Datasheet

1
LTC7541A
Improved
Industry Standard CMOS
12-Bit Multiplying DAC
■
Improved Direct Replacement for AD7541A
and AD7541
■
4-Quadrant Multiplication
■
12-Bit End-Point Linearity: ± 0.5LSB DNL and INL
Over Temperature
■
All Grades Guaranteed Monotonic
■
Maximum Gain Error: ± 1LSB
■
Single 5V to 15V Supply
■
TTL and CMOS Logic Compatible
■
Reduced Sensitivity to Op Amp Offset
■
Low Power Consumption
■
Virtually Latch-Up Proof
■
Low Cost
The LTC
®
7541A is a 12-bit resolution multiplying digital-
to-analog converter (DAC).
Laser-trimmed thin-film resistors provide excellent abso-
lute accuracy. Precision matched resistors and CMOS
circuitry result in remarkable stability with temperature
and supply variations.
The LTC7541A is a superior pin compatible replacement
for the industry standard AD7541A/AD7541. Improve-
ments include better typical accuracy and stability and
reduced sensitivity to output amplifier offset. The LTC7541A
is also very resistant to latch-up.
In addition to 2-quadrant and 4-quadrant multiplying
configurations, the LTC7541A performs well in digitally
programmable gain and noninverting voltage output ap-
plications. Low cost, improved performance and versatil-
ity make the LTC7541A the best choice for many new
designs and for upgrading existing systems. Parts are
available in 18-pin PDIP and 18-pin SO Wide packages.
FEATURES
DESCRIPTION
U
■
Motion Control Systems
■
Microprocessor-Controlled Calibration
■
Automatic Test Equipment
■
Programmable Gain Amplifiers
■
Digitally Controlled Filters
APPLICATIONS
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
U
2-Quadrant Multiplying DAC Has Less Than
0.5LSB (Typ) Total Unadjusted Error
DIGITAL INPUT CODE
0
INTEGRAL NONLINEARITY (LSB)
4095
7541A TA02
1024
2048
3072
1.0
0.5
0
–0.5
–1.0
512 1536 2560
3584
T
A
= 85°C
T
A
= 25°C
T
A
= –40°C
Integral Nonlinearity Over Temperature
V
DD
V
REF
LTC7541A
R
FB
GND
3
4 TO 15
2
16
15V
V
IN
17
18
1
OUT 1
33pF
V
OUT
7541 TA01
OUT 2
–
+
0.1µF
LT
®
1097
DIGITAL INPUTS