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 de-
posited thin film R-2R resistor ladder divides the reference
current and provides the circuit with excellent temperature
(note 1 of electrical characteristics). The DAC1020,
DAC1021 and DAC1022 are direct replacements for the 10-
bit resolution AD7520 and AD7530 and equivalent to the
AD7533 family. The DAC1220 and DAC1222 are direct re-
placements for the 12-bit resolution AD7521 and AD7531
family.
tracking characteristics (0.0002%/ C linearity error temper-
§
ature coefficient maximum). The circuit uses CMOS current
switches and drive circuitry to achieve low power consump-
tion (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 con-
trolled gain blocks) since its linearity error is essentially in-
dependent of the voltage reference. All inputs are protected
from damage due to static discharge by diode clamps to Va
and ground.
Features
Y
Linearity specified with zero and full-scale adjust only
Y
Non-linearity guaranteed over temperature
Y
Integrated thin film on CMOS structure
Y
10-bit or 12-bit resolution
@
Low power dissipation 10 mW 15V typ
Y
Y
Y
Y
Y
Y
s
s
25V
b
Accepts variable or fixed reference 25V
V
REF
4-quadrant multiplying capability
Interfaces directly with DTL, TTL and CMOS
This part is available with 10-bit (0.05%), 9-bit (0.10%), and
8-bit (0.20%) non-linearity guaranteed over temperature
Fast settling timeÐ500 ns typ
@
Low feedthrough errorÐ(/2 LSB 100 kHz typ
Equivalent Circuit
Note. Switches shown in digital high state
TL/H/5689–1
10-BIT D/A CONVERTERS
0 C to 70 C
Ordering Information
Temperature Range
b
40 C to 85 C
§
§
§
DAC1020LIV
§
0.05%
0.10%
0.20%
DAC1020LCN
AD7520LN,AD7530LN
AD7520KN,AD7530KN
AD7520JN,AD7530JN
DAC1020LCV
Non-
Linearity
DAC1021LCN
DAC1022LCN
Package Outline
N16A
12-BIT D/A CONVERTERS
V20A
b
a
40 C to 85 C
Temperature Range
0 C to 70 C
§
§
AD7521LN,AD7531LN
§
§
0.05%
0.20%
DAC1220LCN
DAC1222LCN
DAC1220LCJ
AD7521LD,AD7531LD
AD7521JD,AD7531JD
J18A
Non-
Linearity
AD7521JN,AD7531JN
DAC1222LCJ
Package Outline
N18A
Note. Devices may be ordered by either part number.
C
1996 National Semiconductor Corporation
TL/H/5689
RRD-B30M96/Printed in U. S. A.
http://www.national.com