MP7616
15 V CMOS
16-Bit Multiplying
Digital-to-Analog Converter
FEATURES
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Monolithic CMOS Construction
Full Four-Quadrant Multiplication
Excellent Stability Over Temperature and Time
TTL/5 V CMOS Compatible
Guaranteed Monotonic
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Low Sensitivity to Output Amplifier Vos
Low Glitch Energy
Buffered Version: MP7626
5 V Version: MP7616B
GENERAL DESCRIPTION
The MP7616 is a high density 16-bit CMOS multiplying Digi-
tal-to-Analog Converter. Silicon nitride passivation and un-
trimmed silicon chromium resistors have been combined to pro-
vide long term stability and reliability. Using the most significant
bit (MSB) segmentation technique, the MP7616 features 13-bit
(0.012%) differential and 12-bit (0.01%) integral linearity.
To achieve 13-bit linearity without laser trim, the MP7616 digi-
tally decodes the four MSB’s into 15 equal current sources,
rather than the standard binary-weighted sources. Each resis-
tor contributes only 1/16 full scale output thus reducing the
matching accuracy requirement of the resistor and CMOS
switches from 0.0015% to 0.024%.
The decoding technique achieves an eightfold improvement
in differential linearity stability over temperature, an eightfold im-
provement in relative accuracy due to aging effects (long term
stability), a fourfold improvement in glitch amplitude, and a ten-
fold reduction in sensitivity to output amplifier offset voltage.
SIMPLIFIED BLOCK DIAGRAM
V
DD
V
REF
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
12-Bit
DAC
I
OUT2
I
OUT1
To Switches
To 12-Bit DAC
R
FB
4 to 15 Decoder
1
MSB
4
5
16
LSB
GND
Rev. 2.00
1
EXAR [ EXAR CORPORATION ]
