MAX545B 데이터 시트보기 (PDF) - Maxim Integrated
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MAX545B Datasheet PDF : 12 Pages
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+5V, Serial-Input, Voltage-Output, 14-Bit DACs
+5V
+2.5V
10µF
MC68XXXX
0.1µF
VDD
0.1µF
REF (REFF) (REFS)
PCS0
CS
MOSI
DIN
MAX544/MAX545
OUT
SCLK
(GND)
SCLK
(LDAC)
DGND
AGND_
( ) ARE FOR MAX545 ONLY
Figure 2a. Typical Operating Circuit—Unipolar Output
+5V +2.5V
10µF
MC68XXXX
PCS0
MOSI
SCLK
IC1
(GND)
0.1µF
0.1µF
VDD
CS
DIN
SCLK
LDAC
DGND
REFF
REFS
RINV
MAX545
AGNDF
RFB
RFB
INV
OUT
AGNDS
MAX495
UNIPOLAR
OUT
EXTERNAL OP AMP
+5V
BIPOLAR
MAX400
OUT
EXTERNAL OP AMP
-5V
Figure 2b. Typical Operating Circuit—Bipolar Output
Detailed Description
The MAX544/MAX545 voltage-output, 14-bit digital-to-
analog converters (DACs) offer full 14-bit performance
with less than 0.5LSB integral linearity error and less
than 0.9LSB differential linearity error, thus ensuring
monotonic performance. Serial-data transfer minimizes
the number of package pins required.
The MAX544/MAX545 are composed of two matched
DAC sections, with an inverted R-2R DAC forming the
LSBs and the four MSBs derived from 15 identically
matched resistors. This architecture allows the lowest
glitch energy to be transferred to the DAC output on
major-carry transitions. It also lowers the DAC output
impedance by a factor of eight compared to a standard
R-2R ladder, allowing unbuffered operation in medium-
load applications.
The MAX545 provides matched bipolar offset resistors,
which connect to an external op amp for bipolar output
swings (Figure 2b). For optimum performance, the
MAX545 also provides a set of Kelvin connections to
the voltage-reference and analog-ground inputs.
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