CMOS,
12-Bit, Monolithic Multiplying DAC
Data Sheet
Rev. C Document Feedback
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FEATURES
Improved version of the obsoleted product, AD7541
Full 4 quadrant multiplication
12-bit linearity (endpoint)
All parts guaranteed monotonic
TTL/CMOS compatible
Protection Schottky diodes not required
Low logic input leakage
APPLICATIONS
Waveform generators
Analog processing
Instrumentation applications
Programmable amplifiers and attenuators
Digitally controlled calibration
Programmable filters and oscillators
Composite video
Ultrasound
Gain, offset, and voltage trimming
FUNCTIONAL BLOCK DIAGRAM
DIGITAL INPUTS (DTL/TTL/CMOS COMPATIBLE)
LOGIC: A SWITCH IS CLOSED TO I
OUT 1
FOR
ITS DIGITAL INPUT IN A HIGH STATE.
20kΩ
S1
10kΩ
20kΩ
S2
10kΩ
20kΩ
S3
10kΩ
20kΩ
S12
20kΩ
V
REF
OUT 2
BIT 1 (MSB)
OUT 1
BIT 2
BIT 3 BIT 12 (LSB)
R
FEEDBACK
10kΩ
00718-001
Figure 1.
GENERAL DESCRIPTION
The AD7541A is a high performance, 12-bit monolithic
multiplying digital-to-analog converter (DAC). It is fabricated
using advanced, low noise, thin film, complementary metal-
oxide semiconductor (CMOS) technology. The AD7541A is
available in 18-lead PDIP, 18-lead PLCC, and 18-lead SOIC
packages.
The AD7541A is functionally and pin compatible with the
industry standard AD7541, and it offers improved specifications
and performance over the obsolete product, AD7541. The
improved design ensures that the AD7541A is latch-up free;
therefore, no output protection Schottky diodes are required.
The AD7541A uses laser wafer trimming to provide full 12-bit
endpoint linearity with several high performance grades.
PRODUCT HIGHLIGHTS
Compatibility—The AD7541A can be used as a direct replacement
for any AD7541 type device. As with the AD7541, The digital
inputs on the AD7541A are TTL/CMOS compatible. They have
a ±1 µA maximum input current requirement so that they do
not load the driving circuitry.
Improvements—The AD7541A offers the following improved
specifications over the AD7541:
1. Gain error for all grades are reduced with premium grade
versions having a maximum gain error of ±3 LSB.
2. Gain error temperature coefficient are reduced to
2 ppm/°C typical and 5 ppm/°C maximum.
3. Digital-to-analog charge injection energy for the AD7541A
is typically 20% less than the standard AD7541.
4. Latch-up proof.
5. Laser wafer trimming provides 1/2 LSB maximum
differential nonlinearity for top grade devices over the
operating temperature range (vs. 1 LSB on previous AD7541
devices).
6. All grades are guaranteed monotonic to 12 bits over the
operating temperature range.
