19-1206; Rev 0; 3/97
+2.5V to +5.5V, Low-Power, Single/Dual,
8-Bit Voltage-Output DACs in µMAX Package
_______________General Description
The MAX548A/MAX549A/MAX550A serial, 8-bit voltage-
output digital-to-analog converters (DACs) operate from
a single +2.5V to +5.5V supply. Their ±1LSB TUE spec-
ification is guaranteed over temperature. Operating cur-
rent (supply current plus reference current) is typically
75µA per DAC with V
DD
= 2.5V. In shutdown, the DAC
is disconnected from the reference, reducing current
drain to less than 1µA. The MAX548A/MAX549A allow
each DAC to be shut down independently.
The 10MHz, 3-wire serial interface is compatible with
SPI™/QSPI™ and Microwire™ interface standards.
Double-buffered inputs provide flexibility when updat-
ing the DACs; the input and DAC registers can be
updated individually or simultaneously.
The MAX548A is a dual DAC with an asynchronous
load input; it uses V
DD
as the reference input. The
MAX549A is a dual DAC with an external reference
input. The MAX550A is a single DAC with an external
reference input and an asynchronous load input.
The MAX548A/MAX549A/MAX550A’s low power con-
sumption and small µMAX and DIP packages make
these devices ideal for portable and battery-powered
applications.
____________________________Features
o
+2.5V to +5.5V Single-Supply Operation
o
±1LSB (max) TUE
o
Power-On Reset Clears All Registers to Zero
o
Low Operating Current:
150µA (MAX548A/MAX549A, V
REF
= +2.5V)
75µA (MAX550A, V
REF
= +2.5V)
o
1µA Shutdown Mode
o
10MHz, 3-Wire Serial Interface Compatible with
SPI/QSPI and Microwire
o
µMAX Package—50% Smaller than 8-Pin SO
o
Independent Shutdown of DACs
(MAX548A/MAX549A)
MAX548A/MAX549A/MAX550A
______________Ordering Information
PART
MAX548ACPA
MAX548ACUA
MAX548AC/D
MAX548AEPA
MAX548AEUA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
†
8 Plastic DIP
8 µMAX
Dice*
8 Plastic DIP
8 µMAX
________________________Applications
Battery-Powered Systems
VCXO Control
Comparator-Level Settings
GaAs Amp Bias Control
Digital Gain and Offset Control
Ordering Information continued at end of data sheet.
*Dice
are specified at T
A
= +25°C, DC parameters only.
†
Contact factory for availability of 8-pin SO package.
_____________________Selector Guide
FEATURE
Number of DACs
DAC Reference
Asynchronous
Load DAC Input
µMAX Package
MAX548A
2
V
DD
√
√
MAX549A
2
External
—
√
MAX550A
1
External
√
√
_________________Pin Configurations
TOP VIEW
GND
1
OUTA
2
8
7
V
DD
OUTB
LDAC
SCLK
MAX548A
CS
3
DIN
4
6
5
DIP/µMAX
SPI and QSPI are trademarks of Motorola Inc.
Microwire is a trademark of National Semiconductor Corp.
Pin Configurations continued at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
