DAC1218 DAC1219
12-Bit Binary Multiplying D A Converter
General 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 con-
verters are all guaranteed over temperature In addition
these parameters are specified with standard zero and full-
scale adjustment procedures as opposed to the impractical
best fit straight line guarantee
This level of precision is achieved though the use of an
advanced silicon-chromium (SiCr) R-2R resistor ladder net-
work This type of thin-film resistor eliminates the parasitic
diode problems associated with diffused resistors and al-
lows the applied reference voltage to range from
25V independent of the logic supply voltage
CMOS current switches and drive circuitry are used to
achieve low power consumption (20 mW typical) and mini-
mize 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
Typical Application
A1
A2
V
V
e b
a
OUT
REF
2
4
where AN
1 if digital input is high
e
AN
0 if digital input is low
e
Ordering Information
Temperature Range
Non
0 012%
Linearity
0 024%
BI-FET
TM
is a trademark of National Semiconductor Corp
C 1995 National Semiconductor Corporation
TL H 5691
a microprocessor bus is desirable the DAC1208 and
DAC1230 series eliminate the need for additional interface
logic
Features
Linearity specified with zero and full-scale adjust only
Y
Logic inputs which meet TTL voltage level specs (1 4V
Y
logic threshold)
Works with
10V reference full 4-quadrant
Y
g
multiplication
All parts guaranteed 12-bit monotonic
Y
25V to
b
Key Specifications
Current Settling Time
Y
Resolution
Y
Linearity (Guaranteed
Y
over temperature)
Gain Tempco
Y
Low Power Dissipation
Y
Single Power Supply
Y
Connection Diagram
TL H 5691 – 1
A3
A12
a
a
8
4096
0 C to
70 C
40 C to
85 C
a
b
a
DAC1218LCJ-1
DAC1218LCJ
DAC1219LCJ
December 1994
1 s
12 Bits
12 Bits (DAC1218)
11 Bits (DAC1219)
1 5 ppm C
20 mW
5 V
to 15 V
DC
DC
Dual-In-Line Package
TL H 5691– 15
Top View
Package Outline
J18A Cerdip
J18A Cerdip
RRD-B30M115 Printed in U S A