19-3871; Rev 0; 10/05
Dual, 10-Bit, Programmable, 30mA
High-Output-Current DAC
General Description
The MAX5550 dual, 10-bit, digital-to-analog converter
(DAC) features high-output-current capability. The
MAX5550 sources up to 30mA per DAC, making it ideal
for PIN diode biasing applications. Outputs can also be
paralleled for high-current applications (up to 60mA
typ). Operating from a single +2.7V to +5.25V supply,
the MAX5550 typically consumes 1.5mA per DAC in
normal operation and less than 1碌A(chǔ) (max) in shutdown
mode. The MAX5550 also features low output leakage
current in shutdown mode (鹵1碌A(chǔ) max) that is essential
to ensure that the external PIN diodes are off.
Additional features include an integrated +1.25V
bandgap reference, and a control amplifier to ensure
high accuracy and low-noise performance. A separate
reference input (REFIN) allows for the use of an external
reference source, such as the MAX6126, for improved
gain accuracy. A pin-selectable I
2
C*-/SPI鈩?compatible
serial interface provides optimum flexibility for the
MAX5550. The maximum programmable output current
value is set using software and an adjustment resistor.
The MAX5550 is available in a (3mm x 3mm) 16-pin thin
QFN package, and is specified over the extended
(-40擄C to +85擄C) temperature range.
Features
鈾?/div>
Pin-Selectable I
2
C- or SPI-Compatible Interface
鈾?/div>
Guaranteed Low Output Leakage Current in
Shutdown (鹵1碌A(chǔ) max)
鈾?/div>
Guaranteed Monotonic over Extended
Temperature Range
鈾?/div>
Dual Outputs for Balanced Systems
鈾?/div>
Current Outputs Source Up to 30mA per DAC
鈾?/div>
Parallelable Outputs for 60mA Applications
鈾?/div>
Output Stable with RF Filters
鈾?/div>
Internal or External Reference Capability
鈾?/div>
Digital Output (DOUT) Available for Daisy
Chaining in SPI Mode
鈾?/div>
+2.7V to +5.25V Single-Supply Operation
鈾?/div>
16-Pin (3mm x 3mm) Thin QFN Package
鈾?/div>
Programmable Output Current Range Set by
Software and Adjustment Resistor
MAX5550
Ordering Information
PART
MAX5550ETE
TEMP
RANGE
-40擄C to
+85擄C
PIN-
PACKAGE
PKG
CODE
TOP
MARK
ACZ
Applications
PIN Diode Biasing
RF Attenuator Control
VCO Tuning
16 Thin QFN T1633F-3
Functional Diagram
REFIN
V
DD
+1.25V
REF
BUFFER
P
10-BIT CURRENT-STEERING
DAC A
OUTA
FSADJA
V
DD
MAX5550
*Purchase
of I
2
C components from Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys
a license under the Philips I
2
C Patent Rights to use these com-
ponents in an I
2
C system, provided that the system conforms
to the I
2
C Standard Specification as defined by Philips.
SPI is a trademark of Motorola, Inc.
SPI/I2C
DAC REGISTER A
DAC REGISTER B
P
10-BIT CURRENT-STEERING
DAC B
OUTB
FSADJB
16-BIT INPUT REGISTER
Pin Configuration appears at end of data sheet.
SCLK/SCL DIN/SDA
CS/A0
DOUT/A1
GND
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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