Dual 12-Bit, High Bandwidth, Multiplying DAC
with 4-Quadrant Resistors and Serial Interface
AD5415
FEATURES
On-chip 4-quadrant resistors allow flexible output ranges
10 MHz multiplying bandwidth
50 MHz serial interface
2.5 V to 5.5 V supply operation
±10 V reference input
Extended temperature range: −40°C to +125°C
24-lead TSSOP package
Guaranteed monotonic
Power-on reset
Daisy-chain mode
Readback function
0.5 µA typical current consumption
GENERAL DESCRIPTION
The AD5415
1
is a CMOS 12-bit, dual-channel, current output
digital-to-analog converter. This device operates from a 2.5 V to
5.5 V power supply, making it suited to battery-powered appli-
cations as well as many other applications.
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. In addition, this device contains all the
4-quadrant resistors necessary for bipolar operation and other
configuration modes.
This DAC utilizes a double-buffered 3-wire serial interface that
is compatible with SPI®, QSPI™, MICROWIRE™, 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 zeros, and the DAC outputs
are at zero scale. As a result of manufacture on a CMOS submi-
cron process, this part offers excellent 4-quadrant multiplication
characteristics, with large-signal multiplying bandwidths of
10 MHz.
1
APPLICATIONS
Portable battery-powered applications
Waveform generators
Analog processing
Instrumentation applications
Programmable amplifiers and attenuators
Digitally controlled calibration
Programmable filters and oscillators
Composite video
Ultrasound
Gain, offset, and voltage trimming
US Patent Number 5,689,257.
FUNCTIONAL BLOCK DIAGRAM
R3A
R2_3A
R3
2R
R2
2R
R2A
V
REF
A R1A
R1
2R
R
FB
2R
R
FB
A
INPUT
REGISTER
DAC
REGISTER
12-BIT
R-2R DAC A
I
OUT
1A
I
OUT
2A
V
DD
SYNC
SCLK
SDIN
SDO
LDAC
AD5415
SHIFT
REGISTER
INPUT
REGISTER
CLR
GND
POWER-ON
RESET
DAC
REGISTER
12-BIT
R-2R DAC B
I
OUT
1B
I
OUT
2B
R
FB
B
04461-0-001
R3
2R
R3B
R2_3B
R2
2R
R2B
R1
2R
V
REF
B R1B
R
FB
2R
Figure 1.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
© 2004 Analog Devices, Inc. All rights reserved.
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