AD1864P

The AD1864P is one member of the AD1864 series.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.

Features of the AD1864P are:(1)dual serial input, voltage output DACs; (2)no external components required; (3)operates at 8*oversampling per channel; (4)±5 V to ±12 V operation; (5)cophased outputs; (6)115 dB channel separation; (7)±0.3% interchannel gain matching; (8)0.0017% THD+N.The AD1864 was designed to balance two sets of opposing requirements, channel separation and DAC matching.High channel separation is the result of careful layout techniques.The AD1864 is a complete, monolithic, dual 18-bit audio DAC.No external components are required for operation. As shown in the block diagram, each chip contains two voltage references,two output amplifiers, two 18-bit serial input registers and two 18-bit DACs.

The absolute maximum ratings of the AD1864P can be summarized as:(1)Vl to DGND:0 to 13.2V;(2)VS to AGND:0 V to 13.2 V;(3)VL to DGND:13.2 V to 0 V;(4)VS to AGND:13.2 V to 0 V;(5)Soldering (10 sec) :+300°C.Stresses above those listed under absolute maximum ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum ratings for extended periods may effect device reliability.The midscale matching specification indicates how closely the amplitudes of the output signals of the two channels match when the twos complement input code representing half scale is loaded into the input register of both channels. It is expressed in mV and is measured with half-scale output signals.