DAC1220| Datasheet

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DAC1020 DAC1021 DAC1022 10-Bit Binary Multiplying D A Converter DAC1220 DAC1222 12-Bit Binary Multiplying D A Converter

May 1996

DAC1020 DAC1021 DAC1022 10-Bit Binary Multiplying D A Converter DAC1220 DAC1222 12-Bit Binary Multiplying D A Converter
General Description
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 (0 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 to V a and ground This part is available with 10-bit (0 05%) 9-bit (0 10%) and 8-bit (0 20%) no
n-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

Features
Y Y Y Y Y Y Y Y Y Y

Linearity specified with zero and full-scale adjust only Non-linearity guaranteed over temperature Integrated thin film on CMOS structure 10-bit or 12-bit resolution Low power dissipation 10 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

Equivalent Circuit

Note Switches shown in digital high state

TL H 5689 1

Ordering Information
Temperature Range NonLinearity 0 05% 0 10% 0 20% Package Outline Temperature Range NonLinearity 0 05% 0 20% DAC1220LCN DAC1222LCN DAC1020LCN DAC1021LCN DAC1022LCN

10-BIT D A CONVERTERS 0 C to 70 C AD7520LN AD7530LN AD7520KN AD7530KN AD7520JN AD7530JN N16A 12-BIT D A CONVERTERS 0 C to 70 C AD7521LN AD7531LN AD7521JN AD7531JN N18A
b 40 C to a 85 C b 40 C to 85 C

DAC1020LCV

DAC1020LIV

V20A

DAC1220LCJ DAC1222LCJ

AD7521LD AD7531LD AD7521JD AD7531JD J18A

Package Outline
Note Devices may be ordered by either part number

C1996 National Semiconductor Corporation

TL H 5689

RRD-B30M96 Printed in U S A

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DAC1220 DATASHEET