DAC1218

Features:

*Linearity specified with zero and full-scale adjust only
*Logic inputs which meet TTL voltage level specs (1.4V
   logic threshold)
* Works with g10V referenceÐfull 4-quadrant
    multiplication
*All parts guaranteed 12-bit monotonic


Pinout




Specifications

Supply Voltage (V_CC).........................................17VDC
Voltage at Any Digital Input ......................V_CC to GND
Voltage at VREF Input .........................................±25V
Storage Temperature Range .............- 65 to +150
Package Dissipation at TAe25 (Note 3) ........500 mW
DC Voltage Applied to IOUT1 or IOUT2 ..- 100 mV to V_CC
(Note 4)
Lead Temp. (Soldering, 10 seconds).................. 300
ESD Susceptibility (Note 11) ................................800V 


Description

The DAC1218 and the DAC1219 are 12-bit binary, 4-quad-rant multiplying D to A converters. The linearity, differential non-linearity and monotonicity specifications for these converters are all guaranteed over temperature. In addition, these parameters are specified with standard zero and fullscale adjustment procedures as opposed to the impractical best fit straight line guarantee.

This level of precision of DAC1218 is achieved though the use of an advanced silicon-chromium (SiCr) R-2R resistor ladder network. This type of thin-film resistor eliminates the parasitic diode problems associated with diffused resistors and allows the applied reference voltage to range from b25V to 25V, independent of the logic supply voltage.

CMOS current switches and drive circuitry are used to achieve low power consumption (20 mW typical) and minimize output leakage current errors (10 nA maximum). Unique digital input circuitry maintains TTL compatible input threshold voltages over the full operating supply voltage range.

The DAC1218 and DAC1219 are direct replacements for the AD7541 series, AD7521 series, and AD7531 series with a significant improvement in the linearity specification. In applications where direct interface of the D to A converter to a microprocessor bus is desirable, the DAC1208 and DAC1230 series eliminate the need for additional interface logic.