AD1865 Datasheet | Analog Devices

FEATURES Dual Serial Input, Voltage Output DACs No External ponents Required 110 d B SNR 0.003% THD+N Operates at 16 ؋ Oversampling per Channel ؎5 Volt Operation Cophased Outputs 116 d B Channel Separation Pin patible with AD1864 DIP or SOIC Packaging APPLICATIONS Multichannel Audio Applications pact 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 plete Dual 18-Bit 16 ؋ FS Audio DAC AD1865- FUNCTIONAL BLOCK DIAGRAM (DIP Package) 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 plete, dual 18-bit DAC offering excellent THD+N and SNR while requiring no external ponents. Two plete 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 provide extremely low total harmonic distortion. This architecture minimizes errors at major code transitions resulting in low output glitch and eliminating the need for an external deglitcher. When used in the current output mode, the AD1865 provides two ± 1 m A output signals. Each channel is equipped with a high performance output amplifier. These amplifiers achieve fast settling and high slew rate, producing ± 3 V signals at load currents up to 8 m A. Each output amplifier is short-circuit protected and can withstand...