MAX548A Datasheet, PDF (1/16 Pages) Maxim Integrated Products – +2.5V to +5.5V, Low-Power, Single/Dual, 8-Bit Voltage-Output DACs in μMAX Package

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.
________________________Applications
Battery-Powered Systems
VCXO Control
Comparator-Level Settings
GaAs Amp Bias Control
Digital Gain and Offset Control
____________________________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)
______________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
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 _________________Pin Configurations
FEATURE
Number of DACs
DAC Reference
Asynchronous
Load DAC Input
µMAX Package
MAX548A MAX549A MAX550A
2
2
1
V_DD
External External
√
—
√
√
√
√
TOP VIEW
GND 1
OUTA 2
CS 3
DIN 4
MAX548A
8 V_DD
7 OUTB
6 LDAC
5 SCLK
SPI and QSPI are trademarks of Motorola Inc.
Microwire is a trademark of National Semiconductor Corp.
DIP/µMAX
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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