19-1206; Rev 0; 3/97
+2 .5 V t o +5 .5 V, Lo w -P o w e r, S in g le /Du a l,
8 -Bit Vo lt a g e -Ou t p u t DACs in µMAX P a c k a g e
849/MX50A
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ +2.5V to +5.5V Single-Supply Operation
♦ ±1LSB (max) TUE
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
♦ Power-On Reset Clears All Registers to Zero
♦ Low Operating Current:
75µA per DAC with V
= 2.5V. In shutdown, the DAC
DD
is disconnected from the reference, reducing current
drain to less than 1µA. The MAX548A/MAX549A allow
each DAC to be shut down independently.
150µA (MAX548A/MAX549A, V
= +2.5V)
REF
75µA (MAX550A, V
= +2.5V)
REF
♦ 1µA Shutdown Mode
The 10MHz, 3-wire serial interface is compatible with
SPI™/QSPI™ a nd Mic rowire ™ inte rfa c e s ta nd a rd s .
Double-buffered inputs provide flexibility when updat-
ing the DACs; the input and DAC registers can be
updated individually or simultaneously.
♦ 10MHz, 3-Wire Serial Interface Compatible with
SPI/QSPI and Microwire
♦ µMAX Package—50% Smaller than 8-Pin SO
♦ Independent Shutdown of DACs
The MAX548A is a dual DAC with an asynchronous
(MAX548A/MAX549A)
load input; it uses V
as the reference input. The
DD
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.
______________Ord e rin g In fo rm a t io n
†
PART
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
MAX548ACPA
MAX548ACUA
MAX548AC/D
MAX548AEPA
MAX548AEUA
________________________Ap p lic a t io n s
Battery-Powered Systems
Dice*
8 Plastic DIP
8 µMAX
VCXO Control
Comparator-Level Settings
Ordering Information continued at end of data sheet.
*Dice are specified at T = +25°C, DC parameters only.
GaAs Amp Bias Control
A
†
Contact factory for availability of 8-pin SO package.
Digital Gain and Offset Control
_________________P in Co n fig u ra t io n s
_____________________S e le c t o r Gu id e
FEATURE
MAX548A
MAX549A
MAX550A
TOP VIEW
Number of DACs
DAC Reference
2
2
1
GND
OUTA
CS
1
2
3
4
8
7
6
5
V
DD
V
DD
External
External
OUTB
LDAC
SCLK
Asynchronous
Load DAC Input
√
√
—
√
√
MAX548A
µMAX Package
√
DIN
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