DAC7822 Datasheet, PDF (1/18 Pages) Burr-Brown (TI) – Dual, 12-Bit, Parallel Input, Multiplying Digital-to-Analog Converter

BurrĆBrown Products
from Texas Instruments
DAC7822
DAC7822
Dual, 12-Bit, Parallel Input, Multiplying
Digital-to-Analog Converter
SBAS374 – JUNE 2006
FEATURES
• ±1LSB INL
• 2.5V to 5.5V Supply Operation
• Fast Parallel Interface:
17ns Write Cycle
• Update Rate of 20.4MSPS
• 10MHz Multiplying Bandwidth
• ±15V Reference Input
• Extended Temperature Range:
–40°C to +125°C
• 40-Lead QFN
• 12-Bit Monotonic
• 4-Quadrant Multiplication
• Power-On Reset with Brownout Detection
• Readback Function
• Industry-Standard Pin Configuration
• Pin-Compatible with the AD5405
APPLICATIONS
• Portable Battery-Powered Instruments
• Waveform Generators
• Analog Processing
• Programmable Amplifiers and Attenuators
• Digitally-Controlled Calibration
• Programmable Filters and Oscillators
• Ultrasound
DESCRIPTION
The DAC7822 is a dual, CMOS, 12-bit, current
output digital-to-analog converter (DAC). This device
operates from a 2.5V to 5.5V power supply, making it
suitable for battery-powered and many other
applications.
The DAC7822 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 DAC7822 offers excellent 4-quadrant
multiplication characteristics, with large signal
multiplying bandwidth of 10MHz. 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
DAC7822 also includes the resistors necessary for
4-quadrant multiplication and other configuration
modes.
The DAC7822 is available in a 40-lead QFN
package.
DATA
INPUTS
V_DD
DB0
DB11
R₃A R_{2_3}A R₂A V_REFA R₁A
R₃
R₂
2R
2R
R₁
R_FB
2R
2R
INPUT
BUFFER
LATCH
12-Bit
R-2R DAC A
R_FBA
I_OUT1A
I_OUT2A
DAC A/B
CS
R/W
LDAC
CLR
GND
CONTROL
LOGIC
LATCH
POWER-ON
RESET
R₃
R₂
2R
2R
12-Bit
R-2R DAC B
R₁
R_FB
2R
2R
I_OUT1B
I_OUT2B
R_FBB
R₃B R_{2_3}B R₂B V_REFB R₁B
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 © 2006, Texas Instruments Incorporated