DAC7553_14 Datasheet, PDF (1/26 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 – SEPTEMBER 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,
voltage-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
outputs 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 consumption 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..
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005, Texas Instruments Incorporated