19-1088; Rev 3; 12/99
+5V, Serial-Input, Voltage-Output, 14-Bit DACs
General Description
Features
The MAX544/MAX545 are serial-input, voltage-output,
14-bit digital-to-analog converters (DACs) that operate
from a single +5V supply. They provide 14-bit perfor-
mance (±±.5ꢀLS ꢁIꢀ and ±±.0ꢀLS DIꢀ) over tempera-
ture without any adjustments. The DAC output is
unbuffered, resulting in a low supply current of ±.3mA
and a low offset error of ±.6mV.
ꢀ Full 14-Bit Performance Without Adjustments
ꢀ +5V Single-Supply Operation
ꢀ Low Power: 1.5mW
ꢀ 1µs Settling Time
ꢀ Unbuffered Voltage Output Directly Drives 60kΩ
Loads
The DAC output range is ±V to V
For bipolar opera-
REF.
ꢀ SPI/QSPI/MICROWIRE-Compatible Serial Interface
tion, matched scaling resistors are provided in the
MAX545 for use with an external precision op amp
(such as the MAX4±±), generating a ±V
ꢀ Power-On Reset Circuit Clears DAC Output to 0V
output
REF
(unipolar mode)
swing. The MAX545 also includes Kelvin-sense con-
nections for the reference and analog ground pins to
reduce layout sensitivity.
ꢀ Schmitt-Trigger Inputs for Direct Optocoupler
Interface
ꢀ Pin-Compatible 16-Bit Upgrades
A 16-bit serial word is used to load data into the DAC
latch. The 1±MHz, 3-wire serial interface is compatible
with LPꢁ™/QLPꢁ™/MꢁCROWꢁRE™, and it also interfaces
directly with optocouplers for applications requiring isola-
tion. A power-on reset circuit clears the DAC output to ±V
(unipolar mode) when power is initially applied.
(MAX541/MAX542)
Ordering Information
INL
PART
TEMP. RANGE PIN-PACKAGE
The MAX544 is available in 8-pin plastic DꢁP and LO
packages. The MAX545 is available in 14-pin plastic
DꢁP and LO packages.
(LSB)
±1/ꢂ
±1
MAX544ACPA
MAX544SCPA
MAX544ACLA
MAX544SCLA
±°C to +7±°C
±°C to +7±°C
±°C to +7±°C
±°C to +7±°C
8 Plastic DꢁP
8 Plastic DꢁP
8 LO
±1/ꢂ
±1
Applications
Digital Offset and Gain Adjustment
ꢁnstrumentation
8 LO
Ordering Information continued at end of data sheet.
ꢁndustrial Process Control
Automated Test Equipment
Data-Acquisition Lystems
Functional Diagrams
V
DD
Pin Configurations
RFB
INV
TOP VIEW
MAX545
R
FB
R
INV
REFF
REFS
V
14
RFB
OUT
1
2
3
4
5
6
7
DD
14-BIT DAC
OUT
13 INV
AGNDF
AGNDS
MAX545
AGNDF
AGNDS
REFS
REFF
12 DGND
1
2
3
4
8
7
6
5
V
DD
OUT
AGND
REF
DATA LATCH
CS
LDAC
SCLK
DIN
11
10
9
LDAC
DIN
DGND
DIN
CONTROL
LOGIC
MAX544
SERIAL INPUT REGISTER
N.C.
CS
SCLK
CS
8
SCLK
DGND
DIP/SO
DIP/SO
Functional Diagrams continued at end of data sheet.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________ Maxim Integrated Products
1
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