REV. B
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a
AD7541A
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 World Wide Web Site: http://www.analog.com
Fax: 617/326-8703 © Analog Devices, Inc., 1997
CMOS
12-Bit Monolithic Multiplying DAC
FUNCTIONAL BLOCK DIAGRAM
10kΩ 10kΩ 10kΩ
20kΩ 20kΩ 20kΩ 20kΩ 20kΩ
S1 S2 S3 S12
V
REF
OUT2
OUT1
R
FEEDBACK
BIT 12 (LSB)BIT 3BIT 2BIT 1 (MSB)
DIGITAL INPUTS (DTL/TTL/CMOS COMPATIBLE)
LOGIC: A SWITCH IS CLOSED TO I
OUT1
FOR
ITS DIGITAL INPUT IN A "HIGH" STATE.
10kΩ
FEATURES
Improved Version of AD7541
Full Four-Quadrant Multiplication
12-Bit Linearity (Endpoint)
All Parts Guaranteed Monotonic
TTL/CMOS Compatible
Low Cost
Protection Schottky Diodes Not Required
Low Logic Input Leakage
GENERAL DESCRIPTION
The Analog Devices AD7541A is a low cost, high performance
12-bit monolithic multiplying digital-to-analog converter. It is
fabricated using advanced, low noise, thin film on CMOS
technology and is available in a standard 18-lead DIP and in
20-terminal surface mount packages.
The AD7541A is functionally and pin compatible with the in-
dustry standard AD7541 device and offers improved specifica-
tions and performance. The improved design ensures that the
device is latch-up free so no output protection Schottky diodes
are required.
This new device uses laser wafer trimming to provide full 12-bit
endpoint linearity with several new high performance grades.
PRODUCT HIGHLIGHTS
Compatibility: The AD7541A can be used as a direct replace-
ment for any AD7541-type device. As with the Analog Devices
AD7541, the digital inputs are TTL/CMOS compatible and
have been designed to have a ±1 µA maximum input current
requirement so as not to load the driving circuitry.
Improvements: The AD7541A offers the following improved
specifications over the AD7541:
1. Gain Error for all grades has been reduced with premium
grade versions having a maximum gain error of ±3 LSB.
2. Gain Error temperature coefficient has been reduced to
2 ppm/°C typical and 5 ppm/°C maximum.
3. Digital-to-analog charge injection energy for this new device
is typically 20% less than the standard AD7541 part.
4. Latch-up proof.
5. Improvements in laser wafer trimming provides 1/2 LSB max
differential nonlinearity for top grade devices over the operat-
ing temperature range (vs. 1 LSB on older 7541 types).
6. All grades are guaranteed monotonic to 12 bits over the
operating temperature range.
ORDERING GUIDE
1
Relative Gain
Temperature Accuracy Error Package
Model
2
Range T
MIN
to T
MAX
T
A
= +258C Options
3
AD7541AJN 0°C to +70°C ±1 LSB ±6 LSB N-18
AD7541AKN 0°C to +70°C ±1/2 LSB ±1 LSB N-18
AD7541AJP 0°C to +70°C ±1 LSB ±6 P-20A
AD7541AKP 0°C to +70°C ±1/2 LSB ±1 P-20A
AD7541AKR 0°C to +70°C ±1/2 LSB ±1 R-18
AD7541AAQ –25°C to +85°C ±1 LSB ±6 LSB Q-18
AD7541ABQ –25°C to +85°C ±1/2 LSB ±1 LSB Q-18
AD7541ASQ –55°C to +125°C ±1 LSB ±6 LSB Q-18
AD7541ATQ –55°C to +125°C ±1/2 LSB ±1 LSB Q-18
AD7541ASE –55°C to +125°C ±1 LSB ±6 LSB E-20A
AD7541ATE –55°C to +125°C ±1/2 LSB ±1 LSB E-20A
NOTES
1
Analog Devices reserves the right to ship either ceramic (D-18) or cerdip (Q-18)
hermetic packages.
2
To order MIL-STD-883, Class B process parts, add /883B to part number. Contact
local sales office for military data sheet.
3
E = Leadless Ceramic Chip Carrier; N = Plastic DIP; P = Plastic Leaded Chip
Carrier; Q = Cerdip; R = Small Outline IC.
