ADI AD7849BR

Напряжение - буферизованноеSPI±14.25V ~ 15.75V-40°C ~ 85°C

Overview

The AD7849BR is a 14-bit/16-bit serial input multiplying DAC. The DAC architecture ensures excellent differential linearity performance, and monotonicity is guaranteed to 14 bits for the A grade and to 16 bits for all other grades over the specified temperature ranges. During power-up and power-down sequences (when the supply voltages are changing), the VOUT pin is clamped to 0 V via a low impedance path. To prevent the output of A3 being shorted to 0 V during this time, transmission gate G1 is also opened. These conditions are maintained until the power supplies stabilize and a valid word is written to the DAC register. At this time, G2 opens and G1 closes. Both transmission gates are also externally controllable via the Reset In (RST IN) control input. For instance, if the RST IN input is driven from a battery supervisor chip, then on power-off or during a brown out, the RST IN input will be driven low to open G1 and close G2. The DAC must be reloaded, with RST IN high, to reenable the output. Conversely, the on-chip voltage detector output (RST OUT) is also available to the user to control other parts of the system.

The part is available in a 20-pin DIP and 20-pin SOIC package.

Features

Applications

• Data Distribution System
• Digital Potentiometer
• Software Radio
• Wireless infrastructure:
• WCDMA, CDMA2000, TD-SCDMA, WiMAX
• Wideband communications:
• LMDS/MMDS, point-to-point
• Instrumentation:
• RF signal generators, arbitrary waveform generators
• Mobile Communications