DAC7558_16 Datasheet, PDF (1/31 Pages) Texas Instruments – 12-BIT, OCTAL, ULTRALOW GLITCH, VOLTAGE OUTPUT DIGITAL-TO-ANALOG CONVERTER

DAC7558
www.ti.com
SLAS435A – MAY 2005 – REVISED DECEMBER 2005
12-BIT, OCTAL, 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: 1.8 mA (Max)
• Per-Channel Power Down: 2 µA (Max)
• Power-On Reset to Zero Scale and Mid Scale
• SPI-Compatible Serial Interface: Up to 50 MHz
• Simultaneous or Sequential Update
• Asynchronous Clear
• Binary and Twos-Complement Capability
• Daisy-Chain Operation
• 1.8-V to 5.5-V Logic Compatibility
• Specified Temperature Range: –40°C to 105°C
• Small, 5-mm x 5-mm, 32-Lead QFN Package
APPLICATIONS
• Portable Battery-Powered Instruments
• Digital Gain and Offset Adjustment
• Programmable Voltage and Current Sources
• Programmable Attenuators
• Industrial Process Control
DESCRIPTION
The DAC7558 is a 12-bit, octal-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
DAC7558 operates from a single 2.7-V to 5.5-V
supply. The DAC7558 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 to zero volts 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.
The small size and low-power operation makes the
DAC7558 ideally suited for battery-operated portable
applications. The power consumption is typically 7.5
mW at 5 V, 3.7 mW at 3 V, and reduces to 1 µW in
power-down mode.
The DAC7558 is available in a 32-lead QFN package
and is specified over –40°C to 105°C.
FUNCTIONAL BLOCK DIAGRAM
V_DD
IOV_DD
VREF1
VREF2
−
Input
Register
DAC
Register
String
DAC A
+
SCLK
SYNC
SDIN
SDO
Interface
Logic
Input
Register
Power-On
Reset
DAC
Register
String
DAC H
−
+
Power-Down
Logic
DCEN RST RSTSEL AGND DGND VREF3 VREF4
PD
VFBA
V_OUTA
VFBH
V_OUTH
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