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MP1230A Datasheet, PDF (1/12 Pages) Exar Corporation – CMOS Microprocessor Compatible Double-Buffered 12-Bit Digital-to-Analog Converter | |||
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FEATURES
⢠Superior Ruggedized 1230 Series: 2 KV ESD
⢠Four Quadrant Multiplication
⢠Stable, More Accurate Segmented DAC Approach
â 0.2 ppm/°C Linearity Tempco
â 2 ppm/°C Max Gain Error Tempco
â Lowest Sensitivity to Amplifier Offset
â Lowest Output Capacitance (COUT = 80pF)
â Lower Glitch Energy
⢠Monotonic over Temperature Range
MP1230A/31A/32A
CMOS Microprocessor Compatible
Double-Buffered 12-Bit
Digital-to-Analog Converter
⢠Lower Data Bus Feedthrough @ CS = 1
⢠VDD from +11 V to +16 V
⢠Latch-Up Free CMOS Technology
⢠12-Bit Bus Version: MP1208/1209/1210
⢠16-Bit Upgrade: MP7636A
GENERAL DESCRIPTION
The MP1230A series are superior pin for pin replacements
for the 1230 series. The MP1230A series is manufactured using
advanced thin film resistors on a double metal CMOS process
which promotes significant improvements in reliability, latch-up
free performance and ESD protection.
The MP1230A series incorporates a unique decoding tech-
nique yielding lower glitch, higher speed and excellent accuracy
over temperature and time. 12-bit linearity is achieved without
trimming. Outstanding features include:
â Stability: integral and differential linearity tempcos are rated
at 0.2 ppm/°C typical. Monotonicity is guaranteed over all
temperature ranges. Scale factor tempco is a low 2 ppm/°C
maximum.
â Low Output Capacitance: Due to smaller MOSFET switch
geometries allowed by decoding, the output capacitance at
IOUT1 and IOUT2 is a low 80pF / 40pF and 25pF / 65 pF. This
less than half the competitive DAC 1230 series. Lower ca-
pacitance allows the MP1230A series to achieve settling
times faster than 1 µs for a 10 V step.
â Low Sensitivity to Output Amplifier Offset: The linearity er-
ror caused by amplifier offset is reduced by a factor of 2 in the
MP1230A series over conventional R-2R DACs.
The MP1230A series uses a circuit which reduces transients
in the supplies caused by DATA bus transitions at CS = 1.
SIMPLIFIED BLOCK DIAGRAM
VDD
VREF
DB11-DB4
DB3-DB0
8
BYTE1/BYTE2
INPUT LATCH DAC LATCH
D
Q
DQ
8
LE
8 12
LE
VREF
RFB
IOUT1
IOUT2
CS
WR1
D
Q
12
4
4
LE
XFER WR2 DGND
AGND
Rev. 2.00
1
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