鈥?/div>
2.7 V to 5.5 V Supply Operation
50 MHz Serial Interface
10 MHz Multiplying Bandwidth
鹵10
V Reference Input
Low Glitch Energy: 2 nV-s
Extended Temperature Range:
鈥?0擄C to +125擄C
10-Lead SON Package
12-Bit Monotonic
4-Quadrant Multiplication
Power-On Reset with Brownout Detection
Daisy-Chain Mode
Readback Function
Industry-Standard Pin Configuration
DESCRIPTION
The DAC7811 is a CMOS 12-bit current output
digital-to-analog converter (DAC). This device
operates from a 3.0 V to 5.5 V power supply, making
it suitable to both battery-powered and many other
applications.
This DAC uses a double-buffered 3-wire serial
interface that is compatible with SPI鈩? QSPI,
MICROWIRE鈩? and most DSP interface standards.
In addition, a serial data out pin (SDO) allows for
daisy-chaining when multiple packages are used.
Data readback allows the user to read the contents of
the DAC register via the SDO pin. On power-up, the
internal shift register and latches are filled with zeroes
and the DAC outputs are at zero scale.
The DAC7811 offers excellent 4-quadrant multipli-
cation 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
) pro-
vides temperature tracking and full-scale voltage
output when combined with an external cur-
rent-to-voltage precision amplifier.
The DAC7811 is available in a 10-lead MSOP pack-
age as well as a small 10-lead SON package.
V
DD
V
REF
R
DAC7811
12-Bit
R-2R DAC
R
FB
I
OUT
1
I
OUT
2
APPLICATIONS
Portable Battery-Powered Instruments
Waveform Generators
Analog Processing
Programmable Amplifiers and Attenuators
Digitally Controlled Calibration
Programmable Filters and Oscillators
Composite Video
Ultrasound
DAC Register
Power-On
Reset
Input Latch
SYNC
SCLK
SDIN
Control Logic and
Input Shift Register
SDO
GND
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.
SPI is a trademark of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor.
All trademarks are the property of their respective owners.
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 漏 2005, Texas Instruments Incorporated
PRODUCT PREVIEW