DAC1220 Datasheet

12-bit Binary Multiplying D/A Converter (discontinued)


Features, Applications
DAC1022 10-Bit Binary Multiplying D A Converter DAC1222 12-Bit Binary Multiplying D A Converter
DAC1022 10-Bit Binary Multiplying D A Converter DAC1222 12-Bit Binary Multiplying D A Converter

The DAC1020 and the DAC1220 are respectively 10 and 12-bit binary multiplying digital-to-analog converters A deposited thin film R-2R resistor ladder divides the reference current and provides the circuit with excellent temperature tracking characteristics 0002% C linearity error temperature coefficient maximum) The circuit uses CMOS current switches and drive circuitry to achieve low power consumption (30 mW max) and low output leakages (200 nA max) The digital inputs are compatible with DTL TTL logic levels as well as full CMOS logic level swings This part combined with an external amplifier and voltage reference can be used as a standard D A converter however it is also very attractive for multiplying applications (such as digitally controlled gain blocks) since its linearity error is essentially independent of the voltage reference All inputs are protected from damage due to static discharge by diode clamps V a and ground This part is available with (0 10%) and (0 20%) non-linearity guaranteed over temperature (note 1 of electrical characteristics) The DAC1020 DAC1021 and DAC1022 are direct replacements for the 10bit resolution AD7520 and AD7530 and equivalent to the AD7533 family The DAC1220 and DAC1222 are direct replacements for the 12-bit resolution AD7521 and AD7531 family


Linearity specified with zero and full-scale adjust only Non-linearity guaranteed over temperature Integrated thin film on CMOS structure or 12-bit resolution Low power dissipation mW 15V typ Accepts variable or fixed reference b25VsVREFs25V 4-quadrant multiplying capability Interfaces directly with DTL TTL and CMOS Fast settling time 500 ns typ Low feedthrough error LSB 100 kHz typ

Note Switches shown in digital high state
Temperature Range NonLinearity Package Outline Temperature Range NonLinearity DAC1021LCN DAC1022LCN
Note Devices may be ordered by either part number

If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications a to Gnd VREF to Gnd Digital Input Voltage Range DC Voltage at Pin 1 or Pin 2 (Note 3) Storage Temperature Range Lead Temperature (Soldering 10 sec ) Dual-In-Line Package (plastic) Dual-In-Line Package (ceramic) ESD Susceptibility (Note 4) 17V

C 800V VREF 25 C unless otherwise specified) DAC1021 DAC1022 Min Typ Max DAC1220 DAC1222 Min 12 Typ Max Bits Units

Resolution Linearity Error TMINkTAkTMAX 10V k VREF a 10V (Note 1) End Point Adjustment Only (See Linearity Error in Definition of Terms) DAC1022 DAC1222

10-Bit Parts 9-Bit Parts 8-Bit Parts Linearity Error Tempco Full-Scale Error Full-Scale Error Tempco Output Leakage Current IOUT 1 IOUT 2 Power Supply Sensitivity

TMINkTAkTMAX (Note 2) TMINsTAsTMAX All Digital Inputs Low All Digital Inputs High All Digital Inputs High a s16V (Note 2) (Figure e 100X from 95% FS All Digital Inputs Switched Simultaneously All Digital Inputs Low VREF e 20 Vp-p 100 kHz J Package (Note 4) N Package All Digital Inputs Low All Digital Inputs High All Digital Inputs Low All Digital Inputs High 0 005

VREF Input Resistance Full-Scale Current Settling Time
Digital Input Low Threshold High Threshold Digital Input Current
TMINsTAsTMAX Digital Input High Digital Input Low All Digital Inputs High All Digital Inputs Low
Supply Current Operating Power Supply Range

Note 1 VREF g 10V and VREF 1V A linearity error temperature coefficient 0002% FS for 45 C rise only guarantees 0 009% maximum change in linearity error For instance if the linearity error FS it could increase 70 C and the DAC will be no longer a 10-bit part Note however that the linearity error is specified over the device full temperature range which is a more stringent specification since it includes the linearity error temperature coefficient Note 2 Using internal feedback resistor as shown in Figure 3 Note 3 Both IOUT 1 and IOUT 2 must go to ground or the virtual ground of an operational amplifier If VREF e 10V every millivolt offset between IOUT 1 or IOUT 0 005% linearity error will be introduced Note 4 Human body model 100 pF discharged through 5 kX resistor Note 5 Absolute Maximum Ratings indicate limits beyond which damage to the device may occur DC and AC electrical specifications do not apply when operating the device beyond its specified operating conditions Note 6 The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX iJA and the ambient temepature TA The maximum allowable power dissipation at any temperature PD e (TJMAX b TA) iJA or the number given in the Absolute Maximum Ratings whichever is lower For this device TJMAX 125 C and the typical junction-to-ambient thermal resistance of the J18 package when board mounted C W For the N18 package iJA C W for the N16 this number C W and for the V20 this number C W

FIGURE 1 Digital Input Threshold vs Ambient Temperature



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