MAX5548 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – Dual, 8-Bit, Programmable, 30mA High-Output-Current DAC

19-3836; Rev 0; 10/05
Dual, 8-Bit, Programmable, 30mA
High-Output-Current DAC
General Description
The MAX5548 dual, 8-bit, digital-to-analog converter
(DAC) features high-output-current capability. The
MAX5548 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 MAX5548 typically consumes 1.5mA per DAC in
normal operation and less than 1µA (max) in shutdown
mode. The MAX5548 also features low output leakage
current in shutdown mode (±1µA 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 I²C*-/SPI™-compatible
serial interface provides optimum flexibility for the
MAX5548. The maximum programmable output current
value is set using software and an adjustment resistor.
The MAX5548 is available in a 3mm x 3mm, 16-pin, thin
QFN package, and is specified over the extended
(-40°C to +85°C) temperature range.
Applications
PIN Diode Biasing
RF Attenuator Control
VCO Tuning
Features
♦ Pin-Selectable I²C- or SPI-Compatible Interface
♦ Guaranteed Low Output Leakage Current in
Shutdown (±1µA max)
♦ Guaranteed Monotonic over Extended
Temperature Range
♦ Dual Outputs for Balanced Systems
♦ Current Outputs Source Up to 30mA per DAC
♦ Parallelable Outputs for 60mA Applications
♦ Output Stable with RF Filters
♦ Internal or External Reference Capability
♦ Digital Output (DOUT) Available for Daisy
Chaining in SPI Mode
♦ +2.7V to +5.25V Single-Supply Operation
♦ 16-Pin (3mm x 3mm) Thin QFN Package
♦ Programmable Output Current Range Set by
Software and Adjustment Resistor
Ordering Information
PART
MAX5548ETE
TEMP
RANGE
-40°C to
+85°C
PIN-
PKG
16 Thin
QFN
PKG
CODE
TOP
MARK
T1633F-3 ACY
Functional Diagram
REFIN
VDD
+1.25V
REF
BUFFER
8-BIT CURRENT-STEERING
DAC A
P
OUTA
FSADJA
VDD
*Purchase of I²C components from Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys
a license under the Philips I²C Patent Rights to use these com-
ponents in an I²C system, provided that the system conforms
to the I²C Standard Specification as defined by Philips.
SPI is a trademark of Motorola, Inc.
Pin Configuration appears at end of data sheet.
DAC REGISTER A
DAC REGISTER B
8-BIT CURRENT-STEERING
DAC B
SPI/I2C
16-BIT INPUT REGISTER
SCLK/SCL DIN/SDA CS/A0 DOUT/A1
MAX5548
GND
P
OUTB
FSADJB
________________________________________________________________ Maxim Integrated Products 1
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