Rainbow-electronics MAX5550 User Manual

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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 1µA (max) in shutdown
mode. The MAX5550 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 I
2
C*-/SPI™-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°C to +85°C) temperature range.
Applications
PIN Diode Biasing
RF Attenuator Control
VCO Tuning
Features
Pin-Selectable I
2
C- 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
MAX5550
Dual, 10-Bit, Programmable, 30mA
High-Output-Current DAC
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3871; Rev 0; 10/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART
TEMP
RANGE
PIN-
PACKAGE
PKG
CODE
TOP
MARK
MAX5550ETE
-40°C to
+85°C
16 Thin QFN T1633F-3 ACZ
*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.
+1.25V
REF
REFIN
BUFFER
10-BIT CURRENT-STEERING
DAC A
P
OUTA
V
DD
FSADJA
V
DD
OUTB
FSADJB
GND
DOUT/A1
CS/A0
DIN/SDASCLK/SCL
SPI/I2C
16-BIT INPUT REGISTER
DAC REGISTER A
DAC REGISTER B
10-BIT CURRENT-STEERING
DAC B
MAX5550
P
Functional Diagram
Pin Configuration appears at end of data sheet.
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Summary of Contents

Page 1 - High-Output-Current DAC

General DescriptionThe MAX5550 dual, 10-bit, digital-to-analog converter(DAC) features high-output-current capability. TheMAX5550 sources up to 30mA p

Page 2

MAX5550Early STOP ConditionsThe MAX5550 recognizes a STOP condition at any pointduring transmission except if a STOP condition occurs inthe same high

Page 3

Slave AddressA master initiates communication with a slave deviceby issuing a START condition followed by a slaveaddress (see Table 3). The slave addr

Page 4

MAX5550Applications InformationDaisy Chaining (SPI/I2C= VDD)In standard SPI-/QSPI™-/MICROWIRE™-compatiblesystems, a microcontroller (µC) communicates

Page 5

MAX5550Dual, 10-Bit, Programmable, 30mA High-Output-Current DAC______________________________________________________________________________________

Page 6

MAX5550Power SequencingEnsure that the voltage applied to REFIN does notexceed VDDat any time. If proper power sequencing isnot possible, connect an e

Page 7

MAX5550Dual, 10-Bit, Programmable, 30mA High-Output-Current DACMaxim cannot assume responsibility for use of any circuitry other than circuitry entire

Page 8

MAX5550Dual, 10-Bit, Programmable, 30mA High-Output-Current DAC2 _____________________________________________________________________________________

Page 9

MAX5550Dual, 10-Bit, Programmable, 30mA High-Output-Current DAC_______________________________________________________________________________________

Page 10

MAX5550Dual, 10-Bit, Programmable, 30mA High-Output-Current DAC4 _____________________________________________________________________________________

Page 11

MAX5550Dual, 10-Bit, Programmable, 30mA High-Output-Current DAC_______________________________________________________________________________________

Page 12

MAX5550Dual, 10-Bit, Programmable, 30mA High-Output-Current DAC6 _____________________________________________________________________________________

Page 13

MAX5550Dual, 10-Bit, Programmable, 30mA High-Output-Current DAC_______________________________________________________________________________________

Page 14

MAX5550Detailed DescriptionArchitectureThe MAX5550 10-bit, dual current-steering DAC (seethe Functional Diagram) operates with DAC updaterates up to 1

Page 15

I2C Compatibility (SPI/I2C= GND)The MAX5550 is compatible with existing I2C systems(Figure 2). SCL and SDA are high-impedance inputs;SDA has an open-d

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