LTC7543/LTC8143
Improved Industry Standard
Serial 12-Bit Multiplying DACs
FEATURES
s
s
s
s
s
DESCRIPTION
The LTC
廬
7543/LTC8143 are serial-input 12-bit multiply-
ing digital-to-analog converters (DACs). They are superior
pin compatible replacements for the AD7543 and
DAC-8143. Improvements include better accuracy, better
stability over temperature and supply variations, lower
sensitivity to output amplifier offset, tighter timing speci-
fications and lower output capacitance.
An easy-to-use serial interface includes an asynchronous
CLEAR input for systems requiring initialization to a known
state. The LTC8143 has a serial data output to allow daisy-
chaining multiple DACs on a 3-wire interface bus.
These DACs are extremely versatile. They can be used for
2-quadrant and 4-quadrant multiplying, programmable
gain and single supply applications, such as noninverting
voltage output and biased or offset ground mode.
Parts are available in 16-pin PDIP and SO packages and
are specified over the extended industrial temperature
range, 鈥?40擄C to 85擄C.
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
s
s
s
s
Improved Direct Replacement for AD7543
and DAC-8143
Low Cost
DNL and INL Over Temperature:
鹵0.5LSB
Easy, Fast and Flexible Serial Interface
Daisy-Chain 3-Wire Interface for Multiple DAC
Systems (LTC8143)
1LSB Maximum Gain Error Over Temperature
Eliminates Adjustment
Asynchronous Clear Input for Initialization
Four-Quadrant Multiplication
Low Power Consumption
16-Pin PDIP and SO Packages
APPLICATIONS
s
s
s
s
s
Process Control and Industrial Automation
Remote Microprocessor-Controlled Systems
Digitally Controlled Filters and Power Supplies
Programmable Gain Amplifiers
Automatic Test Equipment
TYPICAL APPLICATION
Multiplying DAC Has Easy 3-Wire Serial Interface
V
IN
5V
14
CLOCK
DATA
LOAD
4
7
5
15
16
33pF
INTEGRAL NONLINEARITY (LSB)
Integral Nonlinearity Over Temperature
1.0
+
鈥?/div>
R
FB
1
OUT 1
STB1
LTC7543
SRI
LTC8143
LD1
OUT 2
2
DGND
AGND
12
3
V
DD
V
REF
0.5
T
A
= 85擄C
0
T
A
= 鈥?0擄C
鈥?.5
T
A
= 25擄C
LT 1097
廬
V
OUT
7543/8143 TA01
鈥?.0
0
512 1024 1536 2048 2560 3072 3584 4095
DIGITAL INPUT CODE
7543/8143 TA02
U
U
U
1
1
2
3
4
5
6
7
8
