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What is MAX550A?

This electronic component, produced by the manufacturer "Maxim Integrated", performs the same function as "8-Bit Voltage-Output DACs".


MAX550A Datasheet PDF - Maxim Integrated

Part Number MAX550A
Description 8-Bit Voltage-Output DACs
Manufacturers Maxim Integrated 
Logo Maxim Integrated Logo 


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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 VDD = 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 VDD 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, VREF = +2.5V)
75µA (MAX550A, VREF = +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 TA = +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
221
VDD External External
√√√
TOP VIEW
GND 1
OUTA 2
CS 3
DIN 4
MAX548A
8 VDD
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
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
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MAX550A equivalent
+2.5V to +5.5V, Low-Power, Single/Dual,
8-Bit Voltage-Output DACs in µMAX Package
_____________________________Typical Operating Characteristics (continued)
(VDD = VREF = 2.5V, RL = 1M, CL = 15pF, TA = +25°C, unless otherwise noted.)
OUTPUT GLITCH FILTERING
CODE = 00 hex
SETTLING TIME (RISING)
DAC CODE 00 hex to FF hex
5µs/div
OUT, 50mV/div, CL = 0pF
OUT, 50mV/div, CL = 100pF
OUT, 50mV/div, CL = 220pF
OUT, 50mV/div, CL = 1000pF
CS, 5V/div
2µs/div
OUT, 1V/div
CS, 5V/div
______________________________________________________________Pin Description
MAX548A
1
2
PIN
MAX549A
1
2
MAX550A
1
2
333
444
555
6—6
7 6—
—7
7
888
NAME
GND
OUTA
OUT
CS
DIN
SCLK
LDAC
OUTB
REF
VDD
FUNCTION
Ground
DAC A Output Voltage
DAC Output Voltage
Chip-Select Input. A logic low on CS enables serial data to be
clocked into the input shift register. Programming commands are
executed at CS’s rising edge.
Serial-Data Input. Data is clocked into the 16-bit input shift register on
SCLK’s rising edge.
Serial-Clock Input. Data is clocked in on SCLK’s rising edge.
Load DAC Input. After CS goes high and if programmed by the
control word, a falling edge on LDAC updates the DAC latch(es).
Connect LDAC to VDD if unused.
DAC B Output Voltage
External Reference Voltage Input for DAC(s)
Positive Power Supply (+2.5V to +5.5V)
_______________________________________________________________________________________ 5
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