCK DIAGRAMS AD1864 REFERENCE 22 MSB 21 I OUT 20 AGND 24 +VS 23 TRIM 19 SJ 18 R F – + – + 17 VOUT 16 –V L DL DR 10 LR 11 18-BIT D/A 18-BIT LATCH 15 14 LL 13 DGND CLK 12 The AD1864 is a complete dual 18-bit DAC offering excellent THD+N, 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 AD1864 chip includes CMOS logic elements, bipolar and MOS linear elements and laser-trimmed thin-film resistor elements, all fabricated on Analog Devices BiMOS II process. The DACs on the AD1864 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 lasertrimmed to provide extremely low total harmonic distortion. This arch...