MAX544 Maxim, MAX544 Datasheet - Page 7

• Manufacturer Part Number: MAX544
• Description: +5V / Serial-Input / Voltage-Output / 14-Bit DACs
• Manufacturer: Maxim

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
Figure 2a. Typical Operating Circuit—Unipolar Output
Figure 2b. Typical Operating Circuit—Bipolar Output
( ) ARE FOR MAX545 ONLY
+5V, Serial-Input, Voltage-Output, 14-Bit DACs
MC68XXXX
MC68XXXX
(GND)
(GND)
_______________________________________________________________________________________
PCS0
MOSI
SCLK
PCS0
MOSI
SCLK
IC1
Detailed Description
0.1µF
CS
DIN
SCLK
(
CS
DIN
SCLK
LDAC
LDAC
DGND
+5V
V
)
DD
0.1µF
+2.5V
DGND
+5V
V
REFF
DD
0.1µF
10µF
MAX544/MAX545
AGNDF
REF (REFF)
REFS
+2.5V
MAX545
0.1µF
AGND_
10µF
R
INV
(REFS)
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.
AGNDS
R
FB
RFB
INV
OUT
OUT
MAX495
MAX400
EXTERNAL OP AMP
+5V
-5V
EXTERNAL OP AMP
UNIPOLAR
OUT
BIPOLAR
OUT
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