DAC7553 Datasheet, PDF (1/20 Pages) Texas Instruments – 12-BIT, DUAL, ULTRALOW GLITCH, VOLTAGE OUTPUT DIGITAL-TO-ANALOG CONVERTER

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Actual Size
3 mm x 3 mm
DAC7553
SLAS477 – AUGUST 2005
12-BIT, DUAL, ULTRALOW GLITCH, VOLTAGE OUTPUT
DIGITAL-TO-ANALOG CONVERTER
FEATURES
• 2.7-V to 5.5-V Single Supply
• 12-Bit Linearity and Monotonicity
• Rail-to-Rail Voltage Output
• Settling Time: 5 µs (Max)
• Ultralow Glitch Energy: 0.1 nVs
• Ultralow Crosstalk: –100 dB
• Low Power: 440 µA (Max)
• Per-Channel Power Down: 2 µA (Max)
• Power-On Reset to Midscale
• 2s Complement Input Data Format
• SPI-Compatible Serial Interface: Up to 50 MHz
• Daisy-Chain Capability
• Asynchronous Hardware Clear
• Simultaneous or Sequential Update
• Specified Temperature Range: –40°C to 105°C
• Small 3-mm × 3-mm, 16-Lead QFN Package
DESCRIPTION
The DAC7553 is a 12-bit, dual-channel, volt-
age-output DAC with exceptional linearity and
monotonicity. Its proprietary architecture minimizes
undesired transients such as code-to-code glitch and
channel-to-channel crosstalk. The low-power
DAC7553 operates from a single 2.7-V to 5.5-V
supply. The DAC7553 output amplifiers can drive a
2-kΩ, 200-pF load rail-to-rail with 5-µs settling time;
the output range is set using an external voltage
reference.
The 3-wire serial interface operates at clock rates up
to 50 MHz and is compatible with SPI, QSPI,
Microwire™, and DSP interface standards. The out-
puts of all DACs may be updated simultaneously or
sequentially. The parts incorporate a power-on-reset
circuit to ensure that the DAC outputs power up at
midscale and remain there until a valid write cycle to
the device takes place. The parts contain a
power-down feature that reduces the current con-
sumption of the device to under 2 µA.
APPLICATIONS
• Portable Battery-Powered Instruments
• Digital Gain and Offset Adjustment
• Programmable Voltage and Current Sources
• Programmable Attenuators
• Industrial Process Control
The small size and low-power operation makes the
DAC7553 ideally suited for battery-operated portable
applications. The power consumption is typically
1.5 mW at 5 V, 0.75 mW at 3 V, and reduces to 1 µW
in power-down mode.
The DAC7553 is available in a 16-lead QFN package
and is specified over –40°C to 105°C.
FUNCTIONAL BLOCK DIAGRAM
V_DD
IOV_DD
V_REFA
SCLK
SYNC
SDIN
SDO
Interface
Logic
Input
Register
DAC
Register
Input
Register
DAC
Register
DAC7553
Power-On
Reset
DCEN CLR
GND
_
String
+
DAC A
_
String
+
DAC B
Power-Down
Logic
V_REFB
PD
V_FBA
V_OUT A
V_FBB
V_OUT B
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Microwire is a trademark of National Semiconductor Corp..
PRODUCT PREVIEW information concerns products in the forma-
tive or design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the
right to change or discontinue these products without notice.
Copyright © 2005, Texas Instruments Incorporated