a
CMOS
12-Bit Monolithic Multiplying DAC
AD7541A
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
FUNCTIONAL BLOCK DIAGRAM
10kΩ
10kΩ
10kΩ
VREF
20kΩ
S1
20kΩ
20kΩ
S2
S3
20kΩ
20kΩ
S12
OUT2
OUT1
10kΩ
RFEEDBACK
GENERAL DESCRIPTION
BIT 1 (MSB)
BIT 2
BIT 3
BIT 12 (LSB)
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.
PRODUCT HIGHLIGHTS
The AD7541A is functionally and pin compatible with the industry standard AD7541 device and offers improved specifications and performance. The improved design ensures that the
device is latch-up free so no output protection Schottky diodes
are required.
Compatibility: The AD7541A can be used as a direct replacement 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.
This new device uses laser wafer trimming to provide full 12-bit
endpoint linearity with several new high performance grades.
Improvements: The AD7541A offers the following improved
specifications over the AD7541:
DIGITAL INPUTS (DTL/TTL/CMOS COMPATIBLE)
LOGIC: A SWITCH IS CLOSED TO IOUT1 FOR
ITS DIGITAL INPUT IN A "HIGH" STATE.
1. Gain Error for all grades has been reduced with premium
grade versions having a maximum gain error of ± 3 LSB.
ORDERING GUIDE 1
Model2
Temperature
Range
Relative
Gain
Accuracy
Error
TMIN to T MAX TA = +25؇C
Package
Options3
AD7541AJN
AD7541AKN
AD7541AJP
AD7541AKP
AD7541AKR
AD7541AAQ
AD7541ABQ
AD7541ASQ
AD7541ATQ
AD7541ASE
AD7541ATE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
–25°C to +85°C
–25°C to +85°C
–55°C to +125°C
–55°C to +125°C
–55°C to +125°C
–55°C to +125°C
± 1 LSB
± 1/2 LSB
± 1 LSB
± 1/2 LSB
± 1/2 LSB
± 1 LSB
± 1/2 LSB
± 1 LSB
± 1/2 LSB
± 1 LSB
± 1/2 LSB
N-18
N-18
P-20A
P-20A
R-18
Q-18
Q-18
Q-18
Q-18
E-20A
E-20A
± 6 LSB
± 1 LSB
±6
±1
±1
± 6 LSB
± 1 LSB
± 6 LSB
± 1 LSB
± 6 LSB
± 1 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 operating temperature range (vs. 1 LSB on older 7541 types).
6. All grades are guaranteed monotonic to 12 bits over the
operating temperature range.
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.
REV. B
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
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
