AD766 Datasheet | Analog Devices

a Features Zero-Chip Interface to Digital Signal Processors plete DACPORT® On-Chip Voltage Reference Voltage and Current Outputs Serial, Twos-plement Input ؎3 V Output Sample Rates to 390 k SPS 94 d B Minimum Signal-to-Noise Ratio - 81 d B Maximum Total Harmonic Distortion 15-Bit Monotonicity ؎5 V to ؎12 V Operation 16-Pin Plastic and Ceramic Packages Available in mercial, Industrial, and Military Temperature Ranges APPLICATIONS Digital Signal Processing Noise Cancellation Radar Jamming Automatic Test Equipment Precision Industrial Equipment Waveform Generation 16-Bit DSP DACPORT AD766 FUNCTIONAL BLOCK DIAGRAM PRODUCT DESCRIPTION The AD766 16-bit DSP DACPORT provides a direct, threewire interface to the serial ports of popular DSP processors, including the ADSP-2101, TMS320CXX, and DSP56001. No additional “glue logic” is required. The AD766 is also plete, offering on-chip serial-to-parallel input format conversion, a 16-bit current-steering DAC, voltage reference, and a voltage output op amp. The AD766 is fabricated in Analog Devices’ Bi MOS II mixed-signal process which provides bipolar transistors, MOS transistors, and thin-film resistors for precision analog circuits in addition to CMOS devices for logic. The design and layout of the AD766 have been optimized for ac performance and are responsible for its guaranteed and tested 94 d B signal-to-noise ratio to 20 k Hz and 79 d B SNR to 250 k Hz. Laser-trimming the AD766’s silicon chromium thinfilm resistors reduces total harmonic distortion below - 81 d B (at 1 k Hz), a specification also production tested. An optional linearity trim pin allows elimination of midscale differential linearity error for even lower THD with small signals. The AD766’s output amplifier provides a ± 3 V signal with a high slew rate, small glitch, and fast settling. The output amplifier is short circuit protected and can withstand indefinite shorts to ground. DACPORT is a registered trademark of Analog Devices, Inc. The serial...