AD5449 Datasheet | Analog Devices

Dual 8-,10-,12-Bit High Bandwidth Multiplying DACs with Serial Interface AD5429/AD5439/AD5449 Features 10 MHz multiplying bandwidth 50 MHz serial interface 2.5 V to 5.5 V supply operation ±10 V reference input Pin patible 8-, 10-, and 12-bit DACs Extended temperature range: - 40°C to +125°C 16-lead TSSOP package Guaranteed monotonic Power-on reset Daisy-chain mode Readback function 0.5 µA typical current consumption FUNCTIONAL BLOCK DIAGRAM VREFA AD5429/AD5439/AD5449 VDD SYNC SCLK SDIN SDO CLR INPUT REGISTER LDAC DAC REGISTER SHIFT REGISTER INPUT REGISTER DAC REGISTER 8-/10-/12-BIT R-2R DAC A RFB R RFBA IOUT1A IOUT2A POWER-ON RESET 8-/10-/12-BIT R-2R DAC B IOUT1B IOUT2B RFBB 04464-0-001 RFB R LDAC VREFB Figure 1. APPLICATIONS Portable battery-powered applications Waveform generators Analog processing Instrumentation applications Programmable amplifiers and attenuators Digitally controlled calibration Programmable filters and oscillators posite video Ultrasound Gain, offset, and voltage trimming GENERAL DESCRIPTION The AD5429/AD5439/AD54491 are CMOS 8-, 10-, and 12-bit dual-channel current output digital-to-analog converters, respectively. These devices operate from a 2.5 V to 5.5 V power supply, making them suited to battery-powered and other applications. The applied external reference input voltage (VREF) determines the full-scale output current. An integrated feedback resistor (RFB) provides temperature tracking and full-scale voltage output when bined with an external current-to-voltage precision amplifier. These DACs utilize a double-buffered, 3-wire serial interface that is patible with SPI®, QSPI™, MICROWIRE™, and most DSP interface standards. In addition, a serial data out pin (SDO) allows daisy-chaining when multiple packages are used. Data readback allows the user to read the contents of the DAC register via the SDO pin. On power-up, the internal shift register and latches are filled with zeros and the DAC outputs are at zero scale....