MP7614 查看數據表（PDF） - Exar Corporation

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MP7614

15 V CMOS Multiplying 14-Bit Digital-to-Analog Converter

Exar Corporation 

FEATURES

• Full Four-Quadrant Multiplication

• Excellent Stability Over Temperature and Time

• Guaranteed Monotonic

• TTL/5 V CMOS Compatible

MP7614

15 V CMOS

Multiplying 14-Bit

Digital-to-Analog Converter

• Low Sensitivity to Output Amplifier VOS

• Low Glitch Energy

• 16-Bit Version: MP7616

GENERAL DESCRIPTION

The MP7614 is a high density 14-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 MP7614 features 13-bit

(0.012%) differential and 12-bit (0.01%) integral linearity.

To achieve 13-bit linearity without laser trim, the MP7614 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 0.006%.

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

RRRRRRRRRRRRRRR

10-Bit

DAC

To Switches

IOUT2

IOUT1

RFB

4 to 15 Decoder

To 10-Bit DAC

1

4

5

(MSB)

14

(LSB)

GND

Rev. 2.00

1

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