DAC7821 Datasheet, PDF (1/18 Pages) Texas Instruments – 12-Bit, Parallel Input, Multiplying Digital-to-Analog Converter

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DAC7821
DAC7821
SBAS365A – OCTOBER 2005 – REVISED FEBRUARY 2006
12-Bit, Parallel Input, Multiplying
Digital-to-Analog Converter
FEATURES
• 2.5 V to 5.5 V Supply Operation
• Fast Parallel Interface:
17ns Write Cycle
• Update Rate of 20.4 MSPS
• 10 MHz Multiplying Bandwidth
• ±10 V Reference Input
• Low Glitch Energy: 5 nV-s
• Extended Temperature Range:
–40°C to +125°C
• 20-Lead QFN and 20-Lead TSSOP Packages
• 12-Bit Monotonic
• ±1 LSB INL
• 4-Quadrant Multiplication
• Power-On Reset with Brownout Detection
• Readback Function
• Industry-Standard Pin Configuration
APPLICATIONS
• Portable Battery-Powered Instruments
• Waveform Generators
• Analog Processing
• Programmable Amplifiers and Attenuators
• Digitally-Controlled Calibration
• Programmable Filters and Oscillators
• Composite Video
• Ultrasound
DESCRIPTION
The DAC7821 is a CMOS 12-bit current output
digital-to-analog converter (DAC). This device
operates from a single 2.5 V to 5.5 V power supply,
making it suitable to battery-powered and many other
applications.
This DAC operates with a fast parallel interface. Data
readback allows the user to read the contents of the
DAC register via the DB pins. On power-up, the
internal register and latches are filled with zeroes and
the DAC outputs are at zero scale.
The DAC7821 offers excellent 4-quadrant
multiplication characteristics, with large signal
multiplying bandwidth of 10 MHz. The applied
external reference input voltage (V_REF) determines
the full-scale output current. An integrated feedback
resistor (R_FB) provides temperature tracking and
full-scale voltage output when combined with an
external current-to-voltage precision amplifier.
The DAC7821 is available in a 20-lead TSSOP
package as well as a small 20-lead QFN package
(available Q2 2006).
V_DD
V_REF
DAC7821
Power-On
Reset
12-Bit
R-2R DAC
R
R_FB
I_OUT1
I_OUT2
DAC Register
Input Latch
CS
Control
R/W
Logic
GND
Parallel Bus
DB0
DB11
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.
All trademarks are the property of their respective owners.
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 © 2005–2006, Texas Instruments Incorporated