AD668

a FEATURES Ultrahigh Speed: Current Settling to 1 LSB in 90 ns for a Full-Scale Change in Digital Input. Voltage Settling to 1 LSB in 120 ns for a Full-Scale Change in Analog Input 15 MHz Reference Bandwidth Monotonicity Guaranteed over Temperature 10.24 mA Current Output or 1.024 V Voltage Output Integral and Differential Linearity Guaranteed over Temperature 0.3" “Skinny DIP” Packaging MIL-STD-883 Compliant Versions Available 12-Bit Ultrahigh Speed Multiplying D/A Converter AD668 FUNCTIONAL BLOCK DIAGRAM PRODUCT DESCRIPTION The AD668 is an ultrahigh speed, 12-bit, multiplying digital-toanalog converter, providing outstanding accuracy and speed performance in responding to both analog and digital inputs. The AD668 provides a level of performance and functionality in a monolithic device that exceeds that of many contemporary hybrid devices. The part is fabricated using Analog Devices’ Complementary Bipolar (CB) Process, which features vertical NPN and PNP devices on the same chip without the use of dielectric isolation. The AD668’s design capitalizes on this proprietary process in combination with standard low impedance circuit techniques to provide its unique combination of speed and accuracy in a monolithic part. The wideband reference input is buffered by a high gain, closed loop reference amplifier. The reference input is essentially a 1 V, high impedance input, but trimmed resistive dividers are provided to readily accommodate 5 V and 1.25 V references. The reference ...