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¡¡¡¡The AD561 is an integrated circuit 10-bit digital-to-analog converter combined with a high stability voltage reference fabricated on a single monolithic chip. Using ten precision highspeed current-steering switches£¬ a control amplifier£¬ voltage reference£¬ and laser-trimmed thin-film SiCr resistor network£¬ the device produces a fast£¬ accurate analog output current. Laser trimmed output application resistors are also included to facilitate accurate£¬ stable current-to-voltage conversion; they are trimmed to 0.1% accuracy£¬ thus eliminating external trimmers in many situations. Several important technologies combine to make the AD561 the most accurate and most stable 10-bit DAC available. The low temperature coefficient£¬ high stability thin-film network is trimmed at the wafer level by a fine resolution laser system to 0.01% typical linearity. This results in an accuracy specification of ¡À1/4 LSB max for the K and T versions£¬ and 1/2 LSB max for the J and S versions. The AD561 also incorporates a low noise£¬ high stability subsurface zener diode to produce a reference voltage with excellent long term stability and temperature cycle characteristics£¬ which challenge the best discrete Zener references. A temperature compensation circuit is laser-trimmed to allow custom correction of the temperature coefficient of each device. This results in a typical full-scale temperature coefficient of 15 ppm/¡ãC; the TC is tested and guaranteed to 30 ppm/¡ãC max for the K and T versions£¬ 60 ppm/¡ãC max for the S£¬ and 80 ppm/¡ãC for the J.