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MP7542TD Datasheet

  • MP7542TD

  • 5 V CMOS 4-Bit Input, 12-Bit Digital-to-Analog Converter

  • 111.91KB

  • 12頁(yè)

  • EXAR   EXAR

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MP7542
5 V CMOS
4-Bit Input, 12-Bit
Digital-to-Analog Converter
FEATURES
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12-Bit DAC with a 4-Bit Parallel Address for 4 & 8-Bit
Microprocessor or Microcontroller Interface
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Nonlinearity +1/2 LSB Tmin to Tmax
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Latch-Up Free
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Low Sensitivity to Output Amplifier V
OS
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Low Output Capacitance
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+5 V Supply Operation
Low Power Consumption: 40mW Max.
Low Cost
Serial Version: MP7543
GENERAL DESCRIPTION
The MP7542 is a precision, 12-bit CMOS 4-quadrant multi-
plying Digital-to-Analog Converter designed for direct interface
to 4 and 8-bit microprocessors.
The MP7542 consists of three 4-bit registers, a 12-bit DAC
register, address decoding logic, and a 12-bit CMOS multiplying
DAC. Data is loaded into the data registers in three 4-bit nibbles
and subsequently transferred to the 12-bit DAC register. All data
loading or data transfer operations are identical to the WRITE
cycle of a static RAM. A CLEAR input allows the 12-bit DAC reg-
ister to be reset to all zeros.
The MP7542 is manufactured using advanced thin-film on
monolithic double metal CMOS fabrication process. A unique
decoding technique is utilized yielding excellent accuracy and
stability.
The MP7542 reduces the additional linearity errors due to
output amplifier offset to only 330
碌
V per millivolt of offset versus
670
碌
V for the standard R-2R ladder CMOS DACs.
SIMPLIFIED BLOCK DIAGRAM
V
REF
R
FB
12-Bit Multiplying DAC
I
OUT1
I
OUT2
AGND
CLR
WR
CS
A0
A1
DB0 (LSB)
DB1
DB2
DB3 (MSB)
Address
Decode
Logic
H-Byte
Data
Register
M-Byte
Data
Register
L-Byte
Data
Register
12-Bit DAC Register
V
DD
DGND
Rev. 2.00
1

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