深圳市中立信电子科技有限公司

AD7849BRZ

数模转换器- DAC Serial Input 14B/16B Serial Input,  14-Bit/16-Bit DAC

GENERAL DESCRIPTION AD7849BRZ

The AD7849 is a 14-bit/16-bit serial input multiplying digitalto-analog

converter (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 from 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 (RSTIN) control input. For instance, if

the RSTIN input is driven from a battery supervisor chip, then

at power-off or during a brown out, the RSTIN input is driven

low to open G1 and close G2. The DAC must be reloaded, with

RSTIN high, to reenable the output. Conversely, the on-chip

voltage detector output (RSTOUT) is also available to the user

to control other parts of the system. 

FEATURES AD7849BRZ

14-bit/16-bit multiplying DAC

Guaranteed monotonicity

Output control on power-up and power-down internal or

external control

Versatile serial interface

DAC clears to 0 V in both unipolar and bipolar output ranges

APPLICATIONS AD7849BRZ

Industrial process controls

PC analog I/O boards

Instrumentation