MP7616 Просмотр технического описания (PDF) - Exar Corporation

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MP7616

15 V CMOS 16-Bit Multiplying Digital-to-Analog Converter

Exar Corporation 

FEATURES

• Monolithic CMOS Construction

• Full Four-Quadrant Multiplication

• Excellent Stability Over Temperature and Time

• TTL/5 V CMOS Compatible

• Guaranteed Monotonic

MP7616

15 V CMOS

16-Bit Multiplying

Digital-to-Analog Converter

• 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

VDD

VREF

R R R R R R R R R R R R R R R 12-Bit

DAC

To Switches

4 to 15 Decoder

To 12-Bit DAC

IOUT2

IOUT1

RFB

1

4

5

MSB

16

GND

LSB

Rev. 2.00

1

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